Develop Reference

starting background service while phone turn on with example code

I need an app which will run always in the background and apps will start while phone is turn on. Please help me with example code.
I already tried several code but it run on background while pressing button after start the apps

You need to receive BOOT_COMPLETED of the phone, then start the service.
Follow the following steps
Step 1: create your service
public class myService extends Service{
public myService(){}
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
}
}
Step 2: Create your boot receiver
public class BootReceiver extends BroadcastReceiver {
public void onReceive(final Context context, Intent intent) {
Intent i = new Intent(context, RemindersService.class);
context.startService(i);
}
}
Step 3: add them to manifest inside application
<service
android:name=".services.RemindersService"
android:enabled="true"
android:exported="true" />
<receiver
android:name=".services.BootReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
Step 4: add permission in manifest
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
Thats it. Happy coding.
Please note that in android Oreo, you will want to start service as foreground
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(i);
}

How to call the Intent from a class in service

I have a service. In the service, I will call a function in class. The function allows opening an Intent
My service is
public class service extends Service
{
private static final String TAG = "MyService";
#Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
public void onDestroy() {
Log.d(TAG, "onDestroy");
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
return START_STICKY;
}
}
And my class is
public class classIntent extends Application{
public void homeIntent()
{
Intent intent1 = new Intent(Intent.ACTION_MAIN);
intent1.addCategory(Intent.CATEGORY_HOME);
intent1.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent1.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent1);
}
In the service, I will call homeIntent() function as follows steps:
In the onCreate() of the service, I will use
private classIntent cIntent;
#Override
public void onCreate() {
cIntent=new classIntent();
...}
Then in the onStartCommand() function, I used
cIntent.homeIntent();
However, I got the error such as:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.Context.startActivity(android.content.Intent)' on a null object reference
How can I solve it? Do I right when my class classIntent extended from Application? I want to use some functions in the class such as: getApplicationContext()...If not correct, which class do I need to extend? I am running the app in the background. Thank all
My manifest is
<application android:label="#string/app_name"
<activity android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<service android:enabled="true" android:name=".service" />
<activity android:enabled="true" android:name=".classIntent" />
</application>

You really not need to do this way, and it is very wrong.
Your class name code-style is not good, should be ClassName
<activity android:enabled="true" android:name=".classIntent" /> classIntent is not a Activity in you code.
you just need to:
use getApplication().startActivity() to do the work, getApplication() is a function Service, Activity has, if you only need the Application context, not some activities.
If you need to make code clear, I suggest a static makeIntent function you can put in your helper class or the class associate with the intent.
the code in Service only need call getApplication().startActivity(XXX.makeIntent())

get access to running activity in parse push notification custom receiver

I have an application that use parse push notification service. Here is the class that I'm using for receiving notification:
public class MessageReceiver extends ParsePushBroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
//...some code in here
}
And I also register this custom receiver in my manifest:
<receiver
android:name="com.package.MessageReceiver"
android:exported="false" >
<intent-filter>
<action android:name="com.parse.push.intent.RECEIVE" />
<action android:name="com.parse.push.intent.DELETE" />
<action android:name="com.parse.push.intent.OPEN" />
</intent-filter>
</receiver>
Everything is fine with notification system. After a notification have received, I want to update the running activity UI accordingly (like showing an icon for new notification) but I don't have access to the activity object in onReceive method. What is the best practice to do that? I couldn't use the context object in this matter.
Thanks

I believe you can accomplish this by using a BroadcastReceiver.
You would define the receiver in the activities you want to have access to,
See snippet below.
public MyActivity extends Activity
{
//... code
private BroadcastReceiver receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//... update ui here
}
};
#Override
protected void onResume() {
IntentFilter filter = new IntentFilter();
filter.addAction("suitablename");
registerReceiver(receiver, filter);
super.onResume();
}
#Override
protected void onPause() {
unregisterReceiver(receiver);
super.onPause();
}
//... code
}
Then in your custom receiver send the broadcast.
public class MessageReceiver extends ParsePushBroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
//...some code in here
Intent intent = new Intent();
intent.setAction("suitablename");
context.sendBroadcast(intent);
}
}
Don't forget to update the manifest
<activity
android:name=".MyActivity" >
<intent-filter>
<action android:name="suitablename"></action>
</intent-filter>
</activity>

