Исключение времени выполнения Java: невозможно запустить активность componentInfo

Я создаю приложение для связи с радиоуправляемой лодкой с помощью Bluetooth. Но на устройстве происходит сбой с сообщением «к сожалению, приложение Wheeler остановлено». Итак, я запустил его в эмуляторе, зная, что исключение нулевого указателя будет выдано в строке 111, поскольку это не настоящее устройство, пытаясь выяснить, что вызывает исключение времени выполнения, говорящее «Невозможно запустить активность ComponentInfo». Вот мой полный код -

package com.in2gravity.wheeler;
package com.in2gravity.wheeler;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

private BluetoothAdapter mBluetoothAdapter;
private BluetoothDevice mDevice;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
Handler mHandler;
private byte[] up, down, left, right, g1, g2, g3, g4, launch, dock;


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

    //Buttons Enlisting
    Button upnavbutton , downnavbutton, leftnavbutton, rightnavbutton,gearup1, gearup2, geardown1, geardown2, launchbutton, dockbutton;
    // texts Enlisting & id registration
    TextView propellerText = (TextView)findViewById(R.id.propellerText);
    TextView in2gravityText = (TextView)findViewById(R.id.in2gravityText);
    TextView timerText = (TextView)findViewById(R.id.timerText);
    // imageview enlisting & id registration
    ImageView appLogo = (ImageView)findViewById(R.id.appLogo);
    //chronometer enlisting & id registration
    Chronometer timer = (Chronometer)findViewById(R.id.chronometer1);
    //button id registration
    upnavbutton = (Button)findViewById(R.id.upnavbutton);
    downnavbutton = (Button)findViewById(R.id.downnavbutton);
    leftnavbutton = (Button)findViewById(R.id.leftnavbutton);
    rightnavbutton = (Button)findViewById(R.id.rightnavbutton);
    gearup1 = (Button)findViewById(R.id.gearbutton3);
    gearup2 = (Button)findViewById(R.id.gearbutton4);
    geardown2 = (Button)findViewById(R.id.gearbutton2);
    geardown1 = (Button)findViewById(R.id.gearbutton1);
    launchbutton = (Button)findViewById(R.id.launchbutton);
    dockbutton = (Button)findViewById(R.id.dockbutton);
    // setting onclick listener to this class

    upnavbutton.setOnClickListener(this);
    downnavbutton.setOnClickListener(this);
    leftnavbutton.setOnClickListener(this);
    rightnavbutton.setOnClickListener(this);
    launchbutton.setOnClickListener(this);
    dockbutton.setOnClickListener(this);
    gearup1.setOnClickListener(this);
    gearup2.setOnClickListener(this);
    geardown2.setOnClickListener(this);
    geardown1.setOnClickListener(this);
    // converting strings to bytes for further use
    up = "u".getBytes();
    down = "d".getBytes();
    left = "l".getBytes();
    right = "r".getBytes();
    launch = "L".getBytes();
    dock = "D".getBytes();
    g1 = "1".getBytes();
    g2 = "2".getBytes();
    g3 = "3".getBytes();
    g4 = "4".getBytes();

    mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
            byte[] writeBuf = (byte[]) msg.obj;
            int begin = (int)msg.arg1;
            int end = (int)msg.arg2;
            switch(msg.what) {
            case 1:
            String writeMessage = new String(writeBuf);
            writeMessage = writeMessage.substring(begin, end);
            break;
            }
            }
            };

    Intent enableBluetooth = null;      
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if(mBluetoothAdapter== null){
        String tag = null;
        // no bluetooth support!
        Log.e(tag, "Bluetooth is not supported in this device");
    }
    if(!mBluetoothAdapter.isEnabled()){
        enableBluetooth = new   Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBluetooth, 1);
    }
    Set<BluetoothDevice> pairedDevices =  mBluetoothAdapter.getBondedDevices();
    if(pairedDevices.size() > 0){
        for(BluetoothDevice device : pairedDevices){
            mDevice = device;
        }
    }
    mConnectThread = new ConnectThread(mDevice);
    mConnectThread.start();

//  if (savedInstanceState == null) {
//      getFragmentManager().beginTransaction()
//              .add(R.id.container, new PlaceholderFragment()).commit();
//  }

}

Подключить класс потока:

private class ConnectThread extends Thread{

            private final BluetoothSocket mmSocket;
            private final BluetoothDevice mmDevice;
            private final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");


            public ConnectThread(BluetoothDevice device){
                BluetoothSocket tmp =null;
                mmDevice= device;
                try {
                    tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
                } catch (IOException e) {}
                    // TODO Auto-generated catch block

                    mmSocket =tmp;
                }
                public void run() {
                    mBluetoothAdapter.cancelDiscovery();
                    try {
                    mmSocket.connect();
                    } catch (IOException connectException) {
                    try {
                    mmSocket.close();
                    } catch (IOException closeException) {
                        return; 

