Android Development: "hilo que sale con la excepción sin atrapar"

Estoy intentando crear mi primera aplicación de Android (un juego) pero tengo algunas dificultades para empezar.

Cuando ejecuto mi código obtengo este registro de errores:

• Cadena aleatoria de la lista de matrices
• MediaRecord no pudo iniciar el emulador Android 7.1.1
• Android: Error de OutOfMemory y el backstack
• Tema de transmisión en vivo
• NoClassDefFoundError al ejecutar PopupMenu usando la biblioteca android-support-v7-appcompat en android

05-25 02:41:51.022: WARN/dalvikvm(634): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): FATAL EXCEPTION: main 05-25 02:41:51.040: ERROR/AndroidRuntime(634): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.stickfigs.nmg/com.stickfigs.nmg.NMG}: java.lang.NullPointerException 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.os.Handler.dispatchMessage(Handler.java:99) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.os.Looper.loop(Looper.java:123) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at java.lang.reflect.Method.invokeNative(Native Method) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at java.lang.reflect.Method.invoke(Method.java:521) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at dalvik.system.NativeStart.main(Native Method) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): Caused by: java.lang.NullPointerException 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at com.stickfigs.nmg.NMG.onCreate(NMG.java:32) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-25 02:41:51.040: ERROR/AndroidRuntime(634): ... 11 more 05-25 02:41:51.062: WARN/ActivityManager(59): Force finishing activity com.stickfigs.nmg/.NMG 

Creo que el problema es este "hilo saliendo con excepción sin atrapar" parte, no tengo ni idea de lo que la excepción podría ser o lo que está causando.

Aquí está mi código:

NMGView.java: paquete com.stickfigs.NMG;

 import android.content.Context; import android.os.Bundle; import android.util.AttributeSet; import android.view.SurfaceHolder; import android.view.SurfaceView; class NMGView extends SurfaceView implements SurfaceHolder.Callback { class NMGThread extends Thread { //State-tracking constants public static final int STATE_LOSE = 1; public static final int STATE_PAUSE = 2; public static final int STATE_READY = 3; public static final int STATE_RUNNING = 4; public static final int STATE_WIN = 5; /** The state of the game. One of READY, RUNNING, PAUSE, LOSE, or WIN */ private int mode; /** Handle to the surface manager object we interact with */ private SurfaceHolder surfaceHolder; public NMGThread(SurfaceHolder surfaceHolderc, Context contextc) { // get handles to some important objects surfaceHolder = surfaceHolderc; context = contextc; } /** * Restores game state from the indicated Bundle. Typically called when * the Activity is being restored after having been previously * destroyed. * * @param savedState Bundle containing the game state */ public synchronized void restoreState(Bundle savedState) { synchronized (surfaceHolder) { setState(STATE_PAUSE); } } /** * Sets the game mode. That is, whether we are running, paused, in the * failure state, in the victory state, etc. * * @param mode one of the STATE_* constants * @param message string to add to screen or null */ public void setState(int modec) { synchronized (surfaceHolder) { mode = modec; } } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub } /** Handle to the application context, used to eg fetch Drawables. */ private Context context; /** The thread that actually draws the animation */ private NMGThread thread; public NMGView(Context context, AttributeSet attrs) { super(context, attrs); // register our interest in hearing about changes to our surface SurfaceHolder holder = getHolder(); holder.addCallback(this); // create thread only; it's started in surfaceCreated() thread = new NMGThread(holder, context); setFocusable(true); // make sure we get key events } /** * Fetches the animation thread corresponding to this LunarView. * * @return the animation thread */ public NMGThread getThread() { return thread; } } 

NMG.java:

 package com.stickfigs.nmg; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Window; import com.stickfigs.nmg.NMGView.NMGThread; public class NMG extends Activity { /** Called when the activity is first created. */ /** A handle to the thread that's actually running the animation. */ private NMGThread nMGThread; /** A handle to the View in which the game is running. */ private NMGView nMGView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Turn off the window's title bar // TODO Turn off the status bar requestWindowFeature(Window.FEATURE_NO_TITLE); // tell system to use the layout defined in our XML file setContentView(R.layout.nmg_layout); // get handles to the LunarView from XML, and its LunarThread nMGView = (NMGView) findViewById(R.id.nmg); nMGThread = nMGView.getThread(); if (savedInstanceState == null) { // we were just launched: set up a new game nMGThread.setState(NMGThread.STATE_READY); Log.w(this.getClass().getName(), "SIS is null"); } else { // we are being restored: resume a previous game nMGThread.restoreState(savedInstanceState); Log.w(this.getClass().getName(), "SIS is nonnull"); } } } 

UPDATE: Aquí está mi R.java y nmg_layout.xml:

R.java: package com.stickfigs.nmg;

 public final class R { public static final class attr { } public static final class drawable { public static final int icon=0x7f020000; } public static final class id { public static final int nmg=0x7f050000; } public static final class layout { public static final int nmg_layout=0x7f030000; } public static final class string { public static final int app_name=0x7f040001; public static final int hello=0x7f040000; } } 

Nmg_layout.xml:

 <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <com.stickfigs.nmg.NMGView android:id="@+id/nmg" android:layout_width="fill_parent" android:layout_height="fill_parent"/> </FrameLayout> 

 nMGView = (NMGView) findViewById(R.id.nmg); nMGThread = nMGView.getThread(); 

 @Override public void onDraw(Canvas canvas) { try { //Drawing Stuff }catch(NullPointerException e){ Log.e("NULL POINTER EXCEPTION","Canvas NULL POINTER"); } } 

  @Override public void surfaceDestroyed(SurfaceHolder arg0) { Log.e("surfaceDestroyed", "SURFACE DESTROYED "); thread.setRunning(false); try { //thread.setRunning(false); thread.join(); } catch (InterruptedException e) { Log.e("Surface Thread Stopped","SURFACE THREAD STOPPED"); } }