android bindService() NullPointerException

android app开发中 下面的代码报错误 ,bindService() NullPointerException

 

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public class MainActivity extends Activity implements OnClickListener{   Button but;   Button but2;   LocalBinder binder;   @Override   protected void 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 = new ServiceConnection(){       @Override   public void onServiceConnected(ComponentName arg0, IBinder arg1) {   Log.d( "D1" , "connecting" );   binder = (LocalBinder) arg1;     }       @Override   public void onServiceDisconnected(ComponentName arg0) {   Log.d( "D1" , "disconnecting" );     }     };     public static class ServiceTest extends Service{       @Override   public IBinder onBind(Intent arg0) {   // TODO Auto-generated method stub   return new LocalBinder();   }     public class LocalBinder extends Binder{   public void toast(){   Toast.makeText(getApplicationContext(), "hope this works" , Toast.LENGTH_LONG).show();   }   }   }       @Override   public void onClick(View arg0) {   Intent i = new Intent(getApplicationContext(), ServiceTest.LocalBinder. class );   bindService(i, connection, Context.BIND_AUTO_CREATE);   Toast.makeText(getApplicationContext(), "bind completed" , Toast.LENGTH_LONG).show();   }     public void binderMethod(View v){   binder.toast();   } } }

我自己分析了下感觉是 onServiceConnected 没有执行，所以才会引起空指针

在but2执行调用 binder.toast() 的时候 会绑定 service 和 activity
当我点击btn2的时候才抛出这个异常.

为什么 onServiceConnected 没有执行？

处理方法

 intent 在调用service的时候并没有绑定service

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

 

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