我需要在自定义视图的onuch方法中进行单边触摸检测.我尝试在ACTION-DOWN和ACTION-UP中获取x和y值,而在ACTION-UP中我给出的条件是,如果ACTIONDOWN和ACTION-UP中的X和Y的值相等,则将其作为单次点击.
我的代码如下
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (!mSupportsZoom && !mSupportsPan) return false;
mScaleDetector.onTouchEvent(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
mLastTouchX = x; //here i get x and y values in action down
mLastTouchY = y;
mActivePointerId = ev.getPointerId(0);
break;
}
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
if (mSupportsPan && !mScaleDetector.isInProgress()) {
final float dx = x - mLastTouchX;
final float dy = y - mLastTouchY;
mPosX += dx;
mPosY += dy;
//mFocusX = mPosX;
//mFocusY = mPosY;
invalidate();
}
mLastTouchX = x;
mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
final float x = ev.getX();
final float y = ev.getY();
touchupX=x; //here is get x and y values at action up
touchupY=y;
if(mLastTouchX == touchupX && mLastTouchY == touchupY){ //my condition if both the x and y values are same .
PinchZoomPanActivity2.tapped1(this.getContext(),100); //my method if the singletap is detected
}
else{
}
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK)
>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastTouchX = ev.getX(newPointerIndex);
mLastTouchY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
}
break;
}
}
return true;
}
但我不能完成.我的意思是在每一个动作,我的方法被称为.即使动作和动作的x和y值都不相同.我想我也需要把一些范围放在单边,我们用手指触摸屏幕.有人可以给我一些建议吗
解决方法
最近我也遇到了同样的问题,最终不得不实施去抖动来使其工作.这不是理想的,但它是非常可靠的,直到我能找到更好的东西.
View.onClickListener对我来说更可靠,但不幸的是,我需要OnTouchListener的MotionEvent.
class CustomView extends View {
private static long mDeBounce = 0;
static OnTouchListener listenerMotionEvent = new OnTouchListener() {
@Override
public boolean onTouch(View view,MotionEvent motionEvent) {
if ( Math.abs(mDeBounce - motionEvent.getEventTime()) < 250) {
//Ignore if it's been less then 250ms since
//the item was last clicked
return true;
}
int intCurrentY = Math.round(motionEvent.getY());
int intCurrentX = Math.round(motionEvent.getX());
int intStartY = motionEvent.getHistorySize() > 0 ? Math.round(motionEvent.getHistoricalY(0)) : intCurrentY;
int intStartX = motionEvent.getHistorySize() > 0 ? Math.round(motionEvent.getHistoricalX(0)) : intCurrentX;
if ( (motionEvent.getAction() == MotionEvent.ACTION_UP) && (Math.abs(intCurrentX - intStartX) < 3) && (Math.abs(intCurrentY - intStartY) < 3) ) {
if ( mDeBounce > motionEvent.getDownTime() ) {
//Still got occasional duplicates without this
return true;
}
//Handle the click
mDeBounce = motionEvent.getEventTime();
return true;
}
return false;
}
};
}
