下面是MainActivity对应的布局文件activity_main.xml：
<LinearLayout xmlns:android="http://www.easck.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/force_offline"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="强制下线" />
</LinearLayout>
即在该布局中有一按钮，当点击时，发送强制下线的广播，当然了我们接下来要创建广播接收器：
6、广播接收器
package com.example.broadcastpractice;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.view.WindowManager;
/**
* 强制下线广播接收器
* @author yy
*
*/
public class ForceOfflineBroadCastReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, Intent intent) {
//对话框
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("警告");
//正文
builder.setMessage("你已被强制下线，请重新登陆。");
//不可取消
builder.setCancelable(false);
//按钮
builder.setPositiveButton("确定", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//销毁所有活动
ActivityCollector.finishAll();
//启动登陆活动
Intent intent = new Intent(context,LoginActivity.class);
//在广播中启动活动，需要添加如下代码
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
AlertDialog alterDialog = builder.create();
//添加对话框类型：保证在广播中正常弹出
alterDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
//对话框展示
alterDialog.show();
}
}
7、全集配置文件AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://www.easck.com/apk/res/android"
package="com.example.broadcastpractice"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<!-- 登陆活动为主活动 -->
<activity
android:name="com.example.broadcastpractice.LoginActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- MainActivity活动 -->
<activity android:name=".MainActivity"/>
<!-- 广播接收器 -->
<receiver android:name=".ForceOfflineBroadCastReceiver">
<intent-filter>
<action android:name="com.example.broadcastpractice.FORCE_OFFLINE"/>
</intent-filter>
</receiver>
</application>
</manifest>
