Android bindService () NullPointerException, androidbindservice

Android bindService () NullPointerException, androidbindservice

The following code in android app development reports an error: 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(); }}}

I analyzed it myself and thought that onServiceConnected was not executed, so it would cause a null pointer.

When but2 calls binder. toast (), it binds the service and activity.
This exception is thrown when I click btn2.

Why is onServiceConnected not executed?

Solution

Intent did not bind a service when calling the service.

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

 

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