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Android的PackageManager和ActivityManager的功能简介

2013年09月07日 ⁄ 综合 ⁄ 共 42112字 ⁄ 字号 评论关闭

PackageManager相关 本类API是对所有基于加载信息的数据结构的封装,包括以下功能: 安装,卸载应用 查询permission相关信息 查询Application相关信息(application,activity,receiver,service,provider及相应属性等) 查询已安装应用 增加,删除permission 清除用户数据、缓存,代码段等 非查询相关的API需要特定的权限,具体的API请参考SDK文档。 ActivityManager相关 本类API是对运行时管理功能和运行时数据结构的封装,包括以下功能 激活/去激活activity 注册/取消注册动态接受intent 发送/取消发送intent activity生命周期管理(暂停,恢复,停止,销毁等) activity task管理(前台->后台,后台->前台,最近task查询,运行时task查询) 激活/去激活service 激活/去激活provider等 task管理相关API需要特定的权限,具体API可参考SDK文档。 本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/wufenglong/archive/2010/08/22/5829526.aspx

 

 

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.content.pm;

import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentSender;
import android.content.res.Resources;
import android.content.res.XmlResourceParser;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Environment;
import android.os.StatFs;
import android.util.AndroidException;
import android.util.DisplayMetrics;

import java.io.File;
import java.util.List;

/**
 * Class for retrieving various kinds of information related to the application
 * packages that are currently installed on the device.
 *
 * You can find this class through {@link Context#getPackageManager}.
 */
public abstract class PackageManager {

    /**
     * This exception is thrown when a given package, application, or component
     * name can not be found.
     */
    public static class NameNotFoundException extends AndroidException {
        public NameNotFoundException() {
        }

        public NameNotFoundException(String name) {
            super(name);
        }
    }

    /**
     * {@link PackageInfo} flag: return information about
     * activities in the package in {@link PackageInfo#activities}.
     */
    public static final int GET_ACTIVITIES              = 0x00000001;

    /**
     * {@link PackageInfo} flag: return information about
     * intent receivers in the package in
     * {@link PackageInfo#receivers}.
     */
    public static final int GET_RECEIVERS               = 0x00000002;

    /**
     * {@link PackageInfo} flag: return information about
     * services in the package in {@link PackageInfo#services}.
     */
    public static final int GET_SERVICES                = 0x00000004;

    /**
     * {@link PackageInfo} flag: return information about
     * content providers in the package in
     * {@link PackageInfo#providers}.
     */
    public static final int GET_PROVIDERS               = 0x00000008;

    /**
     * {@link PackageInfo} flag: return information about
     * instrumentation in the package in
     * {@link PackageInfo#instrumentation}.
     */
    public static final int GET_INSTRUMENTATION         = 0x00000010;

    /**
     * {@link PackageInfo} flag: return information about the
     * intent filters supported by the activity.
     */
    public static final int GET_INTENT_FILTERS          = 0x00000020;

    /**
     * {@link PackageInfo} flag: return information about the
     * signatures included in the package.
     */
    public static final int GET_SIGNATURES          = 0x00000040;

    /**
     * {@link ResolveInfo} flag: return the IntentFilter that
     * was matched for a particular ResolveInfo in
     * {@link ResolveInfo#filter}.
     */
    public static final int GET_RESOLVED_FILTER         = 0x00000040;

    /**
     * {@link ComponentInfo} flag: return the {@link ComponentInfo#metaData}
     * data {@link android.os.Bundle}s that are associated with a component.
     * This applies for any API returning a ComponentInfo subclass.
     */
    public static final int GET_META_DATA               = 0x00000080;

    /**
     * {@link PackageInfo} flag: return the
     * {@link PackageInfo#gids group ids} that are associated with an
     * application.
     * This applies for any API returning an PackageInfo class, either
     * directly or nested inside of another.
     */
    public static final int GET_GIDS                    = 0x00000100;

    /**
     * {@link PackageInfo} flag: include disabled components in the returned info.
     */
    public static final int GET_DISABLED_COMPONENTS     = 0x00000200;

    /**
     * {@link ApplicationInfo} flag: return the
     * {@link ApplicationInfo#sharedLibraryFiles paths to the shared libraries}
     * that are associated with an application.
     * This applies for any API returning an ApplicationInfo class, either
     * directly or nested inside of another.
     */
    public static final int GET_SHARED_LIBRARY_FILES    = 0x00000400;

