如何在AsyncTask android中运行绑定服务方法

Question

Hi i've got a problem I want to use a Running service method in my AsyncTask.

public class SplashActivity extends Activity {

    boolean bBindedBluetooth;
    static BTService Bluetooth;

    ...

    @Override
    protected void onStart() {
      super.onStart();  
      new ActivityStarter().execute("");};@Override
    protected void onStop() { super.onStop(); unbindMyService("onStop"); };  
    @Override
    protected void onPause(){ super.onPause(); unbindMyService("onPause"); };
    @Override
    protected void onDestroy() { super.onDestroy(); unbindMyService("onDestroy"); }; 


    ...

    private class ActivityStarter extends AsyncTask<String,Void,String>{
        @Override
        protected String doInBackground(String... params) {
            try{
                Intent btIntent = new Intent(SplashActivity.this, BTService.class);
                bindService(btIntent, scConnection, Context.BIND_AUTO_CREATE);
                //Bluetooth.initService();
                //Bluetooth.StartBluetoothConnection(); 

            } catch (Exception e){
                Log.e(this.getClass().getSimpleName(), e.getMessage());
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            Intent MainActivityIntent = new Intent(SplashActivity.this, MainActivity.class);
            SplashActivity.this.startActivity(MainActivityIntent);
            SplashActivity.this.finish();
        }

    }           


    private void unbindMyService(String methodNameForLog){
        try{
              if(bBindedBluetooth){
                  unbindService(scConnection);
                  bBindedBluetooth = false;
              }
          }catch(Exception e){
              Log.e( this.getClass().getSimpleName(), methodNameForLog + " " + e.getMessage() );
          }
    }

    ServiceConnection scConnection = new ServiceConnection() {

          public void onServiceDisconnected(ComponentName name) {
           bBindedBluetooth = false;
           Bluetooth = null;
          }

          public void onServiceConnected(ComponentName cnName, IBinder ibService) {
           bBindedBluetooth = true;
           LocalBinder mLocalBinder = (LocalBinder)ibService;
           Bluetooth = mLocalBinder.getServerInstance();

          }
    };   
}

And the problem goes here i don't have any idea how to fix this.

//Bluetooth.initService();
//Bluetooth.StartBluetoothConnection();

1. Run BluetoothService - works
2. bind BluetoothService - works
3. Run AsyncTask which must connect me to BluetoothDevice.
4. After 1-3 run MainActivity. - works

ad3. When i try to run Bluetooth.initService LOGCAT show me a:

An error occured while executing doInBackground();

in initService() i don't have a code (it is only for a test)

Please help.

Answer 1

You have to move your use of the Bluetooth object into onServiceConnected() because that's when the service is actually bound, which may or may not happen immediately after your call to bindService()

You could also bind to the service outside the AsyncTask in onStart() and start the AsyncTask from onServiceConnected()

Binding to the service uses a callback anyway and shouldn't be heavy on the UI thread.