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Android 记住密码和自动登录界面的实现(SharedPreferences 的用法)

2017年12月15日 ⁄ 综合 ⁄ 共 9599字 ⁄ 字号 评论关闭

SharedPreferences介绍:

SharedPreferences是Android平台上一个轻量级的存储类,主要是保存一些常用的配置参数,它是采用xml文件存放数据的,文件存放在"/data/data<package name>/shared_prefs"目录下。

SharedPreferences的用法:

由于SharedPreferences是一个接口,而且在这个接口里没有提供写入数据和读取数据的能力。但它是通过其Editor接口中的一些方法来操作SharedPreference的,用法见下面代码:

Context.getSharedPreferences(String name,int mode)来得到一个SharedPreferences实例

name:是指文件名称,不需要加后缀.xml,系统会自动为我们添加上

mode:是指定读写方式,其值有三种,分别为:

Context.MODE_PRIVATE:指定该SharedPreferences数据只能被本应用程序读、写

Context.MODE_WORLD_READABLE指定该SharedPreferences数据能被其他应用程序读,但不能写

Context.MODE_WORLD_WRITEABLE指定该SharedPreferences数据能被其他应用程序读写


结果截图:







工程目录:

Java代码

LoginActivity.java

<span style="font-family:'Courier New';">package com.liu.activity;

import android.app.Activity;
import android.app.backup.SharedPreferencesBackupHelper;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.text.Spannable;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

public class LoginActivity extends Activity {
	
	private EditText userName, password;
	private CheckBox rem_pw, auto_login;
	private Button btn_login;
	private ImageButton btnQuit;
    private String userNameValue,passwordValue;
	private SharedPreferences sp;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		//去除标题
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.login);
		
        //获得实例对象
		sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE);
		userName = (EditText) findViewById(R.id.et_zh);
		password = (EditText) findViewById(R.id.et_mima);
        rem_pw = (CheckBox) findViewById(R.id.cb_mima);
		auto_login = (CheckBox) findViewById(R.id.cb_auto);
        btn_login = (Button) findViewById(R.id.btn_login);
        btnQuit = (ImageButton)findViewById(R.id.img_btn);
		
        
		//判断记住密码多选框的状态
      if(sp.getBoolean("ISCHECK", false))
        {
    	  //设置默认是记录密码状态
          rem_pw.setChecked(true);
       	  userName.setText(sp.getString("USER_NAME", ""));
       	  password.setText(sp.getString("PASSWORD", ""));
       	  //判断自动登陆多选框状态
       	  if(sp.getBoolean("AUTO_ISCHECK", false))
       	  {
       		     //设置默认是自动登录状态
       		     auto_login.setChecked(true);
       		    //跳转界面
				Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
				LoginActivity.this.startActivity(intent);
				
       	  }
        }
		
	    // 登录监听事件  现在默认为用户名为:liu 密码:123
		btn_login.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				userNameValue = userName.getText().toString();
			    passwordValue = password.getText().toString();
			    
				if(userNameValue.equals("liu")&&passwordValue.equals("123"))
				{
					Toast.makeText(LoginActivity.this,"登录成功", Toast.LENGTH_SHORT).show();
					//登录成功和记住密码框为选中状态才保存用户信息
					if(rem_pw.isChecked())
					{
					 //记住用户名、密码、
					  Editor editor = sp.edit();
					  editor.putString("USER_NAME", userNameValue);
					  editor.putString("PASSWORD",passwordValue);
					  editor.commit();
					}
					//跳转界面
					Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
					LoginActivity.this.startActivity(intent);
					//finish();
					
				}else{
					
					Toast.makeText(LoginActivity.this,"用户名或密码错误,请重新登录", Toast.LENGTH_LONG).show();
				}
				
			}
		});

	    //监听记住密码多选框按钮事件
		rem_pw.setOnCheckedChangeListener(new OnCheckedChangeListener() {
			public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
				if (rem_pw.isChecked()) {
                    
					System.out.println("记住密码已选中");
					sp.edit().putBoolean("ISCHECK", true).commit();
					
				}else {
					
					System.out.println("记住密码没有选中");
					sp.edit().putBoolean("ISCHECK", false).commit();
					
				}

			}
		});
		
		//监听自动登录多选框事件
		auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
				if (auto_login.isChecked()) {
					System.out.println("自动登录已选中");
					sp.edit().putBoolean("AUTO_ISCHECK", true).commit();