NotificationListenerService not working - even after giving permission

Below is my code to capture notifications. I dont understand why the onNotificationPosted is not getting fired.
I am giving my app Notifications access from Settings > Security and the onCreate from MyNotifService is also getting fired, but onNotificationPosted is not getting fired.
What am I missing or doing wrong?
From my MainActivity's onCreate() function:
Intent intent = new Intent(this, MyNotifService.class);
this.startService(intent);
My Service code that extends NotificationListenerService:
#SuppressLint("NewApi")
public class MyNotifService extends NotificationListenerService {
#Override
public void onNotificationPosted(StatusBarNotification sbn) {
super.onNotificationPosted(sbn);
Log.v("focus", "in onNotificationPosted() of MyNotifService");
}
#Override
public void onCreate() {
super.onCreate();
Log.v("focus", "in onCreate() of MyNotifService");
}
}
In the manifest file, I have this:
<service android:name="com.mavdev.focusoutfacebook.notifications.MyNotifService"
android:label="#string/app_name"
android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE" >
<intent-filter>
<action android:name="android.service.notification.NotificationListenerService" />
</intent-filter>
</service>

It does seem to be a bit flakey, but this is the actual fix in this case:
#Override
public IBinder onBind(Intent intent) {
return super.onBind(intent);
}

I've been trying to get it working for the second day, and I succeeded. Try adding these lines at the end of onStartCommand method.
And, it hardly plays a role, but try to declare your service after activities in the manifest file.
This comment with sample code was really helpful to me: https://stackoverflow.com/a/41521664/10652152

Why do dynamically register broadcast receiver didn't work after reboot

I have a onBootCompleted broadcast receiver registered in the manifest.
It runs starts MyService. My service in the onCreate registers 3 more broadcast receivers dynamically.
The 3 new receivers filter on the following intent actions
LOCALE_CHANGED,
TIMEZONE_CHANGED and
CONNECTIVITY_CHANGED.
These works correctly when I run the application from Eclipse but, after I reboot the device and my service starts up none of receivers work.
I have a work around implementation but, I would like to know why this is happening?
Manifest:
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<receiver android:name=".receiver.BootCompletedReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.HOME" />
</intent-filter>
</receiver>
<service
android:name=".MyService"
android:enabled="true"
android:exported="false"
android:stopWithTask="false" >
</service>
Service:
public class MyService()
{
LocationTimeZoneC‌​hangedReceiver mLocationTimeZoneC‌​hangedReceiver = new LocationTimeZoneC‌​hangedReceiver()
NetworkChangedReceiver mNetworkChangedReceiver = new NetworkChangedReceiver()
public void onCreate()
{
registerReceiver(mLocationTimeZoneChangedReceiver, new IntentFilter(Intent.ACTION_LOCALE_CHANGED));
registerReceiver(mLocationTimeZoneC‌​hangedReceiver, new IntentFilter(Intent.ACTION_TIMEZONE_CHANGED));
registerReceiver(mNetworkChangedReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
}
BootCompletedReceiver:
public class BootCompletedReceiver extends BroadcastReceiver
{
public void onReceive(Context context, Intent intent){}
}
MyApplication:
public class MyApplication extends Application
{
ServiceConnection mServiceConnection = new ServiceConnection() { anonymous class...}
public void onCreate()
{
bindService(new Intent(this, MyService.class), mServiceConnection,Context.BIND_AUTO_CREATE);
}
}
Edited:
Edited code for Plinio.Santos.
It's a big app with many moving parts so at best I can post small code snippets.
Following are the steps I am following for testing:
Push app via Eclipse,
test that network change receiver is working
leave wifi off
Now restart the device
wait for the process to start and turn on wifi.

I believe that the service is not started or bound due errors. Unfortunately I can not say it for sure without all binding/starting code.
Anyway, you can see bellow a code that worked fine after I rebooted (the app started, registered the receiver and is receiving the CONNECTIVITY_CHANGED broadcast.
AndroidManifest.xml:
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<receiver android:name=".TestReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<service
android:name=".TestService"
android:exported="true" />
Receiver class:
public class TestReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent != null && Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
Toast.makeText(context, "Intent.ACTION_BOOT_COMPLETED receiverd !", Toast.LENGTH_SHORT).show();
context.startService(new Intent(context, TestService.class));
}
}
}
Service class:
public class TestService extends Service {
private BroadcastReceiver mConnectivityChangedReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (intent != null && ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
Toast.makeText(context, "ConnectivityManager.CONNECTIVITY_ACTION receiverd !", Toast.LENGTH_SHORT).show();
}
}
};
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
registerReceiver(mConnectivityChangedReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
}