屏幕亮度调节
//设置应用中的亮度 不保存
public void Brightness(View view){
boolean autoBrightness = BrightnessTools.isAutoBrightness(getContentResolver());
if (autoBrightness) {
T.showLong(this, "关闭自动调节亮度");
BrightnessTools.stopAutoBrightness(this);
}
BrightnessTools.setBrightness(this, 255);
T.showLong(this, "亮度已经设置为了最大");
}
//获取当前亮度 并设置最大的亮度保存
public void saveBrightness(View view){
int screenBrightness = BrightnessTools.getScreenBrightness(this);
T.showLong(this, "当前屏幕亮度为："+screenBrightness);
BrightnessTools.saveBrightness(getContentResolver(), 255);
}
//开启关闭自动调节亮度
public void offAuto(View view){
boolean autoBrightness = BrightnessTools.isAutoBrightness(getContentResolver());
if (autoBrightness) {
T.showLong(this, "关闭自动调节亮度");
BrightnessTools.stopAutoBrightness(this);
}else {
T.showLong(this, "开启自动调节亮度");
BrightnessTools.startAutoBrightness(this);
}
}
import android.app.Activity;
import android.content.ContentResolver;
import android.net.Uri;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.util.Log;
import android.view.WindowManager;
/* Android的屏幕亮度好像在2.1+的时候提供了自动调节的功能，
* 所以，如果当开启自动调节功能的时候， 我们进行调节好像是没有一点作用的，
* 这点让我很是无语，结果只有进行判断，看是否开启了屏幕亮度的自动调节功能。
*/
public class BrightnessTools {
/** * 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
* @param activity
* @return
*/
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
* @param activity
* @param brightness
*/
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);
}
// 那么，能设置了，但是为什么还是会出现，设置了，没反映呢？
// 嘿嘿，那是因为，开启了自动调节功能了，那如何关闭呢？这才是最重要的：
/**
* 停止自动亮度调节
* @param activity
*/
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
* @param activity
*/
public static void startAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
}
// 至此，应该说操作亮度的差不多都有了，结束！
// 哎，本来认为是应该结束了，但是悲剧得是，既然像刚才那样设置的话，只能在当前的activity中有作用，一段退出的时候，会发现毫无作用，悲剧，原来是忘记了保存了。汗！
/**
* 保存亮度设置状态
* @param resolver
* @param brightness
*/
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);
}
}
