[英]Broadcast Receiver is not working when application is removed from background?
我試圖在我的移動應用程序中運行此代碼,但它沒有運行,也沒有給出任何錯誤。 我也試過打印日志,但它沒有在logcat中顯示任何內容。 此問題僅發生在Oreo中,並且在所有其他Android版本中運行良好,在應用程序處於后台時運行良好。
public class MainActivity extends AppCompatActivity {
AlarmManager am;
TimeAlarm timeAlarm;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
setOneTimeAlarm();
}
public void setOneTimeAlarm() {
Intent intent = new Intent(this, TimeAlarm.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (5 * 1000), pendingIntent);
}
public void setRepeatingAlarm() {
Intent intent = new Intent(this, TimeAlarm.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), (5 * 1000), pendingIntent);
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d("ondestroy","ondestroy");
}
@Override
protected void onStart() {
super.onStart();
Log.d("onstart","onstart");
IntentFilter intentFilter=new IntentFilter("my.custom.action.tag.fordemo");
intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(timeAlarm,intentFilter);
}
}
代碼廣播接收器,當我從后台刪除應用程序時,它停止工作。
public class TimeAlarm extends BroadcastReceiver {
NotificationManager nm;
String channelId = "channel-01";
String channelName = "Channel Name";
int importance = NotificationManager.IMPORTANCE_HIGH;
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public void onReceive(Context context, Intent intent) {
nm = (NotificationManager)
context.getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel(
channelId, channelName, importance);
nm.createNotificationChannel(mChannel);
} else {
}
CharSequence from = "Nithin";
CharSequence message = "Crazy About Android...";
PendingIntent contentIntent =
PendingIntent.getActivity(context, 0, new Intent(), 0);
//Notification notif = new Notification(R.drawable.logo,
"Crazy About Android...", System.currentTimeMillis());
NotificationCompat.Builder notification = new
NotificationCompat.Builder(context.getApplicationContext());
// notification.setContentIntent(pintent);
notification.setTicker(from).setSubText(from).setSmallIcon(R.drawable.logo);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
notification.setChannelId(channelId);
}
Notification notification1 = notification.build();
notif.setLatestEventInfo(context, from, message,contentIntent);
nm.notify(1, notification1);
}
}
它在任何版本的操作系統的后台應該不起作用。 您正在onStart中注冊接收器,然后在onStop中取消注冊。 這意味着在處理onStop之后,OS的接收器不存在。 如果您看到它在其他版本的操作系統上運行,那實際上就是一個錯誤。
當然,您的broadcast
在您的申請被關閉時被殺死。 如果您在onStop
/ onDestroyed
unregisterReceiver
onDestroyed
,則會出現泄漏問題。 為避免這種情況,您應該實現一個Service
(並在您的服務中調用registerReceiver(timeAlarm,intentFilter);
即使您的應用程序關閉,它也會在后台運行)。
P / s:記得startForeground
以防止服務在Android 8.0或更高版本中被系統殺死。
您必須在清單中添加警報權限
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
還要注冊你的廣播
<receiver
android:name=".broadcast.ServiceBroadcast"
android:enabled="true"
android:exported="true"
android:label="RestartServices">
<intent-filter>
<action android:name="restart_services"/>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.