android.support.test.espresso.UiController#loopMainThreadUntilIdle ( )源码实例Demo

public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    (new ScrollToPositionViewAction(this.position)).perform(uiController, view);
    uiController.loopMainThreadUntilIdle();

    View targetView = recyclerView.getChildAt(this.position).findViewById(this.viewId);

    if (targetView == null) {
        throw (new PerformException.Builder()).withActionDescription(this.toString())
                .withViewDescription(

                        HumanReadables.describe(view))
                .withCause(new IllegalStateException(
                        "No view with id "
                                + this.viewId
                                + " found at position: "
                                + this.position))
                .build();
    } else {
        this.viewAction.perform(uiController, targetView);
    }
}
 

private static ViewAction showControls() {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return isAssignableFrom(MovieView.class);
        }

        @Override
        public String getDescription() {
            return "Show controls of MovieView";
        }

        @Override
        public void perform(UiController uiController, View view) {
            uiController.loopMainThreadUntilIdle();
            ((MovieView) view).showControls();
            uiController.loopMainThreadUntilIdle();
        }
    };
}
 

private static ViewAction showControls() {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return isAssignableFrom(MovieView.class);
        }

        @Override
        public String getDescription() {
            return "Show controls of MovieView";
        }

        @Override
        public void perform(UiController uiController, View view) {
            uiController.loopMainThreadUntilIdle();
            ((MovieView) view).showControls();
            uiController.loopMainThreadUntilIdle();
        }
    };
}
 

public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    (new ScrollToPositionViewAction(this.position)).perform(uiController, view);
    uiController.loopMainThreadUntilIdle();

    View targetView = recyclerView.getChildAt(this.position).findViewById(this.viewId);

    if (targetView == null) {
        throw (new PerformException.Builder()).withActionDescription(this.toString())
                .withViewDescription(

                        HumanReadables.describe(view))
                .withCause(new IllegalStateException(
                        "No view with id "
                                + this.viewId
                                + " found at position: "
                                + this.position))
                .build();
    } else {
        this.viewAction.perform(uiController, targetView);
    }
}
 

public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    (new ScrollToPositionViewAction(this.position)).perform(uiController, view);
    uiController.loopMainThreadUntilIdle();

    View targetView = recyclerView.getChildAt(this.position).findViewById(this.viewId);

    if (targetView == null) {
        throw (new PerformException.Builder()).withActionDescription(this.toString())
                                              .withViewDescription(

                                                  HumanReadables.describe(view))
                                              .withCause(new IllegalStateException(
                                                  "No view with id "
                                                      + this.viewId
                                                      + " found at position: "
                                                      + this.position))
                                              .build();
    } else {
        this.viewAction.perform(uiController, targetView);
    }
}
 

/**
 * Perform action of waiting for a specific time. Useful when you need
 * to wait for animations to end and Espresso fails at waiting.
 * <p/>
 * E.g.:
 * onView(isRoot()).perform(waitAtLeast(Sampling.SECONDS_15));
 *
 * @param millis
 * @return
 */
public static ViewAction waitAtLeast(final long millis) {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return anything();
        }

        @Override
        public String getDescription() {
            return "wait for at least " + millis + " millis.";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
            uiController.loopMainThreadForAtLeast(millis);
        }
    };
}
 

/**
 * Perform action of waiting until UI thread is free.
 * <p/>
 * E.g.:
 * onView(isRoot()).perform(waitUntilIdle());
 *
 * @return
 */
public static ViewAction waitUntilIdle() {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return anything();
        }

        @Override
        public String getDescription() {
            return "wait until UI thread is free";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
        }
    };
}
 

/**
 * Perform action of waiting for a specific time. Useful when you need
 * to wait for animations to end and Espresso fails at waiting.
 * <p/>
 * E.g.:
 * onView(isRoot()).perform(waitAtLeast(Sampling.SECONDS_15));
 *
 * @param millis
 * @return
 */
public static ViewAction waitAtLeast(final long millis) {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return anything();
        }

        @Override
        public String getDescription() {
            return "wait for at least " + millis + " millis.";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
            uiController.loopMainThreadForAtLeast(millis);
        }
    };
}
 

