Android中使用SharedPreferences完成记住账号密码的功能

private SharedPreferences config;config=getSharedPreferences("config", MODE_PRIVATE);

Editor edit=config.edit();

String username=et_username.getText().toString();String password=et_password.getText().toString();edit.putString("username", username).putString("password", password);

edit.commit(); 

package fry;import com.example.rememberUserAndPassword.R;import android.app.Activity;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.TextView;import android.widget.Toast;public class Activity01 extends Activity{  private Button btn_login;  private TextView et_username;  private TextView et_password;  private CheckBox cb_choose;  private SharedPreferences config;  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.activity01);    config=getSharedPreferences("config", MODE_PRIVATE);    btn_login=(Button) findViewById(R.id.btn_login);    et_username=(TextView) findViewById(R.id.et_username);    et_password=(TextView) findViewById(R.id.et_password);    cb_choose=(CheckBox) findViewById(R.id.cb_choose);    //是否记住了密码，初始化为false    boolean isCheck=config.getBoolean("isCheck", false);    //Toast.makeText(this, isCheck+" ", Toast.LENGTH_SHORT).show();    if(isCheck){      et_username.setText(config.getString("username", ""));      et_password.setText(config.getString("password", ""));      cb_choose.setChecked(isCheck);    }  }  //权限要是public,要不然访问不到  //因为在button控件中设置了android:onClick="onClick"  public void onClick(View view){    Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();    Editor edit=config.edit();    String username=et_username.getText().toString();    String password=et_password.getText().toString();    boolean isCheck=cb_choose.isChecked();    //Toast.makeText(this, isCheck+" ", Toast.LENGTH_SHORT).show();    //存储CheckBox的状态    edit.putBoolean("isCheck", isCheck);    if(isCheck){      edit.putString("username", username).putString("password", password);    }else{      edit.remove("username").remove("password");    }    //提交到本地    edit.commit();  }}

<?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" >  <EditText     android:id="@+id/et_username"    android:layout_width="match_parent"    android:layout_height="wrap_content"    />  <EditText    android:id="@+id/et_password"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:ems="10" >    <requestFocus />  </EditText>  <LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    >    <CheckBox         android:id="@+id/cb_choose"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      />    <TextView       android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="记住密码"      />  </LinearLayout>  <!-- android:onClick="onClick" 点击时去class中调用onClick方法，权限要为public -->  <Button    android:id="@+id/btn_login"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="登录"    android:layout_gravity="center_horizontal"    android:onClick="onClick"    /></LinearLayout>