Android 亮度

用腾讯点播VOD的demo，跳转到这个页面亮度会变得特别亮，就抽时间看了看API，记录一下：

跳转到该页面的时候：updateCurrentLight()

private void updateCurrentLight() {
    Activity activity = (Activity) mContext;
    Window window = activity.getWindow();

    WindowManager.LayoutParams params = window.getAttributes();
    if (params.screenBrightness == WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE) {
        params.screenBrightness = getActivityBrightness((Activity) mContext);
        window.setAttributes(params);
        if (params.screenBrightness == -1) {
            int systemBrightness = getSystemBrightness();
            mSeekBarLight.setProgress(systemBrightness);
            return;
        }
        mSeekBarLight.setProgress((int) (params.screenBrightness * 255));
    }
}

public static float getActivityBrightness(Activity activity) {
    Window localWindow = activity.getWindow();
    WindowManager.LayoutParams params = localWindow.getAttributes();
    return params.screenBrightness;
}

private int getSystemBrightness() {
    int systemBrightness = 0;
    try {
        systemBrightness = Settings.System.getInt(mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
    } catch (Settings.SettingNotFoundException e) {
        e.printStackTrace();
    }
    return systemBrightness;
}

private SeekBar.OnSeekBarChangeListener mLightChangeListener = new SeekBar.OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
        updateBrightProgress(progress);
    }

    @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
};