Android开发实现调节屏幕亮度功能
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2021-01-20
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Android开发实现调节屏幕亮度功能开发实现调节屏幕亮度功能
本文实例讲述了Android开发实现调节屏幕亮度功能。分享给大家供大家参考，具体如下：
在很多app中进入二维码显示界面时会自动调整屏幕亮度，那么如何实现调节app的屏幕亮度呢？下面我来为大家介绍：
注注:调节屏幕亮度的核心思想就是对安卓系统提供的ContentProvider进行操作
1、声明权限、声明权限
需要允许用户修改系统配置
<uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
2、具体操作、具体操作
/**
* 判断是否开启了自动亮度调节
*/
public static boolean isAutoBrightness(Context context) {
ContentResolver resolver = context.getContentResolver();
boolean automicBrightness = false;
try {
automicBrightness = Settings.System.getInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (Settings.SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
/**
* 获取屏幕的亮度
*/
public static int getScreenBrightness(Context context) {
int nowBrightnessValue = 0;
ContentResolver resolver = context.getContentResolver();
try {
nowBrightnessValue = android.provider.Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS);
} catch (Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
/**
* 设置当前Activity显示时的亮度
* 屏幕亮度最大数值一般为255，各款手机有所不同
* screenBrightness 的取值范围在[0,1]之间
*/
public static void setBrightness(Activity activity, int brightness) {
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}
/**
* 开启关闭自动亮度调节
*/
public static boolean autoBrightness(Context activity, boolean flag) {
int value = 0;
if (flag) {
value = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; //开启
} else {
value = Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;//关闭
}
return Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
value);
}
/**
* 保存亮度设置状态，退出app也能保持设置状态
*/
public static void saveBrightness(Context context, int brightness) {
ContentResolver resolver = context.getContentResolver();
Uri uri = android.provider.Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, brightness);
resolver.notifyChange(uri, null);
}
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