基本文件架构如下

ActivityColletor.java

import java.util.List;

/**
 * 
 */
public class ActivityCollector {
    private static List<Activity> activities = new ArrayList<Activity>();

    public static void addActivity(Activity activity){
        activities.add(activity);
    }

    public static void removeActivity(Activity activity){
        activities.remove(activity);
    }

    public static void finishAll(){
        for(Activity activity:activities){
            if(!activity.isFinishing()){
                activity.finish();
            }
        }
    }
}

重建一个基类

package com.example.hellogxp.sharedpreference3;

import android.app.Activity;
import android.os.Bundle;

import java.util.ArrayList;
import java.util.List;

/**
 * 
 */
public class BaseActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ActivityCollector.removeActivity(this);
    }
}

强制下线的广播接收器

package com.example.hellogxp.sharedpreference3;

import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.Window;
import android.view.WindowManager;

/**
 * 
 */
public class ForceOfflineReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("force offline");
        builder.setMessage("you are force offline,please try login again");
        builder.setCancelable(false);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                ActivityCollector.finishAll();
                Intent intent = new Intent(context, LoginActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intent);
            }
        });
        AlertDialog alertDialog = builder.create();
        alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
        alertDialog.show();
    }
}

登录的业务逻辑

package com.example.hellogxp.sharedpreference3;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
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 LoginActivity extends BaseActivity {
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor editor;
    private EditText editTextAccount, editTextPassword;
    private Button buttonRememberMe;
    private CheckBox checkBoxRememberMe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);

        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        editTextAccount = (EditText) findViewById(R.id.account);
        editTextPassword = (EditText) findViewById(R.id.password);
        buttonRememberMe = (Button) findViewById(R.id.login);
        checkBoxRememberMe = (CheckBox) findViewById(R.id.remember_me);

        boolean isRemember = sharedPreferences.getBoolean("remember_me", false);
        if(isRemember){
            String account = sharedPreferences.getString("account", "");
            String password = sharedPreferences.getString("password", "");
            editTextAccount.setText(account);
            editTextPassword.setText(password);
            checkBoxRememberMe.setChecked(true);
        }

        buttonRememberMe.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String account = editTextAccount.getText().toString();
                String password = editTextPassword.getText().toString();
                if(account.equals("hellogxp") && password.equals("123456")){
                    editor = sharedPreferences.edit();
                    if(checkBoxRememberMe.isChecked()){
                        editor.putString("account", account);
                        editor.putString("password", password);
                        editor.putBoolean("remember_me", true);
                    } else {
                        editor.clear();
                    }
                    editor.commit();
                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                } else {
                    Toast.makeText(LoginActivity.this, "account or password invalid", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

Main类

package com.example.hellogxp.sharedpreference3;

import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
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;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button buttonForceOffline = (Button) findViewById(R.id.force_offline);
        buttonForceOffline.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent("com.example.hellogxp.sharedpreference3.FORECE_OFFLINE");
                sendBroadcast(intent);
            }
        });
    }
}

AndroidManifest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.hellogxp.sharedpreference3">
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".LoginActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity"></activity>
        <receiver android:name=".ForceOfflineReceiver">
            <intent-filter>
                <action android:name="com.example.hellogxp.sharedpreference3.FORECE_OFFLINE" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

登录布局文件

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:stretchColumns="1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TableRow>
        <TextView
            android:text="@string/account"
            android:layout_height="wrap_content" />
        <EditText
            android:gravity="center"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/account_hint"
            android:id="@+id/account" />
    </TableRow>
    <TableRow>
        <TextView
            android:text="@string/password"
            android:layout_height="wrap_content" />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:id="@+id/password" />
    </TableRow>
    <TableRow>
        <CheckBox
            android:id="@+id/remember_me"
            android:layout_height="wrap_content" />
        <TextView
            android:layout_height="wrap_content"
            android:text="@string/remember_me" />
    </TableRow>
    <TableRow>
        <Button
            android:layout_span="2"
            android:text="@string/login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/login" />
    </TableRow>

</TableLayout>

Main布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/force_offline"
        android:text="@string/force_offline"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

项目下载地址

http://pan.baidu.com/s/1jH7tn4y