Andengine&Thinkgear更新线程空指针

Question

我正在构建一个游戏，当耳机连接到GameScene时，它会尝试连接到耳机。该项目有一个主要活动(称为活动)和8个独立的课程(4个场景，扩展basecene，baseScene课程，ResourcesManager和SceneManager)；

唯一的办法是，如果我有所有的活动类的TG代码，但我需要它在GameScene.java中，因为处理程序将设置速度，对象的大小等。这个错误要了我的命

03-25 16:56:04.865  30101-30160/g5.mindwave E/AndroidRuntime﹕ FATAL EXCEPTION: UpdateThread
Process: g5.mindwave, PID: 30101
java.lang.NullPointerException
        at g5.mindwave.Activity.connect(Activity.java:57)
        at g5.mindwave.GameScene.ThinkGear(GameScene.java:142)
        at g5.mindwave.GameScene.createScene(GameScene.java:123)
        at g5.mindwave.BaseScene.<init>(BaseScene.java:42)
        at g5.mindwave.GameScene.<init>(GameScene.java:34)
        at g5.mindwave.SceneManager$1.onTimePassed(SceneManager.java:130)
        at org.andengine.engine.handler.timer.TimerHandler.onUpdate(TimerHandler.java:94)
        at org.andengine.engine.handler.UpdateHandlerList.onUpdate(UpdateHandlerList.java:47)
        at org.andengine.engine.Engine.onUpdateUpdateHandlers(Engine.java:618)
        at org.andengine.engine.Engine.onUpdate(Engine.java:605)
        at org.andengine.engine.LimitedFPSEngine.onUpdate(LimitedFPSEngine.java:57)
        at org.andengine.engine.Engine.onTickUpdate(Engine.java:568)
        at org.andengine.engine.Engine$UpdateThread.run(Engine.java:858)

Activity.java：

public void connect(TGDevice tg)

{tg.connect(true);}

GameScene.java：

 @Override
public void createScene() {
engine.registerUpdateHandler(new FPSLogger());
    engine.runOnUpdateThread(new Runnable() {
                                 @Override
                                 public void run() {
                                     handler = new Handler(Looper.getMainLooper()) {

                                         @Override
                                         public void handleMessage(Message msg) {
                                             switch (msg.what) {
                                                 case TGDevice.MSG_STATE_CHANGE:
                                                     Log.v("HelloEEG","State changed");
                                                     switch (msg.arg1) {
                                                         case TGDevice.STATE_IDLE: break;
                                                         case TGDevice.STATE_CONNECTING:
                                                             Log.v("HelloEEG","Connecting");
                                                             Toast connecting = Toast.makeText(activity.getApplicationContext(),"Connecting", Toast.LENGTH_SHORT);
                                                             connecting.show();
                                                             break;
                                                         case TGDevice.STATE_CONNECTED: tgDevice.start();
                                                             Log.v("HelloEEG","Connected");
                                                             //TODO Start the wheels spinning, timer, etc.

                                                             Toast connected = Toast.makeText(activity.getApplicationContext(),"Connected to "+tgDevice.getConnectedDevice().getName(), Toast.LENGTH_SHORT);
                                                             connected.show();
                                                             break;
                                                         case TGDevice.STATE_DISCONNECTED:
                                                             Toast disconnected = Toast.makeText(activity.getApplicationContext(),"Disconnected", Toast.LENGTH_SHORT);
                                                             disconnected.show();
                                                             break;
                                                         case TGDevice.STATE_NOT_FOUND: case TGDevice.STATE_NOT_PAIRED: default:
                                                             break;

                                                     } break; case TGDevice.MSG_POOR_SIGNAL:
                                                     // Log.v("HelloEEG", "PoorSignal: " + msg.arg1);

                                                 case TGDevice.MSG_ATTENTION:
                                                     Log.v("HelloEEG", "Attention: " + msg.arg1);


                                                     break;
                                                 case TGDevice.MSG_BLINK:
                                                     //Log.v("HelloEEG", "Blinks:" + msg.arg1);
                                                     break;
                                                 case TGDevice.MSG_MEDITATION:
                                                     Log.v("HelloEEG", "Meditation:" +msg.arg1);
                                                     rj2.setMotorSpeed(msg.arg1);
                                                     //  progressMeditation.setProgress(msg.arg1);
                                                     break;
                                                 case TGDevice.MSG_RAW_DATA:
                                                     // int rawValue = msg.arg1;
                                                     // Log.v("HelloEEG", "Raw Data: "+ rawValue);
                                                     break;
                                                 case TGDevice.MSG_EEG_POWER:

