获取android中imageview内的触摸位置 [英] Get the touch position inside the imageview in android

问题描述

我的活动中有一个 imageview，我可以通过 onTouchListener 获取用户触摸 imageview 的位置.我在用户触摸该图像的位置放置了另一个图像.我需要存储触摸位置(x，y)，并在另一个活动中使用它来显示标签.我将触摸位置存储在第一个活动中.在第一个活动中，我的图像视图位于屏幕顶部.在第二个活动中，它位于屏幕底部.如果我使用从第一个活动存储的位置，它将标签图像放在顶部，而不是在我之前在第一个活动中单击的图像视图上.无论如何要在imageview中获得位置.

I have a imageview in my activity and I am able to get the position where the user touch the imageview, through onTouchListener. I placed another image where the user touch over that image. I need to store the touch position(x,y), and use it in another activity, to show the tags. I stored the touch position in the first activity. In the first activity, my imageview at the top of the screen. In the second activity its at the bottom of the screen. If I use the position stored from the first acitvity, it place the tag image at the top, not on the imageview, where I previously clicked in the first activity. Is there anyway to get the position inside the imageview.

第一个活动:

cp.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            x = (int) event.getX();
            y = (int) event.getY();

            Log.v("touched x val of cap img >>", x + "");
            Log.v("touched y val of cap img >>", y + "");

            tag.setVisibility(View.VISIBLE);

            int[] viewCoords = new int[2];
            cp.getLocationOnScreen(viewCoords);

            int imageX = x - viewCoords[0]; // viewCoods[0] is the X coordinate
            int imageY = y - viewCoords[1]; // viewCoods[1] is the y coordinate
            Log.v("Real x >>>",imageX+"");
            Log.v("Real y >>>",imageY+"");

            RelativeLayout rl = (RelativeLayout) findViewById(R.id.lay_lin);
            ImageView iv = new ImageView(Capture_Image.this);
            Bitmap bm = BitmapFactory.decodeResource(getResources(),
                    R.drawable.tag_icon_32);
            iv.setImageBitmap(bm);
            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                    RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
            params.leftMargin = x;
            params.topMargin = y;
            rl.addView(iv, params);

            Intent intent= new Intent(Capture_Image.this,Tag_Image.class);
            Bundle b=new Bundle();
            b.putInt("xval", imageX);
            b.putInt("yval", imageY);
            intent.putExtras(b);
            startActivity(intent);

            return false;
    }
});

在 TagImage.java 中我使用了以下内容:

In TagImage.java I used the following:

im = (ImageView) findViewById(R.id.img_cam22);
b=getIntent().getExtras();
xx=b.getInt("xval");
yy=b.getInt("yval");

im.setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
         int[] viewCoords = new int[2];
            im.getLocationOnScreen(viewCoords);

            int imageX = xx + viewCoords[0]; // viewCoods[0] is the X coordinate
            int imageY = yy+ viewCoords[1]; // viewCoods[1] is the y coordinate
            Log.v("Real x >>>",imageX+"");
            Log.v("Real y >>>",imageY+"");
        RelativeLayout rl = (RelativeLayout) findViewById(R.id.lay_lin);
        ImageView iv = new ImageView(Tag_Image.this);
        Bitmap bm = BitmapFactory.decodeResource(getResources(),
                R.drawable.tag_icon_32);
        iv.setImageBitmap(bm);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                30, 40);
        params.leftMargin =imageX ;
        params.topMargin = imageY;
        rl.addView(iv, params);
        return true;

    }
});

推荐答案

你可以得到你的视图的左上角如下:

You can get the top left corner of your view as follows:

int[] viewCoords = new int[2];
imageView.getLocationOnScreen(viewCoords);

从这个和触摸坐标你可以计算出ImageView内部的点:

From this and the touch coordinates you can calculate the point inside the ImageView:

int touchX = (int) event.getX();
int touchY = (int) event.getY();

int imageX = touchX - viewCoords[0]; // viewCoords[0] is the X coordinate
int imageY = touchY - viewCoords[1]; // viewCoords[1] is the y coordinate

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