android記住登陸信息登陸狀態 使用SharePreference接口

public class MainActivity extends AppCompatActivity {
    EditText ueditText, peditText;
    CheckBox checkBox;
    Button button;
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    private GoogleApiClient client;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ueditText = (EditText) findViewById(R.id.ed_user);
        peditText = (EditText) findViewById(R.id.ed_password);
        checkBox= (CheckBox) findViewById(R.id.cb_remember);
        button= (Button) findViewById(R.id.button);
        //使用SharePreferences取出保存的數據，並把數據顯示在手機屏幕上
        //初始化數據
        SharedPreferences sharedPreferences=getSharedPreferences("config",0);
        //取出數據，若是取出的數據時空時，只需把getString("","")第二個參數設置成空字符串就好了，不用在判斷
        String name=sharedPreferences.getString("name","");
        String password=sharedPreferences.getString("password","");
        //獲取勾選的狀態
        boolean checkbox=sharedPreferences.getBoolean("checkbox",false);
        ueditText.setText(name);
        peditText.setText(password);
        checkBox.setChecked(checkbox);
    }
    //使用Sharepreferences進行保存數據
   public void login(View view){
       //獲取密碼和用戶名
       String username=ueditText.getText().toString();
       String passwowrd=peditText.getText().toString();
       //文本判斷是否爲空，新的API:TextUtils.isEmty()
       if (TextUtils.isEmpty(username)&&TextUtils.isEmpty(passwowrd)){
           Toast.makeText(MainActivity.this,"用戶名和密碼不能爲空",Toast.LENGTH_LONG).show();
       }else{
           System.out.println("之後補上");
           if (checkBox.isChecked()){
               //把密碼和用戶名存起來
               //getSharedPreferences(name,model);,name 會生成一個xml文件，model ：模式，可讀可寫等模式
               SharedPreferences sp=getSharedPreferences("config",0);
               SharedPreferences.Editor editor=sp.edit();
               //把數據進行保存
               editor.putString("name",username);
               editor.putString("password",passwowrd);
               //記住勾選的狀態
               editor.putBoolean("checkbox",checkBox.isChecked());
               //提交數據
               editor.commit();
           }else{
               Toast.makeText(MainActivity.this,"未勾選",Toast.LENGTH_LONG).show();
           }
       }
   }
    /**
     * Sharepreference使用的步驟
     * 1.獲取sp的實例
     * Sharepreference sp=getSharepreference(name,model);
     * 2.獲取編輯器
     * Editor editor=sp.edit();
     * 3.存數據
     * editor.putString(name,值)
     * 4.提交
     * editor.commit();
     */
}
xml文件

<LinearLayout 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"    android:orientation="vertical"    tools:context="com.hx.myapplication.MainActivity">   <EditText       android:id="@+id/ed_user"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:hint="@string/husername"/>    <EditText        android:id="@+id/ed_password"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:password="true"        android:hint="@string/hpsword"/>    <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content">        <CheckBox            android:layout_marginTop="20dp"            android:id="@+id/cb_remember"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/remember"/>        <Button            android:id="@+id/button"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_below="@+id/cb_remember"            android:text="@string/login"            android:onClick="login"/>    </RelativeLayout></LinearLayout>