[英]Handling onTouch and onClick events properly in android
我正在使用以下代碼在屏幕上拖動視圖
tweatBtn.setOnTouchListener(new View.OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
float currX,currY;
int action = event.getAction();
switch (action ) {
case MotionEvent.ACTION_DOWN:
{
mPrevX = event.getRawX();
mPrevY = event.getRawY();
btnPrevX = tweatBtn.getX();
btnPrevY = tweatBtn.getY();
break;
}
case MotionEvent.ACTION_MOVE:
{
Display display = getActivity().getWindowManager().getDefaultDisplay();
int width = display.getWidth() + 80; // deprecated
int height = display.getHeight(); // deprecated
currX = event.getRawX();
currY = event.getRawY();
if(tweatBtn.getY() > 80 && tweatBtn.getX() > 0 && tweatBtn.getX() < width)
{
tweatBtn.setX(btnPrevX + currX - mPrevX);
tweatBtn.setY(btnPrevY + currY - mPrevY);
}
else
{
if((btnPrevY + currY - mPrevY) > 70 && (btnPrevX + currX - mPrevX) > -10 && tweatBtn.getX() < (width - 10))
{
tweatBtn.setX(btnPrevX + currX - mPrevX);
tweatBtn.setY(btnPrevY + currY - mPrevY);
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_UP:
break;
}
return false;
}
});
}
它可以正常工作,但有時在我舉起手指時會自動觸發喀噠聲。如何改善?
在代碼末尾,您總是返回false
。 這意味着您設置的touchListener無法處理觸摸。 由於是否存在,View會將任何正常的觸摸都視為點擊。 您應該做的是在拖動視圖時return True
,否則應該return False
boolean dragged = false;
ViewConfiguration viewConfiguration = ViewConfiguration.get(getContext());
int minTouchSlop = viewConfiguration.getScaledTouchSlop();
.....
public boolean onTouch(View v, MotionEvent event)
{
float currX,currY;
int action = event.getAction();
switch (action ) {
case MotionEvent.ACTION_DOWN:
{
mPrevX = event.getRawX();
mPrevY = event.getRawY();
btnPrevX = tweatBtn.getX();
btnPrevY = tweatBtn.getY();
dragged = false; // global dragged variable
break;
}
case MotionEvent.ACTION_MOVE:
{
Display display = getActivity().getWindowManager().getDefaultDisplay();
int width = display.getWidth() + 80; // deprecated
int height = display.getHeight(); // deprecated
currX = event.getRawX();
currY = event.getRawY();
if(Math.abs(currX-mPrevX) > minTouchSlop || Math.abs(currY-mPrevY) > minTouchSlop)
dragged = true; // differntiate btw drag or click
if(tweatBtn.getY() > 80 && tweatBtn.getX() > 0 && tweatBtn.getX() < width)
{
tweatBtn.setX(btnPrevX + currX - mPrevX);
tweatBtn.setY(btnPrevY + currY - mPrevY);
}
else
{
if((btnPrevY + currY - mPrevY) > 70 && (btnPrevX + currX - mPrevX) > -10 && tweatBtn.getX() < (width - 10))
{
tweatBtn.setX(btnPrevX + currX - mPrevX);
tweatBtn.setY(btnPrevY + currY - mPrevY);
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_UP:
break;
}
return dragged;
}
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