                                                     TGEegPower ep = (TGEegPower)msg.obj;
                                                     //Log.v("HelloEEG", "Delta: " + ep.delta); default:
                                                     break;
                                             }
                                         }
                                     };
                                 }
                             }
    );

    CreateWorld();
    createCar();
    SetCamera();
    ThinkGear();

}
public void ThinkGear() {

       engine.runOnUpdateThread(new Runnable() {
           @Override
           public void run() {
               if (resourcesManager.btAdapter != null) {
                   Log.v("test",resourcesManager.btAdapter.getName());
                   tgDevice = new TGDevice(btAdapter, handler);
                   Log.v("tst", tgDevice.toString());
             //  tgDevice.connect(true);
                   Log.v("Device", "" + tgDevice.getState());
           }
       }

       });

resourcesManager.activity.connect(tgDevice);
}

Answer 1

我的愚蠢是没有限制的，我试着从两个不同的主题连接，下面是我是如何做到的：

GameScene.java：

 public void createScene() {
engine.registerUpdateHandler(new FPSLogger());
    engine.runOnUpdateThread(new Runnable() {
                                 @Override
                                 public void run() {

                                     handler = new Handler(Looper.getMainLooper()) {

                                         @Override
                                         public void handleMessage(Message msg) {
                                             switch (msg.what) {
                                                 case TGDevice.MSG_STATE_CHANGE:
                                                     Log.v("HelloEEG","State changed");
                                                     switch (msg.arg1) {
                                                         case TGDevice.STATE_IDLE: break;
                                                         case TGDevice.STATE_CONNECTING:
                                                             Log.v("HelloEEG","Connecting");
                                                             Toast connecting = Toast.makeText(activity.getApplicationContext(),"Connecting", Toast.LENGTH_SHORT);
                                                             connecting.show();
                                                             break;
                                                         case TGDevice.STATE_CONNECTED: tgDevice.start();
                                                             Log.v("HelloEEG","Connected");
                                                             //TODO Start the wheels spinning, timer, etc.

                                                             Toast connected = Toast.makeText(activity.getApplicationContext(),"Connected to "+tgDevice.getConnectedDevice().getName(), Toast.LENGTH_SHORT);
                                                             connected.show();
                                                             break;
                                                         case TGDevice.STATE_DISCONNECTED:
                                                             Toast disconnected = Toast.makeText(activity.getApplicationContext(),"Disconnected", Toast.LENGTH_SHORT);
                                                             disconnected.show();
                                                             break;
                                                         case TGDevice.STATE_NOT_FOUND: case TGDevice.STATE_NOT_PAIRED: default:
                                                             break;

                                                     } break; case TGDevice.MSG_POOR_SIGNAL:
                                                     // Log.v("HelloEEG", "PoorSignal: " + msg.arg1);

                                                 case TGDevice.MSG_ATTENTION:
                                                     Log.v("HelloEEG", "Attention: " + msg.arg1);


                                                     break;
                                                 case TGDevice.MSG_BLINK:
                                                     //Log.v("HelloEEG", "Blinks:" + msg.arg1);
                                                     break;
                                                 case TGDevice.MSG_MEDITATION:
                                                     Log.v("HelloEEG", "Meditation:" +msg.arg1);
                                                     rj2.setMotorSpeed(msg.arg1);
                                                     //  progressMeditation.setProgress(msg.arg1);
                                                     break;
                                                 case TGDevice.MSG_RAW_DATA:
                                                     // int rawValue = msg.arg1;
                                                     // Log.v("HelloEEG", "Raw Data: "+ rawValue);
                                                     break;
                                                 case TGDevice.MSG_EEG_POWER:

                                                     TGEegPower ep = (TGEegPower)msg.obj;
                                                     //Log.v("HelloEEG", "Delta: " + ep.delta); default:
                                                     break;
                                             }
                                         }
                                     };
                                     if (resourcesManager.btAdapter != null) {
                                         Log.v("test",resourcesManager.btAdapter.getName());
                                         tgDevice = new TGDevice(btAdapter, handler);
                                         Log.v("tst", tgDevice.toString());
                                           tgDevice.connect(true);
                                         Log.v("Device", "" + tgDevice.getState());
                                     }
                                 }
                             }
    );

    CreateWorld();
    createCar();
    SetCamera();
   // ThinkGear();

}