I want to implement simple Gridview custom adapter in my fragment . but i got below error :
04-15 11:35:21.064 1190-1190/amir.com.unnamed E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{amir.com.unnamed/amir.com.unnamed.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at amir.com.unnamed.fragments.chooseCardFragment.onCreateView(chooseCardFragment.java:28)
at android.app.Fragment.performCreateView(Fragment.java:1695)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
at android.app.BackStackRecord.run(BackStackRecord.java:682)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
at android.app.Activity.performStart(Activity.java:5142)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
and my fragment code :
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.choose_card_fragment, container, false);
GridView cardsGrid = (GridView) getActivity().findViewById(R.id.choosecardsGridview);
cardsGrid.setAdapter(new cardAdapter(rootView.getContext()));
return rootView;
}
and custom adapter code :
public class cardAdapter extends BaseAdapter {
Context context;
private Integer[] mThumbIds = {
R.drawable.img, R.drawable.img3,
R.drawable.img4, R.drawable.img5,
R.drawable.img6, R.drawable.img7,
R.drawable.img2
};
public cardAdapter(Context c) {
this.context = c;
}
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imga;
if (convertView == null) {
imga = new ImageView(context);
imga.setLayoutParams(new GridView.LayoutParams(85, 85));
imga.setScaleType(ImageView.ScaleType.CENTER);
imga.setPadding(8, 8, 8, 8);
} else {
imga = (ImageView) convertView;
}
imga.setImageResource(mThumbIds[position]);
return imga;
}
}
I don't have any idea where I make a mistake . thank's for any help .
If you are doing
View rootView = inflater.inflate(R.layout.choose_card_fragment, container, false);
Shouldn't
GridView cardsGrid = (GridView) getActivity().findViewById(R.id.choosecardsGridview);
actually be
GridView cardsGrid = (GridView) rootView.findViewById(R.id.choosecardsGridview);
?
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