我正在尝试创建一个应用程序,允许用户在设定的时间间隔内或手动将设备静音。我还希望用户能够输入更复杂的规则,例如仅当连接到特定 WiFi 网络、蓝牙设备或进入地理围栏时才将手机静音。然而,在静音模式下,我希望允许用户创建电话仍应响铃的联系人列表。
为此,我创建了一个前台服务,我在其中注册了一个广播接收器。然而,在 Activity 离开前台仅几分钟后,接收器就会停止工作并不时更新。
该问题出现在安卓8的设备(华为/荣耀7x)
注意:我尝试将应用程序添加到Doze 白名单 并禁用供应商特定的电池优化,但没有任何改变。
下面是我的代码的 MCVE。每当服务中的接收器被触发时,一些 int 值会增加,然后它们会显示在通知中。在我的设备上,由于 Activity 离开前台,值在几分钟后停止增加:
list 权限
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
list 声明服务
<service android:name=".PhoneService"/>
启动服务的内部 Activity
//for the sake of simplicity, I omit the code where runtime permissions are requested
Intent foregroundIntent = new Intent(this, PhoneService.class);
foregroundIntent.putExtra(PhoneService.EXTRA_ACTION, PhoneService.ACTION_START);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
startForegroundService(foregroundIntent);
} else {
startService(foregroundIntent);
}
服务等级
public class PhoneService extends Service {
private static final String NOTIFICATION_CATEGORY = "notification_category";
private static final int NOTIFICATION_REQUEST_CODE = 0;
private static final String CHANNEL_ID = "test_channel";
private static final String CHANNEL_NAME = "test channel";
private static final int NOTIFICATION_ID = 1;
public static final String EXTRA_ACTION = "extra_action";
public static final String ACTION_START = "action_start";
public static final String ACTION_STOP = "action_stop";
private static final int STOP_ID = 2;
private int phoneReceiveCount = 0;
private int btReceiveCount = 0;
BroadcastReceiver phoneReceiver;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
final IntentFilter intentFilter = new IntentFilter();
//adding some filters
intentFilter.addAction("android.intent.action.PHONE_STATE");
intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
this.phoneReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//update the count and show it in the notification body
//used only to see if the receiver works
String action = intent.getAction();
if (action != null && action.equals("android.intent.action.PHONE_STATE")) {
phoneReceiveCount++;
} else if (action != null && (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED)) || action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)) {
btReceiveCount++;
}
createNotification(context);
}
};
registerReceiver(phoneReceiver, intentFilter);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String action = intent.getStringExtra(EXTRA_ACTION);
if (action.equals(ACTION_START)) {
createNotification(this);
} else if (action.equals(ACTION_STOP)) {
stopSelf();
}
//also tried with START_STICKY
return START_REDELIVER_INTENT;
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(phoneReceiver);
}
private void createNotification(Context context) {
//intent to open app
Intent entryActivityIntent = new Intent(context, MainActivity.class);
entryActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingEntryActivityIntent = PendingIntent.getActivity(context, NOTIFICATION_REQUEST_CODE, entryActivityIntent, PendingIntent.FLAG_UPDATE_CURRENT);
//intent to stop foreground service
Intent stopServiceIntent = new Intent(context, PhoneService.class);
stopServiceIntent.putExtra(PhoneService.EXTRA_ACTION, PhoneService.ACTION_STOP);
stopServiceIntent.addCategory(NOTIFICATION_CATEGORY);
PendingIntent pendingStopForeground = PendingIntent.getService(context, STOP_ID, stopServiceIntent, PendingIntent.FLAG_UPDATE_CURRENT);
//build notification
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(
CHANNEL_ID,
CHANNEL_NAME,
NotificationManager.IMPORTANCE_LOW);
channel.enableVibration(false);
channel.enableLights(false);
notificationManager.createNotificationChannel(channel);
}
String contentText = "phoneReceiveCount: " + String.valueOf(phoneReceiveCount) + "\nbtReceiveCount: " + String.valueOf(btReceiveCount);
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(context, CHANNEL_ID)
.setColor(ContextCompat.getColor(context, R.color.colorPrimary))
.setSmallIcon(R.drawable.ic_service_on)
.setContentTitle("This is the title")
.setContentText(contentText)
.addAction(R.drawable.ic_stop, "Stop", pendingStopForeground)
.setStyle(new NotificationCompat.BigTextStyle().bigText(contentText))
.setContentIntent(pendingEntryActivityIntent);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN && Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
notificationBuilder.setPriority(NotificationCompat.PRIORITY_HIGH);
}
startForeground(NOTIFICATION_ID, notificationBuilder.build());
}
最佳答案
从 Android 8 开始,后台服务和广播有某些限制,例如广播接收器必须在运行时使用 context.registerReceiver 注册。
详细解释请看这个链接:
https://developer.android.com/about/versions/oreo/background#broadcasts
您的目标 SDK 高于 25。降低可能会解决问题,但不推荐这样做。按照文档中的指南和步骤解决问题。
关于android - 广播接收器在 Android 8 的前台服务中不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51608900/