我在我的应用程序中实现了按钮拖动,但问题是为什么我拖动按钮时会超出屏幕边缘,导致看不到按钮。请修复它。我需要将按钮拖动到屏幕边缘。我已经尝试了下面的代码,如果有错误请纠正:
@Override
public boolean onTouch(View v, MotionEvent event)
{
final int d_X = (int) event.getRawX();
final int d_Y = (int) event.getRawY();
PointF start = new PointF();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
start.set(event.getX(),event.getY());
if(shouldAllowToDrag) // if it true then i will allow to drag.
{
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) v.getLayoutParams();
_xDelta = d_X - lParams.leftMargin;
_yDelta = d_Y - lParams.topMargin;
}
else
{
//check for double click
long pressTime = System.currentTimeMillis();
// If double click...
String buttonTitle = moveButton.getText().toString();
if (pressTime - lastPressTime <= DOUBLE_PRESS_INTERVAL) {
Log.i(TAG,"doubleTappedistrue");
hasLatchedDown = false;
if(buttonTitle.equals("Unlocked"))
{
hasButtonUnlocked = false;
moveButton.setText("Locked");
}
else if(buttonTitle.equals("Locked"))
{
hasButtonUnlocked = true;
moveButton.setText("Unlocked");
}
}
else
{
hasLatchedDown = true;
buttonLastStateText = buttonTitle;
moveButton.setText("Unlocked");
}
lastPressTime = pressTime;
}
break;
case MotionEvent.ACTION_UP:
if(!shouldAllowToDrag)
{
if(hasLatchedDown)
{
hasLatchedDown = false;
moveButton.setText(buttonLastStateText);
}
}
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
if(shouldAllowToDrag){
View parentView = (View) v.getParent();
parentView.getWidth();
parentView.getHeight();
imageView.getWidth();
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) v.getLayoutParams();
layoutParams.leftMargin = d_X - _xDelta;
layoutParams.topMargin = d_Y - _yDelta;
v.setLayoutParams(layoutParams);
}
break;
}
return true;
}
topMargin
已经起作用了,你能帮我把右边和底部也调整一下吗? - Arbaz.in