关于屏幕亮度的调整可以从以下几个方面入手:
- 判断是否开启了自动亮度调节
public static boolean isAutoBrightness(ContentResolver aContentResolver) {
boolean automicBrightness = false;
try{
automicBrightness = Settings.System.getInt(aContentResolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) ==Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch(SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
- **获取屏幕的亮度 **
public static int getScreenBrightness(Activity activity) {
int nowBrightnessValue = 0;
ContentResolver resolver = activity.getContentResolver();
try{
nowBrightnessValue = android.provider.Settings.System.getInt(resolver,Settings.System.SCREEN_BRIGHTNESS);
} catch(Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
- **设置亮度 **
public static void setBrightness(Activity activity, int brightness) {
// Settings.System.putInt(activity.getContentResolver(),
// Settings.System.SCREEN_BRIGHTNESS_MODE,
// Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
Log.d("lxy", "set lp.screenBrightness == " + lp.screenBrightness);
activity.getWindow().setAttributes(lp);
}
- 停止自动亮度调节
public static void stopAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
- 开启亮度自动调节
public static void startAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
}
- 保存亮度设置状态
public static void saveBrightness(ContentResolver resolver, int brightness) {
Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");
android.provider.Settings.System.putInt(resolver, "screen_brightness", brightness);
// resolver.registerContentObserver(uri, true, myContentObserver);
resolver.notifyChange(uri, null);
}
-
最后
如果只在自己的activity显示期间调节亮度 , 那就直接设置亮度(3)并且关闭自动亮度调节(4) , 当该Activity退出后应该恢复自动亮度调节(5) ;
如果想直接对手机进行设置 , 那设置亮度(3)后 , 应该保存亮度设置状态(6) ;
以上6个方法配合使用即可 .