    /**
     * {@link ProviderInfo} flag: return the
     * {@link ProviderInfo#uriPermissionPatterns URI permission patterns}
     * that are associated with a content provider.
     * This applies for any API returning an ProviderInfo class, either
     * directly or nested inside of another.
     */
    public static final int GET_URI_PERMISSION_PATTERNS  = 0x00000800;
    /**
     * {@link PackageInfo} flag: return information about
     * permissions in the package in
     * {@link PackageInfo#permissions}.
     */
    public static final int GET_PERMISSIONS               = 0x00001000;
   
    /**
     * Flag parameter to retrieve all applications(even uninstalled ones) with data directories.
     * This state could have resulted if applications have been deleted with flag
     * DONT_DELETE_DATA
     * with a possibility of being replaced or reinstalled in future
     */
    public static final int GET_UNINSTALLED_PACKAGES = 0x00002000;
   
    /**
     * {@link PackageInfo} flag: return information about
     * hardware preferences in
     * {@link PackageInfo#configPreferences PackageInfo.configPreferences} and
     * requested features in {@link PackageInfo#reqFeatures
     * PackageInfo.reqFeatures}.
     */
    public static final int GET_CONFIGURATIONS = 0x00004000;

    /**
     * Resolution and querying flag: if set, only filters that support the
     * {@link android.content.Intent#CATEGORY_DEFAULT} will be considered for
     * matching.  This is a synonym for including the CATEGORY_DEFAULT in your
     * supplied Intent.
     */
    public static final int MATCH_DEFAULT_ONLY   = 0x00010000;

    /**
     * Permission check result: this is returned by {@link #checkPermission}
     * if the permission has been granted to the given package.
     */
    public static final int PERMISSION_GRANTED = 0;

    /**
     * Permission check result: this is returned by {@link #checkPermission}
     * if the permission has not been granted to the given package.
     */
    public static final int PERMISSION_DENIED = -1;

    /**
     * Signature check result: this is returned by {@link #checkSignatures}
     * if the two packages have a matching signature.
     */
    public static final int SIGNATURE_MATCH = 0;

    /**
     * Signature check result: this is returned by {@link #checkSignatures}
     * if neither of the two packages is signed.
     */
    public static final int SIGNATURE_NEITHER_SIGNED = 1;

    /**
     * Signature check result: this is returned by {@link #checkSignatures}
     * if the first package is not signed, but the second is.
     */
    public static final int SIGNATURE_FIRST_NOT_SIGNED = -1;

    /**
     * Signature check result: this is returned by {@link #checkSignatures}
     * if the second package is not signed, but the first is.
     */
    public static final int SIGNATURE_SECOND_NOT_SIGNED = -2;

    /**
     * Signature check result: this is returned by {@link #checkSignatures}
     * if both packages are signed but there is no matching signature.
     */
    public static final int SIGNATURE_NO_MATCH = -3;

    /**
     * Signature check result: this is returned by {@link #checkSignatures}
     * if either of the given package names are not valid.
     */
    public static final int SIGNATURE_UNKNOWN_PACKAGE = -4;

    public static final int COMPONENT_ENABLED_STATE_DEFAULT = 0;
    public static final int COMPONENT_ENABLED_STATE_ENABLED = 1;
    public static final int COMPONENT_ENABLED_STATE_DISABLED = 2;

    /**
     * Flag parameter for {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} to
     * indicate that this package should be installed as forward locked, i.e. only the app itself
     * should have access to its code and non-resource assets.
     * @hide
     */
    public static final int INSTALL_FORWARD_LOCK = 0x00000001;

    /**
     * Flag parameter for {@link #installPackage} to indicate that you want to replace an already
     * installed package, if one exists.
     * @hide
     */
    public static final int INSTALL_REPLACE_EXISTING = 0x00000002;

    /**
     * Flag parameter for {@link #installPackage} to indicate that you want to
     * allow test packages (those that have set android:testOnly in their
     * manifest) to be installed.
     * @hide
     */
    public static final int INSTALL_ALLOW_TEST = 0x00000004;

    /**
     * Flag parameter for {@link #installPackage} to indicate that this
     * package has to be installed on the sdcard.
     * @hide
     */
    public static final int INSTALL_EXTERNAL = 0x00000008;

    /**
    * Flag parameter for {@link #installPackage} to indicate that this
    * package has to be installed on the sdcard.
    * @hide
    */
   public static final int INSTALL_INTERNAL = 0x00000010;

