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startForeground makes app crash (AndroidStudio) [duplicate]

This question already has answers here:
Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 2 years ago.
I want to make a foreground service that calls an Asynchrounic task every few seconds.
so I defined a foreground service like this:(I haven't added the task yet)
import android.app.Notification;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
import static com.example.notif.App.ID;
public class Service extends android.app.Service {
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
}
#Override
public void onDestroy() {
super.onDestroy();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Intent notificationIntent= new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,0,notificationIntent,0);
Notification notification = new NotificationCompat.Builder(this,ID)
.setContentTitle("Title")
.setContentText("Text")
.setSmallIcon(R.drawable.ic_android)
.setContentIntent(pendingIntent)
.build();
startForeground(2,notification);
return START_STICKY;
}
}
edited the manifest like this and added the service to it.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.notif">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application
android:name=".App"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:usesCleartextTraffic="true"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.Notif">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".Service"></service> //i added service here
</application>
</manifest>
and I start it with an onClickListener:
public void start(View view) {
Intent serviceIntent = new Intent(this,Service.class);
startService(serviceIntent);
}
when I press the button the app crashes. what am I doing wrong? how should I proceed?

If your app targets API level 26 or higher and you want to create foreground service you should call startForegroundService() instead of startService()

You should use ContextCompat.startForegroundService() because it automatically handles post and pre Oreo behavior like below
public static void startForegroundService(#NonNull Context context, #NonNull Intent intent) {
if (Build.VERSION.SDK_INT >= 26) {
context.startForegroundService(intent);
} else {
// Pre-O behavior.
context.startService(intent);
}
}
Also add the permission
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
Apps that target Android 9 (API level 28) or higher and use foreground services must request the FOREGROUND_SERVICE permission
Note: If an app that targets API level 28 or higher attempts to create a foreground service without requesting the FOREGROUND_SERVICE permission, the system throws a SecurityException.

Background service on Ionic 2 geofence won't trigger

I'm working on an Ionic app that requires geofence to run in the background. I'm using the cordova-plugin-geofence plugin. I understand that JavaScript does not run in the background and that the plugin developer provided native code to listen to geofence transitions.
I followed the instructions but it doesn't seem to work. Transition does not trigger when the app is closed.
Here is my package name: io.ionic.pla.
I placed this code below in my Android Manifest
<receiver android:name="io.ionic.pla.TransitionReceiver">
<intent-filter>
<action android:name="com.cowbell.cordova.geofence.TRANSITION" />
</intent-filter>
</receiver>
Here is my TransitionReceiver.java
package io.ionic.pla;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import com.cowbell.cordova.geofence.Gson;
import com.cowbell.cordova.geofence.GeoNotification;
public class TransitionReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String error = intent.getStringExtra("error");
if (error != null) {
//handle error
Log.println(Log.ERROR, "YourAppTAG", error);
} else {
String geofencesJson = intent.getStringExtra("transitionData");
Log.println(Log.INFO, "xxxYourAppTAG", geofencesJson);
GeoNotification[] geoNotifications = Gson.get().fromJson(geofencesJson, GeoNotification[].class);
//handle geoNotifications objects
}
}
}
Please help guys, I really need this to work.

starting an app after User_Present Action - not working

I would like to make an app that starts up every time the device is unlocked.
I'm new to Android and although I've read dozens of answers and the documentation there are just too many moving parts that I'm having a hard time troubleshooting.
Here is what I have ...
Structure
app
- manifests
-- AndroidManifest.xml
- java
-- DisplayMessageActivity.java
-- MainActivity.java
- res
- UnlockReceiver.java
This is in in my AndroidManifest.xml
<receiver android:name="UnlockReceiver">
<intent-filter>
<action android:name="android.intent.action.USER_PRESENT" />
</intent-filter>
</receiver>
This is my UnlockReceiver.java class
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import com.xywebsolutions.myapplication.MainActivity;
public class UnlockReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent myIntent = new Intent(context, MainActivity.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(myIntent);
}
}
What am I doing wrong? Is it my Structure? Do I need to add permissions before adding the receiver?

