Filling the entire screen in multiple screen resolutions, densities

I want to draw a rectangle that fills the entire screen on all Android phones, all resolution, all screen densities.Everything... :) First from what I understand Canvas.drawRect use as dimensions values in pixel. Hope this is correct. Being new to Android I thought that if I simply write like this it will be sufficient, since at this moment there is no Android device with a resolution higher than 1024x1024 pixels:

ScreenWidth = 1024;
ScreenHeight = 1024;
canvas.drawRect(0,0, ScreenWidth, ScreenHeight, mLoadPaint);

But it seems that on some devices this Rectangle doesn't fill the entire screen. What is strange and I can't explain myself is that this doesn't happens always but at a point in time... Anyway it seems that there is a problem with the code so I would like to change it to look 开发者_JAVA技巧something like this, but now sure it metrics.widthPixels and metrics.heightPixels will solve my problem:

wm = (WindowManager) getSystemService(WINDOW_SERVICE);
DisplayMetrics metrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(metrics);
canvas.drawRect(0,0, metrics.widthPixels, metrics.heightPixels, mLoadPaint);

I want to know if this is correct, and if this piece of code will cover all screens, and the rectangle will fill the entire screen. Of course with this approach I will have to take care also of the screen orientation, as it seems that the values are swapped between them when the screen is in Landscape.

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You can try canvas.drawColor(int color)