屏幕亮度調(diào)節(jié)模式：

Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC：值為1，自動(dòng)調(diào)節(jié)亮度。

Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL：值為0，手動(dòng)模式。

設(shè)置屏幕亮度調(diào)節(jié)模式為手動(dòng)模式

    ContentResolver contentResolver = getActivity().getContentResolver();

    try {

        int mode = Settings.System.getInt(contentResolver,

                Settings.System.SCREEN_BRIGHTNESS_MODE);

        if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {

            Settings.System.putInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS_MODE,

                    Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);

        }

    } catch (Settings.SettingNotFoundException e) {

        e.printStackTrace();
    }
} 

獲取屏幕亮度值

• 屏幕最大亮度為255。
• 屏幕最低亮度為0。
• 屏幕亮度值范圍必須位于：0～255

設(shè)置屏幕亮度

private int getScreenBrightness() {
    ContentResolver contentResolver = getActivity().getContentResolver();
    int defVal = 125;
    return Settings.System.getInt(contentResolver,
            Settings.System.SCREEN_BRIGHTNESS, defVal);
}

設(shè)置系統(tǒng)亮度權(quán)限申明

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>

設(shè)置當(dāng)前窗口亮度

很多視頻應(yīng)用，在touch事件處理屏幕亮度時(shí)，并不是修改的系統(tǒng)亮度值，而是修改當(dāng)前應(yīng)用所在窗口的亮度。具體做法就是修改LayoutParams中的screenBrightness屬性。參考代碼如下：

private void setWindowBrightness(int brightness) {
    Window window = getWindow();
    WindowManager.LayoutParams lp = window.getAttributes();
    lp.screenBrightness = brightness / 255.0f;
    window.setAttributes(lp);
}