[英]MotionEvent.ACTION_UP event is fired twice with seekbar
onStopTrackingTouch 事件被触发两次,这是一个问题,因为我只需要发出一个 getRequest。 这是我的代码:
VerticalSeekbar.java
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) {
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
super.onTouchEvent(event);
int progress = getMax() - (int) (getMax() * event.getY() / getHeight());
// Ensure progress stays within boundaries
if(progress < 0) {progress = 0;}
if(progress > getMax()) {
progress = getMax();}
setProgress(progress); // Draw progress
if(progress != lastProgress) {
// Only enact listener if the progress has actually changed
lastProgress = progress;
Information.onSeekBarChangeListener.onProgressChanged(this, progress, true);
}
onSizeChanged(getWidth(), getHeight() , 0, 0);
Log.i("radio", "action move");
setPressed(true);
setSelected(true);
case MotionEvent.ACTION_UP:
Log.i("radio", "action up"); //printed twice
Information.onSeekBarChangeListener.onStopTrackingTouch(this);
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
信息.java
onSeekBarChangeListener = new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser){
radio = (progress / (double) 10);
tv_radio.setText(radio + " Km");
}
@Override
public void onStartTrackingTouch(SeekBar seekBar){
Log.i("vertical", "onStart");
}
@Override
public void onStopTrackingTouch(SeekBar seekBar){
Log.i("vertical", "onStopTracking"); //printed twice
getRequest request = new getRequest();
request.execute("http://...");
}
};
sb_radio.setOnSeekBarChangeListener(onSeekBarChangeListener);
知道为什么MotionEvent.ACTION_UP
被检测到两次吗? 即使我只是在Seekbar
进行简单的点击而不进行拖动。
TouchListener将被要求每MotionEvent.ACTION_DOWN
, MotionEvent.ACTION_UP
和MotionEvent.ACTION_MOVE
所以问题是,在MotionEvent.ACTION_MOVE
之后缺少break
语句,因此即使您属于MotionEvent.ACTION_MOVE
情况,控件也会继续执行进一步的情况,直到达到某个停止点,例如break
等
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
super.onTouchEvent(event);
int progress = getMax() - (int) (getMax() * event.getY() / getHeight());
if(progress < 0) {progress = 0;}
if(progress > getMax()) {
progress = getMax();}
setProgress(progress);
if(progress != lastProgress) {
lastProgress = progress;
Information.onSeekBarChangeListener.onProgressChanged(this, progress, true);
}
onSizeChanged(getWidth(), getHeight() , 0, 0);
Log.i("radio", "action move");
setPressed(true);
setSelected(true);
break; // add a break statement here and problem solved
case MotionEvent.ACTION_UP:
Log.i("radio", "action up");
Information.onSeekBarChangeListener.onStopTrackingTouch(this);
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
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