CustomMapView.java 文件源码

private int detectBestPixelFormat() {

        //Skip check if this is a new device as it will be RGBA_8888 by default.
        if (isRGBA_8888ByDefault) {
            return PixelFormat.RGBA_8888;
        }

        Context context = getContext();
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();

        //Get display pixel format
        int displayFormat = display.getPixelFormat();

        if ( PixelFormat.formatHasAlpha(displayFormat) ) {
            return displayFormat;
        } else {
            return PixelFormat.RGB_565;//Fallback for those who don't support Alpha
        }
    }