Get application instance returns null

Question

I have no ideas, but...

public class MyApplication extends MultiDexApplication {
    public MyApplication() {//for example, here
        instance = this;
    }

     @Override
    public void onCreate() { //or here
        instance = this;
        super.onCreate();
    }
}

in my activity

@Override
    protected void onPause() {//onStart, onCreate, etc 
        MyApplication.getInstance().doSomething();
        super.onPause();
    }

And in random moments I have the crash.

FATAL EXCEPTION: main
        Process: com.mypackage.myapplication, PID: 17579
        java.lang.RuntimeException: Unable to pause activity {com.mypackage.myapplication.MyFragmentActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.mypackage.myapplication.MyApplication.getInstance().doSomething()' on a null object reference

ie MyApplication.getInstance returns null! How do you think, what the... issue? Using debug in AndroidStudio 2.0

also I don't know, how to reproduce this issue manually – VKDev Jan 17 '16 at 11:16 — VKDev, Jan 17 '16 at 11:16
Have you defined the application in your manifest? – tynn Jan 17 '16 at 11:22 — tynn, Jan 17 '16 at 11:22
yep. this issue comes from case to case – VKDev Jan 17 '16 at 11:54 — VKDev, Jan 17 '16 at 11:54

score 2 · Answer 1 · answered Jan 17 '16 at 11:29

2

It looks like you want application context to perform some operations, I Don't know why you need your own application instance. Use getApplicationContext(); to get context

Another solution is to define your application class in your manifest under application tag

android:name=".MyApplication"

Comment below for any further information

answered Jan 17 '16 at 11:29

Manikanta

3,421
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Wow, bro! It seems like you saved my life. Adding app's name to manifest made a deal for me. Thank you so much! – Dmitry Smolyaninov Feb 18 '17 at 10:53

peeyush pathak · Answer 2 · 2016-01-18T02:40:37.973

1

don't keep the instance as static in application class. you can use

(MyApplication) getApplicationContext()

this will get you your application object.

just dont typecast the activity object to MainApplication class directly.

in case of Test case you can change it to getApplicationContext()

edited Jan 18 '16 at 02:40

answered Jan 17 '16 at 11:27

peeyush pathak

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Don't cast `getApplicationContext()` to `Application`. Use `getApplication()` instead. See http://stackoverflow.com/questions/5018545/getapplication-vs-getapplicationcontext – tynn Jan 17 '16 at 11:42

Get application instance returns null

2 Answers2