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POsome problems about Multitouch
 

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  1. POsome problems about Multitouch
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    <p>I want to judge the distance between two points when I touch the screen and move my two fingers.I don't konw my calculation method is right or wrong.If you have the true method,please tell me.Thanks very much.</p> <pre><code>public class MyMultitouch implements OnTouchListener, OnGestureListener{ private GestureDetector mGestureDetector; private View view; private LinearLayout _first_linearlayout; private LinearLayout _middle_linearlayout; private float beforeLenght1,beforeLenght2; private float afterLenght1,afterLenght2; private float gapLenght,gapLenght1,gapLenght2; public MyMultitouch(View view){ this.mGestureDetector = new GestureDetector(this); this.view = view; mGestureDetector.setIsLongpressEnabled(true); } @Override public boolean onDown(MotionEvent e) { // TODO Auto-generated method stub return false; } public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { float moveX1 = e1.getX(1) - e1.getX(0); float moveY1 = e1.getY(1) - e1.getY(0); float moveX2 = e2.getX(1) - e2.getX(0); float moveY2 = e2.getY(1) - e2.getY(0); switch (e1.getAction()) { case MotionEvent.ACTION_DOWN: beforeLenght1 = (float) Math.sqrt((moveX1 * moveX1) + (moveY1 * moveY1)); beforeLenght2 = (float) Math.sqrt((moveX2 * moveX2) + (moveY2 * moveY2)); break; case MotionEvent.ACTION_MOVE: afterLenght1 = (float) Math.sqrt((moveX1 * moveX1) + (moveY1 * moveY1)); afterLenght2 = (float) Math.sqrt((moveX2 * moveX2) + (moveY2 * moveY2)); gapLenght1 = afterLenght1 - beforeLenght1; gapLenght2 = afterLenght2 - beforeLenght2; gapLenght = gapLenght2 - gapLenght1; } if (gapLenght &gt; 0) { _first_linearlayout = (LinearLayout)view.findViewById(R.id.first_linearlayout); _middle_linearlayout = (LinearLayout)view.findViewById(R.id.middle_linearlayout); _first_linearlayout.setVisibility(View.GONE); _middle_linearlayout.setVisibility(View.GONE); } if (gapLenght &lt; 0) { _first_linearlayout = (LinearLayout)view.findViewById(R.id.first_linearlayout); _middle_linearlayout = (LinearLayout)view.findViewById(R.id.middle_linearlayout); _first_linearlayout.setVisibility(View.VISIBLE); _middle_linearlayout.setVisibility(View.VISIBLE); } return true; } @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; } @Override public boolean onTouch(View arg0, MotionEvent arg1) { // TODO Auto-generated method stub return mGestureDetector.onTouchEvent(arg1); } } </code></pre> <p>`</p>
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    1. USRobert
    1. USXX_brother
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      1. POsome problems about Multitouch
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      1. VTUpMod
    1. COonFling should be used to track 1 finger moving across the screen (to 'fling' or scroll something). The 2 MotionEvent arguments are the start and end points of the fling. Do your calculations in onTouch and get the pointerId from the MotionEvent (which tells you which finger the motion event belongs too). Note that unless you have a *distinct* multi touch screen, the pointer ids may get mixed up.
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      1. POsome problems about Multitouch
      1. USFunkTheMonk
    2. COOK,I konw.Thanks.
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      1. POsome problems about Multitouch
      1. USXX_brother
 

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