    /**
     * Flag parameter for
     * {@link #setComponentEnabledSetting(android.content.ComponentName, int, int)} to indicate
     * that you don't want to kill the app containing the component.  Be careful when you set this
     * since changing component states can make the containing application's behavior unpredictable.
     */
    public static final int DONT_KILL_APP = 0x00000001;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} on success.
     * @hide
     */
    public static final int INSTALL_SUCCEEDED = 1;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if the package is
     * already installed.
     * @hide
     */
    public static final int INSTALL_FAILED_ALREADY_EXISTS = -1;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if the package archive
     * file is invalid.
     * @hide
     */
    public static final int INSTALL_FAILED_INVALID_APK = -2;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if the URI passed in
     * is invalid.
     * @hide
     */
    public static final int INSTALL_FAILED_INVALID_URI = -3;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if the package manager
     * service found that the device didn't have enough storage space to install the app.
     * @hide
     */
    public static final int INSTALL_FAILED_INSUFFICIENT_STORAGE = -4;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if a
     * package is already installed with the same name.
     * @hide
     */
    public static final int INSTALL_FAILED_DUPLICATE_PACKAGE = -5;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the requested shared user does not exist.
     * @hide
     */
    public static final int INSTALL_FAILED_NO_SHARED_USER = -6;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * a previously installed package of the same name has a different signature
     * than the new package (and the old package's data was not removed).
     * @hide
     */
    public static final int INSTALL_FAILED_UPDATE_INCOMPATIBLE = -7;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package is requested a shared user which is already installed on the
     * device and does not have matching signature.
     * @hide
     */
    public static final int INSTALL_FAILED_SHARED_USER_INCOMPATIBLE = -8;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package uses a shared library that is not available.
     * @hide
     */
    public static final int INSTALL_FAILED_MISSING_SHARED_LIBRARY = -9;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package uses a shared library that is not available.
     * @hide
     */
    public static final int INSTALL_FAILED_REPLACE_COULDNT_DELETE = -10;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package failed while optimizing and validating its dex files,
     * either because there was not enough storage or the validation failed.
     * @hide
     */
    public static final int INSTALL_FAILED_DEXOPT = -11;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package failed because the current SDK version is older than
     * that required by the package.
     * @hide
     */
    public static final int INSTALL_FAILED_OLDER_SDK = -12;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package failed because it contains a content provider with the
     * same authority as a provider already installed in the system.
     * @hide
     */
    public static final int INSTALL_FAILED_CONFLICTING_PROVIDER = -13;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package failed because the current SDK version is newer than
     * that required by the package.
     * @hide
     */
    public static final int INSTALL_FAILED_NEWER_SDK = -14;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package failed because it has specified that it is a test-only
     * package and the caller has not supplied the {@link #INSTALL_ALLOW_TEST}
     * flag.
     * @hide
     */
    public static final int INSTALL_FAILED_TEST_ONLY = -15;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the package being installed contains native code, but none that is
     * compatible with the the device's CPU_ABI.
     * @hide
     */
    public static final int INSTALL_FAILED_CPU_ABI_INCOMPATIBLE = -16;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package uses a feature that is not available.
     * @hide
     */
    public static final int INSTALL_FAILED_MISSING_FEATURE = -17;

    // ------ Errors related to sdcard
    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * a secure container mount point couldn't be accessed on external media.
     * @hide
     */
    public static final int INSTALL_FAILED_CONTAINER_ERROR = -18;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package couldn't be installed in the specified install
     * location.
     * @hide
     */
    public static final int INSTALL_FAILED_INVALID_INSTALL_LOCATION = -19;

    /**
     * Installation return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
     * the new package couldn't be installed in the specified install
     * location because the media is not available.
     * @hide
     */
    public static final int INSTALL_FAILED_MEDIA_UNAVAILABLE = -20;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser was given a path that is not a file, or does not end with the expected
     * '.apk' extension.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_NOT_APK = -100;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser was unable to retrieve the AndroidManifest.xml file.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_BAD_MANIFEST = -101;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser encountered an unexpected exception.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION = -102;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser did not find any certificates in the .apk.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_NO_CERTIFICATES = -103;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser found inconsistent certificates on the files in the .apk.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES = -104;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser encountered a CertificateEncodingException in one of the
     * files in the .apk.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_CERTIFICATE_ENCODING = -105;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser encountered a bad or missing package name in the manifest.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME = -106;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser encountered a bad shared user id name in the manifest.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_BAD_SHARED_USER_ID = -107;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser encountered some structural problem in the manifest.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_MANIFEST_MALFORMED = -108;

