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Postsdbo
PO
 

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    <p>I tried your code and indeed it didn't work, then I changed the GestureDetector to the newer/updated API "GestureDetectorCompat" and changed a few further things: Used the GestureDetector.OnGestureListener instead of the OnSimpleGestureListener, onDown() should return true and then it worked. I can't explain it to you, what was the exact problem. But the change lines seemed to be problematic. Maybe someone can explain the underlying problem. Have a look at the code, which is working: </p> <pre><code>public class MainActivity extends Activity { ImageView imageView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imageView= (ImageView) findViewById(R.id.imageView1); final GestureDetectorCompat gdt = new GestureDetectorCompat(this, new SwipeGestureListener(this)); imageView.setOnTouchListener(new OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { return gdt.onTouchEvent(event); } }); } public class SwipeGestureListener implements GestureDetector.OnGestureListener{ private static final int SWIPE_MIN_DISTANCE = 150; private static final int SWIPE_MAX_OFF_PATH = 100; private static final int SWIPE_THRESHOLD_VELOCITY = 100; private final Activity activity; protected MotionEvent mLastOnDownEvent = null; public SwipeGestureListener(Activity activity) { this.activity = activity; } @Override public boolean onDown(MotionEvent e) { mLastOnDownEvent = e; System.err.println("ondown"); //System.out.println(e); return true; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { System.err.println("onFling"); System.out.println(e1 + " " + e2); if (e1==null) e1 = mLastOnDownEvent; if (e1==null || e2==null) return false; float dX = e2.getX()-e1.getX(); float dY = e2.getY()-e1.getY(); if (Math.abs(dY)&lt;SWIPE_MAX_OFF_PATH &amp;&amp; Math.abs(velocityX)&gt;=SWIPE_THRESHOLD_VELOCITY &amp;&amp; Math.abs(dX)&gt;=SWIPE_MIN_DISTANCE ) { if (dX&gt;0) { Toast.makeText(activity.getApplicationContext(), "Right Swipe", Toast.LENGTH_SHORT).show(); // activity.fetchPrevious(); } else { Toast.makeText(activity.getApplicationContext(), "Left Swipe", Toast.LENGTH_SHORT).show(); // activity.fetchNext(); } return true; } return false; } @Override public void onLongPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub return false; } } } </code></pre> <p>Please try it!</p>
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    1. POOnFling MotionEvent e1 null?
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    1. COSorry G_J, it's still the same. e1 still gives me null value
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    2. COThat's really strange. Did you try it with a different View (not ListView)? The code above works absolutely flawlessly, when I register an ImageView to the OnTouchListener! Could you show the rest of your code?
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    3. COYes I agree.. It works with the other view but not on one of my listview.. I will try to investigate the xml then.. Thanks for your help G_J
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