Android SharedPreferences实现记住密码和自动登录

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/bj" tools:context="com.example.application.MainActivity"> <ImageView  android:layout_marginTop="50dp"  android:layout_width="100dp"  android:layout_height="100dp"  android:src="@drawable/login_tx_1"  android:layout_gravity="center"  /> <FrameLayout  android:layout_width="match_parent"  android:layout_height="wrap_content">  <EditText   android:layout_width="300dp"   android:layout_height="wrap_content"   android:layout_gravity="center"   android:focusable="true"   android:focusableInTouchMode="true"   android:clickable="true"   android:hint="请输入账号"   android:gravity="center"   android:paddingRight="100dp"   android:id="@+id/login_uname"   />  <TextView   android:layout_width="38dp"   android:layout_height="33dp"   android:layout_marginLeft="30dp"   android:padding="6dp"   android:gravity="center"   android:drawableLeft="@drawable/uname"   /> </FrameLayout> <FrameLayout  android:layout_width="match_parent"  android:layout_height="wrap_content">  <EditText   android:layout_width="300dp"   android:layout_height="wrap_content"   android:layout_gravity="center"   android:focusable="true"   android:focusableInTouchMode="true"   android:clickable="true"   android:hint="请输入密码"   android:gravity="center"   android:paddingRight="100dp"   android:password="true"   android:id="@+id/login_upass"   />  <TextView   android:layout_width="38dp"   android:layout_height="33dp"   android:layout_marginLeft="30dp"   android:padding="6dp"   android:gravity="center"   android:drawableLeft="@drawable/upass"   /> </FrameLayout>   <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:gravity="center"  >  <CheckBox   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="记住密码"   android:id="@+id/login_auto"   />  <CheckBox   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_marginLeft="50dp"   android:text="自动登录"   android:id="@+id/login_btn"   /> </LinearLayout>  <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:gravity="center"  android:layout_margin="15dp"  >  <ImageButton   android:layout_width="40dp"   android:layout_height="40dp"   android:src="@drawable/login_qq"   />  <ImageButton   android:layout_width="40dp"   android:layout_height="40dp"   android:src="@drawable/login_weixin"   android:layout_marginLeft="60dp"   />  <ImageButton   android:layout_width="40dp"   android:layout_height="40dp"   android:src="@drawable/login_xinlan"   android:layout_marginLeft="60dp"   android:id="@+id/login_xinlan"   /> </LinearLayout>  <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="vertical">   <Button   android:layout_width="240dp"   android:layout_height="wrap_content"   android:layout_gravity="center"   android:background="@drawable/a_radio_button_selector_1"   android:gravity="center"   android:text="登录"   android:id="@+id/login_login"   />   <Button   android:layout_width="240dp"   android:layout_height="wrap_content"   android:layout_gravity="center"   android:layout_marginTop="20dp"   android:background="@drawable/a_radio_button_selector_1"   android:gravity="center"   android:text="忘记密码"   android:id="@+id/login_find"   />  <TextView   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_gravity="center"   android:layout_marginTop="20dp"   android:text="没有账号，立即注册"   android:textColor="#6efafa"   android:textSize="15dp"   android:onClick="JumpRegister"   /> </LinearLayout>  </LinearLayout>

package com.example.application;  import android.content.Intent;import android.content.SharedPreferences;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.Window;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.ImageButton;import android.widget.Toast;import com.sun.util.DBHelper; import java.util.HashMap; import cn.sharesdk.framework.Platform;import cn.sharesdk.framework.PlatformActionListener;import cn.sharesdk.framework.ShareSDK;import cn.sharesdk.sina.weibo.SinaWeibo;  public class MainActivity extends AppCompatActivity { public static String LoginUid=null; public static String LoginName=null; private Button login_login; private Button login_find; private EditText login_uname; private EditText login_upass; private CheckBox login_auto; private CheckBox login_btn; private SharedPreferences sp; private ImageButton login_xinlan; private Platform weibo; private DBHelper dbHelper; private SQLiteDatabase sqLiteDatabase; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  this.requestWindowFeature(Window.FEATURE_NO_TITLE);  setContentView(R.layout.activity_main);  //获取控件  login_uname = (EditText) findViewById(R.id.login_uname);  login_upass = (EditText) findViewById(R.id.login_upass);  login_auto = (CheckBox) findViewById(R.id.login_auto); //记住密码  login_btn = (CheckBox) findViewById(R.id.login_btn); //自动登录  login_login = (Button) findViewById(R.id.login_login); //登录  login_find = (Button) findViewById(R.id.login_find);  login_xinlan = (ImageButton) findViewById(R.id.login_xinlan);  //调用数据库  dbHelper = new DBHelper(this,"dtb.db",null,1);  sqLiteDatabase = dbHelper.getWritableDatabase();  //第三方登录  weibo = ShareSDK.getPlatform(SinaWeibo.NAME);  login_xinlan.