Android获取并设置Activity的亮度

此API只适合2.1以上版本：

/** * 判断是否开启了自动亮度调节 *  * @param aContext * @return */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);activity.getWindow().setAttributes(lp);}/** * 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,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);}/** * 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.notifyChange(uri, null);}

使用SeekBar进行亮度控制：

sSeekBar = (SeekBar) findViewById(R.id.seek_bar);sSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {if (progress < 10) {} else {setBrightness(Test2Activity.this, progress);}}});//获取当前亮度的位置int a =getScreenBrightness(this);sSeekBar.setProgress(a);

    <SeekBar        android:id="@+id/seek_bar"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:max="255"        android:maxHeight="8dp"        android:minHeight="8dp"        android:paddingBottom="5dp"        android:paddingLeft="13dp"        android:paddingRight="13dp"        android:progress="0"         />

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