Android canvas change background color
Create a paint
Paint myPaint = new Paint();
myPaint.setColor(res.getColor(R.color.white));
And set your canvas
canvas.draw...(... , myPaint);
if you want to change the background color of Canvas try this:
canvas.drawColor(ContextCompat.getColor(getContext(), R.color.yourColor));
Try this:
/*
* A = Alpha a.k.a. transparency
* R = Red color
* G = Green color
* B = Blue color
*
* All of them have a range from 0 to 255
*/
canvas.drawARGB(0, 225, 225, 255);
Or, as @njzk2 stated, you can also use this one:
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
But I think the first option is better because it is more precise for, as example, if you want to set it less transparent.
Is not what I wanted to achieve but is a workaround and maybe is helpful for somebody, I am putting in invisible the second canvas, and then when is ready, I put it visible back.
@Override
public void lock(String message) {
runOnUiThread(new Runnable() {
@Override
public void run() {
canvasFront.setReadyToDraw(false);
canvasBackground.setVisibility(View.INVISIBLE);
}
});
}
@Override
public void unlock() {
runOnUiThread(new Runnable() {
@Override
public void run() {
drawViewClassroom.setVisibility(View.VISIBLE);
canvasFront.setReadyToDraw(true);
}
});
}