    /**
     * Installation parse return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the parser did not find any actionable tags (instrumentation or application)
     * in the manifest.
     * @hide
     */
    public static final int INSTALL_PARSE_FAILED_MANIFEST_EMPTY = -109;

    /**
     * Installation failed return code: this is passed to the {@link IPackageInstallObserver} by
     * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)}
     * if the system failed to install the package because of system issues.
     * @hide
     */
    public static final int INSTALL_FAILED_INTERNAL_ERROR = -110;

    /**
     * Flag parameter for {@link #deletePackage} to indicate that you don't want to delete the
     * package's data directory.
     *
     * @hide
     */
    public static final int DONT_DELETE_DATA = 0x00000001;

    /**
     * Return code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * when the package has been successfully moved by the system.
     * @hide
     */
    public static final int MOVE_SUCCEEDED = 1;
    /**
     * Error code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * when the package hasn't been successfully moved by the system
     * because of insufficient memory on specified media.
     * @hide
     */
    public static final int MOVE_FAILED_INSUFFICIENT_STORAGE = -1;

    /**
     * Error code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * if the specified package doesn't exist.
     * @hide
     */
    public static final int MOVE_FAILED_DOESNT_EXIST = -2;

    /**
     * Error code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * if the specified package cannot be moved since its a system package.
     * @hide
     */
    public static final int MOVE_FAILED_SYSTEM_PACKAGE = -3;

    /**
     * Error code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * if the specified package cannot be moved since its forward locked.
     * @hide
     */
    public static final int MOVE_FAILED_FORWARD_LOCKED = -4;

    /**
     * Error code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * if the specified package cannot be moved to the specified location.
     * @hide
     */
    public static final int MOVE_FAILED_INVALID_LOCATION = -5;

    /**
     * Error code that is passed to the {@link IPackageMoveObserver} by
     * {@link #movePackage(android.net.Uri, IPackageMoveObserver)}
     * if the specified package cannot be moved to the specified location.
     * @hide
     */
    public static final int MOVE_FAILED_INTERNAL_ERROR = -6;

    /**
     * Flag parameter for {@link #movePackage} to indicate that
     * the package should be moved to internal storage if its
     * been installed on external media.
     * @hide
     */
    public static final int MOVE_INTERNAL = 0x00000001;

    /**
     * Flag parameter for {@link #movePackage} to indicate that
     * the package should be moved to external media.
     * @hide
     */
    public static final int MOVE_EXTERNAL_MEDIA = 0x00000002;

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device is capable of communicating with
     * other devices via Bluetooth.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_BLUETOOTH = "android.hardware.bluetooth";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device has a camera facing away
     * from the screen.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_CAMERA = "android.hardware.camera";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device's camera supports auto-focus.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_CAMERA_AUTOFOCUS = "android.hardware.camera.autofocus";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device's camera supports flash.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_CAMERA_FLASH = "android.hardware.camera.flash";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device supports one or more methods of
     * reporting current location.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_LOCATION = "android.hardware.location";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device has a Global Positioning System
     * receiver and can report precise location.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_LOCATION_GPS = "android.hardware.location.gps";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device can report location with coarse
     * accuracy using a network-based geolocation system.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_LOCATION_NETWORK = "android.hardware.location.network";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device can record audio via a
     * microphone.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_MICROPHONE = "android.hardware.microphone";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device includes a magnetometer (compass).
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_SENSOR_COMPASS = "android.hardware.sensor.compass";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device includes an accelerometer.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_SENSOR_ACCELEROMETER = "android.hardware.sensor.accelerometer";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device includes a light sensor.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_SENSOR_LIGHT = "android.hardware.sensor.light";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device includes a proximity sensor.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_SENSOR_PROXIMITY = "android.hardware.sensor.proximity";
   
    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device has a telephony radio with data
     * communication support.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_TELEPHONY = "android.hardware.telephony";
   
    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device has a CDMA telephony stack.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_TELEPHONY_CDMA = "android.hardware.telephony.cdma";
   
    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device has a GSM telephony stack.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_TELEPHONY_GSM = "android.hardware.telephony.gsm";
   
    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device's display has a touch screen.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_TOUCHSCREEN = "android.hardware.touchscreen";
   
