本文实例讲述了Android编程获取并设置Activity亮度的方法。分享给大家供大家参考，具体如下：
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() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public 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" />
希望本文所述对大家Android程序设计有所帮助。