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POAndroid TextView NullPointerException with onTouchListener and onClickListener on 4.0
 

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  1. POAndroid TextView NullPointerException with onTouchListener and onClickListener on 4.0
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    <p>I have a TextView which I've assigned both an onTouchListener and an onClickListener:</p> <pre><code>myTextView.setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { _gestureDetector.onTouchEvent(event); return false; } }); myTextView.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Show Toast Notification } }); </code></pre> <p>The onTouchListener will detect an onFling() for the gesture detector. This code works without any problems EXCEPT for Android 4.0 (Ice cream sandwich). With 4.0, I receive a NullPointerException on "_gestureDetector.onTouchEvent(event);" (when I try to fling).</p> <p>If I comment out the onClickListener, however, the fling will work and I will not receive a NullPointerException.</p> <p>I was under the assumption that if both the touch listener returned false, the event would not be consumed, allowing both to work.</p> <p>Does anyone have any ideas? Thanks!</p> <p>Here is more of my code:</p> <pre><code> /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.calendar); _gestureDetector = new GestureDetector(new GestureListener()); } private class GestureListener extends SimpleOnGestureListener { @Override public boolean onDown(MotionEvent e) { return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (e1.getY() - e2.getY() &gt; SWIPE_MIN_DISTANCE &amp;&amp; Math.abs(velocityY) &gt; SWIPE_THRESHOLD_VELOCITY) { // Bottom to top _calendarTableLayout.removeAllViews(); int month = _calendar.get(Calendar.MONTH); _calendar.set(Calendar.MONTH, month + 1); _calendar.set(Calendar.DATE, 1); // important drawCalendar(); return true; } else if (e2.getY() - e1.getY() &gt; SWIPE_MIN_DISTANCE &amp;&amp; Math.abs(velocityY) &gt; SWIPE_THRESHOLD_VELOCITY) { // Top to bottom _calendarTableLayout.removeAllViews(); int month = _calendar.get(Calendar.MONTH); _calendar.set(Calendar.MONTH, month - 1); _calendar.set(Calendar.DATE, 1); // important redrawCalendar(); return true; } return false; } @Override public void onLongPress(MotionEvent e) { // Do nothing } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { // Do nothing return false; } @Override public void onShowPress(MotionEvent e) { // Do nothing } @Override public boolean onSingleTapUp(MotionEvent e) { // Do nothing return false; } } </code></pre> <p>Stacktrace:</p> <pre><code> 01-27 11:12:16.406: E/AndroidRuntime(1448): FATAL EXCEPTION: main 01-27 11:12:16.406: E/AndroidRuntime(1448): java.lang.NullPointerException 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.GestureDetector.onTouchEvent(GestureDetector.java:587) 01-27 11:12:16.406: E/AndroidRuntime(1448): at com.my.package.MyActivity$9.onTouch(MyActivity.java:287) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.View.dispatchTouchEvent(View.java:5481) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728) 01-27 11:12:16.406: E/AndroidRuntime(1448): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1892) 01-27 11:12:16.406: E/AndroidRuntime(1448): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1371) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.app.Activity.dispatchTouchEvent(Activity.java:2364) 01-27 11:12:16.406: E/AndroidRuntime(1448): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java: 1840) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.View.dispatchPointerEvent(View.java:5662) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2863) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.os.Handler.dispatchMessage(Handler.java:99) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.os.Looper.loop(Looper.java:137) 01-27 11:12:16.406: E/AndroidRuntime(1448): at android.app.ActivityThread.main(ActivityThread.java:4340) 01-27 11:12:16.406: E/AndroidRuntime(1448): at java.lang.reflect.Method.invokeNative(Native Method) 01-27 11:12:16.406: E/AndroidRuntime(1448): at java.lang.reflect.Method.invoke(Method.java:511) 01-27 11:12:16.406: E/AndroidRuntime(1448): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 01-27 11:12:16.406: E/AndroidRuntime(1448): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 01-27 11:12:16.406: E/AndroidRuntime(1448): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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      1. VTBountyStart
    3. VO
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      1. POAndroid TextView NullPointerException with onTouchListener and onClickListener on 4.0
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    1. COI have never used gesture detector. so I can't be very helpful, Anyway...NullPointerException because _gestureDetector is null?
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      1. USkingston
    2. CONope, _gestureDetector is not null. According to the stack trace, the NullPointerException is coming from at android.view.GestureDetector.onTouchEvent(GestureDetector.java:587)
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      1. POAndroid TextView NullPointerException with onTouchListener and onClickListener on 4.0
      1. USlittleK
    3. COAny chance you constructed the gesture detector with a null OnGestureListener?
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      1. POAndroid TextView NullPointerException with onTouchListener and onClickListener on 4.0
      1. USDavid Merriman
 

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