好吧,我一直在这里引用代码:Fling gesture detection on grid layout

但只是无法使其正常工作。在我的主要 Activity 中,我定义了一个简单的图像。我想检测图像上的窜动。这是我的下面的代码。底部的onclick方法为空。是因为这个吗?我将其留空,因为在其他代码示例中,它不是我想要的。我只想弹出一个简单的吐司,说向右挥动或向左挥动。

public class GestureRightLeft extends Activity implements OnClickListener  {

    ImageView peek;

    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 250;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
    private GestureDetector gestureDetector;
    View.OnTouchListener gestureListener;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        peek =(ImageView) findViewById(R.id.peek);
        peek.setImageResource(R.drawable.bluestrip);

        gestureDetector = new GestureDetector(new MyGestureDetector());
        gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                if (gestureDetector.onTouchEvent(event)) {
                    return true;
                }
                return false;
            }
        };
    }

    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;
                // right to left swipe
                if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    Toast.makeText(GestureRightLeft.this, "Left Swipe", Toast.LENGTH_SHORT).show();
                }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    Toast.makeText(GestureRightLeft.this, "Right Swipe", Toast.LENGTH_SHORT).show();
                }
            } catch (Exception e) {
                // nothing
            }
            return false;
        }
    }

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

最佳答案

这是我能想到的最简单的flinger工作版本。
实际上,您可以将其绑定(bind)到任何组件,而不仅仅是ImageView。

public class MyActivity extends Activity {
    private void onCreate() {
        final GestureDetector gdt = new GestureDetector(new GestureListener());
        final ImageView imageView  = (ImageView) findViewById(R.id.image_view);
        imageView.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(final View view, final MotionEvent event) {
                gdt.onTouchEvent(event);
                return true;
            }
        });
    }

    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;

    private class GestureListener extends SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                return false; // Right to left
            }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                return false; // Left to right
            }

            if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
                return false; // Bottom to top
            }  else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
                return false; // Top to bottom
            }
            return false;
        }
    }
}

但是没有 Activity onClickListener(如果您不需要捕获任何onclick Action )
它不仅捕获水平,还捕获垂直(如果不需要,只需删除垂直部分),并且可以看到水平滑动优先。
在方法返回的地方(我的评论所在的地方),只需调用您的方法或其他任何方法即可:)

关于android - 将Fling Gesture添加到 ImageView -Android,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/4098198/

10-10 10:07