Android：线程无法运行：/

Question

我一直在youtube上跟随一个关于surfaceview的教程。

我抄正是代码显示在本教程中，但是当我运行它，它崩溃时，它应该工作.. 这里是面类在我的代码：

它说nullpointerexpection在简历（）;

public class dfgfActivity extends Activity implements OnTouchListener 
{ 
    OurView v; 
    protected void OnCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    v = new OurView(this); 
    v.setOnTouchListener(this); 
    setContentView(v); 

} 




@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
    v.pause(); 
} 




@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    v.resume(); 
} 




public class OurView extends SurfaceView implements Runnable 
{ 
    Thread t=null; 
    SurfaceHolder holder; 
    boolean isItOK=false; 

    public OurView(Context context) { 
     super(context); 
     // TODO Auto-generated constructor stub 
     holder = getHolder(); 
    } 

    public void run() { 
     // TODO Auto-generated method stub 
     while (isItOK) { 
      if (!holder.getSurface().isValid()) { 
       continue; 
      } 

      Canvas c = holder.lockCanvas(); 
      c.drawARGB(255, 255, 10, 200); 
      holder.unlockCanvasAndPost(c); 
     } 

    } 

    public void pause() { 
     isItOK = false; 
     while (true) { 
      try { 
       t.join(); 
      } 
      catch (InterruptedException e) { 
       e.printStackTrace();  
      } 
      break; 
     } 
     t = null; 
    } 

    public void resume() { 
     isItOK = true; 
     t = new Thread(this); 
     t.start(); 

    } 

} 




public boolean onTouch(View v, MotionEvent event) { 
    // TODO Auto-generated method stub 
    return false; 
} 

} 

---

07-02 18:55:48.585: D/AndroidRuntime(684): Shutting down VM 
07-02 18:55:48.595: W/dalvikvm(684): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 
07-02 18:55:48.595: E/AndroidRuntime(684): Uncaught handler: thread main exiting due to uncaught exception 
07-02 18:55:48.665: E/AndroidRuntime(684): java.lang.RuntimeException: Unable to resume activity {fdgfd.dfgfdg/fdgfd.dfgfdg.dfgfActivity}: java.lang.NullPointerException 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2950) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2965) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2516) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.os.Looper.loop(Looper.java:123) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread.main(ActivityThread.java:4363) 
07-02 18:55:48.665: E/AndroidRuntime(684): at java.lang.reflect.Method.invokeNative(Native Method) 
07-02 18:55:48.665: E/AndroidRuntime(684): at java.lang.reflect.Method.invoke(Method.java:521) 
07-02 18:55:48.665: E/AndroidRuntime(684): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
07-02 18:55:48.665: E/AndroidRuntime(684): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
07-02 18:55:48.665: E/AndroidRuntime(684): at dalvik.system.NativeStart.main(Native Method) 
07-02 18:55:48.665: E/AndroidRuntime(684): Caused by: java.lang.NullPointerException 
07-02 18:55:48.665: E/AndroidRuntime(684): at fdgfd.dfgfdg.dfgfActivity.onResume(dfgfActivity.java:42) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.Activity.performResume(Activity.java:3763) 
07-02 18:55:48.665: E/AndroidRuntime(684): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2937) 
07-02 18:55:48.665: E/AndroidRuntime(684): ... 12 more 
07-02 18:55:48.716: I/dalvikvm(684): threadid=7: reacting to signal 3 
07-02 18:55:48.716: E/dalvikvm(684): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 

Answer 1

在你的方法onCreate()的方法是使用资金的情况下写的：OnCreate()。尝试将其更改为小型案例。