【Android开发经验】与屏幕亮度调节相关的各种方法整理

public class SystemManager {

private Context mContext;
private static SystemManager sInstance;

private SystemManager(final Context context) {
mContext = context;
}

public static SystemManager init(final Context context) {
if (null == sInstance) {
sInstance = new SystemManager(context);
}
return sInstance;
}

public static SystemManager getInstance() {
return sInstance;
}

// 判断是否是自动调光模式
public boolean isAutoBrightness() {
boolean automicBrightness = false;
try {
ContentResolver resolver = mContext.getContentResolver();
automicBrightness = Settings.System.getInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}

// 设置屏幕亮度
public void setBrightness(Activity activity, int brightness) {
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}

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

// 开启自动调光模式
public void startAutoBrightness() {
ContentResolver resolver = mContext.getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
resolver.notifyChange(uri, null);
}

// 关闭自动调光模式
public void stopAutoBrightness() {
ContentResolver resolver = mContext.getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
resolver.notifyChange(uri, null);
}

// 获得当前屏幕亮度
public int getScreenBrightness() {
int nowBrightnessValue = 0;
try {
ContentResolver resolver = mContext.getContentResolver();
nowBrightnessValue = android.provider.Settings.System.getInt(
resolver, Settings.System.SCREEN_BRIGHTNESS);
} catch (Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}

// 设置光亮模式
public void setBrightnessMode(int mode) {
Settings.System.putInt(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
}

// 获得亮度模式
public int getBrightnessMode() {
try {
return Settings.System.getInt(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE);
} catch (SettingNotFoundException e) {
return Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
}
}

}