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    //回调信息，可以在这里获取基本的授权返回的信息，但是注意如果做提示和UI操作要传到主线程handler里去执行    weibo.setPlatformActionListener(new PlatformActionListener      () {      @Override     public void onComplete(Platform platform, int i, HashMap<String, Object> hashMap) {      String openid = platform.getDb().getUserId();      String nickname = platform.getDb().getUserName();      Cursor cursor=sqLiteDatabase.rawQuery("select * from dtb_users where uname=?",new String[]{openid});      LoginUid=cursor.getString(cursor.getColumnIndex("uid"));      if(cursor.moveToNext()){       Log.i("test","已经注册过！");      }else{       sqLiteDatabase.execSQL("insert into dtb_users(uname,upass,name,levelnumber) values('"+openid+"','null','"+nickname+"','"+1+"')");      }      //跳转      MainActivity.LoginName=openid;      Intent intent=new Intent(MainActivity.this,MainMianActivity.class);      startActivity(intent);     }      @Override     public void onError(Platform arg0, int arg1, Throwable arg2) {      // TODO Auto-generated method stub      arg2.printStackTrace();     }      @Override     public void onCancel(Platform arg0, int arg1) {      // TODO Auto-generated method stub      }    });     //authorize与showUser单独调用一个即可    weibo.authorize();//单独授权,OnComplete返回的hashmap是空的    weibo.showUser(null);//授权并获取用户信息    //移除授权    // weibo.removeAccount(true);   }  });   //自动登录判断  sp = this.getSharedPreferences("userInfo",0);  String name=sp.getString("USER_NAME", "");  String pass =sp.getString("PASSWORD", "");  boolean choseRemember =sp.getBoolean("remember", false);  boolean choseAutoLogin =sp.getBoolean("autologin", false);  //如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码  if(choseRemember){   login_uname.setText(name);   login_upass.setText(pass);   login_auto.setChecked(true);  }  //如果上次登录选了自动登录，那进入登录页面也自动勾选自动登录  if(choseAutoLogin){   login_btn.setChecked(true);   Cursor cursor= sqLiteDatabase.rawQuery("select * from dtb_users where uname=? and upass=?",new String[]{name,pass});   if(cursor.moveToNext()){    new LoginThread().start();    LoginName=name;    LoginUid=cursor.getString(cursor.getColumnIndex("uid"));   }   }   // 登录监听事件 现在默认为用户名为：admin 密码：123  login_login.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    String userName=login_uname.getText().toString();    String userPass=login_upass.getText().toString();    SharedPreferences.Editor editor =sp.edit();    Cursor cursor= sqLiteDatabase.rawQuery("select * from dtb_users where uname=? and upass=?",new String[]{userName,userPass});    if(cursor.moveToNext()){//判断是否查询到此数据     Toast.makeText(MainActivity.this,"登录成功", Toast.LENGTH_SHORT).show();      LoginName=userName;     LoginUid=cursor.getString(cursor.getColumnIndex("uid"));     //是否记住密码     //记住用户名、密码、     editor.putString("USER_NAME", userName);     editor.putString("PASSWORD",userPass);     if(login_auto.isChecked()){      editor.putBoolean("remember", true);     }else{      editor.putBoolean("remember", false);     }     //是否自动登录     if(login_btn.isChecked()){      editor.putBoolean("autologin", true);     }else{      editor.putBoolean("autologin", false);     }      editor.commit();     //跳转界面     Intent intent = new Intent(MainActivity.this,MainMianActivity.class);     startActivity(intent);     Toast.makeText(MainActivity.this, "登录成功！", Toast.LENGTH_SHORT).show();     // finish();    }else{     Toast.makeText(MainActivity.this,"用户名或密码错误，请重新登录", Toast.LENGTH_LONG).show();    }   }  }); }   public void JumpRegister(View view){  Intent intent=new Intent(this,RegisterActivity.class);  startActivity(intent);  finish(); }  //子线程 控制自动睡眠2秒钟后自动登录 class LoginThread extends Thread{  @Override  public void run() {   try {    sleep(2000);    Intent intent = new Intent(MainActivity.this,MainMianActivity.class);    startActivity(intent);   } catch (InterruptedException e) {    e.printStackTrace();   }  } }  }