Android 设置亮度

写一个个类来调节亮度
使用了ContentResolver来获取手机的亮度,并且需要访问provider来获取实例
先写两个buttom来分别控制增加亮度和减少亮度，xml文件就不写了

先来看看调节亮度的SetBrightness 类
因为如果一开始手机设置了自动调节亮度，则设置亮度就没有意义了，所以要检查手机是否开启了自动设置亮度，如果开启则关闭它,这里要调用Settings.System.SCREEN_BRIGHTNESS_MODE.
先用bool值来判断是否为开启。再写一个手动停止的方法
代码如下：

 //是否开启亮度自动调节
    public static boolean isAutoBrightness(ContentResolver aContentResolver){
         boolean automicBrightness = false;
         try {
             //获得系统设置的亮度调节模式
             automicBrightness = Settings.System.getInt(aContentResolver,
                     Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
         } catch (Settings.SettingNotFoundException e) {
             e.printStackTrace();
         }
         return automicBrightness;
    }

//停止亮度调节
    public static void stopAutoBrightness(Activity activity){
        //设置Activity亮度手工模式
        Settings.System.putInt(activity.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
    }

接下来获取手机当前亮度,要通过Context来使用内容提供器getContentResolver()
再用android.provider.Settings.System.getInt(
resolver,Settings.System.SCREEN_BRIGHTNESS)来得到亮度

 //获取亮度
    public static int getScreenBrightness(Activity activity){
        int nowBrightnessValue = 0;      //当前亮度
        //通过ContentResolver接口访问provider数据，获得实例
        ContentResolver resolver = activity.getContentResolver();
        try {
            nowBrightnessValue = android.provider.Settings.System.getInt(
                                 resolver,Settings.System.SCREEN_BRIGHTNESS);
        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }
        return nowBrightnessValue;
    }

设置亮度功能，先用activity来获取窗口参数，里面的screenBrightness就是亮度的int值，通过改变它来改变亮度,最重要的是通过uri来保存

//设置亮度
 public static void setBirghtness(Activity activity,int brightness){
        WindowManager.LayoutParams lp = activity.getWindow().getAttributes();  //获取窗体属性
        lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);     //获取屏幕亮度
        activity.getWindow().setAttributes(lp);
    }

//保存亮度
 public static void saveBrightness(ContentResolver resolver,int brightness){
        //获取屏幕亮度
        Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");
        android.provider.Settings.System.putInt(resolver,"screen_brightness",brightness);
        resolver.notifyChange(uri,null);
    }

到这里把设置亮度的类给写完了，接下来写mainactivity里面的.

 private void setMyActivityBright(int Brightness){
        SetBrightness.setBirghtness(this,Brightness);

        SetBrightness.saveBrightness(SetBrightness.getResolver(this),Brightness);
    }

    private void getAfterMySetBrightnessValues(){
        brightnessValues = SetBrightness.getScreenBrightness(this);
        Log.e(TAG,"当前手机屏幕亮度值为：" + brightnessValues);
    }

初始化，检查是否为自动调节亮度
SegmentLenght把256的亮度分成了8个区间

 public void getBrightnessFromWindow(){
        //获得是否自动调节亮度
        isAutoBrightness = SetBrightness.isAutoBrightness(SetBrightness.getResolver(this));
        Log.e(TAG,"当前手机是否是自动调节屏幕亮度：" + isAutoBrightness);
        if(isAutoBrightness){
            SetBrightness.stopAutoBrightness(this);
            Log.e(TAG,"关闭了自动调节");
            setMyActivityBright(255 / 2 + 1 );
        }

        SegmentLenght = (255 / 2 + 1) / 4;          //每32为一个区间
        getAfterMySetBrightnessValues();
    }

下面为增加和减小亮度

//如果亮度值大于0，则亮度值设置为原亮度值减去被更改的亮度值
    private void downCurrentActivityBrightnessValues(){
        if(brightnessValues > 0){
            setMyActivityBright(brightnessValues - SegmentLenght);
        }
        getAfterMySetBrightnessValues();
    }

    private void upCurrentActivityBrightnessValues(){
        if(brightnessValues < 255){
            if(brightnessValues + SegmentLenght >=256){
                return ;
            }
            setMyActivityBright(brightnessValues + SegmentLenght);
        }
        getAfterMySetBrightnessValues();
    }

以上完成了设置亮度的功能~

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