学步园

import android.app.Activity; 

import android.content.Intent;

 import android.net.Uri;  

import android.net.Uri.Builder; 

import java.io.File; 

 import android.content.Intent; 

   //自定义android Intent类，  //可用于获取打开以下文件的intent  //PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO    示例:  //这个不行，可能是因为PDF.apk程序没有权限访问其它APK里的asset资源文件,又或者是路径写错?  //Intent it = getPdfFileIntent("file:///android_asset/helphelp.pdf"); //下面这些都OK  //Intent it = getHtmlFileIntent("/mnt/sdcard/tutorial.html");//SD卡主目录  //Intent it = getHtmlFileIntent("/sdcard/tutorial.html");//SD卡主目录,这样也可以  Intent it = getHtmlFileIntent("/system/etc/tutorial.html");//系统内部的etc目录 //Intent it = getPdfFileIntent("/system/etc/helphelp.pdf"); //Intent it = getWordFileIntent("/system/etc/help.doc");  //Intent it = getExcelFileIntent("/mnt/sdcard/Book1.xls")  //Intent it = getPptFileIntent("/mnt/sdcard/download/Android_PPT.ppt");//SD卡的download目录下  //Intent it = getVideoFileIntent("/mnt/sdcard/ice.avi"); //Intent it = getAudioFileIntent("/mnt/sdcard/ren.mp3");  //Intent it = getImageFileIntent("/mnt/sdcard/images/001041580.jpg"); //Intent it = getTextFileIntent("/mnt/sdcard/hello.txt",false);    startActivity( it );   public class MyIntent {     //android获取一个用于打开HTML文件的intent    public static Intent getHtmlFileIntent( String param )   {      Uri uri  =   - 2 -  Uri.parse(param ).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param ).build();      Intent intent = new Intent("android.intent.action.VIEW");     intent.setDataAndType(uri, "text/html");     return intent;   }    //android获取一个用于打开图片文件的intent    public static Intent getImageFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addCategory("android.intent.category.DEFAULT");     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     Uri uri = Uri.fromFile(new File(param ));     intent.setDataAndType(uri, "image/*");     return intent;    }      //android获取一个用于打开PDF文件的intent    public static Intent getPdfFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addCategory("android.intent.category.DEFAULT");     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     Uri uri = Uri.fromFile(new File(param ));     intent.setDataAndType(uri, "application/pdf");     return intent;    }    //android获取一个用于打开文本文件的intent   public static Intent getTextFileIntent( String param, boolean paramBoolean) {   Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  if (paramBoolean)  {  Uri uri1 = Uri.parse(param );  intent.setDataAndType(uri1, "text/plain");  }  else   {  Uri uri2 = Uri.fromFile(new File(param )); intent.setDataAndType(uri2, "text/plain");   - 3 -   }      return intent; }   //android获取一个用于打开音频文件的intent    public static Intent getAudioFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);     intent.putExtra("oneshot", 0);     intent.putExtra("configchange", 0);     Uri uri = Uri.fromFile(new File(param ));     intent.setDataAndType(uri, "audio/*");     return intent;   }       //android获取一个用于打开视频文件的intent    public static Intent getVideoFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);     intent.putExtra("oneshot", 0);      intent.putExtra("configchange", 0);      Uri uri = Uri.fromFile(new File(param ));     intent.setDataAndType(uri, "video/*");     return intent;    }      //android获取一个用于打开CHM文件的intent    public static Intent getChmFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addCategory("android.intent.category.DEFAULT");     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     Uri uri = Uri.fromFile(new File(param ));     intent.setDataAndType(uri, "application/x-chm");     return intent;   }     //android获取一个用于打开Word文件的intent    public static Intent getWordFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");   - 4 -      intent.addCategory("android.intent.category.DEFAULT");     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     Uri uri = Uri.fromFile(new File(param ));      intent.setDataAndType(uri, "application/msword");     return intent;   }    //android获取一个用于打开Excel文件的intent    public static Intent getExcelFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addCategory("android.intent.category.DEFAULT");     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     Uri uri = Uri.fromFile(new File(param ));      intent.setDataAndType(uri, "application/vnd.ms-excel");     return intent;    }     //android获取一个用于打开PPT文件的intent    public static Intent getPptFileIntent( String param )   {      Intent intent = new Intent("android.intent.action.VIEW");     intent.addCategory("android.intent.category.DEFAULT");     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     Uri uri = Uri.fromFile(new File(param ));      intent.setDataAndType(uri, "application/vnd.ms-powerpoint");     return intent;   } }   注意：  一定要在Manifest.xml中声明权限：  <!-- 在SDCard中创建与删除文件权限 -->   <uses-permission  android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />  <!-- 往SDCard写入数据权限 -->    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />