The Logcat says that there is a 08-02 22:33:45.704: ERROR/AndroidRuntime(6918): java.lang.NullPointerException
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.mobilevideoeditor.moved.EditorView.onClick(EditorView.java:82), which is lv.setAdapter(new ArrayAdapter<String>(this,
R.layout.specialeffectsview, specialEffects)); but this would mean that R.layout.specialeffectsview doesn't exist, or? And it definitely does (below is the code I use for the specialeffectsview.xml) <?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/view_special_effects_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<ListView android:id="@+id/special_effects_list"
android:layout_height="wrap_content"
android:layout_width="fill_parent"></ListView>
</LinearLayout>
08-02 22:33:45.694: ERROR/AndroidRuntime(6918): Uncaught handler: thread main exiting due to uncaught exception
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): java.lang.NullPointerException
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.mobilevideoeditor.moved.EditorView.onClick(EditorView.java:82)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.View.performClick(View.java:2364)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.View.onTouchEvent(View.java:4179)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.View.dispatchTouchEvent(View.java:3709)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1695)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1116)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.app.Activity.dispatchTouchEvent(Activity.java:2068)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1679)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.view.ViewRoot.handleMessage(ViewRoot.java:1724)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.os.Looper.loop(Looper.java:123)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at android.app.ActivityThread.main(ActivityThread.java:4603)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at java.lang.reflect.Method.invokeNative(Native Method)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at java.lang.reflect.Method.invoke(Method.java:521)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-02 22:33:45.704: ERROR/AndroidRuntime(6918): at dalvik.system.NativeStart.main(Native Method)
On Mon, Aug 2, 2010 at 9:30 PM, Mark Murphy <mmurphy@commonsware.com> wrote:
If your error report is accurate, you are not setting lv to a value,
and so it is null.
--
On Mon, Aug 2, 2010 at 4:25 PM, kivy <victoriasarabusse@gmail.com> wrote:
> Hi
>
> I am trying to populate a ViewFlipper with a ListView when a certain
> button is clicked...but I only get a NullPointerException for
> lv.setAdapter(new ArrayAdapter<String>(this,
> R.layout.specialeffectsview, specialEffects));
>
> To be honest I don't really know how to do this, I just learned about
> the ViewFlipper today and I haven't fully understood how to use it
> yet. If anyone could help me find how what I have done wrong, that
> would be great.
>
> Thanks in advance.
>
> Here is the code I use:
>
> public void onClick(View v){
> if (v == btnExposure){
>
> mFlipper.setDisplayedChild(0);
>
> }
> else if (v == btnProperties){
> mFlipper.setDisplayedChild(1);
> }
>
> else if (v == btnSpecialEffects){
> mFlipper.setDisplayedChild(2);
> String[] specialEffects =
> getResources().getStringArray(R.array.special_effects_array);
> lv.setAdapter(new ArrayAdapter<String>(this,
> R.layout.specialeffectsview, specialEffects));
> lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
> }
>
> }
>
> --
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