   
    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device's touch screen supports
     * multitouch sufficient for basic two-finger gesture detection.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_TOUCHSCREEN_MULTITOUCH = "android.hardware.touchscreen.multitouch";
   
    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device's touch screen is capable of
     * tracking two or more fingers fully independently.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_TOUCHSCREEN_MULTITOUCH_DISTINCT = "android.hardware.touchscreen.multitouch.distinct";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device supports live wallpapers.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_LIVE_WALLPAPER = "android.software.live_wallpaper";

    /**
     * Feature for {@link #getSystemAvailableFeatures} and
     * {@link #hasSystemFeature}: The device supports WiFi (802.11) networking.
     */
    @SdkConstant(SdkConstantType.FEATURE)
    public static final String FEATURE_WIFI = "android.hardware.wifi";

    /**
     * Action to external storage service to clean out removed apps.
     * @hide
     */
    public static final String ACTION_CLEAN_EXTERNAL_STORAGE
            = "android.content.pm.CLEAN_EXTERNAL_STORAGE";

    /**
     * Retrieve overall information about an application package that is
     * installed on the system.
     *
     * <p>Throws {@link NameNotFoundException} if a package with the given
     * name can not be found on the system.
     *
     * @param packageName The full name (i.e. com.google.apps.contacts) of the
     *                    desired package.

     * @param flags Additional option flags. Use any combination of
     * {@link #GET_ACTIVITIES},
     * {@link #GET_GIDS},
     * {@link #GET_CONFIGURATIONS},
     * {@link #GET_INSTRUMENTATION},
     * {@link #GET_PERMISSIONS},
     * {@link #GET_PROVIDERS},
     * {@link #GET_RECEIVERS},
     * {@link #GET_SERVICES},
     * {@link #GET_SIGNATURES},
     * {@link #GET_UNINSTALLED_PACKAGES} to modify the data returned.
     *
     * @return Returns a PackageInfo object containing information about the package.
     *         If flag GET_UNINSTALLED_PACKAGES is set and  if the package is not
     *         found in the list of installed applications, the package information is
     *         retrieved from the list of uninstalled applications(which includes
     *         installed applications as well as applications
     *         with data directory ie applications which had been
     *         deleted with DONT_DELTE_DATA flag set).
     *        
     * @see #GET_ACTIVITIES
     * @see #GET_GIDS
     * @see #GET_CONFIGURATIONS
     * @see #GET_INSTRUMENTATION
     * @see #GET_PERMISSIONS
     * @see #GET_PROVIDERS
     * @see #GET_RECEIVERS
     * @see #GET_SERVICES
     * @see #GET_SIGNATURES
     * @see #GET_UNINSTALLED_PACKAGES
     *                 
     */
    public abstract PackageInfo getPackageInfo(String packageName, int flags)
            throws NameNotFoundException;

    /**
     * Map from the current package names in use on the device to whatever
     * the current canonical name of that package is.
     * @param names Array of current names to be mapped.
     * @return Returns an array of the same size as the original, containing
     * the canonical name for each package.
     */
    public abstract String[] currentToCanonicalPackageNames(String[] names);
   
    /**
     * Map from a packages canonical name to the current name in use on the device.
     * @param names Array of new names to be mapped.
     * @return Returns an array of the same size as the original, containing
     * the current name for each package.
     */
    public abstract String[] canonicalToCurrentPackageNames(String[] names);
   
    /**
     * Return a "good" intent to launch a front-door activity in a package,
     * for use for example to implement an "open" button when browsing through
     * packages.  The current implementation will look first for a main
     * activity in the category {@link Intent#CATEGORY_INFO}, next for a
     * main activity in the category {@link Intent#CATEGORY_LAUNCHER}, or return
     * null if neither are found.
     *
     * <p>Throws {@link NameNotFoundException} if a package with the given
     * name can not be found on the system.
     *
     * @param packageName The name of the package to inspect.
     *
     * @return Returns either a fully-qualified Intent that can be used to
     * launch the main activity in the package, or null if the package does
     * not contain such an activity.
     */
    public abstract Intent getLaunchIntentForPackage(String packageName);

    /**
     * Return an array of all of the secondary group-ids that have been
     * assigned to a package.
     *
     * <p>Throws {@link NameNotFoundException} if a package with the given
     * name can not be found on the system.
     *
     * @param packageName The full name (i.e. com.google.apps.contacts) of the
     *                    desired package.
     *
     * @return Returns an int array of the assigned gids, or null if there
     * are none.
     */
    public abstract int[] getPackageGids(String packageName)
            throws NameNotFoundException;

