[英]Service start error while using Android notifications
我試圖在每天中午 12 點向應用程序用戶顯示通知,並按照此示例進行操作。 當時間到達目標時間時什么也沒有發生。 為什么會這樣?
這是我的NotifyService
類:
public class NotifyService extends Service {
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate(){
Uri sound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationManager mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
Intent intent1 = new Intent(this.getApplicationContext(), MainActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent1, 0);
Notification mNotify = new Notification.Builder(this)
.setContentTitle("Log Tasks!")
.setContentText("Complete your tasks for today")
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pIntent)
.setSound(sound)
.build();
mNM.notify(1, mNotify);
}
}
這是我在MainActivity
類中的調用方式:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private TextView english_button;
private TextView hindi_button;
private PendingIntent pendingIntent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
english_button = findViewById(R.id.english_button);
hindi_button = findViewById(R.id.hindi_button);
english_button.setOnClickListener(this);
hindi_button.setOnClickListener(this);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
int i = preferences.getInt("numberoflaunches", 1);
if (i < 1){
alarmMethod();
i++;
editor.putInt("numberoflaunches", i);
editor.commit();
}
}
@Override
public void onClick(View v) {
Intent i = null;
switch (v.getId()){
case R.id.english_button:
i = new Intent(MainActivity.this, Instructions.class);
startActivity(i);
break;
case R.id.hindi_button:
i = new Intent(MainActivity.this, Instructions.class);
startActivity(i);
break;
}
}
private void alarmMethod(){
Intent myIntent = new Intent(this , NotifyService.class);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
pendingIntent = PendingIntent.getService(this, 0, myIntent, 0);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.HOUR, 0);
calendar.set(Calendar.AM_PM, Calendar.PM);
calendar.add(Calendar.DAY_OF_MONTH, 1);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 60 * 24, pendingIntent);
Toast.makeText(MainActivity.this, "Start Alarm", Toast.LENGTH_LONG).show();
}
}
我試圖通過記錄和檢查alarmMethod()
是否被調用來縮小問題的范圍,但我看到它正在被調用,所以我無法弄清楚是什么導致了這里的問題。
這是日志:
2021-06-25 12:00:00.010 867-867/com.android.systemui D/KeyguardClockSwitch: Updating clock: 1200
2021-06-25 12:00:02.438 237-241/? E/android.system.suspend@1.0-service: Error opening kernel wakelock stats for: wakeup34: Permission denied
2021-06-25 12:00:02.435 237-237/? W/Binder:237_2: type=1400 audit(0.0:244): avc: denied { read } for name="wakeup34" dev="sysfs" ino=19014 scontext=u:r:system_suspend:s0 tcontext=u:object_r:sysfs:s0 tclass=dir permissive=0
2021-06-25 12:00:02.443 237-241/? E/android.system.suspend@1.0-service: Error opening kernel wakelock stats for: wakeup35: Permission denied
2021-06-25 12:00:02.439 237-237/? W/Binder:237_2: type=1400 audit(0.0:245): avc: denied { read } for name="wakeup35" dev="sysfs" ino=19077 scontext=u:r:system_suspend:s0 tcontext=u:object_r:sysfs:s0 tclass=dir permissive=0
2021-06-25 12:00:54.137 505-505/? E/netmgr: qemu_pipe_open_ns:62: Could not connect to the 'pipe:qemud:network' service: Invalid argument
2021-06-25 12:00:54.138 505-505/? E/netmgr: Failed to open QEMU pipe 'qemud:network': Invalid argument
2021-06-25 12:00:54.806 516-516/? E/wifi_forwarder: qemu_pipe_open_ns:62: Could not connect to the 'pipe:qemud:wififorward' service: Invalid argument
2021-06-25 12:00:54.807 516-516/? E/wifi_forwarder: RemoteConnection failed to initialize: RemoteConnection failed to open pipe
2021-06-25 12:01:00.008 867-867/com.android.systemui D/KeyguardClockSwitch: Updating clock: 1201
2021-06-25 12:01:00.332 576-2933/system_process W/ActivityManager: Background start not allowed: service Intent { cmp=com.google.android.apps.messaging/.shared.datamodel.action.execution.ActionExecutorImpl$EmptyService } to com.google.android.apps.messaging/.shared.datamodel.action.execution.ActionExecutorImpl$EmptyService from pid=10958 uid=10115 pkg=com.google.android.apps.messaging startFg?=false
