从屏幕截图中获取像素颜色

Question

I'm taking a screenshot and transform it to Bitmap

Bitmap bitmap = null;
while (bitmap == null) { bitmap = BitmapFactory.decodeFile(path/filename.png); }

then i want to get pixel color

 int pixel = bitmap.getPixel(x, y);
 Log.i("Main", "color: " + "#" + Integer.toHexString(pixel));

and it works, but only when y<130. When y 140 and more i get only black color

2020-06-01 14:43:46.121 17451-17495/com. I/Main: color: #ff000000

screenshot resolution is 1920*1080. When i try load it in ImageView all is OK

Answer 1

for me works to take screenshot like this

Process sh = Runtime.getRuntime().exec("su", null,null);
OutputStream os = sh.getOutputStream();
os.write(("/system/bin/screencap -p " + "/sdcard/img.png").getBytes("ASCII"));
os.flush();
os.close();
sh.waitFor();