当X、Y位于屏幕中心上方时，java无法获得正确的颜色值

Question

无论何时将值传递到位于屏幕中心或低于屏幕中心的x，y，我都会得到正确的像素颜色，但当传递到屏幕中心以上的x，y的值时，我会得到错误的颜色值，下面是我使用的代码

private int getColor(int x, int y){

   Drawable imgDrawable = ((ImageView) mImageView_picture).getDrawable();
   Bitmap bitmap1 = ((BitmapDrawable) imgDrawable).getBitmap();
    Matrix inverse = new Matrix();
    ((ImageView) mImageView_picture).getImageMatrix().invert(inverse);
    float[] touchPoint = new float[]{x, y};
    inverse.mapPoints(touchPoint);
    int xCoord = (int) touchPoint[0];
    int yCoord = (int) touchPoint[1];
    int touchedRGB = bitmap1.getPixel(xCoord,yCoord);
    int redValue = Color.red(touchedRGB);
    int greenValue = Color.green(touchedRGB);
    int blueValue = Color.blue(touchedRGB);
    int alphaValue = Color.alpha(touchedRGB);
    int colorValue = Color.argb(alphaValue, redValue, greenValue, blueValue);
    return colorValue;
}