2021-06-25 12:01:00.335 10958-10958/com.google.android.apps.messaging W/BugleDataModel: ActionExecutorImpl: Action started execution, but we can't guarantee it will complete, the app may be killed. Action: class com.google.android.apps.messaging.shared.datamodel.action.CountryCodeDetectorAction-CountryCodeDetectorAction:3271432003
java.lang.IllegalStateException: Not allowed to start service Intent { cmp=com.google.android.apps.messaging/.shared.datamodel.action.execution.ActionExecutorImpl$EmptyService }: app is in background uid UidRecord{439a600 u0a115 CEM idle procs:1 seq(0,0,0)}
at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1715)
at android.app.ContextImpl.startService(ContextImpl.java:1670)
at android.content.ContextWrapper.startService(ContextWrapper.java:720)
at com.google.android.apps.messaging.shared.datamodel.action.execution.ActionExecutorImpl.a(PG:98)
at com.google.android.apps.messaging.shared.datamodel.action.execution.ActionExecutorImpl.a(PG:93)
at gjl.c(PG:119)
at gji.run(Unknown Source:1)
at afou.run(PG:3)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
2021-06-25 12:01:00.344 10958-10958/com.google.android.apps.messaging W/BugleDataModel: ActionExecutorImpl: Action started execution, but we can't guarantee it will complete, the app may be killed. Action: class com.google.android.apps.messaging.shared.datamodel.action.SelfParticipantsRefreshAction-SelfParticipantsRefreshAction:3271432004
java.lang.IllegalStateException: Not allowed to start service Intent { cmp=com.google.android.apps.messaging/.shared.datamodel.action.execution.ActionExecutorImpl$EmptyService }: app is in background uid UidRecord{439a600 u0a115 CEM idle procs:1 seq(0,0,0)}
at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1715)
at android.app.ContextImpl.startService(ContextImpl.java:1670)
at android.content.ContextWrapper.startService(ContextWrapper.java:720)
at com.google.android.apps.messaging.shared.datamodel.action.execution.ActionExecutorImpl.a(PG:98)
at com.google.android.apps.messaging.shared.datamodel.action.execution.ActionExecutorImpl.a(PG:93)
at gjl.c(PG:119)
at gji.run(Unknown Source:1)
at afou.run(PG:3)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
另外,我在清單文件中添加了相關的用戶權限行,如下所示,但我仍然沒有收到通知:
<uses-permission android:name="android.permission.WAKE_LOCK"/>
可能你沒有注冊通知通道,因為從Android 8.0(SDK 26)開始,你應該注冊一個通知通道,否則發送通知將永遠無法工作。
看這里: https : //developer.android.com/training/notify-user/channels
Caution: If you target Android 8.0 (API level 26) and post a notification without specifying a notification channel, the notification does not appear and the system logs an error.
創建通知通道很簡單,只需在調用NotificationManager.notify()
之前創建即可。 您可以參考該網頁下方的示例 ( https://developer.android.com/training/notify-user/channels )。
這是給 Kotlin 的
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
// Create the NotificationChannel
val name = getString(R.string.channel_name)
val descriptionText = getString(R.string.channel_description)
val importance = NotificationManager.IMPORTANCE_DEFAULT
val mChannel = NotificationChannel(CHANNEL_ID, name, importance)
mChannel.description = descriptionText
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(mChannel)
}
這是針對 Java 的
// Create the NotificationChannel, but only on API 26+ because
// the NotificationChannel class is new and not in the support library
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = getString(R.string.channel_name);
String description = getString(R.string.channel_description);
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
channel.setDescription(description);
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
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