    /**
     * Retrieve all of the information we know about a particular permission.
     *
     * <p>Throws {@link NameNotFoundException} if a permission with the given
     * name can not be found on the system.
     *
     * @param name The fully qualified name (i.e. com.google.permission.LOGIN)
     *             of the permission you are interested in.
     * @param flags Additional option flags.  Use {@link #GET_META_DATA} to
     * retrieve any meta-data associated with the permission.
     *
     * @return Returns a {@link PermissionInfo} containing information about the
     *         permission.
     */
    public abstract PermissionInfo getPermissionInfo(String name, int flags)
            throws NameNotFoundException;

    /**
     * Query for all of the permissions associated with a particular group.
     *
     * <p>Throws {@link NameNotFoundException} if the given group does not
     * exist.
     *
     * @param group The fully qualified name (i.e. com.google.permission.LOGIN)
     *             of the permission group you are interested in.  Use null to
     *             find all of the permissions not associated with a group.
     * @param flags Additional option flags.  Use {@link #GET_META_DATA} to
     * retrieve any meta-data associated with the permissions.
     *
     * @return Returns a list of {@link PermissionInfo} containing information
     * about all of the permissions in the given group.
     */
    public abstract List<PermissionInfo> queryPermissionsByGroup(String group,
            int flags) throws NameNotFoundException;

    /**
     * Retrieve all of the information we know about a particular group of
     * permissions.
     *
     * <p>Throws {@link NameNotFoundException} if a permission group with the given
     * name can not be found on the system.
     *
     * @param name The fully qualified name (i.e. com.google.permission_group.APPS)
     *             of the permission you are interested in.
     * @param flags Additional option flags.  Use {@link #GET_META_DATA} to
     * retrieve any meta-data associated with the permission group.
     *
     * @return Returns a {@link PermissionGroupInfo} containing information
     * about the permission.
     */
    public abstract PermissionGroupInfo getPermissionGroupInfo(String name,
            int flags) throws NameNotFoundException;

    /**
     * Retrieve all of the known permission groups in the system.
     *
     * @param flags Additional option flags.  Use {@link #GET_META_DATA} to
     * retrieve any meta-data associated with the permission group.
     *
     * @return Returns a list of {@link PermissionGroupInfo} containing
     * information about all of the known permission groups.
     */
    public abstract List<PermissionGroupInfo> getAllPermissionGroups(int flags);

    /**
     * Retrieve all of the information we know about a particular
     * package/application.
     *
     * <p>Throws {@link NameNotFoundException} if an application with the given
     * package name can not be found on the system.
     *
     * @param packageName The full name (i.e. com.google.apps.contacts) of an
     *                    application.
     * @param flags Additional option flags. Use any combination of
     * {@link #GET_META_DATA}, {@link #GET_SHARED_LIBRARY_FILES},
     * {@link #GET_UNINSTALLED_PACKAGES} to modify the data returned.
     *
     * @return  {@link ApplicationInfo} Returns ApplicationInfo object containing
     *         information about the package.
     *         If flag GET_UNINSTALLED_PACKAGES is set and  if the package is not
     *         found in the list of installed applications,
     *         the application information is retrieved from the
     *         list of uninstalled applications(which includes
     *         installed applications as well as applications
     *         with data directory ie applications which had been
     *         deleted with DONT_DELTE_DATA flag set).
     *
     * @see #GET_META_DATA
     * @see #GET_SHARED_LIBRARY_FILES
     * @see #GET_UNINSTALLED_PACKAGES
     */
    public abstract ApplicationInfo getApplicationInfo(String packageName,
            int flags) throws NameNotFoundException;

    /**
     * Retrieve all of the information we know about a particular activity
     * class.
     *
     * <p>Throws {@link NameNotFoundException} if an activity with the given
     * class name can not be found on the system.
     *
     * @param className The full name (i.e.
     *                  com.google.apps.contacts.ContactsList) of an Activity
     *                  class.
     * @param flags Additional option flags. Use any combination of
     * {@link #GET_META_DATA}, {@link #GET_SHARED_LIBRARY_FILES},
     * to modify the data (in ApplicationInfo) returned.
     *
     * @return {@link ActivityInfo} containing information about the activity.
     *
     * @see #GET_INTENT_FILTERS
     * @see #GET_META_DATA
     * @see #GET_SHARED_LIBRARY_FILES
     */
    public abstract ActivityInfo getActivityInfo(ComponentName className,
            int flags) throws NameNotFoundException;

