记住用户密码的登陆

一、运行效果图





 

二、核心代码

1.LoginActivity代码：

public class LoginActivity extends Activity {
private EditText etUsername;
private EditText etPassword;
private CheckBox cbRememberPass;
private Button btnLogin;
private SharedPreferences sp;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_login);
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);

cbRememberPass.setOnClickListener((OnClickListener) this);
btnLogin.setOnClickListener((OnClickListener) this);

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，那登陆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);
}
// 如果上次登陆选了自动登录，那进入登陆页面也自动勾选自动登录
/*
* if (choseAutoLogin) { autologin1.setChecked(true); }
*/
btnLogin.setOnClickListener(new OnClickListener() {
private String userNameValue;
private String passwordValue;

// 默认可登陆账号android，密码123456
public void onClick(View v) {
userNameValue = etUsername.getText().toString();
passwordValue = etPassword.getText().toString();
SharedPreferences.Editor editor = sp.edit();
if (userNameValue.equals("android")
&& passwordValue.equals("123456")) {
Toast.makeText(LoginActivity.this, "登陆成功",
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);
}

// 是否自动登陆
/*
* if (autologin1.isChecked()) {
* editor.putBoolean("autologin1", true); } else {
* editor.putBoolean("autologin1", false); }
*/
// editor.commit();
// 跳转
Intent intent = new Intent(LoginActivity.this,
MainActivity.class);
startActivity(intent);

} else {
Toast.makeText(LoginActivity.this, "用户名或密码错误，请重新登陆",
Toast.LENGTH_SHORT).show();
}

}
});
}

public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

2.MainActivity的核心代码：

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/*public void go(View v){
//Intent intent = new Intent(this,LoginActivity.class);
//startActivity(intent);
Intent intent = new Intent();
intent.setClass(MainActivity.this, LoginActivity.cla
4000
ss);
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();
}*/

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

 

三、遇见的问题

     记住密码后，退出再重新进入程序，不能点击用户，自动出现密码，只能用户名和密码同时存在