Android中的密码记住功能怎么利用 sharedPreferences实现

package com.example.bz0209.login;import android.content.DialogInterface;import android.content.Intent;import android.content.SharedPreferences;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity {  private EditText username;  private EditText password;  private CheckBox ck;  private SharedPreferences sharedPreferences;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();    sharedPreferences=getSharedPreferences("remeberword",MODE_PRIVATE);    Boolean isRemeber=sharedPreferences.getBoolean("remeberword",false);    if(isRemeber) {      String name=sharedPreferences.getString("name","");      String pass=sharedPreferences.getString("pass","");      username.setText(name);      password.setText(pass);      ck.setChecked(true);    }  }  private void initView(){    username=(EditText)findViewById(R.id.username);    password=(EditText)findViewById(R.id.password);    ck= (CheckBox) findViewById(R.id.ck);  }  private void login(View view){//在layout中设置onClick事件    String name=username.getText().toString();    String pass=password.getText().toString();    if("admin".equals(name)&&"123".equals(pass)){     SharedPreferences.Editor editor=sharedPreferences.edit();      if(ck.isChecked()){        editor.putBoolean("remeberword",true);        editor.putString("name",name);        editor.putString("pass",pass);      }else{        editor.clear();      }      editor.commit();    }  }}