将Fling Gesture添加到图像视图 - Android

Question

好的,我在这里引用了代码:在网格布局上进行手势检测

但是无法让它发挥作用.在我的主要活动中,我定义了一个简单的图像.我想检测一下图像上的闪光.这是我的代码如下.底部的onclick方法为空.是因为这个吗？我把它留空了,因为在其他代码示例中它不是我想要的.我只想要一个简单的吐司,弹出正确的方向或向前扔.

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) {}
}

Answer 1

这是我能想到的最简单的弗林格工作版本.实际上,您可以将其绑定到任何组件,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;
        }
    }
}

虽然没有活动onClickListener(如果你不需要捕获任何onclick动作)它不仅捕获水平,而且还捕获垂直(如果你不需要它,只删除垂直部分),水平滑动具有优先级,你可以看到.在方法返回的地方(我的评论在哪里)只是调用你的方法或其他:)

Answer 2

试试这个

imageView.setOnTouchListener(new View.OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)) {
                return false;
            }
            return true;
        }
  });

Answer 3

imageView.setOnTouchListener(new View.OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return !gestureDetector.onTouchEvent(event);
    }
});

Answer 4

一些前提条件

1）setonClick方法

image.setOnClickListener(this);

2）在onTouch()中设置手势检测

image.setOnTouchListener(new OnTouchListener() {
    GestureDetector gestureDetector = new GestureDetector(new SwingGestureDetection((mContext),image,a));
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
});

3）创建SwingGestureDetection类并实现所有方法

@Override
public boolean onFling(MotionEvent start, MotionEvent finish, float arg2,float arg3) {
    if (start.getRawX() < finish.getRawX()) {
        System.out.println("next...swing");
    } else {
        System.out.println("previois...swing");
    }
}

4）在构造函数中传递你的图像视图

public SwingGestureDetection(Context con,ImageView image,int pos) {
    mContext = con;
    this.image = image;
    this.position = pos;
}

这对我来说是完美的工作。如果有任何疑问，请发表评论。