    /**
     * Retrieve all of the information we know about a particular receiver
     * class.
     *
     * <p>Throws {@link NameNotFoundException} if a receiver with the given
     * class name can not be found on the system.
     *
     * @param className The full name (i.e.
     *                  com.google.apps.contacts.CalendarAlarm) of a Receiver
     *                  class.
     * @param flags Additional option flags.  Use any combination of
     * {@link #GET_META_DATA}, {@link #GET_SHARED_LIBRARY_FILES},
     * to modify the data returned.
     *
     * @return {@link ActivityInfo} containing information about the receiver.
     *
     * @see #GET_INTENT_FILTERS
     * @see #GET_META_DATA
     * @see #GET_SHARED_LIBRARY_FILES
     */
    public abstract ActivityInfo getReceiverInfo(ComponentName className,
            int flags) throws NameNotFoundException;

    /**
     * Retrieve all of the information we know about a particular service
     * class.
     *
     * <p>Throws {@link NameNotFoundException} if a service with the given
     * class name can not be found on the system.
     *
     * @param className The full name (i.e.
     *                  com.google.apps.media.BackgroundPlayback) of a Service
     *                  class.
     * @param flags Additional option flags.  Use any combination of
     * {@link #GET_META_DATA}, {@link #GET_SHARED_LIBRARY_FILES},
     * to modify the data returned.
     *
     * @return ServiceInfo containing information about the service.
     *
     * @see #GET_META_DATA
     * @see #GET_SHARED_LIBRARY_FILES
     */
    public abstract ServiceInfo getServiceInfo(ComponentName className,
            int flags) throws NameNotFoundException;

    /**
     * Return a List of all packages that are installed
     * on the device.
     *
     * @param flags Additional option flags. Use any combination of
     * {@link #GET_ACTIVITIES},
     * {@link #GET_GIDS},
     * {@link #GET_CONFIGURATIONS},
     * {@link #GET_INSTRUMENTATION},
     * {@link #GET_PERMISSIONS},
     * {@link #GET_PROVIDERS},
     * {@link #GET_RECEIVERS},
     * {@link #GET_SERVICES},
     * {@link #GET_SIGNATURES},
     * {@link #GET_UNINSTALLED_PACKAGES} to modify the data returned.
     *
     * @return A List of PackageInfo objects, one for each package that is
     *         installed on the device.  In the unlikely case of there being no
     *         installed packages, an empty list is returned.
     *         If flag GET_UNINSTALLED_PACKAGES is set, a list of all
     *         applications including those deleted with DONT_DELETE_DATA
     *         (partially installed apps with data directory) will be returned.
     *
     * @see #GET_ACTIVITIES
     * @see #GET_GIDS
     * @see #GET_CONFIGURATIONS
     * @see #GET_INSTRUMENTATION
     * @see #GET_PERMISSIONS
     * @see #GET_PROVIDERS
     * @see #GET_RECEIVERS
     * @see #GET_SERVICES
     * @see #GET_SIGNATURES
     * @see #GET_UNINSTALLED_PACKAGES
     *
     */
    public abstract List<PackageInfo> getInstalledPackages(int flags);

    /**
     * Check whether a particular package has been granted a particular
     * permission.
     *
     * @param permName The name of the permission you are checking for,
     * @param pkgName The name of the package you are checking against.
     *
     * @return If the package has the permission, PERMISSION_GRANTED is
     * returned.  If it does not have the permission, PERMISSION_DENIED
     * is returned.
     *
     * @see #PERMISSION_GRANTED
     * @see #PERMISSION_DENIED
     */
    public abstract int checkPermission(String permName, String pkgName);

