我正在为基于 android 中的surfaceview 的游戏设计虚拟按钮。我已经重写了 onTouch(MotionEvent event) 方法来执行多点触控功能，但它的行为并不符合我的预期。当一根手指被触摸时，第二根手指不会被识别，因此我无法按需要执行这些功能。这是我覆盖的方法的代码。
@Override
public boolean onTouchEvent(MotionEvent event){
touchX = (int)event.getX();
touchY = (int)event.getY();
int action = event.getActionMasked();//event.getAction() & MotionEvent.ACTION_MASK;
if(touchX >= 0 && touchX <= leftbutton.getWidth() && touchY >= this.getHeight() - 100 && touchY <= this.getHeight()){
if (action == MotionEvent.ACTION_DOWN){
starship.setLeftRight(1, 0, true);
leftButton.update(touchedleftbutton);
}
else if (action == MotionEvent.ACTION_UP){
starship.setLeftRight(0, 0, false);
leftButton.update(leftbutton);
}
else if (action == MotionEvent.ACTION_POINTER_DOWN){
starship.setLeftRight(1, 0, true);
leftButton.update(touchedleftbutton);
}
else if (action == MotionEvent.ACTION_POINTER_UP){
starship.setLeftRight(0, 0, false);
leftButton.update(leftbutton);
}
}
else if (touchX >= 20 + leftbutton.getWidth() && touchX <= 20 + leftbutton.getWidth() + rightbutton.getWidth() && touchY >= this.getHeight() - 100 && touchY <= this.getHeight()){
if (action == MotionEvent.ACTION_DOWN){
starship.setLeftRight(0, 1, true);
rightButton.update(touchedrightbutton);
}
else if (action == MotionEvent.ACTION_UP){
starship.setLeftRight(0, 0, false);
rightButton.update(rightbutton);
}
else if (action == MotionEvent.ACTION_POINTER_DOWN){
starship.setLeftRight(0, 1, true);
rightButton.update(touchedrightbutton);
}
else if (action == MotionEvent.ACTION_POINTER_UP){
starship.setLeftRight(0, 0, false);
rightButton.update(rightbutton);
}
}
else if(touchX >= this.getWidth() - shootbutton.getWidth() && touchY >+ this.getHeight() - 100 && touchY < this.getHeight()){
if (action == MotionEvent.ACTION_DOWN){
shootButton.update(shoottouched);
}
else if (action == MotionEvent.ACTION_UP){
shootButton.update(shootbutton);
}
else if (action == MotionEvent.ACTION_POINTER_DOWN){
shootButton.update(shoottouched);
}
else if (action == MotionEvent.ACTION_POINTER_UP){
shootButton.update(shootbutton);
}
}
return true;
}
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我能够解决我的问题，现在一切正常。这是我更新的代码。希望它可以帮助任何与我有同样问题的人。
@Override
public boolean onTouchEvent(MotionEvent event){
int action = event.getActionMasked();//event.getAction() & MotionEvent.ACTION_MASK;
int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_ID_MASK) >> MotionEvent.ACTION_POINTER_ID_SHIFT;
int pointerID = event.getPointerId(pointerIndex);
int pointerCount = event.getPointerCount();
touchX = new int[pointerCount];
touchY = new int[pointerCount];
for(int i = 0; i<pointerCount; i++){
touchX[i] = (int) event.getX(i);
touchY[i] = (int) event.getY(i);
}
switch(action){
case MotionEvent.ACTION_DOWN:
if(touchX[0] >= 0 && touchX[0] <= leftbutton.getWidth() && touchY[0] >= this.getHeight() - 100 && touchY[0] <= this.getHeight()){
starship.setLeftRight(1, 0, true);
leftButton.update(touchedleftbutton);
}
else if (touchX[0] >= 20 + leftbutton.getWidth() && touchX[0] <= 20 + leftbutton.getWidth() + rightbutton.getWidth() && touchY[0] >= this.getHeight() - 100 && touchY[0] <= this.getHeight()){
starship.setLeftRight(0, 1, true);
rightButton.update(touchedrightbutton);
}
else if(touchX[0] >= this.getWidth() - shootbutton.getWidth() && touchY[0] >+ this.getHeight() - 100 && touchY[0] < this.getHeight()){
shootButton.update(shoottouched);
}
break;
case MotionEvent.ACTION_UP:
if(touchX[0] >= 0 && touchX[0] <= leftbutton.getWidth() && touchY[0] >= this.getHeight() - 100 && touchY[0] <= this.getHeight()){
starship.setLeftRight(0, 0, false);
leftButton.update(leftbutton);
}
else if (touchX[0] >= 20 + leftbutton.getWidth() && touchX[0] <= 20 + leftbutton.getWidth() + rightbutton.getWidth() && touchY[0] >= this.getHeight() - 100 && touchY[0] <= this.getHeight()){
starship.setLeftRight(0, 0, false);
rightButton.update(rightbutton);
}
else if(touchX[0] >= this.getWidth() - shootbutton.getWidth() && touchY[0] >+ this.getHeight() - 100 && touchY[0] < this.getHeight()){
shootButton.update(shootbutton);
}
break;
case MotionEvent.ACTION_POINTER_DOWN:
if(touchX[pointerID] >= 0 && touchX[pointerID] <= leftbutton.getWidth() && touchY[pointerID] >= this.getHeight() - 100 && touchY[pointerID] <= this.getHeight()){
starship.setLeftRight(1, 0, true);
leftButton.update(touchedleftbutton);
}
else if (touchX[pointerID] >= 20 + leftbutton.getWidth() && touchX[pointerID] <= 20 + leftbutton.getWidth() + rightbutton.getWidth() && touchY[pointerID] >= this.getHeight() - 100 && touchY[pointerID] <= this.getHeight()){
starship.setLeftRight(0, 1, true);
rightButton.update(touchedrightbutton);
}
else if(touchX[pointerID] >= this.getWidth() - shootbutton.getWidth() && touchY[pointerID] >+ this.getHeight() - 100 && touchY[pointerID] < this.getHeight()){
shootButton.update(shoottouched);
}
break;
case MotionEvent.ACTION_POINTER_UP:
if(touchX[pointerID] >= 0 && touchX[pointerID] <= leftbutton.getWidth() && touchY[pointerID] >= this.getHeight() - 100 && touchY[pointerID] <= this.getHeight()){
starship.setLeftRight(0, 0, false);
leftButton.update(leftbutton);
}
else if (touchX[pointerID] >= 20 + leftbutton.getWidth() && touchX[pointerID] <= 20 + leftbutton.getWidth() + rightbutton.getWidth() && touchY[pointerID] >= this.getHeight() - 100 && touchY[pointerID] <= this.getHeight()){
starship.setLeftRight(0, 0, false);
rightButton.update(rightbutton);
}
else if(touchX[pointerID] >= this.getWidth() - shootbutton.getWidth() && touchY[pointerID] >+ this.getHeight() - 100 && touchY[pointerID] < this.getHeight()){
shootButton.update(shootbutton);
}
break;
}
return true;
}