如何解決Android上的NullPointerException？

我的程序在我的Android模擬器立即崩潰，我收到這在Eclipse控制檯：如何解決Android上的NullPointerException？

java.lang.NullPointerException 
    at com.android.ddmlib.Client.sendAndConsume(Client.java:572) 
    at com.android.ddmlib.HandleHello.sendHELO(HandleHello.java:142) 
    at com.android.ddmlib.HandleHello.sendHelloCommands(HandleHello.java:65) 
    at com.android.ddmlib.Client.getJdwpPacket(Client.java:671) 
    at com.android.ddmlib.MonitorThread.processClientActivity(MonitorThread.java:317) 
    at com.android.ddmlib.MonitorThread.run(MonitorThread.java:263)

我怎麼能解決什麼是引發此消息？我是Eclipse和Android的新手。

，當我嘗試推出一個按鈕，對話框的程序完全崩潰，並回到這裏指的是：

@Override 
    protected Dialog onCreateDialog(int id) { 
     Dialog dialog; 
     switch (id) { 
     case TIME_DIALOG_ID: 
      return new TimePickerDialog(this, 
        mTimeSetListener, mHour24, mMinute, false); 


     case POWER_OFF_OPTIONS: 
      AlertDialog.Builder builder; 
      AlertDialog alertDialog; 

      Context mContext = getApplicationContext(); 
      LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE); 
      View layout = inflater.inflate(R.layout.options, 
        (ViewGroup)findViewById(R.id.relativeLayout1)); 
      //Capture view elements 
      mChkAudio = (CheckBox) findViewById(R.id.chkAudio); 
      mChkBluetooth = (CheckBox) findViewById(R.id.chkBlueTooth); 
      mChkNetwork = (CheckBox) findViewById(R.id.chkNetwork); 
      mChkWifi = (CheckBox) findViewById(R.id.chkWifi); 
      mBtnOK = (Button) findViewById(R.id.btnOK); 
      mBtnOK.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View v) { 
        DismissPowerOptions(); 
        } 
      }); 
      builder = new AlertDialog.Builder(mContext); 
      builder.setView(layout); 
      alertDialog = builder.create(); 
      //return alertDialog; 
     default: 
      dialog = null; 
     } 
     return dialog; 
    }

來源

2011-04-13 Andrew

任何事情之前你HandleHello Activity類檢查線142。 – papachan 2011-04-13 17:21:02

我希望看到關於**如何在Android中解決**問題的答案。我不做Android開發 - 但是有什麼工具（例如調試器或靜態分析器或方法論）可用於在Android平臺上以可重複的方式找出哪些問題？ – 2011-04-13 17:36:59

我有一個警告，但沒有錯誤：靜態字段AudioManager.STREAM_SYSTEM應該以靜態方式訪問 – Andrew 2011-04-13 19:13:46