You don't need any broadcast to start/stop video.
You can use onResume() of activity lifecycle to start video. onResume will be called when activity becomes visible to user.
onPause() of activity to pause the video. You can also save current play position and start from that position when activity started again using onSaveInstanceState() function
For your case you can try this
#Override
public void onReceive(Context context, Intent intent) {
//start activity
Intent i = new Intent();
i.setClassName("com.test", "com.test.MainActivity");
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}

two changes and this issue was fixed:
1) The "UnlockReceiver" was moved into the java folder
app
- manifests
-- AndroidManifest.xml
- java
-- DisplayMessageActivity.java
-- MainActivity.java
-- UnlockReceiver.java
- res
And
2) The receiver in the manifest needed android:exported="true" ...
<receiver android:name="UnlockReceiver" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.USER_PRESENT" />
</intent-filter>
</receiver>

Service not starting when button is pressed?

I know this has been asked a million times before, but nothing is working for me. I have a service in a separate class that needs to be started when a button is pushed, after an application is launched from a LaunchIntent.
Long story short, here's my goal:
run commands>wait three seconds for commands to run>launch app>start service
The service is to monitor for the CONFIGURATION_CHANGED broadcast.
Manifest (the parts that matter):
</activity>
<receiver android:name="MyReceiver" >
<intent-filter>
<action android:name="android.intent.action.CONFIGURATION_CHANGED" >
</action>
</intent-filter>
</receiver>
<service android:enabled="true" android:name=".MyService" />
</application>
</manifest>
MyService.java:
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
import android.app.Service;
public class MyService extends Service {
String[] commandsdefault = {"/x"};
public void onCreate() {
Toast.makeText(this, "x", Toast.LENGTH_SHORT);
}
public void onDestroy() {
Toast.makeText(this, "x", Toast.LENGTH_SHORT);
}
public void onReceive(Context context, Intent intent) {
MainActivity ogres = new MainActivity();
ogres.RunAsRoot(commandsdefault);
}
#Override
public void onStart(Intent intent, int startid) {
Toast.makeText(this, "x", Toast.LENGTH_SHORT);
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
}
And then I simply have the following line in my MainActivity.java to call the service to start:
startService(new Intent(getApplicationContext(), MyService.class));
I am more confused than a mosquito in a mannequin shop. LogCat is returning absolutely nothing helpful other than u=0 not found.
Do I have something incorrect here? I'm not even seeing toasts from the service starting.

Make sure your service is declared in Android manifest

try to Override the onStartCommand() method of your service. hope this helps

Try specifying the full name of your service as the android:name attribute (e.g. android:name="com.example.MyService")

Ok, solved my own question.
MyService was running the whole time! I just didn't see the toast notifications to alert me when it started. Now I have a monitor in my main Activity that posts a toast when the service is started/killed, rather than using MyService itself to post toasts.

PreferenceActivity and BroadcastReceiver - Implement dynamic preferences

I'm going by the following code example to dynamically build a preference activity.
http://www.linuxtopia.org/online_books/android/devguide/guide/samples/ApiDemos/src/com/example/android/apis/app/PreferencesFromCode.html
The preference dialog shows, but I'm not able to see any changes after closing it.
Here's where I'm defining the activity in AndroidManifest.xml
<activity
android:name="PreferencesActivity" android:label="#string/preferences_name">
</activity>
Here's where I'm defining the receiver.
<receiver
android:name="FroyVisualReceiver"
android:label="#string/app_name"
android:exported="false">
<intent-filter>
<action android:name="com.starlon.froyvisuals.PREFS_UPDATE"/>
</intent-filter>
</receiver>
And here's the BroadcastReceiver. I never see the "WTF" in logcat. What am I doing wrong?
package com.starlon.froyvisuals;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.util.Log;
public class FroyVisualsReceiver extends BroadcastReceiver
{
#Override
public void onReceive(Context context, Intent intent)
{
Log.e("WTFWTF", "WTFWTFWTFW");
String action = intent.getAction();
if(action.equals("com.starlon.froyvisuals.PREFS_UPDATE"))
{
((FroyVisuals)context).updatePrefs();
}
}
}
Oh here's onPause where I'm broadcasting the PREFS_UPDATE intent.I do see the logcat message. This method is part of my PreferenceActivity.
/** another activity comes over this activity */
#Override
public void onPause()
{
Log.i(TAG, "onPause ================================ ");
super.onPause();
Intent i = new Intent(this, FroyVisualsReceiver.class);
i.setAction("com.starlon.froyvisuals.PREFS_UPDATE");
sendBroadcast(i);
}
Edit: I think it may have to do with this line. 'this' points to my PreferenceActivity.
Intent i = new Intent(this, FroyVisualsReceiver.class);

Try a simple Intent:
Intent i = new Intent();
i.setAction("com.starlon.froyvisuals.PREFS_UPDATE");
sendBroadcast(i);