Android服务连接?

时间:2010-12-16 00:28:46

标签: android service android-activity bind connect

当我的活动开始时,它会创建一个充当服务器的服务。服务器从我桌面上的python脚本接收原始数据。该服务创建并维护DataManagers,它在一个键入DM名称的哈希映射中处理来自我的python脚本的所有数据。在任何给定的时间,我都需要一个活动来绑定服务请求来自服务和进程的一些数据,当活动暂停,停止或被销毁时它将解除绑定。

我相信我的绑定是正确的,但是当我启动服务时,传递的ServiceConnection始终返回null。任何想法都在发生什么?我的代码是直接从Android的RemoteService类中窃取的 谢谢 〜Aedon

{Code addendum}

绑定到PublicService的HomeScreen活动

@Override public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    doBindService();
    setContentView(R.layout.homescreen);
    initView();
}

public void initView() {
    workbenchs = (Gallery)findViewById(R.id.workbenchs);
    workbenchs.setMinimumHeight(h/4);
    workbenchs.setAdapter(new WorkBenchAdapter(this));
    workbenchs.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
            Intent it = new Intent(HomeScreen.this, Controller.class);
            it.putExtra("workbench", arg2);
            startActivity(it);
        }
    });
}

 // Gallery Adapter

public class WorkBenchAdapter extends BaseAdapter {
    public WorkBenchAdapter(Context c) {   }
    public int getCount() {return mBoundService.getNumBenchs();}
    public Object getItem(int position) {return position;}
    public long getItemId(int position) {return position;}

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView i = new ImageView(HomeScreen.this);
    i.setImageBitmap(mBoundService.getWorkbench(position).toBitmap());
        i.setLayoutParams(new Gallery.LayoutParams(w/4, h/4));
        return i;
    }
}


 // Service Necessities

public boolean mIsBound = false;
private PublicService mBoundService;
private ServiceConnection mConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName className, IBinder service) {
        mBoundService = ((PublicService.LocalBinder)service).getService();
    }

    public void onServiceDisconnected(ComponentName className) {
        mBoundService = null;
    }
};

void doBindService() {
    Log.d(TAG, "Binding...");
    bindService(new Intent(this, PublicService.class), mConnection, Context.BIND_AUTO_CREATE);
    mIsBound = true;
    Log.d(TAG, "Bound.");
}

void doUnbindService() {
    if (mIsBound) {
        Log.d(TAG, "Unbinding...");
        unbindService(mConnection);
        mIsBound = false;
        Log.d(TAG, "Unbound."); 
    }
}

我的问题来自Workbench适配器。创建适配器时,它调用get count(从0开始),但它一直说mBoundService为null。我已经尝试在绑定之前启动服务,并且没有任何改变......

1 个答案:

答案 0 :(得分:2)

您是否在清单中指定了服务标签?

<application>中,您需要像<service android:name="namespace.ServiceName"/>

一样指定服务