Android 编程下与系统屏幕亮度相关的操作

部分定制的系统应用中需要去操作手机的屏幕亮度，这时候下面的代码可以满足改变屏幕亮度的需求：

1. 清单文件中所需要添加的权限

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

2. 操作系统屏幕亮度的相关代码

/**
 * 获得当前屏幕亮度的模式 SCREEN_BRIGHTNESS_MODE_AUTOMATIC=1 为自动调节屏幕亮度
 * SCREEN_BRIGHTNESS_MODE_MANUAL=0 为手动调节屏幕亮度
 */
private int getScreenMode() {
    int screenMode = 0;
    try {
        screenMode = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE);
    } catch (Exception localException) {

    }
    return screenMode;
}

/**
 * 设置当前屏幕亮度的模式 SCREEN_BRIGHTNESS_MODE_AUTOMATIC=1 为自动调节屏幕亮度
 * SCREEN_BRIGHTNESS_MODE_MANUAL=0 为手动调节屏幕亮度
 */
private void setScreenMode(int paramInt) {
    try {
        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, paramInt);
    } catch (Exception localException) {
        localException.printStackTrace();
    }
}

/**
 * 获得当前屏幕亮度值 0--255
 */
private int getScreenBrightness() {
    int screenBrightness = 255;
    try {
        screenBrightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
    } catch (Exception localException) {

    }
    return screenBrightness;
}

/**
 * 设置当前屏幕亮度值 0--255
 */
private void saveScreenBrightness(int paramInt) {
    try {
        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, paramInt);
    } catch (Exception localException) {
        localException.printStackTrace();
    }
}

/**
 * 保存当前的屏幕亮度值，并使之生效
 */
private void setScreenBrightness(int paramInt) {
    Window localWindow = getWindow();
    WindowManager.LayoutParams localLayoutParams = localWindow.getAttributes();
    float f = paramInt / 255.0F;
    localLayoutParams.screenBrightness = f;
    localWindow.setAttributes(localLayoutParams);
}