Before I begin, I want to make clear that I have read previous answers to similar topics (mainly this one) and the answer given even in the comments didn't work for me (adding the intent != null before intent.getAction() didn't work).
I'm trying to make a foreground service for a Mayan Horoscope. The purpose of the service is to read the horoscope symbols and a prediction from an SQLite Database and whenever it recieves a text message with the following: "MAYA dd/MM/yyyy" (the DOB), the service would obtain the info and send a text message automatically. I have gotten that to work as a background service without error, but I want to give it a notification so the user can see if the service is running or not.
I have followed other tutorials (tutorial 1 and tutorial 2) to make the foreground service and it works fine without error.
My problem now is that whenever I start the service, stop the service and finally clear the ram (killing the app) I get the Nullpointer Exception all the time on my service's Line 57 (no matter what code I have it's always line 57). On my phone it gives me the message "Unfortunately HoroscopoMaya has stopped working." TWICE!
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".ServicioAstralMaya"
android:exported="false" />
</application>
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
MainActivity.java:
public void startService( View view )
{
if( bRunning == false )
{
Intent intent = new Intent( MainActivity.this, ServicioAstralMaya.class );
intent.setAction( Constants.ACTION.START_FOREGROUND_ACTION );
startService( intent );
txtVStatServ.setText( "INVOCADOS " );
bRunning = true;
}
}//END startService( View )
public void stopService( View view )
{
if( bRunning == true )
{
Intent intent = new Intent( MainActivity.this, ServicioAstralMaya.class );
intent.setAction( Constants.ACTION.STOP_FOREGROUND_ACTION );
startService( intent );
txtVStatServ.setText( "DESCANSANDO " );
bRunning = false;
}
}//END stopService( View )
ServicioAstralMaya.java (service):
@Override
public int onStartCommand( Intent intent, int flags, int startID )
{
if( intent != null && intent.getAction().equals( Constants.ACTION.START_FOREGROUND_ACTION
) )
{
Log.i( TAG, "Servicio iniciado!" );
isRunning = true;
startForeground( Constants.NOTIFICATION_ID.SERVICE_ID, getCompatNotification() );
}else if( intent != null && intent.getAction().equals( Constants.ACTION.STOP_FOREGROUND_ACTION ) )
{
Log.i( TAG, "Servicio detenido!" );
isRunning = false;
stopForeground( true );
stopSelf();
}
return START_STICKY;
}
private Notification getCompatNotification()
{
NotificationCompat.Builder builder = new NotificationCompat.Builder( this );
builder.setSmallIcon( R.drawable.homonculus_32 )
.setContentTitle( "Horoscopos Maya" )
.setTicker( "Astros Conectados" )
.setWhen( System.currentTimeMillis() );
Intent startIntent = new Intent( this, MainActivity.class );
PendingIntent contentIntent = PendingIntent.getActivity( this, 0, startIntent,
0 );
builder.setContentIntent( contentIntent );
Notification notification = builder.build();
return notification;
}//END Notification getCompatNotification()
@Override
public void onDestroy()
{
super.onDestroy();
isRunning = false;
}
Constants.java
public interface ACTION
{
public static final String START_FOREGROUND_ACTION = "edu.ito.jmhg" +
".horoscopomaya.action.START_FOREGROUND";
public static final String STOP_FOREGROUND_ACTION = "edu.ito.jmhg" +
".horoscopomaya.action.STOP_FOREGROUND";
}
public interface NOTIFICATION_ID
{
public static final int SERVICE_ID = 1;
}
Line 57 is this: Log.i( TAG, "Servicio iniciado!" );
The isRunning and bRunning is to check if the service is running so as to show the status in the MainActivity:
bRunning = isServiceRunning( ServicioAstralMaya.class );
private boolean isServiceRunning( Class<?> serviceClass )
{
ActivityManager manager = (ActivityManager)getSystemService( Context.ACTIVITY_SERVICE );
for( ActivityManager.RunningServiceInfo service : manager.getRunningServices( Integer
.MAX_VALUE ) )
{
if( serviceClass.getName().equals( service.service.getClassName() ) ) {
return true;
}
}
return false;
}//END boolean isServiceRunning( Class<?> )
and in the service: public static boolean isRunning;
I have even tried calling the stopService and doing the stopForeground(true); and stopSelf(); in the onDestroy() method but still to no avail. And the error is STILL line 57 of my service class.
Logcat:
FATAL EXCEPTION: main
Process: edu.ito.jmhg.horoscopomaya, PID: 21642
java.lang.RuntimeException: Unable to start service edu.ito.jmhg.horoscopomaya.ServicioAstralMaya@426d11c8 with null: java.lang.NullPointerException
...
Caused by: java.lang.NullPointerException at edu.ito.jmhg.horoscopomaya.ServicioAstralMaya.onStartCommand(ServicioAstralMaya.java:57)
I am running Android KitKat 4.4.4 (API 19) with Android Studio 2 using a rooted Samsung Grand Prime.
EDIT
I don't know if this is somewhat relevant, but I did notice something about Android Studio. No matter what changes I make, when I run the app I get notified that "No changes to deploy"
Event Log:
19:32:47 Executing tasks: [:app:assembleDebug]
19:33:50 Gradle build finished in 1m 3s 59ms
19:33:51 No changes to deploy
I've changed the code of my service and the line error is still 57, which is now ) ) right after if( intent.getAction().equals( Constants.ACTION.START_FOREGROUND_ACTION
ServicioAstralMaya.java (service):
@Override
public int onStartCommand( Intent intent, int flags, int startID )
{
if( intent != null && intent.getAction() != null )
{
if( intent.getAction().equals( Constants.ACTION.START_FOREGROUND_ACTION
) )
{
Log.i( TAG, "Servicio iniciado!" );
isRunning = true;
startForeground( Constants.NOTIFICATION_ID.SERVICE_ID, getCompatNotification() );
}else if( intent.getAction().equals( Constants.ACTION.STOP_FOREGROUND_ACTION ) )
{
Log.i( TAG, "Servicio detenido!" );
isRunning = false;
stopForeground( true );
stopSelf();
}
}
return START_STICKY;
}
Also, since I've changed to Android 2 my gradle updated and I had this weird error where I had to change the buildToolsVersion in build.gradle from buildToolsVersion "24.0 rc2" to buildToolsVersion "23.0.2"
build.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "edu.ito.jmhg.horoscopomaya"
minSdkVersion 19
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
}
