安卓工作室-如何在安卓游戏中使用实现滑动手势

Question

我在安卓工作室上开发了一款游戏，用户触摸驱动瓷砖组合。为此，我使用了一个分为行和列的GridLayout。该值与imageview一起显示，所有网格布局单元格都链接到一个单独的单元格类，该类包括imageview ID。我在每个图像视图上实现了一个监听器，以检测何时发生滑动动作。初始化板和侦听器的代码如下：

for(int i = 0; i<noOfBlocks; i++) {
for (int j = 0; j < noOfBlocks; j++) {
ImageView imageView = new ImageView(this);
imageView.setId(iDcnt);
imageView.setLayoutParams(new ViewGroup.LayoutParams(widthOfBlock, widthOfBlock));
imageView.setMaxHeight(widthOfBlock);
imageView.setMaxWidth(widthOfBlock);
int randomNum = (int) Math.floor(random.nextDouble() * gamepiece.length);
imageView.setImageResource(gamepiece[randomNum]);
Cell c = new Cell(i + 1, j+1, randomNum, imageView.getId());
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
SquarePlay s = null;
try {
s = new SquarePlay();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
s.onSwipeEvent(event);
return false;
}
});
gameBoard.addView(imageView);
iDcnt++;
}

OnTouch事件在方法中的一个单独类中处理，如下所示：

float x1, x2, y1, y2, dx, dy;
public void onSwipeEvent(MotionEvent event){
switch(event.getAction()) {
case(MotionEvent.ACTION_DOWN):
x1 = event.getX();
y1 = event.getY();
break;
case(MotionEvent.ACTION_UP): {
x2 = event.getX();
y2 = event.getY();
dx = x2-x1;
dy = y2-y1;
if(Math.abs(dx) > Math.abs(dy)) {
if(dx>0)
onSwipeRight();
else
onSwipeLeft();
} else {
if(dy>0)
onSwipeDown();
else
onSwipeUp();
}
}
}

}

private void onSwipeLeft() {
System.exit(0);
}
private void onSwipeRight() {
System.exit(0);
}
private void onSwipeUp() {
System.exit(0);
}
private void onSwipeDown() {
System.exit(0);
}

注意：System.exit只是用来测试这是否有效。

应用程序加载但不会对滑动事件产生响应。有人对如何解决此问题有任何建议吗？

谢谢：(

Answer 1

要使用滑动，您可以在活动类中创建您的类，如下所示##

在活动类中声明类名

SwipeListener swipeListener;

在活动类中编写此代码以处理滑动##

private class SwipeListener implements View.OnTouchListener {
//create gesture detector variable
GestureDetector gestureDetector;
//create constructor
SwipeListener(View view){
int threshold = 100;
int velocity_threshold = 100;
GestureDetector.SimpleOnGestureListener listener =
new GestureDetector.SimpleOnGestureListener(){
@Override
public boolean onDown(MotionEvent e) {
return super.onDown(e);
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
//get x and y difference
float xDiff = e2.getX() - e1.getX();
float yDiff = e2.getY() - e1.getY();
try {
if(Math.abs(xDiff)>Math.abs(yDiff)){
if(Math.abs(xDiff)>threshold &&
Math.abs(velocityX)> velocity_threshold){
if(xDiff > 0){
//swipe right
Intent intent = new Intent(TopUpBalance.this, HomePage.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
}else{
//swipe left
}
return true;
}//you can handle swipe down and above here as well, the same way above
}
}catch (Exception e){
e.printStackTrace();
}
return false;
}
};
//init gesture
gestureDetector = new GestureDetector(listener);
view.setOnTouchListener(this);

}
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
return gestureDetector.onTouchEvent(motionEvent);
}
}

如下声明SwipeListener onCreate方法##

linearLayout = findViewById(R.id.layoutID);
//swipe
swipeListener = new SwipeListener(linearLayout);