安卓登陆矿记住密码和自动登录的实现

 
1.在MainActivity.java文件中的Intent intent = new Intent();
intent.setClass(MainActivity.this,

SuccessActivity1.class);
这两句后边加这一句 startActivity(intent);
2.替换文件，改包名：package com.example.minitwittersimulate;
3.创建home.xml文件
4.创建LoginActivity.java文件
5将LoginActivity.java中的MainActivity改为LoginAvtivity 此时运行显示错误，因为没有在
AndroidMainfest.xml文件中注册LoginActivity
 
6.在AndroidMainfest中注册Activity。
 
7运行成功！
 
LoginActivity.java
 
package com.example.minitwittersimulate;
 
 
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.Window;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
 
 
public class LoginActivity extends Activity {
 
 
 
 private EditText etUsername;
 private EditText etPassword;
 private CheckBox cbRememberPass;
 private CheckBox autologin1;
 private Button btnLogin ;
 private SharedPreferences sp;
 private String userNameValue,passwordValue;
 
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.activity_main);
 
  // 初始化用户名、密码、记住密码、自动登录、登录按钮
  etUsername = (EditText) findViewById(R.id.etUsername);
  etPassword = (EditText) findViewById(R.id.etPassword);
  cbRememberPass = (CheckBox) findViewById(R.id.cbRememberPass);
  autologin1 = (CheckBox) findViewById(R.id.autologin1);
  btnLogin = (Button) findViewById(R.id.btnLogin);
 
  sp = getSharedPreferences("userInfo", 0);
     String name=sp.getString("USER_NAME", "");
  String pass =sp.getString("PASSWORD", "");
   
 
  boolean choseRemember =sp.getBoolean("cbRememberPass", false);
  boolean choseAutoLogin =sp.getBoolean("autologin1", 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){
         etUsername.setText(name);
         etPassword.setText(pass);
         cbRememberPass.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){
         autologin1.setChecked(true);
        }
       
       
       
        btnLogin.setOnClickListener(new OnClickListener() {
     
   // 默认可登录帐号znn,密码0123
   @Override
   public void onClick(View arg0) {
    userNameValue = etUsername.getText().toString();
    passwordValue = etPassword.getText().toString();
    SharedPreferences.Editor editor =sp.edit();
   
    // TODO Auto-generated method stub
    if (userNameValue.equals("znn")
      && passwordValue.equals("0123")) {
     Toast.makeText(LoginActivity.this, "登录成功",
       Toast.LENGTH_SHORT).show();
    
     //保存用户名和密码
     editor.putString("USER_NAME", userNameValue);
     editor.putString("PASSWORD", passwordValue);
    
     //是否记住密码
     if(cbRememberPass.isChecked()){     

      editor.putBoolean("cbRememberPass", true);     

     }else{
      editor.putBoolean("cbRememberPass", false);   

     }
 
              
     //是否自动登录
      if(autologin1.isChecked()){      

       editor.putBoolean("autologin1", true);      

      }else{
       editor.putBoolean("autologin1", false);
      }
     editor.commit();
     
     //跳转
     //Intent intent =new Intent(MainActivity.this,SuccessActivity1.class);
     //startActivity(intent);
    
     Intent intent = new Intent();
     intent.setClass(LoginActivity.this, SuccessActivity1.class);
     startActivity(intent);
    
    
    
    
    } else {
     Toast.makeText(LoginActivity.this, "用户名或密码错误，请重新登录!",
       Toast.LENGTH_SHORT).show();
    }
 
   }
 
  });
      
 
 }
 
 
 
 
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
 
}
 
 
MainActivity.java
package com.example.minitwittersimulate;
 
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends Activity {
 private SharedPreferences sp;
 private TextView talk;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);    

       
        talk =(TextView) findViewById(R.id.talk);
       
        sp=getSharedPreferences("userInfo", 0);
        String name =sp.getString("USER_NAME", "");
        boolean choseAutoLogin =sp.getBoolean("autologin1", false);
        if(choseAutoLogin){
         talk.setVisibility(0);
         talk.setText(name+"自动登录成功");
        }
 
    }
    //跳转到登录页面
    public void go(View v){
     Intent intent =new Intent(this, LoginActivity.class);
     startActivity(intent);
    }
   
    //点击退出销毁登录记录
    public void out(View v){
     SharedPreferences spout =getSharedPreferences("userInfo", 0);
     SharedPreferences.Editor ed =spout.edit();
     ed.clear();
     ed.commit();
     Toast.makeText(this, "销毁记录", Toast.LENGTH_SHORT).show();
    }
}
 
 
 
 
SuccessActiviy.java
 
package com.example.minitwittersimulate;
 
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
 
public class SuccessActivity1 extends Activity {
 
 
 
 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sucess);
    }
 public void outactivity(View v){
 
  System.exit(0);
 }
}
 
activity_main.xml
 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/loginbg"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
  <include layout="@layout/login_top"/>
 
  <include layout="@layout/login_bottom" />
 
"
 
</LinearLayout>
 
home.xml
 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
 
    android:orientation="vertical" >
 
    <TextView
        android:id="@+id/talk"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:text="文本"
        android:gravity="center"
     android:visibility="gone"
        />
   
    <Button
        android:id="@+id/gologin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登录"
        android:onClick="go"
        />
    <Button
        android:id="@+id/out"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="注销"
         android:onClick="out"
        />
</LinearLayout>
 
 
login_bottom.xml
 
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
 
    <TextView
        android:id="@+id/tvRegist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="21dp"
        android:layout_marginTop="18dp"
        android:text="@string/tvRegister"
        android:autoLink="all"
        android:textColorLink="#FF0066CC" />
 
    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="28dp"
        android:src="@drawable/icon" />
 
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/imageView2"
        android:src="@drawable/jiqimao1" />
 
</RelativeLayout>
 
 
 
login_top.xml
 
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/btnbg_roundcorner"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >
 
    <TextView
        android:id="@+id/tvUsername"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/tvName"
        android:textAppearance="?android:attr/textAppearanceMedium" />
 
    <EditText
        android:id="@+id/etUsername"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/tvUsername"
        android:layout_below="@+id/tvUsername"
        android:background="@android:drawable/edit_text"
        android:ems="10" >
 
        <requestFocus />
    </EditText>
 
    <TextView
        android:id="@+id/tvPassword"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/etUsername"
        android:layout_below="@+id/etUsername"
        android:text="@string/tvPassword"
        android:textAppearance="?android:attr/textAppearanceMedium" />
 
    <EditText
        android:id="@+id/etPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/tvPassword"
        android:layout_below="@+id/tvPassword"
        android:layout_marginTop="16dp"
        android:background="@android:drawable/edit_text"
        android:ems="10"
        android:inputType="textPassword" />
 
    <Button
        android:id="@+id/btnLogin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/etPassword"
        android:layout_below="@+id/etPassword"
        android:layout_marginTop="20dp"
        android:background="#FF72CAE1"
        android:text="@string/btnLogin" />
 
    <CheckBox
        android:id="@+id/cbRememberPass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/etPassword"
        android:layout_alignTop="@+id/btnLogin"
        android:text="记住密码" />
 
    <CheckBox
        android:id="@+id/autologin1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/cbRememberPass"
        android:layout_below="@+id/cbRememberPass"
        android:text="自动登录" />
 
</RelativeLayout>
 
success.xml
 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:gravity="center"
        android:text="登录成功，重启程序才可以看到效果哦~" />
   
</LinearLayout>