We Keep Coding

Foreground service gets stopped after 1 minute (Android 12)

I'm trying to make a service that works 24/7 and it's been working until I updated to Android 12. I've checked the new foreground restrictions but still don't understand why it isn't working since I'm starting it from an activity.
ACTIVITY
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class TestActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
startForegroundService(new Intent(TestActivity.this, TestService.class));
}
}
SERVICE
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.media.MediaBrowserCompat;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
import androidx.media.MediaBrowserServiceCompat;
import java.util.List;
public class TestService extends MediaBrowserServiceCompat {
#Override
public BrowserRoot onGetRoot(#NonNull String clientPackageName, int clientUid, #Nullable Bundle rootHints) { return null; }
#Override
public void onLoadChildren(#NonNull String parentId, #NonNull Result<List<MediaBrowserCompat.MediaItem>> result) { result.sendResult(null); }
#Override
public int onStartCommand(Intent ii, int flags, int startId) {
//CREATE NOTI CHANNEL
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(
"test", "Test Notifications",
NotificationManager.IMPORTANCE_HIGH);
((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(channel);
}
//CREATE NOTI
Notification notification = new NotificationCompat.Builder(this, "test")
.setSmallIcon(R.drawable.icon)
.setContentTitle("title")
.setContentText("test")
.setChannelId("test")
.setOngoing(true)
.setSilent(true)
.build();
//START FOREGROUND
startForeground(101, notification);
return START_STICKY;
}
}
I tried creating a new app with just these lines of code and it works fine so it must be something else making the service close after a minute.

Turns out samsung put my app on deep sleep which caused it to close itself if not used for a minute. Also thanks to the people who took their time to try and help.

Even though you are correct in wanting a foreground Service here, it seems as if you want it to stay alive whenever you app in the background, or not running at all, as you don't intend your app to be running 24/7, do you?
Since it seems as if you're trying to use a MediaBrowserServiceCompat in your example, I would suggest you do so using a companion instance of a MediaSessionCompat in order to have the media session control the lifecycle of your Service on it's own.
Implementing a media Service is not the most straightforward task in Android; they're still trying to fix some of its prevailing issues with the latest release of Android 13. Therefore, I would also suggest you follow this official Android guide if you're attempting to create an audio app with a media foreground Service.

PDF file not opening using Android:OnClick

So I've managed to get a button to open a pdf file using an intent, however when i run the app and press the button it says "Cannot display PDF". Can anyone help me out as to where exactly the code goes wrong?
Here is the my activity:
package com.example.android.practiceapp;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import java.io.File;
public class promotions extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_promotions);
final Button button = (Button) findViewById(R.id.earlybird);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v){
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/pictures/Early_Bird_Bonus_Rules");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
Intent intent1 = Intent.createChooser(intent, "Open With");
try {
startActivity(intent1);
} catch (ActivityNotFoundException e) {
// Instruct the user to install a PDF reader here, or something
}
}
});
}
}

How do I get the NMEA data from a serial GPS connected to my android device?

I am working on a project where I have to connect my android device to a GPS with usb. I can't figure out how I can get the data out of my GPS and I do not want to use the device it's internall GPS because I need to be pretty accurate. I have read the tutorial on the android website and I have tried to work with it but I still do not understand how I have to make connection to the GPS.
Here is my code.
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import java.util.HashMap;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
UsbDevice device = deviceList.get("deviceName");
private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)){
if(device != null){
//roep hier de method aan om communicatie met he apparaat te maken
}
}
else{
Log.d(TAG, "permission denied for device " + device);
}
}
}
}
}
}

You might want to give this a shot: http://code.google.com/p/usb-serial-for-android/. Captures all serial data, does not require rooting. You would need to use Service. Let us know if you need more help. I have done this before, not on Android though.

Button link to facebook application

I have a button link to facebook account but it connect to Google browser in my mobile (as shown) but I don't want that, I want it to take me to facebook application in my mobile and if it doesn't exist, it takes me to Google play application to download/install facebook, does anybody know how?
package com.el.dom;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class PageAb extends Activity {
Button dclink;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ab);
addListenerOnButton();
}
public void addListenerOnButton() {
dclink= (Button) findViewById(R.id.dctec);
dclink.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.facebook.com/blah"));
startActivity(browserIntent);
}
});
}
}

use android facebook sdk create an app at http://developers.facebook.com/ and proceed

try {
//try to open page in facebook native app.
String uri = "fb://page/" + yourFBpageId; //Cutsom URL
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(intent);
}
catch (ActivityNotFoundException ex){
//facebook native app isn't available, use browser.
String uri = "http://touch.facebook.com/pages/x/" + yourFBpageId; //Normal URL
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(uriMobile));
startActivity(i);
}
copied from How to navigate user to a facebook page via Android's facebook api?

killBackgroundProcesses not working (for other app)

I'm trying to have my app turn off a music player using the code below:
import android.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
public class MyBroadcastReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);
ActivityManager activityManager = (ActivityManager)
context.getSystemService(Context.ACTIVITY_SERVICE);
String music = "com.sec.android.app.music";
activityManager.killBackgroundProcesses(music);
}
}
But it's only turning down the volume, not killing the application. I have added the appropriate permissions to the manifest and I'm targeting higher than API 8 Thanks.

You cannot kill other processes. Only system can do that. And volume goes down because its settings is not per app.