android记住登录信息登录状态 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取出保存的数据，并把数据显示在手机屏幕上        //初始化数据        SharedPreferences sharedPreferences=getSharedPreferences("config",0);        //取出数据，如果取出的数据时空时，只需把getString("","")第二个参数设置成空字符串就行了，不用在判断        String name=sharedPreferences.getString("name","");        String password=sharedPreferences.getString("password","");        //获取勾选的状态        boolean checkbox=sharedPreferences.getBoolean("checkbox",false);        ueditText.setText(name);        peditText.setText(password);        checkBox.setChecked(checkbox);    }    //使用Sharepreferences进行保存数据   public void login(View view){       //获取密码和用户名       String username=ueditText.getText().toString();       String passwowrd=peditText.getText().toString();       //文本判断是否为空，新的API:TextUtils.isEmty()       if (TextUtils.isEmpty(username)&&TextUtils.isEmpty(passwowrd)){           Toast.makeText(MainActivity.this,"用户名和密码不能为空",Toast.LENGTH_LONG).show();       }else{           System.out.println("以后补上");           if (checkBox.isChecked()){               //把密码和用户名存起来               //getSharedPreferences(name,model);,name 会生成一个xml文件，model ：模式，可读可写等模式               SharedPreferences sp=getSharedPreferences("config",0);               SharedPreferences.Editor editor=sp.edit();               //把数据进行保存               editor.putString("name",username);               editor.putString("password",passwowrd);               //记住勾选的状态               editor.putBoolean("checkbox",checkBox.isChecked());               //提交数据               editor.commit();           }else{               Toast.makeText(MainActivity.this,"未勾选",Toast.LENGTH_LONG).show();           }       }   }    /**     * Sharepreference使用的步骤     * 1.获取sp的实例     * Sharepreference sp=getSharepreference(name,model);     * 2.获取编辑器     * Editor editor=sp.edit();     * 3.存数据     * 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>