Android：利用SharedPreferences实现自动登录

Android：利用SharedPreferences实现自动登录

public class LoginActivity extends Activity {
private EditText username;
private EditText userpassword;
private CheckBox remember;
private CheckBox autologin;
private Button login;
private SharedPreferences sp;
private String userNameValue,passwordValue;

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

// 初始化用户名、密码、记住密码、自动登录、登录按钮
username = (EditText) findViewById(R.id.username);
userpassword = (EditText) findViewById(R.id.userpassword);
remember = (CheckBox) findViewById(R.id.remember);
autologin = (CheckBox) findViewById(R.id.autologin);
login = (Button) findViewById(R.id.login);

sp = 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);
//      Toast.makeText(this, name, Toast.LENGTH_SHORT).show();

//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){
username.setText(name);
userpassword.setText(pass);
remember.setChecked(true
4000
);
}
//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){
autologin.setChecked(true);
}

login.setOnClickListener(new OnClickListener() {

// 默认可登录帐号tinyphp,密码123
@Override
public void onClick(View arg0) {
userNameValue = username.getText().toString();
passwordValue = userpassword.getText().toString();
SharedPreferences.Editor editor =sp.edit();

// TODO Auto-generated method stub
if (userNameValue.equals("tinyphp")
&& passwordValue.equals("123")) {
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(remember.isChecked()){
editor.putBoolean("remember", true);
}else{
editor.putBoolean("remember", false);
}

//是否自动登录
if(autologin.isChecked()){
editor.putBoolean("autologin", true);
}else{
editor.putBoolean("autologin", false);
}
editor.commit();

//跳转
Intent intent =new Intent(LoginActivity.this,SuccessActivity.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();
}

}

});

}

}

<?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"
android:padding="10dp" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="用户名：" />

<EditText
android:id="@+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" >
</EditText>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="密码：" />

<EditText
android:id="@+id/userpassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword" >
</EditText>

<CheckBox
android:id="@+id/remember"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="记住密码" />

<CheckBox
android:id="@+id/autologin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="自动登录" />

<Button
android:id="@+id/login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="登录" />

</LinearLayout>