java - Android - 如何在滑动时移动 ImageView

Question

我刚开始为 Android 应用程序实现滑动手势。我正在尝试使用以下代码从屏幕的左侧向右侧滑动 ImageView:

 public class MainActivity extends Activity implements OnClickListener{
private static final int SWIPE_MIN_DISTANCE = 10;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ImageView btnSwipe = (ImageView)findViewById(R.id.imgBtnSwipe);
    btnSwipe.setOnClickListener(this);
    gestureDetector = new GestureDetector(this, new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            return gestureDetector.onTouchEvent(event);
        }
    };
    btnSwipe.setOnTouchListener(gestureListener);
}
class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(MainActivity.this, "Left Swipe", Toast.LENGTH_SHORT).show();
            }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Toast.makeText(MainActivity.this, "Right Swipe", Toast.LENGTH_SHORT).show();
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }

}
@Override
public void onClick(View v) {
}
}

我收到 Toast 消息作为 Right Swipe。但是图像没有移动。我该如何实现？请帮我提供示例代码/链接。

Answer 1

我找到了一个简单的解决方案如下:

向右滑动(向右):

btnSwipe.setTranslationX(e2.getX());

向左滑动(向左)"

btnSwipe.setTranslation(e1.getX());

现在，ImageView 正在从右到左和从左到右水平过渡。但这从 Android API Level 11 开始有效。