android bindService() NullPointerException，androidbindservice

android bindService() NullPointerException，androidbindservice

android app開發中 下面的代碼報錯誤 ,bindService() NullPointerException

 

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publicclass MainActivity extendsActivity implementsOnClickListener{ Button but; Button but2; LocalBinder binder; @Override protectedvoid onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); but = (Button) findViewById(R.id.button1); but.setOnClickListener(this); but = (Button) findViewById(R.id.button2); }  ServiceConnection connection = newServiceConnection(){   @Override publicvoid onServiceConnected(ComponentName arg0, IBinder arg1) { Log.d("D1","connecting"); binder = (LocalBinder) arg1;  }   @Override publicvoid onServiceDisconnected(ComponentName arg0) { Log.d("D1","disconnecting");  }  };  publicstatic class ServiceTest extendsService{   @Override publicIBinder onBind(Intent arg0) { // TODO Auto-generated method stub returnnew LocalBinder(); }  publicclass LocalBinder extendsBinder{ publicvoid toast(){ Toast.makeText(getApplicationContext(),"hope this works", Toast.LENGTH_LONG).show(); } } }   @Override publicvoid onClick(View arg0) { Intent i = newIntent(getApplicationContext(), ServiceTest.LocalBinder.class); bindService(i, connection, Context.BIND_AUTO_CREATE); Toast.makeText(getApplicationContext(),"bind completed", Toast.LENGTH_LONG).show(); }  publicvoid binderMethod(View v){ binder.toast(); }}}

我自己分析了下感覺是 onServiceConnected 沒有執行，所以才會引起null 指標

在but2執行調用 binder.toast() 的時候 會綁定 service 和 activity
當我點擊btn2的時候才拋出這個異常.

為什麼 onServiceConnected 沒有執行？

處理方法

 intent 在調用service的時候並沒有綁定service

1	Intent i = newIntent(getApplicationContext(), ServiceTest.class);

 

原文地址：http://www.itmmd.com/201411/95.html 
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