joecks joecks - 20 days ago 5
Android Question

How to regain Access on a Activity after sending it to background

With Espresso I try to test sending an Activity to background, with the Home button and then getting it up in the foreground again to make some checks:

@EspressoTest
public void test() {
onSomeView().check(matches(isDisplayed()));
getInstrumentation().sendKeyDownUpSync(KeyEvent.KEYCODE_HOME);

Context context = getInstrumentation().getTargetContext();
Intent intent = new Intent(context, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);

onSomeView().check(matches(isDisplayed()));
}


I had to use
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
which was suggested by an exception, but apart of that I also tested, starting it as the Launcher Activity, or using
FLAG_ACTIVITY_REORDER_TO_FRONT
, but the view is not visible. Even though the test passes.

Answer

Ok I figured it out. First it is necessary to use the Activity Context provided by getActivity, and then I could use intents to send the activity in background and in foreground, using the HOME category and the FLAG_ACTIVITY_REORDER_TO_FRONT:

private void goHome(Activity activity) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_HOME);
    activity.startActivity(intent);
}

private void bringToForeground(Activity activity) {
    Intent intent = new Intent(activity, MainActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    activity.startActivity(intent);
}

@EspressoTest
public void test() {
    //do some ui stuff to ensure the activity is up and running
    goHome(getActivity());
    // eventually sleep, or implement an idling resource
    bringToForeground(getActivity());
    // do some ui tests
}
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