custom android.app.Application not firing onCreate event

Question

I'm deriving a custom application from android.app.Application and I can't get its onCreate event being fired. Here's the implementation

import android.app.Application;

public class MyApplication extends Application {

    public MyApplication() {
        super();
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }
}

And here's how I'm using it:

MyApplication ctrl = new MyApplication();

Answer 1

Add following in your AndroidManifest.xml

<application
    android:name="MyApplication"
    android:debuggable="true"
    android:icon="@drawable/icon"
    android:label="@string/app_name">
</application>

then your onCreate() will get fired.

Answer 2

I had this issue and found that in my case that the whole issue was phone side. I rebooted the phone and that fixed the issue.

Answer 3

Very simple

In your AndroidManifest.xml, within the application tag enter the name of your Application sub-class with it's path under the android:name attribute.

Example:

<application
...
android:name=".models.custom.BaseApplication"
...
> ... </application>

Answer 4

You don't actually create instances of your Activities with the newoperator. Instead you start an Intent like this:

Intent start = new Intent(context, Classname.class);
context.startActivity(start);

When creating an object with the new operator, then onCreate never will be called.

[EDIT] When creating Applications with the new operator onCreate won't be called either[/EDIT]

[EDIT2] You could create a static method that returns the application like this:

public static MyApplication getApp() {
    return mInstance;
}

[/EDIT2]

Answer 5

In Manifest file Make sure u have added the tag i.e class which extends Application.

Tag= android:name=".MyApplication

ManifestFile

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.services">
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Services">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!--Declaring the Service in the manifest file-->
        <service
            android:name=".MyServiceDemo"
            android:foregroundServiceType="dataSync" />
    </application>
</manifest>

MyApplication.java(i.e class which extends Applicatoin)

package com.example.services;

import android.app.Application;

public class MyApplication extends Application {

    private static MyAppsNotificationManager notificationManager;

    @Override
    public void onCreate() {
        super.onCreate();
        notificationManager = MyAppsNotificationManager.getInstance(this);
        notificationManager.registerNotificationChannelChannel(
                getString(R.string.channelId),
                "BackgroundService",
                "BackgroundService");
    }

    public static MyAppsNotificationManager getMyAppsNotificationManager(){
        return notificationManager;
    }
}

Answer 6

Don't construct it, get it from Context.

For example from Activity:

MyApplication ctrl = (MyApplication)getApplicationContext();

More info: Context.getApplicationContext()

Documentation says that onCreate() is

Called when the application is starting, before any other application objects have been created

Answer 7

As Balaji Mentioned if your still facing issue even after mentioning class name under application tag

<application
    android:name="MyApplication"
    android:debuggable="true"
    android:icon="@drawable/icon"
    android:label="@string/app_name"> </application>

Then try this:

Try and disabling Instant Run and then clean project and Rebuild it and then run again. It worked for me. Thanks.

Answer 8

My problem was that I needed to log something and it wasn't called Application onCreate().

If you have the same problem and need some Side Effects to trigger like Analytics events. Use these 2 approaches.

Don't put your main logic (for example don't initialize the libraries) in the below places.

Approach 1: Override onCreate of your Application Class like below:

     @OptIn(DelicateCoroutinesApi::class)
     override fun onCreate() {
        GlobalScope.launch {
          ProcessLifecycleOwner.get().lifecycle.withCreated {
            // Here onCreate of the Application will be called !
          }
        }
        super.onCreate()
      }

Approach 2: Create a class for example named AppLifecycleListener that implements DefaultLifecycleObserver and override required methods.

@Singleton
class AppLifecycleListener @Inject constructor() : DefaultLifecycleObserver {

override fun onCreate(owner: LifecycleOwner) {
    super.onCreate(owner)
    // Here onCreate of the Application will be called !
   }
}

Don't forget to addObserver() your class in Application

@Inject
lateinit var appLifecycleListener: AppLifecycleListener

override fun onCreate() {
    super.onCreate()
    ProcessLifecycleOwner.get().lifecycle.addObserver(appLifecycleListener)
}