Get application context returns null

Question

The following schema has been touted as the way to get application context from anywhere within my android app. But sometimes doing MyApp.getContext() returns n

Answer 1

Create in onCreate() an instance of getApplicationContext() (mContext) then call MyApp.getContext() from everywhere in your app and you will get your application context statically.

public class MyApp extends Application {
 //private static MyApp instance;
 private static Context mContext;

    public static MyApp getInstance() {
        return instance;
    }

    public static Context getContext() {
      //  return instance.getApplicationContext();
      return mContext;
    }

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

Remember to declare into your AndroidManifest.xml

<application android:name="com.mypackage.mypackage.MyApp">
...
...
...
</application>

Answer 2

Create a static instance of the Context in your OnCreate and keep it till you want to get it from a getter method getContext()

From the Application class:

public class MyApp extends Application {

private static Context sContext;
@Override
public void onCreate() {
    sContext = getApplicationContext();
    super.onCreate();
}

public static Context getContext() {
    return sContext;
}
}

Declare it in your Manifest:

<application android:name="com.package.name.MyApp">

Answer 3

Another root cause, is due to the buggy backup process. Please refer to

Why backup related process might cause Application's onCreate is not executed?

Answer 4

instance is never initialized and so has a default value of null. This means that instance.getContext() will throw a NullPointerException. To fix this, you need to initialize the instance variable.

Answer 5

Currently, you have not initialized instance and by default it's value would now be set to null. You need to assign it a value before you can use it.

Answer 6

Use the following way to get the Application context.

public class MyApp extends Application {
    private static MyApp mAppInstance=null;
    public static Context appContext;
    public static MyApp getInstance() {
        return mAppInstance;
    }
    public static MyApp get() {
        return get(appContext);
    }
    public static MyApp get(Context context) {
        return (MyApp) context.getApplicationContext();
    }
    @Override
    public void onCreate() {
        super.onCreate();
        mAppInstance=this;
        appContext=getApplicationContext();

    }
}

add the the application name inside the Manifest file

<application android:name="packagename.MyApp"/>

to get the context use MyApp.getInstance().getApplicationContext()