Android start Activity From Fragment Crash

Question

I am trying this code to start a activity from a Fragment by adding this code but the app crashes here

Intent i = new Intent(getActivity(), IsActive.class);
startActivity(i);
getActivity().finish();

this is my error log :

FATAL EXCEPTION: main                                                                        Process: media.aer.influencer, PID: 16165
  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:4459)
  at media.aer.influencer.Activity.MarkAsActiveFragment$10.onResponse(MarkAsActiveFragment.java:396)
  at media.aer.influencer.Activity.MarkAsActiveFragment$10.onResponse(MarkAsActiveFragment.java:333)
  at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:67)
  at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
  at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
  at android.os.Handler.handleCallback(Handler.java:746)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:148)
  at android.app.ActivityThread.main(ActivityThread.java:5443)
  at java.lang.reflect.Method.invoke(Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

What am I doing wrong ??

This one, in particular https://stackoverflow.com/a/27678112/2308683 — OneCricketeer, Sep 08 '17 at 09:17

score 1 · Answer 1 · answered Sep 08 '17 at 09:09

1

Whenever you are dealing with fragments then you should use getContext() to get the Activity.

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

answered Sep 08 '17 at 09:09

Hector Morris

118
5

What about `getActivity().finish()`? – OneCricketeer Sep 08 '17 at 09:10
1

In some cases the getActivity() will return null or gives error in that case avoid call of `finish()` . – Hector Morris Sep 08 '17 at 09:13

score 0 · Answer 2 · answered Sep 08 '17 at 09:02

0

Instead of getActivity()

Use YourActivityName.getActivity();

in both the places

Like

private HomeActivity csActivity;
csActivity = (HomeActivity) getActivity();

so you can use csActivity instead of getActivity()

answered Sep 08 '17 at 09:02

Anil

1,605
1
14
24

How does storing the Activity reference help? That's just going to cause a memory leak – OneCricketeer Sep 08 '17 at 09:07
try to use getContext() – Anil Sep 08 '17 at 09:07
Are you guessing? – OneCricketeer Sep 08 '17 at 09:08
getContext() i am guessing – Anil Sep 08 '17 at 09:08
Declare your Intent i = new Intent(getActivity(), IsActive.class); startActivity(i); getActivity().finish(); in main activity class and call function from your fragemets coool – Anil Sep 08 '17 at 09:09
getActivity() isn't a method in the Activity class – OneCricketeer Sep 08 '17 at 09:11
then use youractivity.this in activity classs – Anil Sep 08 '17 at 09:23

Android start Activity From Fragment Crash

2 Answers2