Question

如何在图像上滑动手指时找到触摸事件。

相对布局包含多个图像视图。它们是随机放置的。当我在屏幕上滑动手指时，我想捕获用户越过手指的图像视图。

我能够捕获相对布局触摸事件请提示一些捕获图像视图的方法在相对布局中触摸了滑动动作。

附加图片布局以便更好地理解。

enter image description here

CODE：

public class MainActivity extends Activity {

    ImageView imageView;
    Rect imageViewArea;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView=(ImageView) findViewById(R.id.imageView);
        imageViewArea = new Rect();
        //imageView.getGlobalVisibleRect(imageViewArea);


        //not working
        imageView.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                return false;
            }
        });
    }

    //working
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        switch(event.getActionMasked())
        {
        case MotionEvent.ACTION_DOWN:
            break;
        case MotionEvent.ACTION_MOVE:
            Log.i("log", "ACTION_MOVE");

            int x = (int) event.getX();
            int y = (int) event.getY();

            //not working 
            if(imageViewArea.contains(x, y)) {
                Toast.makeText(getApplicationContext(), "clicked", Toast.LENGTH_LONG).show();
            }

            break;
        case MotionEvent.ACTION_UP:
            break;
        default:
            break;
        }
        return super.onTouchEvent(event);
    }

Answer 1

此示例代码可以帮助您......

    final RelativeLayout layout  =(RelativeLayout) findViewById(R.id.detailsView);
    final ImageView imageView = (ImageView) findViewById(R.id.imageView);
    final Rect imageViewArea = new Rect();
    imageView.getGlobalVisibleRect(imageViewArea);
    layout.setOnTouchListener(new View.OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int x = (int) event.getX();
            int y = (int) event.getY();
            if(imageViewArea.contains(x, y)) {
                // swipe is passing over ImageView....
            }
            return true;
        }
    });

编辑：

private ImageView imageView;
private Rect imageRect;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView = (ImageView) findViewById(R.id.imageView1);
}


@Override
public boolean onTouchEvent(MotionEvent event) {
    super.onTouchEvent(event);
    if (imageRect == null) {
        imageRect = new Rect();
        imageView.getGlobalVisibleRect(imageRect);
    }
    int x = (int) event.getX();
    int y = (int) event.getY();
    if (imageRect.contains(x, y)) {
        Log.i(TAG, "touch passing over imageView");
    }
    return true;
}

Answer 2

使用覆盖onTouch方法

将OnTouchListener设置为镜像或创建自己的ImageView类

如何在ImageView上滑动手指时找到触摸事件

2 个答案: