CODEWITHSUNDEEP
javaandroidandroid-fragments
suheb
suheb

Reputation: 1649

Android- Animation within Fragment

I am trying to animate some Buttons in a Fragment but I keep getting the FATAL EXCEPTION: main error. I'm using the AnimationUtils class to load animations.

Here's my Fragment's code::

public class StartFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView=inflater.inflate(R.layout.fragment_start, container, false);
        Button button1 = (Button) getActivity().findViewById(R.id.button1);
        Button button2 = (Button) getActivity().findViewById(R.id.button2);
        Animation slideIn = AnimationUtils.loadAnimation(getActivity(), R.anim.slide_in);
        button1.startAnimation(slideIn);
        button2.startAnimation(slideIn);
        return rootView;
    }  
}

I also tried running the animation from the Activity that host this fragment but that didnt work either.

Is it even possible to run animations in a fragment?

EDIT:

slide_in.xml

<?xml version="1.0" encoding="utf-8"?><translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator"
    android:fromXDelta="-100%"
    android:toXDelta="0%" />

Logcat :

12-03 21:41:05.843: E/AndroidRuntime(9841): FATAL EXCEPTION: main

12-03 21:41:05.843: E/AndroidRuntime(9841): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lostbeatlive/com.lostbeatlive.LoginActivity}: java.lang.NullPointerException 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2281) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.ActivityThread.access$600(ActivityThread.java:148) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1263) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.os.Handler.dispatchMessage(Handler.java:99) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.os.Looper.loop(Looper.java:137) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.ActivityThread.main(ActivityThread.java:5124) 12-03 21:41:05.843: E/AndroidRuntime(9841): at java.lang.reflect.Method.invokeNative(Native Method) 12-03 21:41:05.843: E/AndroidRuntime(9841): at java.lang.reflect.Method.invoke(Method.java:525) 12-03 21:41:05.843: E/AndroidRuntime(9841): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 12-03 21:41:05.843: E/AndroidRuntime(9841): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 12-03 21:41:05.843: E/AndroidRuntime(9841): at dalvik.system.NativeStart.main(Native Method) 12-03 21:41:05.843: E/AndroidRuntime(9841): Caused by: java.lang.NullPointerException 12-03 21:41:05.843: E/AndroidRuntime(9841): at com.lostbeatlive.StartFragment.onCreateView(StartFragment.java:21) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.Activity.performStart(Activity.java:5217) 12-03 21:41:05.843: E/AndroidRuntime(9841): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2204) 12-03 21:41:05.843: E/AndroidRuntime(9841): ... 11 more

Upvotes: 2

Views: 2993

Answers (1)

Martin
Martin

Reputation: 4836

In a fragment, you use CreateView to set things up. The view created is where you get the findViewById. Instead of:

    View rootView=inflater.inflate(R.layout.fragment_start, container, false);
    Button button1 = (Button) getActivity().findViewById(R.id.button1);
    Button button2 = (Button) getActivity().findViewById(R.id.button2);

Try this:

    View rootView=inflater.inflate(R.layout.fragment_start, container, false);
    Button button1 = (Button) rootView.findViewById(R.id.button1);
    Button button2 = (Button) rootView.findViewById(R.id.button2);

Upvotes: 1

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