android - 使用 BroadcastReceiver 安装 .apk 文件后，BroadcastReceiver 会继续运行吗？

Question

我认为即使我退出应用程序，BroadcastReceiver AlarmManagerBroadcastReceiver 也会继续运行。我认为 BroadcastReceiver 会在我重新启动系统时自动恢复并继续运行。为了停止广播接收器，我必须卸载应用程序，对吧？

布局

<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'>

    <Button
        android:layout_width='fill_parent'
        android:layout_height='wrap_content'
        android:padding='@dimen/padding_medium'
        android:text='@string/start_repeating_alarm'
        android:onClick='startRepeatingAlarm'
        tools:context='.EnableDisableBroadcastReceiver' />

    <Button
       android:layout_width='fill_parent'
       android:layout_height='wrap_content'
       android:padding='@dimen/padding_medium'
       android:text='@string/cancel_alarm'
       android:onClick='cancelAlarm'
       tools:context='.EnableDisableBroadcastReceiver' />

    <Button
        android:layout_width='fill_parent'
        android:layout_height='wrap_content'
        android:padding='@dimen/padding_medium'
        android:text='@string/enable_broadcast_receiver'
        android:onClick='enableBroadcastReceiver'
        tools:context='.EnableDisableBroadcastReceiver' />

   <Button
       android:layout_width='fill_parent'
       android:layout_height='wrap_content'
       android:padding='@dimen/padding_medium'
       android:text='@string/disable_broadcast_receiver'
       android:onClick='disableBroadcastReceiver'
       tools:context='.EnableDisableBroadcastReceiver' />

</LinearLayout>

资源

<resources>
    <string name='app_name'>EnableDisableBroadcastReceiver</string>
    <string name='enable_broadcast_receiver'>Enable Broadcast Receiver</string>
    <string name='disable_broadcast_receiver'>Disable Broadcast Receiver</string>
    <string name='start_repeating_alarm'>Start Repeating Alarm</string>
    <string name='cancel_alarm'>Cancel Alarm</string>
    <string name='menu_settings'>Settings</string>
    <string name='title_activity_enable_disable_boradcast_receiver'>EnableDisableBoradcastReceiver</string>
</resources>

广播接收器

public class AlarmManagerBroadcastReceiver extends BroadcastReceiver {

    final public static String ONE_TIME = 'onetime';

    @Override
    public void onReceive(Context context, Intent intent) {

         //You can do the processing here update the widget/remote views.
         StringBuilder msgStr = new StringBuilder();
         //Format time.
         Format formatter = new SimpleDateFormat('hh:mm:ss a');
         msgStr.append(formatter.format(new Date()));

         Toast.makeText(context, msgStr, Toast.LENGTH_SHORT).show();

    }
}

Activity

public class EnableDisableBroadcastReceiver extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void startRepeatingAlarm(View view)
    {
        AlarmManager am=(AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this, AlarmManagerBroadcastReceiver.class);
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, intent, 0);
        //After after 2 seconds
        am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * 4 , pi); 
        Toast.makeText(this, 'Started Repeating Alarm', Toast.LENGTH_SHORT).show();
    }

    public void cancelAlarm(View view)
    {
        Intent intent = new Intent(this, AlarmManagerBroadcastReceiver.class);
        PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(sender);
        Toast.makeText(this, 'Cancelled alarm', Toast.LENGTH_SHORT).show();
    }

    public void enableBroadcastReceiver(View view){
        ComponentName receiver = new ComponentName(this, AlarmManagerBroadcastReceiver.class);
        PackageManager pm = this.getPackageManager();

        pm.setComponentEnabledSetting(receiver,
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                PackageManager.DONT_KILL_APP);
        Toast.makeText(this, 'Enabled broadcast receiver', Toast.LENGTH_SHORT).show();
    }

    public void disableBroadcastReceiver(View view){
        ComponentName receiver = new ComponentName(this, AlarmManagerBroadcastReceiver.class);
        PackageManager pm = this.getPackageManager();

        pm.setComponentEnabledSetting(receiver,
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
        Toast.makeText(this, 'Disabled broadcst receiver', Toast.LENGTH_SHORT).show();
    }   
}

Answer 1

阅读Broadcastreceiver and Paused activity .它提到当您在 Activity 中以编程方式注册广播接收器时，当 Activity 暂停时它不会收到广播。

您可能会想要使用 Service如果你想在后台运行它。

A Service is an application component that can perform long-running operations in the background and does not provide a user interface.

让服务运行并在那里注册 BroadcastReceiver。您可以在 list 中注册它。如果你也想在重启时运行它，那么你需要使用:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

并将其放入接收器的 intent-filter 中:

<receiver android:enabled="true"           
android:permission="android.permission.RECEIVE_BOOT_COMPLETED" android:name=".MyReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"/>
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</receiver>

如果可能，您可以改为在 list 中注册广播接收器并在那里处理它。接收器在主线程上运行，因此理想情况下，您可以向正在运行的服务发出信号或在那里启动服务。您可能想阅读 Should an alarm be built with Service or BroadcastReceiver? .

希望对您有所帮助。