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~