				} else {
					System.out.println("自动登录没有选中");
					sp.edit().putBoolean("AUTO_ISCHECK", false).commit();
				}
			}
		});
		
		btnQuit.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				finish();
			}
		});

	}
}</span>

LogoActivity.java

<span style="font-family:'Courier New';">package com.liu.activity;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.opengl.ETC1;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;

public class LogoActivity extends Activity {
	private ProgressBar progressBar;
	private Button backButton;

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 去除标题
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.logo);

		progressBar = (ProgressBar) findViewById(R.id.pgBar);
		backButton = (Button) findViewById(R.id.btn_back);

		Intent intent = new Intent(this, WelcomeAvtivity.class);
		LogoActivity.this.startActivity(intent);

		backButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				finish();

			}
		});

	}

}
</span>

WelcomeActivity.java

<span style="font-family:'Courier New';"><span style="BACKGROUND-COLOR: rgb(240,240,240); WHITE-SPACE: pre">package com.liu.activity;</span>
import android.app.Activity;
import android.os.Bundle;

public class WelcomeAvtivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.welcome);
	}

}</span>

布局文件:

login.xml文件

<span style="font-family:'Courier New';"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/logo_bg"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
        <ImageButton 
            android:id="@+id/img_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:background="@drawable/quit"/>

        <TextView
            android:id="@+id/tv_zh"
            android:layout_width="wrap_content"
            android:layout_height="35dip"
            android:layout_marginLeft="12dip"
            android:layout_marginTop="10dip"
            android:gravity="bottom"
            android:text="帐号:"
            android:textColor="#000000"
            android:textSize="18sp" />

        <EditText
            android:id="@+id/et_zh"
            android:layout_width="fill_parent"
            android:layout_height="40dip"
            android:layout_below="@id/tv_zh"
            android:layout_marginLeft="12dip"
            android:layout_marginRight="10dip" />

        <TextView
            android:id="@+id/tv_mima"
            android:layout_width="wrap_content"
            android:layout_height="35dip"
            android:layout_below="@id/et_zh"
            android:layout_marginLeft="12dip"
            android:layout_marginTop="10dip"
            android:gravity="bottom"
            android:text="密码:"
            android:textColor="#000000"
            android:textSize="18sp" />

        <EditText
            android:id="@+id/et_mima"
            android:layout_width="fill_parent"
            android:layout_height="40dip"
            android:layout_below="@id/tv_mima"
            android:layout_marginLeft="12dip"
            android:layout_marginRight="10dip"
            android:maxLines="200"
            android:password="true"
            android:scrollHorizontally="true" />

        <CheckBox
            android:id="@+id/cb_mima"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/et_mima"
            android:layout_marginLeft="12dip"
            android:text="记住密码"
            android:textColor="#000000" />

        <CheckBox
            android:id="@+id/cb_auto"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/cb_mima"
            android:layout_marginLeft="12dip"
            android:text="自动登录"
            android:textColor="#000000" />
        <Button
            android:id="@+id/btn_login"
            android:layout_width="80dip"
            android:layout_height="40dip"
            android:layout_below="@id/et_mima"
            android:layout_alignParentRight="true"
            android:layout_alignTop="@id/cb_auto"
            android:layout_marginRight="10dip"
            android:gravity="center"
            android:text="登录"
            android:textColor="#000000"
            android:textSize="18sp"/>

        
    </RelativeLayout>
    
    

</LinearLayout></span>

logo.xml文件

<span style="font-family:'Courier New';"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/logo_bg"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:layout_weight="3">

        <ProgressBar
            android:id="@+id/pgBar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true" />

        <TextView
            android:id="@+id/tv1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/pgBar"
            android:layout_centerHorizontal="true"
            android:text="正在登录..."
            android:textColor="#000000"
            android:textSize="18sp" />
    </RelativeLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <Button
            android:id="@+id/btn_back"
            android:layout_width="70dip"
            android:layout_height="35dip"
            android:text="取消"
            android:textColor="#000000"
            android:textSize="12sp" />
    </LinearLayout>


</LinearLayout></span>

welcome.xml

<span style="font-family:'Courier New';"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center"
    android:background="@drawable/login_bg"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="登陆成功,进入用户界面"
        android:textColor="#000000"
        android:textSize="20sp" />

</LinearLayout></span>

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