我正在尝试创建一个允许用户在设置的时间间隔内或手动使设备静音的应用程序。我还希望用户能够输入更复杂的规则,例如仅在连接到某个WiFi网络,蓝牙设备或进入地理围栏内时才将手机静音。但是,在静音模式下,我希望允许用户创建电话仍应为其响铃的联系人列表。
为此,我创建了一个前台服务,在其中注册了广播接收器。但是,从活动离开前台仅几分钟后,接收器便停止按时工作并不时更新。
在装有Android 8的设备(华为/荣耀7x)中会发生此问题。
注意:我试图将应用添加到 打ze白名单 ,并禁用特定于供应商的电池优化,但未进行任何更改。
下面是我的代码的MCVE。每当触发服务内的接收器时,某些int值都会递增,然后在通知中显示。在我的设备上,自活动离开前台以来,值在几分钟后停止增加:
清单权限
<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"/>
舱单声明服务
<service android:name=".PhoneService"/>
内部活动以启动服务
//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());
}
}
答案 0 :(得分:0)
从Android 8开始,后台服务受到某些限制,必须在运行时使用context.registerReceiver注册广播之类的广播接收器。
请查看此链接以获取详细说明:
您的目标SDK高于25。降低该值可能可以解决问题,但不建议这样做。请按照文档中的准则和步骤来解决此问题。