Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName() on getActivity()

Question

When I try to create an intent on my Fragment class to move my activity page HomeScreenActivity using,

Intent intent = new Intent(getActivity(), HomeScreenActivity.class);
startActivity(intent);
getActivity().finish();

I'm getting following error Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference on Fabric. I got this error on Galaxy S7 Edge with os version 7. While executing line Intent intent = new Intent(getActivity(), HomeScreenActivity.class); (Line number 338 on LoginFragment.java)

Here is the full log I got from on Fabric,

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
       at android.content.ComponentName.<init>(ComponentName.java:128)
       at android.content.Intent.<init>(Intent.java:5359)
       at com.example.android.fragments.LoginFragment.handleValidateEmployeeResponse(LoginFragment.java:338)
       at com.example.android.fragments.LoginFragment.access$100(LoginFragment.java:53)
       at com.example.android.fragments.LoginFragment$3.onResponse(LoginFragment.java:249)
       at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)
       at android.os.Handler.handleCallback(Handler.java:751)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:154)
       at android.app.ActivityThread.main(ActivityThread.java:6692)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

Possible duplicate of android.content.Context.getPackageName()' on a null object reference — John Joe
– John Joe, Commented Nov 29, 2017 at 7:10
Please show the entire handleValidateEmployeeResponse method — OneCricketeer
– OneCricketeer, Commented Nov 29, 2017 at 7:34

KeLiuyue · Accepted Answer · 2017-11-29 07:52:36Z

1

Try to use attach method

public Activity mActivity;

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    this.mActivity = activity;
}

And use like this

Intent intent = new Intent(mActivity, HomeScreenActivity.class);
startActivity(intent);
mActivity.finish();

answered Nov 29, 2017 at 7:52

KeLiuyue

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2 Comments

SHIDHIN TS Over a year ago

Let me try this method.

KeLiuyue Over a year ago

Good luck to [email protected]

IntelliJ Amiya · Accepted Answer · 2017-11-29 07:35:24Z

1

I did something like this,

Take Activity reference like

MainActivity activity = (MainActivity) getActivity();

Then pass the object where you want it, like

Intent intent = new Intent(activity , HomeScreenActivity.class);
activity.finish();

edited Nov 29, 2017 at 7:35

IntelliJ Amiya

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answered Nov 29, 2017 at 7:30

AgrePasyami

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1 Comment

OneCricketeer Over a year ago

getActivity() will still return null depending where it's used

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