How to test AsyncTask triggered by a click?

问题

If the AsyncTask is triggered by a click event on a button, how can I test it - how can I wait until the AsyncTask completes?

Note I can always execute the AsyncTask directly in my test method, I know how to test such scenario. However, if I insist on on using simulating the onClick event using performClick() can I still test my registration process?

MainActivityFunctionalTest

public class MainActivityFunctionalTest extends
            ActivityInstrumentationTestCase2<MainActivity> {
    // ...
        public void testRegistration() {
        ImageButton submitBtn = (ImageButton) solo.getView(R.id.BtnR);
        assertNotNull(submitBtn);


        submitBtn.performClick();
                // How to do something when the registration is done?
        }
    // ...
    }

MainActivity (of the project to be tested)

ImageButton submitBtn = (ImageButton) findViewById(R.id.BtnRegister);
submitBtn.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                sendRegistration();
            }
        });

public void sendRegistration() {
        Processor processor = new Processor();// subclass of AsyncTask
        processor.execute();
    }

回答1:

you can do :

myAsyn obj = new myAsyn();
obj.execute();

while(obj.getStatus()==AsynTask.status.Finished)
{
//wait here
}

//when it finishes , this code will going to execute.

回答2:

you can also use get() method to wait until task complete. http://developer.android.com/reference/android/os/AsyncTask.html#get%28%29

回答3:

Use your Activity from your ActivityTestCase. Find the view by id and simply send the event to your view.

More info on runTestOnUiThread:

private void buttonTest(Activity activity, int buttonId){
   Button button = (Button) activity.findViewById(buttonId);
    assertNotNull("Button not allowed to be null", button);
    button.performClick();
}

private void runButtonTest(Activity activity, int buttonId){
       getInstrumentation().runTestOnUiThread(new Runnable() {
            public void run() {
                buttonTest(activity,buttonId);
            }
     Object o = activity.mAsyncTask.get();
     assertNotNull(o);
}

Alternatively you can wait until Status of the AsyncTask changes to Status.Finished.