                    }

                    } 
                    mConnectedThread = new ConnectedThread(mmSocket);
                    mConnectedThread.start();
                    }
                    public void cancel() {
                    try {
                    mmSocket.close();
                    } catch (IOException e) { }
            }
         }

Класс подключенного потока:

    private  class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;
        try {
        tmpIn = socket.getInputStream();
        tmpOut = socket.getOutputStream();
        } catch (IOException e) { 

        }
        mmInStream = tmpIn;
        mmOutStream = tmpOut;
        }
        public void run() {
        byte[] buffer = new byte[1024];
        int begin = 0;
        int bytes = 0;
        while (true) {
        try {
        bytes += mmInStream.read(buffer, bytes, buffer.length - bytes);
        for(int i = begin; i < bytes; i++) {
        if(buffer[i] == "#".getBytes()[0]) {
        mHandler.obtainMessage(1, begin, i, buffer).sendToTarget();
        begin = i + 1;
        if(i == bytes - 1) {
        bytes = 0;
        begin = 0;
            }
        }
        }
        } catch (IOException e) {
        break;
        }
        }
        }
        public void write(byte[] bytes) {
        try {
        mmOutStream.write(bytes);
        } catch (IOException e) { e.printStackTrace(); }
        }
        public void cancel() {
        try {
        mmSocket.close();
        } catch (IOException e) {

        }
        }
        }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch(v.getId()){
        case R.id.launchbutton:

            //when launch button pressed
            mConnectedThread.write(launch);

            break;
        case R.id.dockbutton :
            //when dock button pressed
            mConnectedThread.write(dock);

            break;
        case R.id.upnavbutton :
            //when dock button pressed
            mConnectedThread.write(up);

            break;
        case R.id.downnavbutton :
            //when dock button pressed
            mConnectedThread.write(down);

            break;
        case R.id.leftnavbutton :
            //when dock button pressed
            mConnectedThread.write(left);

            break;
        case R.id.rightnavbutton :
            //when dock button pressed
            mConnectedThread.write(right);

            break;
        case R.id.gearbutton1 :
            //when dock button pressed
            mConnectedThread.write(g1);

            break;
        case R.id.gearbutton2 :
            //when dock button pressed
            mConnectedThread.write(g2);

            break;
        case R.id.gearbutton3 :
            //when dock button pressed
            mConnectedThread.write(g4);

            break;
        case R.id.gearbutton4 :
            //when dock button pressed
            mConnectedThread.write(g3);

            break;
        }
        }

   }

Логкат:

04-10 06:27:33.389: D/dalvikvm(2489): GC_FOR_ALLOC освобождено 51K, 5% свободно 2977K/3124K, пауза 64мс, всего 68мс

04-10 06:27:33.629: D/dalvikvm(2489): GC_FOR_ALLOC освободил 5K, 4% освободил 3425K/3568K, приостановил 5 мс, всего 5 мс

04-10 06:27:33.729: E/BluetoothAdapter(2489): привязка Bluetooth пуста

04-10 06:27:33.729: E/(2489): Bluetooth не поддерживается на этом устройстве

04-10 06:27:33.729: D/AndroidRuntime(2489): завершение работы виртуальной машины

04-10 06:27:33.729: W/dalvikvm(2489): threadid=1: поток завершается с необработанным исключением (group=0xb3cd2b20)

04-10 06:27:33.829: E/AndroidRuntime(2489): НЕИСПРАВНОЕ ИСКЛЮЧЕНИЕ: основной

04-10 06:27:33.829: E/AndroidRuntime(2489): Процесс: com.in2gravity.wheeler, PID: 2489

04-10 06:27:33.829: E/AndroidRuntime(2489): java.lang.RuntimeException: невозможно запустить активность ComponentInfo

{com.in2gravity.wheeler/com.in2gravity.wheeler.MainActivity}: java.lang.NullPointerException

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.ActivityThread.access$800(ActivityThread.java:135)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.os.Handler.dispatchMessage(Handler.java:102)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.os.Looper.loop(Looper.java:136)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.ActivityThread.main(ActivityThread.java:5017)

04–10 06:27:33.829: E/AndroidRuntime (2489): в java.lang.reflect.Method.invokeNative (собственный метод)

04-10 06:27:33.829: E/AndroidRuntime(2489): в java.lang.reflect.Method.invoke(Method.java:515)

04-10 06:27:33.829: E/AndroidRuntime(2489): в com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

04-10 06:27:33.829: E/AndroidRuntime(2489): в com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

04–10 06:27:33.829: E/AndroidRuntime (2489): в dalvik.system.NativeStart.main (собственный метод)

