使用SharedPreferences存储用户名信息

package com.example.sharedpreferences;

import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
    private EditText et1,et2;
    private CheckBox cb1;
    private Button bt1,bt2;
    private SharedPreferences pref;
    private Editor editor;
    private TextView tv1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
//        SharedPreferences pref = getSharedPreferences("mypref", MODE_PRIVATE);
//        Editor editor = pref.edit();
//        editor.putString("name", "阿狸");
//        editor.putLong("time", System.currentTimeMillis());
//        editor.commit();
//        System.out.println(pref.getString("name", ""));
//        System.out.println(pref.getLong("time", 0));
        
        et1 = (EditText) findViewById(R.id.editText1);
        et2 = (EditText) findViewById(R.id.editText2);
        cb1 = (CheckBox) findViewById(R.id.checkBox1);
        bt1 = (Button) findViewById(R.id.button1);
        bt2 = (Button) findViewById(R.id.button2);
        tv1 = (TextView) findViewById(R.id.textView1);
        bt1.setOnClickListener(this);
        bt2.setOnClickListener(this);
        pref = getSharedPreferences("mypref1", MODE_PRIVATE);
        editor = pref.edit();
        String name = pref.getString("username", "");
        if(name == null) {
            cb1.setChecked(false);
        }else{
            cb1.setChecked(true);
            et1.setText(name);
        }
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.button1:
            String name = et1.getText().toString().trim();
            String pass = et2.getText().toString().trim();
            if(name.equals("admin")&&pass.equals("123456")){
                if(cb1.isChecked()){
                    editor.putString("username", "admin");
                    editor.commit();
                }else {
                    editor.remove("username");
                    editor.commit();
                }
                Toast.makeText(MainActivity.this, "登陆成功！", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(MainActivity.this, "登陆失败！", Toast.LENGTH_SHORT).show();
            }
            break;
        case R.id.button2:
            
            break;
        }
    }
    
}

上面是MainActivity的代码，下面是UI的代码。

<RelativeLayout 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"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="17dp"
        android:layout_marginTop="18dp"
        android:text="用户名：" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView1"
        android:layout_alignBottom="@+id/textView1"
        android:layout_alignRight="@+id/button2"
        android:layout_toRightOf="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="14dp"
        android:text="密码：" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignRight="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:ems="10"
        android:inputType="textPassword" />

    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView2"
        android:layout_below="@+id/editText2"
        android:layout_marginTop="16dp"
        android:checked="false"
        android:text="保存" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/checkBox1"
        android:layout_below="@+id/checkBox1"
        android:layout_marginTop="14dp"
        android:text="确定" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button1"
        android:layout_alignBottom="@+id/button1"
        android:layout_alignParentRight="true"
        android:layout_marginRight="26dp"
        android:text="取消" />

</RelativeLayout>

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