    /**
     * Add a new dynamic permission to the system.  For this to work, your
     * package must have defined a permission tree through the
     * {@link android.R.styleable#AndroidManifestPermissionTree
     * &lt;permission-tree&gt;} tag in its manifest.  A package can only add
     * permissions to trees that were defined by either its own package or
     * another with the same user id; a permission is in a tree if it
     * matches the name of the permission tree + ".": for example,
     * "com.foo.bar" is a member of the permission tree "com.foo".
     *
     * <p>It is good to make your permission tree name descriptive, because you
     * are taking possession of that entire set of permission names.  Thus, it
     * must be under a domain you control, with a suffix that will not match
     * any normal permissions that may be declared in any applications that
     * are part of that domain.
     *
     * <p>New permissions must be added before
     * any .apks are installed that use those permissions.  Permissions you
     * add through this method are remembered across reboots of the device.
     * If the given permission already exists, the info you supply here
     * will be used to update it.
     *
     * @param info Description of the permission to be added.
     *
     * @return Returns true if a new permission was created, false if an
     * existing one was updated.
     *
     * @throws SecurityException if you are not allowed to add the
     * given permission name.
     *
     * @see #removePermission(String)
     */
    public abstract boolean addPermission(PermissionInfo info);

    /**
     * Like {@link #addPermission(PermissionInfo)} but asynchronously
     * persists the package manager state after returning from the call,
     * allowing it to return quicker and batch a series of adds at the
     * expense of no guarantee the added permission will be retained if
     * the device is rebooted before it is written.
     */
    public abstract boolean addPermissionAsync(PermissionInfo info);
   
    /**
     * Removes a permission that was previously added with
     * {@link #addPermission(PermissionInfo)}.  The same ownership rules apply
     * -- you are only allowed to remove permissions that you are allowed
     * to add.
     *
     * @param name The name of the permission to remove.
     *
     * @throws SecurityException if you are not allowed to remove the
     * given permission name.
     *
     * @see #addPermission(PermissionInfo)
     */
    public abstract void removePermission(String name);

    /**
     * Compare the signatures of two packages to determine if the same
     * signature appears in both of them.  If they do contain the same
     * signature, then they are allowed special privileges when working
     * with each other: they can share the same user-id, run instrumentation
     * against each other, etc.
     *
     * @param pkg1 First package name whose signature will be compared.
     * @param pkg2 Second package name whose signature will be compared.
     * @return Returns an integer indicating whether there is a matching
     * signature: the value is >= 0 if there is a match (or neither package
     * is signed), or < 0 if there is not a match.  The match result can be
     * further distinguished with the success (>= 0) constants
     * {@link #SIGNATURE_MATCH}, {@link #SIGNATURE_NEITHER_SIGNED}; or
     * failure (< 0) constants {@link #SIGNATURE_FIRST_NOT_SIGNED},
     * {@link #SIGNATURE_SECOND_NOT_SIGNED}, {@link #SIGNATURE_NO_MATCH},
     * or {@link #SIGNATURE_UNKNOWN_PACKAGE}.
     *
     * @see #checkSignatures(int, int)
     * @see #SIGNATURE_MATCH
     * @see #SIGNATURE_NEITHER_SIGNED
     * @see #SIGNATURE_FIRST_NOT_SIGNED
     * @see #SIGNATURE_SECOND_NOT_SIGNED
     * @see #SIGNATURE_NO_MATCH
     * @see #SIGNATURE_UNKNOWN_PACKAGE
     */
    public abstract int checkSignatures(String pkg1, String pkg2);

    /**
     * Like {@link #checkSignatures(String, String)}, but takes UIDs of
     * the two packages to be checked.  This can be useful, for example,
     * when doing the check in an IPC, where the UID is the only identity
     * available.  It is functionally identical to determining the package
     * associated with the UIDs and checking their signatures.
     *
     * @param uid1 First UID whose signature will be compared.
     * @param uid2 Second UID whose signature will be compared.
     * @return Returns an integer indicating whether there is a matching
     * signature: the value is >= 0 if there is a match (or neither package
     * is signed), or < 0 if there is not a match.  The match result can be
     * further distinguished with the success (>= 0) constants
     * {@link #SIGNATURE_MATCH}, {@link #SIGNATURE_NEITHER_SIGNED}; or
     * failure (< 0) constants {@link #SIGNATURE_FIRST_NOT_SIGNED},
     * {@link #SIGNATURE_SECOND_NOT_SIGNED}, {@link #SIGNATURE_NO_MATCH},
     * or {@link #SIGNATURE_UNKNOWN_PACKAGE}.
     *
     * @see #checkSignatures(int, int)
     * @see #SIGNATURE_MATCH
     * @see #SIGNATURE_NEITHER_SIGNED
     * @see #SIGNATURE_FIRST_NOT_SIGNED
     * @see #SIGNATURE_SECOND_NOT_SIGNED
     * @see #SIGNATURE_NO_MATCH
     * @see #SIGNATURE_UNKNOWN_PACKAGE
     */
  

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