1 . 编辑布局文件
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.administrator.myapplication.MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" /> <TextView android:text="TextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView" android:layout_alignParentStart="true" android:layout_marginStart="47dp" android:layout_marginTop="94dp" android:id="@+id/tv1" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:inputType="textPersonName" android:text="pwd" android:ems="10" android:layout_below="@+id/textView" android:layout_toEndOf="@+id/tv1" android:layout_marginStart="13dp" android:layout_marginTop="63dp" android:id="@+id/et1" /> <Button android:text="提交" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btn" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="134dp" /> <CheckBox android:text="记住密码" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/tv1" android:layout_toEndOf="@+id/tv1" android:layout_marginTop="45dp" android:id="@+id/cb1" /> <CheckBox android:text="自动登录" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="21dp" android:id="@+id/cb2" android:layout_below="@+id/cb1" android:layout_alignStart="@+id/cb1" /> </RelativeLayout>2 . MainActivity代码
package com.example.administrator.myapplication; 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 { Button btn_sbmit; EditText user_pwd; CheckBox ck_pwd,ck_auto; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn_sbmit = (Button) findViewById(R.id.btn); ck_pwd = (CheckBox) findViewById(R.id.cb1); ck_auto = (CheckBox) findViewById(R.id.cb2); user_pwd = (EditText) findViewById(R.id.et1); SharedPreferences sp = getSharedPreferences("login",MODE_PRIVATE); if(sp.getString("auto","0").equals("1")){ startActivity(new Intent(MainActivity.this,Main2Activity.class)); } btn_sbmit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(ck_pwd.isChecked()){ SharedPreferences sharedPreferences = getSharedPreferences("login",MODE_PRIVATE); SharedPreferences.Editor edit = sharedPreferences.edit(); edit.putString("name",user_pwd.getText().toString()); edit.putString("auto","1"); edit.commit(); Toast.makeText(MainActivity.this, user_pwd.getText().toString(), Toast.LENGTH_SHORT).show(); } startActivity(new Intent(MainActivity.this,Main2Activity.class)); } }); } }3 . tool->File Exlorer ->目录data/data/项目名称（我的）->shared_prefs
4 . 取消自动登录
@Override protected void onDestroy() { super.onDestroy(); SharedPreferences sharedPreferences = getSharedPreferences("login",MODE_PRIVATE); SharedPreferences.Editor edit = sharedPreferences.edit(); edit.putString("auto","0"); edit.commit(); }