参考书籍：《第一行代码》

博主在大学期间学习安卓开发的时候，其中一个功能实训是开发如题所示的功能，结果在网上搜的实现的例子，没一个正确的，全都有问题，都是点击按钮没反应。博主翻了翻教材，才发现大多教程都有问题，缺胳膊少腿的，因此写了这篇教程，希望能帮助到大家。
开发环境：
Android Studio 3.5.3
JDK:1.8
Android API:29
运行环境：Android Q_x64
废话不多说，下面开整！
新建项目之类的就不说了，

为了避免混淆，特此说明，本次演示的功能
第一个登陆页面为【MainActivity】，登陆后进入【optionsActivity】,点击强制下线后，出现警告框，提示被强制下线，然后返回登陆页面【MainActivity】，请根据此业务逻辑按需修改

首先创建一个BaseActivity用以作为需要被结束掉的进程的父类

BaseActivity.java

import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;public class BaseActivity extends AppCompatActivity {private ForceOfflineReceiver receiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);ActivityCollector.addActivity(this);}@Overrideprotected void onResume(){super.onResume();IntentFilter intentFilter = new IntentFilter();intentFilter.addAction("com.example.myapplication.FORCE_OFFLINE");//注意，此地的"com.example.myapplication"应修改为你自己的包名，下同。receiver = new ForceOfflineReceiver();registerReceiver(receiver,intentFilter);}@Overrideprotected void onPause(){super.onPause();if(receiver!=null){unregisterReceiver(receiver);receiver=null;}}@Overrideprotected void onDestroy() {super.onDestroy();ActivityCollector.removeActivity(this);}class ForceOfflineReceiver extends BroadcastReceiver{@Overridepublic void onReceive(final Context context, Intent intent) {AlertDialog.Builder builder = new AlertDialog.Builder(context);builder.setTitle("警告");builder.setMessage("您已经被强制下线，请尝试重新登录");builder.setCancelable(false);builder.setPositiveButton("OK",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {ActivityCollector.finishAll(); // 销毁所有活动Intent intent = new Intent(context,MainActivity.class);context.startActivity(intent);}});builder.show();}}
}

登陆页面
MainActivity.java

public class MainActivityextends BaseActivity {private EditText accountEdit; private EditText passwordEdit; private Button login;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login);accountEdit = (EditText) findViewById(R.id.account); passwordEdit = (EditText) findViewById(R.id.password); login = (Button) findViewById(R.id.login); login.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String account = accountEdit.getText().toString(); String password = passwordEdit.getText().toString();// 如果账号是admin且密码是123456，就认为登录成功if (account.equals("admin") && password.equals("123456")) { Intent intent = new Intent(LoginActivity.this,MainActivity.class); startActivity(intent); finish();} else {Toast.makeText(LoginActivity.this, "account or passwordis invalid",}}});}Toast.LENGTH_SHORT).show();}

Activity_Main.xml

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:stretchColumns="1" ><TableRow><TextView android:layout_height="wrap_content" android:text="Account:" /><EditText android:id="@+id/account" android:layout_height="wrap_content" android:hint="Input your account" /></TableRow><TableRow><TextView android:layout_height="wrap_content" android:text="Password:" /><EditText android:id="@+id/password" android:layout_height="wrap_content" android:inputType="textPassword" /></TableRow><TableRow><Button android:id="@+id/login" android:layout_height="wrap_content" android:layout_span="2" android:text="Login" /></TableRow></TableLayout>

ActivityCollector.java
用以把活动加入和移出数组，进行一次性销毁。

public class ActivityCollector {public static List<Activity> activities = new ArrayList<>();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();}}activities.clear();}
}

登陆之后的活动
OptionsActivity.java

public class OptionsActivity extends BaseActivity {private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_options);Button forceOffline = (Button) findViewById(R.id.force_offline);//强制下线按钮forceOffline.setOnClickListener(new View.OnClickListener() {   //强制下线动作监听器@Overridepublic void onClick(View v) {Intent i = new Intent("com.example.myapplication.FORCE_OFFLINE");sendBroadcast(i);  //发送广播}});}
}

activity_options.xml
就一个按钮，注意id一致即可

<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:layout_width="match_parent" android:layout_height="wrap_content" android:text="Send force offline broadcast" /></LinearLayout>

运行效果：

有问题可以评论交流。