2 finger swipe in android

问题:

I tried implementing 2 finger swipe using onFling method of SimpleOnGestureListener. However,I found that SimpleOnGestureListener doesn't support two finger touch.

How can I work it out ?

回答1:

My Solution works, but its quite ugly to use a public static int to count how many fingers there are. i had to set fingercount back to one after i flinged with two fingers because i couldnot get the action_pointer_down for one finger anymore... i dont know why... but this solution would also work for more fingers... hope someone can use it in the feature

public class RemoteFragment extends Fragment{  public static int fingercount = 1;      @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,         Bundle savedInstanceState) {      final GestureDetector gdt = new GestureDetector(getActivity(),             new RemoteGestureListener());      View view = inflater.inflate(R.layout.gestures, container, false);      view.setOnTouchListener(new OnTouchListener() {          @Override         public boolean onTouch(final View view, final MotionEvent event) {             int action = event.getAction();              switch (action & MotionEvent.ACTION_MASK) {             case MotionEvent.ACTION_POINTER_DOWN:                 Log.d(TAG,                         "Pointer-Count ="                                 + String.valueOf(fingerCount = event                                         .getPointerCount()));                  break;             }             gdt.onTouchEvent(event);             return true;         }     });     return view; } }  public class RemoteGestureListener implements OnGestureListenerr {  private final static String TAG = "RemoteGestureListener";  private static final int SWIPE_MIN_DISTANCE = 120; private static final int SWIPE_THRESHOLD_VELOCITY = 200;   public RemoteGestureListener() { }  @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,         float velocityY) {      Log.d(TAG, "onFling");     if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE             && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {         if (RemoteFragment.fingerCount == 1) {             Log.d(TAG, "Left Swipe");         } else {             Log.d(TAG, "Left xFinger Swipe");             RemoteFragment.fingerCount = 1;         }         return true; // Right to left     } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE             && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {         if (RemoteFragment.fingerCount == 1) {             Log.d(TAG, "Right Swipe");         } else {             Log.d(TAG, "Right xFinger Swipe");             RemoteFragment.fingerCount = 1;         }         return true; // Left to right     }      if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE             && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {         if (RemoteFragment.fingerCount == 1) {             Log.d(TAG, "Top Swipe");         } else {             Log.d(TAG, "Top xFinger Swipe");             RemoteFragment.fingerCount = 1;         }         return true; // Bottom to top     } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE             && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {         if (RemoteFragment.fingerCount == 1) {             Log.d(TAG, "Bottom Swipe");         } else {             Log.d(TAG, "Bottom xFinger Swipe");             RemoteFragment.fingerCount = 1;         }         return true;     }     return true; } 

回答2:

You could try to use OnTouchListener with MotionEvent.ACTION_POINTER_DOWN like this:

 button.setOnTouchListener(new View.OnTouchListener() {         public boolean onTouch(View view, MotionEvent motionEvent) {             int action = motionEvent.getAction();              switch(action & MotionEvent.ACTION_MASK)             {                 case MotionEvent.ACTION_POINTER_DOWN:                     Toast.makeText(MyActivity.this, " Two Fingers Tapped Once. Yeeeyy :)", 0).show();                      // set the mTwoFingersTapped flag to TRUE when we tap with 2 fingers at once                     mTwoFingersTapped = true;                     break;             }             return false;         }     }); 

Here is a tutorial which explains how to do it if you need more details. I hope it will help.

回答3:

I had made a library some time ago that makes implementing 1/multi finger swipes very easy.

You can find more detailed documentation of the API here A sample implementation can be found here

The part that you want to look at is

ImageView mv = (ImageView) findViewById(R.id.myview); final TextView grtv = (TextView) findViewById(R.id.gestureResultTextView); SimpleFingerGestures.DEBUG = true; SimpleFingerGestures.CONSUME_TOUCH_EVENTS = true; SimpleFingerGestures sfg = new SimpleFingerGestures(); sfg.setOnFingerGestureListener(new SimpleFingerGestures.OnFingerGestureListener() { @Override public boolean onSwipeUp(int fingers, long gestureDuration) { grtv.setText("swiped " + fingers + " up"); return false; } @Override public boolean onSwipeDown(int fingers, long gestureDuration) { grtv.setText("swiped " + fingers + " down"); return false; } @Override public boolean onSwipeLeft(int fingers, long gestureDuration) { grtv.setText("swiped " + fingers + " left"); return false; } @Override public boolean onSwipeRight(int fingers, long gestureDuration) { grtv.setText("swiped " + fingers + " right"); return false; } @Override public boolean onPinch(int fingers, long gestureDuration) { grtv.setText("pinch"); return false; } @Override public boolean onUnpinch(int fingers, long gestureDuration) { grtv.setText("unpinch"); return false; } }); mv.setOnTouchListener(sfg); 

文章来源: 2 finger swipe in android