我正在尝试将ibmcloud连接到我的应用程序。但是无论何时 connectToCloud() 它抛出以下异常。
我知道这个问题在这里问了很多次，但我不能解决这个我是新的安卓系统，我不能解决这个问题。请告诉我怎么解决这个问题。

D/com.iwavesys.iwave_trakr.IBMCloud.IBMConnect: .connectDevice() entered
I/System.out:*************CLIENT_ID*********d:z5g5sd:OBDII_Device:AndroidDEV01
    connectionURI tcp://z5g5sd.messaging.internetofthings.ibmcloud.com:1883
I/System.out: IMEI:  123568689090005
D/com.iwavesys.iwave_trakr.IBMCloud.IBMConnect: .isMqttConnected() entered
I/System.out:*************CLIENT_ID*********d:z5g5sd:OBDII_Device:AndroidDEV01
I/System.out: Inside try block ............
    Client value : org.eclipse.paho.android.service.MqttAndroidClient@54a8c99
D/com.iwavesys.iwave_trakr.IBMCloud.IBMConnect: .isMqttConnected() - returning false
I/System.out: client is : org.eclipse.paho.android.service.MqttAndroidClient@eeaab5e
D/com.iwavesys.iwave_trakr.IBMCloud.IBMConnect: Connecting to server : tcp://z5g5sd.messaging.internetofthings.ibmcloud.com:1883
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
W/System.err:     at android.content.ComponentName.<init>(ComponentName.java:117)
        at android.content.Intent.setClassName(Intent.java:9573)
W/System.err:     at org.eclipse.paho.android.service.MqttAndroidClient.connect(MqttAndroidClient.java:407)
        at com.iwavesys.iwave_trakr.IBMCloud.IBMConnect.connectToCloud(IBMConnect.java:248)
        at com.iwavesys.iwave_trakr.MainActivity$8.run(MainActivity.java:658)
        at java.lang.Thread.run(Thread.java:764)

下面是代码中问题所在的部分：
mainactivity.java:

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, ConnectivityReceiver.ConnectivityReceiverListener 
{
        ............
        ............

        static Context g_context;
            @SuppressLint("StaticFieldLeak")
            public static Context context;

            public static MainActivity getInstance() {
                if (instance == null) {
                    instance = new MainActivity();
                }
                return instance;
            }
            public static Context getContext() {
                return context;
            }

         @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);
                ...............
                ...............
         g_context = context;

                context = getApplicationContext();
                ...........
                ...........
        }

          public void new_session() {
                // Wait till connection
                //(!(con_stat.equals("Connected"))) {
                    System.out.println("new_Session Function.....");
                    System.out.println("Context : " +context);
                    //c_ibm.SubscribeToCloud(this);
                    proceed_to_connect();
                }

         public void proceed_to_connect() {
                MainActivity.getInstance().wascalled = true;
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Looper.prepare();
                            System.out.println("In proceed to Connect Function");
                            System.out.println("Context Value : " + context);
                            c_ibm = new IBMConnect(context, MainActivity.getInstance());
                            c_ibm.connectToCloud(context);
                            int status = 1;
                            statusConnected(status);
                        } catch (Exception e) {
                            e.printStackTrace();
                            Log.e(LOG_TAG, "Exception occurred when generating new private key and certificate.", e);
                        }
                    }
                }).start();
        }

ibmconnect.java文件：

public class IBMConnect {
 private static IBMConnect instance;
    private static MqttAndroidClient client;
    private Context context;
    static MainActivity m_act;

    private String organization = "xyz";
    private String deviceType = "xyz_Device";
    private String deviceID = "xyz001";
    private String authorizationToken = "xyz123";
 private MqttCallback callbacks = null;
    private IMqttActionListener listener = null;

    protected MqttAsyncClient mqttAsyncClient = null;
    protected volatile boolean disconnectRequested = false;
    protected MqttClient mqttClient = null;
    private ConnectionListener connectionListener;

    public IBMConnect(Context context, MainActivity act) {
        this.context = context;
        this.client = null;
        m_act = act;
    }
   public static IBMConnect getInstance(Context context) {
        Log.d(TAG, ".getInstance() entered");
        if (instance == null) {
            instance = new IBMConnect(context, m_act);
        }
        return instance;
    }

/**Connect to the Waston Internet of Things Platform
     * @param context
     */
    public void connectToCloud (Context  context ) throws MqttException, KeyManagementException, NoSuchAlgorithmException {
        //public IMqttToken connectToCloud (IoTCallbacks callbacks, IoTActionListener listener, SocketFactory factory) throws MqttException {
        Log.d(TAG, ".connectDevice() entered");
        String clientID = "d:" + this.getOrganization() + ":" + this.getDeviceType() + ":" + this.getDeviceID();
        System.out.println("*************CLIENT_ID*********" + clientID);

        String connectionURI;
        SocketFactory factory = null;
        if (factory == null || this.getOrganization().equals("quickstart")) {
            connectionURI = "tcp://" + this.getOrganization() + IOT_ORGANIZATION_TCP;
            System.out.println("connectionURI " + connectionURI);
        } else {
            connectionURI = "ssl://" + this.getOrganization() + IOT_ORGANIZATION_SSL;
            System.out.println("connectionURI " + connectionURI);
        }
        imei = get_imei();
        previmei = imei;

        if (!isMqttConnected()) {
            if (client != null) {
                client.unregisterResources();
                client = null;
            }
            client = new MqttAndroidClient(context, connectionURI, clientID);
            System.out.println("client is : " + client);
            client.setCallback(callbacks);
            String username = IOT_DEVICE_USERNAME;
            char[] password = this.getAuthorizationToken().toCharArray();

            MqttConnectOptions options = new MqttConnectOptions();
            options.setCleanSession(true);
            options.setUserName(username);
            options.setPassword(password);
            options.setConnectionTimeout(30);
            options.setAutomaticReconnect(true);
            options.setKeepAliveInterval(10);

            if (factory != null && !this.getOrganization().equals("quickstart")) {
                options.setSocketFactory(factory);
            }
            Log.d(TAG, "Connecting to server : " + connectionURI);
              try {
                **client.connect(options, context, listener);**//Getting error in this line
                  return;
                 //return client.connect();
            } catch (MqttException e) {
                Log.e (TAG, "Exception caught while attempting to connect to server ", e.getCause());
                throw e;
            }
readstatus();
}

我得到一个错误 client.connect(options, context, listener); 这条线。我在哪里失踪？？任何人，请帮我解决这个错误。
谢谢您。。。