适配天波机器的按键调节音量(目前发现无法弹出音量调节框)

app/src/main/java/com/bgycc/smartcanteen/activity/MainActivity.java

@@ -415,16 +415,18 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         LogUtils.i(TAG, "按键KeyCode: " + keyCode);
         switch (keyCode) {
             case KeyEvent.KEYCODE_PAGE_UP:
+            case KeyEvent.KEYCODE_NUMPAD_ADD:
                 audioManager.adjustStreamVolume(
                         AudioManager.STREAM_SYSTEM,
                         AudioManager.ADJUST_RAISE,
-                        AudioManager.FLAG_SHOW_UI);
+                        AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
                 break;
             case KeyEvent.KEYCODE_PAGE_DOWN:
+            case KeyEvent.KEYCODE_NUMPAD_SUBTRACT:
                 audioManager.adjustStreamVolume(
                         AudioManager.STREAM_SYSTEM,
                         AudioManager.ADJUST_LOWER,
-                        AudioManager.FLAG_SHOW_UI);
+                        AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
                 break;
         }
         return super.onKeyDown(keyCode, event);