/**
 * Perform action of waiting until UI thread is free.
 * <p/>
 * E.g.:
 * onView(isRoot()).perform(waitUntilIdle());
 *
 * @return
 */
public static ViewAction waitUntilIdle() {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return anything();
        }

        @Override
        public String getDescription() {
            return "wait until UI thread is free";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
        }
    };
}
 

@Override
public final void perform(UiController uiController, View view) {
    uiController.loopMainThreadUntilIdle();

    long finishTime = System.currentTimeMillis() + duration;
    while (System.currentTimeMillis() < finishTime) {
        if (isConditionMet(view)) {
            return;
        }
        uiController.loopMainThreadForAtLeast(50L);
    }

    throw new PerformException.Builder()
            .withActionDescription(this.getDescription())
            .withViewDescription(HumanReadables.describe(view))
            .withCause(new TimeoutException())
            .build();
}
 

@Override
public void perform(UiController uiController, View view) {
  uiController.loopMainThreadUntilIdle();
  Activity activity = getActivity(view.getContext());
  if (activity == null && view instanceof ViewGroup) {
    ViewGroup viewGroup = (ViewGroup) view;
    int childCount = viewGroup.getChildCount();
    for (int i = 0; i < childCount && activity == null; ++i) {
      activity = getActivity(viewGroup.getChildAt(i).getContext());
    }
  }
  activity.setRequestedOrientation(orientation);
}
 

@Override
public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    int itemCount = recyclerView.getAdapter().getItemCount();
    try {
        recyclerView.scrollToPosition(itemCount - 1);
        uiController.loopMainThreadUntilIdle();
    } catch (RuntimeException e) {
        throw new PerformException.Builder().withActionDescription(this.getDescription())
                .withViewDescription(HumanReadables.describe(view)).withCause(e).build();
    }
}
 

@Override
public final void perform(UiController uiController, View view) {
    final StepperLayout stepperLayout = (StepperLayout) view;
    final ViewPager viewPager = (ViewPager) stepperLayout.findViewById(com.stepstone.stepper.R.id.ms_stepPager);
    // Add a custom tracker listener
    final CustomViewPagerListener customListener = new CustomViewPagerListener();
    viewPager.addOnPageChangeListener(customListener);

    // Note that we're running the following block in a try-finally construct. This
    // is needed since some of the actions are going to throw (expected) exceptions. If that
    // happens, we still need to clean up after ourselves to leave the system (Espresso) in a good
    // state.
    try {
        // Register our listener as idling resource so that Espresso waits until the
        // wrapped action results in the view pager getting to the STATE_IDLE state
        Espresso.registerIdlingResources(customListener);

        uiController.loopMainThreadUntilIdle();

        performAction(stepperLayout);

        uiController.loopMainThreadUntilIdle();

        customListener.mNeedsIdle = true;
        uiController.loopMainThreadUntilIdle();
        customListener.mNeedsIdle = false;
    } finally {
        // Unregister our idling resource
        Espresso.unregisterIdlingResources(customListener);
        // And remove our tracker listener from ViewPager
        viewPager.removeOnPageChangeListener(customListener);
    }
}
 

public static ViewAction waitId(final int viewId, final long millis) {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return isRoot();
        }

        @Override
        public String getDescription() {
            return "wait for a specific view with id <" + viewId + "> during " + millis + " millis.";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
            final long startTime = System.currentTimeMillis();
            final long endTime = startTime + millis;
            final Matcher<View> viewMatcher = withId(viewId);

            do {
                for (View child : TreeIterables.breadthFirstViewTraversal(view)) {
                    // found view with required ID
                    if (viewMatcher.matches(child)) {
                        return;
                    }
                }

                uiController.loopMainThreadForAtLeast(50);
            }
            while (System.currentTimeMillis() < endTime);

            // timeout happens
            throw new PerformException.Builder()
                    .withActionDescription(this.getDescription())
                    .withViewDescription(HumanReadables.describe(view))
                    .withCause(new TimeoutException())
                    .build();
        }
    };
}
 

public static ViewAction nestedScrollTo() {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return allOf(isDescendantOfA(isAssignableFrom(NestedScrollView.class)), withEffectiveVisibility(
                ViewMatchers.Visibility.VISIBLE));
        }

        @Override
        public String getDescription() {
            return "Scrolling to view inside NestedScrollView";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            try {
                final NestedScrollView nestedScrollView = (NestedScrollView)
                    findFirstParentLayoutOfClass(view, NestedScrollView.class);
                if (nestedScrollView != null) {
                    final CoordinatorLayout coordinatorLayout =
                        (CoordinatorLayout) findFirstParentLayoutOfClass(view, CoordinatorLayout.class);
                    if (coordinatorLayout != null) {
                        final CollapsingToolbarLayout collapsingToolbarLayout =
                            findCollapsingToolbarLayoutChildIn(coordinatorLayout);
                        if (collapsingToolbarLayout != null) {
                            final int toolbarHeight = collapsingToolbarLayout.getHeight();
                            nestedScrollView.startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
                            nestedScrollView.dispatchNestedPreScroll(0, toolbarHeight, null, null);
                        }
                    }
                    nestedScrollView.scrollTo(0, view.getTop());
                } else {
                    throw new Exception("Unable to find NestedScrollView parent.");
                }
            } catch (final Exception e) {
                throw new PerformException.Builder()
                    .withActionDescription(this.getDescription())
                    .withViewDescription(HumanReadables.describe(view))
                    .withCause(e)
                    .build();
            }
            uiController.loopMainThreadUntilIdle();
        }
    };
}
 

@Override
public void perform(UiController uiController, View view) {
    uiController.loopMainThreadUntilIdle();
    final Activity activity = (Activity) view.getContext();
    activity.setRequestedOrientation(orientation);
}
 

/**
 * Perform action of waiting for a specific view id.
 * <p/>
 * E.g.:
 * onView(isRoot()).perform(waitId(R.id.dialogEditor, Sampling.SECONDS_15));
 *
 * @param viewId
 * @param millis
 * @return
 */
public static ViewAction waitId(final int viewId, final long millis) {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return isRoot();
        }

        @Override
        public String getDescription() {
            return "wait for a specific view with id <" + viewId + "> during " + millis + " millis.";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
            final long startTime = System.currentTimeMillis();
            final long endTime = startTime + millis;
            final Matcher<View> viewMatcher = withId(viewId);

            do {
                for (View child : TreeIterables.breadthFirstViewTraversal(view)) {
                    // found view with required ID
                    if (viewMatcher.matches(child)) {
                        return;
                    }
                }

                uiController.loopMainThreadForAtLeast(50);
            }
            while (System.currentTimeMillis() < endTime);

            // timeout happens
            throw new PerformException.Builder()
                    .withActionDescription(this.getDescription())
                    .withViewDescription(HumanReadables.describe(view))
                    .withCause(new TimeoutException())
                    .build();
        }
    };
}
 

/**
 * Perform action of waiting for a specific view id.
 * <p/>
 * E.g.:
 * onView(isRoot()).perform(waitId(R.id.dialogEditor, Sampling.SECONDS_15));
 *
 * @param viewId
 * @param millis
 * @return
 */
public static ViewAction waitId(final int viewId, final long millis) {
    return new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return isRoot();
        }

        @Override
        public String getDescription() {
            return "wait for a specific view with id <" + viewId + "> during " + millis + " millis.";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            uiController.loopMainThreadUntilIdle();
            final long startTime = System.currentTimeMillis();
            final long endTime = startTime + millis;
            final Matcher<View> viewMatcher = withId(viewId);

            do {
                for (View child : TreeIterables.breadthFirstViewTraversal(view)) {
                    // found view with required ID
                    if (viewMatcher.matches(child)) {
                        return;
                    }
                }

                uiController.loopMainThreadForAtLeast(50);
            }
            while (System.currentTimeMillis() < endTime);

            // timeout happens
            throw new PerformException.Builder()
                .withActionDescription(this.getDescription())
                .withViewDescription(HumanReadables.describe(view))
                .withCause(new TimeoutException())
                .build();
        }
    };
}