04-10 06:27:33.829: E/AndroidRuntime(2489): Причина: java.lang.NullPointerException

04-10 06:27:33.829: E/AndroidRuntime(2489): в com.in2gravity.wheeler.MainActivity.onCreate(MainActivity.java:112)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.Activity.performCreate(Activity.java:5231)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

04-10 06:27:33.829: E/AndroidRuntime(2489): в android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)

04-10 06:27:33.829: E/AndroidRuntime(2489): ... еще 11

Activity_main.xml:

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<ImageView
    android:id="@+id/appLogo"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:contentDescription="@string/app_logo"
    android:src="@drawable/wheelerapp_logo2" />

<Button
    android:id="@+id/upnavbutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/appLogo"
    android:layout_centerHorizontal="true"
    android:background="@drawable/upnavbutton" />

<Button
    android:id="@+id/downnavbutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/upnavbutton"
    android:layout_below="@+id/appLogo"
    android:background="@drawable/upnavbutton"
    android:rotation="180" />

<Button
    android:id="@+id/rightnavbutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_marginLeft="8dp"
    android:layout_toRightOf="@+id/appLogo"
    android:background="@drawable/rightnavbutton" />

<Chronometer
    android:id="@+id/chronometer1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/downnavbutton"
    android:layout_alignLeft="@+id/leftnavbutton"
    android:layout_marginLeft="16dp"
    android:text="Chronometer"
    tools:ignore="HardcodedText" />

<TextView
    android:id="@+id/propellerText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/leftnavbutton"
    android:layout_alignLeft="@+id/launchbutton"
    android:text="@string/Propeller_Text"
    android:textAppearance="?android:attr/textAppearanceSmall" />

<TextView
    android:id="@+id/in2gravityText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/chronometer1"
    android:layout_alignBottom="@+id/chronometer1"
    android:layout_alignLeft="@+id/propellerText"
    android:text="@string/in2gravity_text"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<Button
    android:id="@+id/launchbutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/rightnavbutton"
    android:layout_alignRight="@+id/rightnavbutton"
    android:layout_marginRight="14dp"
    android:background="@android:color/holo_green_light"
    android:text="@string/launchbutton_text" />

<Button
    android:id="@+id/dockbutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/rightnavbutton"
    android:layout_alignLeft="@+id/chronometer1"
    android:background="@android:color/holo_red_light"
    android:text="@string/Dockbutton_text" />

<Button
    android:id="@+id/leftnavbutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/rightnavbutton"
    android:layout_marginRight="10dp"
    android:layout_marginTop="7dp"
    android:layout_toLeftOf="@+id/appLogo"
    android:background="@drawable/leftnavbutton" />

<Button
    android:id="@+id/gearbutton3"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/launchbutton"
    android:layout_alignBottom="@+id/launchbutton"
    android:layout_marginLeft="8dp"
    android:layout_toRightOf="@+id/upnavbutton"
    android:background="@android:color/holo_blue_light"
    android:text="@string/gearup2_text" />

<Button
    android:id="@+id/gearbutton4"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/gearbutton3"
    android:layout_toLeftOf="@+id/upnavbutton"
    android:background="@android:color/holo_purple"
    android:text="@string/gearup1_text" />

<Button
    android:id="@+id/gearbutton1"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/rightnavbutton"
    android:layout_toLeftOf="@+id/downnavbutton"
    android:background="@android:color/holo_orange_light"
    android:text="@string/geardown2_text" />

<Button
    android:id="@+id/gearbutton2"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/gearbutton3"
    android:layout_alignTop="@+id/gearbutton1"
    android:background="@android:color/holo_orange_dark"
    android:text="@string/geardown1_text" />

<TextView
    android:id="@+id/timerText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/leftnavbutton"
    android:layout_alignParentLeft="true"
    android:layout_marginLeft="9dp"
    android:text="@string/timer_text"
    android:textAppearance="?android:attr/textAppearanceSmall" />

   </RelativeLayout>

Манифест андроида:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.in2gravity.wheeler"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="15"
    android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

<application
    android:icon="@drawable/wheelerapp_logo2"
    android:label="@string/app_name"

    android:theme="@style/AppBaseTheme" android:allowBackup="true">
    <activity
     android:screenOrientation="landscape"
        android:name="com.in2gravity.wheeler.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

Примечание. Я использую настраиваемые кнопки в этом приложении, если это поможет. Среди 10 кнопок есть одна (все устроены одинаково) upnavbutton.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

<item android:state_enabled="true" 
 android:state_pressed="true"      android:drawable="@drawable/upnavbutton_pressed" />
<item android:state_enabled="true"
 android:drawable="@drawable/upnavbutton_normal" />

</selector>