Question

我已经实现了缩放和拖动功能，工作正常，同时我面临的问题是，一旦拖动结束，图像就会回到右下角。下面是我用于拖动的代码。你能指导我如何控制/记住我最后拖动的位置。

frameLayout = (FrameLayout) findViewById(R.id.relativeLayout);
    frameLayout.setDrawingCacheEnabled(true);
    frameLayout.buildDrawingCache();
    bm = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bm);
    frameLayout.draw(c);
    frameLayout.setOnTouchListener(this);`

    @Override
    public boolean onTouch(View v, MotionEvent event) {
    int x = (int) event.getX();
    int y = (int) event.getY();
    if (x < 0) {

        img_must_cities.setX(0);
        img_must_cities.setY(y);
        img_road_names.setX(0);
        img_road_names.setY(y);

        x = 0;

        Toast.makeText(getApplicationContext(), "x=0", Toast.LENGTH_SHORT).show();
    }
    if (y < 0) {

        img_must_cities.setY(0);
        img_must_cities.setX(x);
        img_road_names.setY(0);
        img_road_names.setX(x);

        y = 0;
        Toast.makeText(getApplicationContext(), "y=0", Toast.LENGTH_SHORT).show();
    }
    if (x > bm.getWidth()) {
        x = bm.getWidth() - 20;
        img_must_cities.setX(x);
        img_must_cities.setY(y);
        img_road_names.setX(x);
        img_road_names.setY(y);
        Toast.makeText(getApplicationContext(), "x=bitmap.maxwidth(}", Toast.LENGTH_SHORT).show();
    }
    if (y > bm.getHeight()) {
        y = bm.getHeight() - 20;
        img_must_cities.setX(x);
        img_must_cities.setY(y);
        img_road_names.setX(x);
        img_road_names.setY(y);
        Toast.makeText(getApplicationContext(), "y=bitmap.maxheight(}", Toast.LENGTH_SHORT).show();
    }
    if (x > 0 && x < bm.getWidth() && y > 0 && y < bm.getHeight()) {
        int action = event.getAction();
        int pixel = bm.getPixel((int) x, (int) y);

        switch (action & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN: {
                Log.e("COORDINATES", "Touch coordinates : x" + String.valueOf(x) + "y" + String.valueOf(y));

                img_must_cities.setX(x);
                img_must_cities.setY(y);
                img_road_names.setX(x);
                img_road_names.setY(y);
                inRed = Color.red(pixel);
                inBlue = Color.blue(pixel);
                inGreen = Color.green(pixel);
                Log.e("Colors", "R:" + inRed + " G:" + inGreen + " B:" + inBlue);
                break;
            }
            case MotionEvent.ACTION_MOVE: {
                Log.e("COORDINATES", "Touch coordinates : x" + String.valueOf(x) + "y" + String.valueOf(y));
                img_must_cities.setX(x);
                img_must_cities.setY(y);
                img_road_names.setX(x);
                img_road_names.setY(y);
                inRed = Color.red(pixel);
                inBlue = Color.blue(pixel);
                inGreen = Color.green(pixel);
                Log.e("Colors", "R:" + inRed + " G:" + inGreen + " B:" + inBlue);
                break;
            }
        }
    }
    if (x < 0 && x < bm.getWidth() && y < 0 && y < bm.getHeight()) {
        int action = event.getAction();
        int pixel = bm.getPixel((int) x, (int) y);

        switch (action & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN: {
                Log.e("COORDINATES", "Touch coordinates : x" + String.valueOf(x) + "y" + String.valueOf(y));

                img_must_cities.setX(x);
                img_must_cities.setY(y);
                img_road_names.setX(x);
                img_road_names.setY(y);
                inRed = Color.red(pixel);
                inBlue = Color.blue(pixel);
                inGreen = Color.green(pixel);
                Log.e("Colors", "R:" + inRed + " G:" + inGreen + " B:" + inBlue);
                break;
            }
            case MotionEvent.ACTION_MOVE: {
                Log.e("COORDINATES", "Touch coordinates : x" + String.valueOf(x) + "y" + String.valueOf(y));

                img_must_cities.setX(x);
                img_must_cities.setY(y);
                img_road_names.setX(x);
                img_road_names.setY(y);
                inRed = Color.red(pixel);
                inBlue = Color.blue(pixel);
                inGreen = Color.green(pixel);
                Log.e("Colors", "R:" + inRed + " G:" + inGreen + " B:" + inBlue);
                break;
            }
        }

    }
    return false;
}

Answer 1

也许你可以试试：

最初，保存x和y，当您检测到ACTION_DROP事件使用getX()和getY()时，如果要记录它们，请将x和y设置为初始值

您可以在此处找到活动的文档：https://developer.android.com/guide/topics/ui/drag-drop.html

用户完成拖动后，图像在帧/相对布局中失去位置

1 个答案: