Espresso ViewAction for Spoon Screenshot

SpoonScreenshotAction.java

import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.support.test.espresso.UiController;
import android.support.test.espresso.ViewAction;
import android.view.View;
import com.squareup.spoon.Spoon;
import org.hamcrest.Matcher;
import org.hamcrest.Matchers;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.matcher.ViewMatchers.isRoot;

public final class SpoonScreenshotAction implements ViewAction {
  private final String tag;
  private final String testClass;
  private final String testMethod;

  public SpoonScreenshotAction(String tag, String testClass, String testMethod) {
    this.tag = tag;
    this.testClass = testClass;
    this.testMethod = testMethod;
  }

  @Override public Matcher<View> getConstraints() {
    return Matchers.anything();
  }

  @Override public String getDescription() {
    return "Taking a screenshot using spoon.";
  }

  @Override public void perform(UiController uiController, View view) {
    Spoon.screenshot(getActivity(view), tag, testClass, testMethod);
  }

  private static Activity getActivity(View view) {
    Context context = view.getContext();
    while (!(context instanceof Activity)) {
      if (context instanceof ContextWrapper) {
        context = ((ContextWrapper) context).getBaseContext();
      } else {
        throw new IllegalStateException("Got a context of class "
            + context.getClass()
            + " and I don't know how to get the Activity from it");
      }
    }
    return (Activity) context;
  }

  /** This must be called directly from your test method. */
  public static void perform(String tag) {
    StackTraceElement[] trace = Thread.currentThread().getStackTrace();
    String testClass = trace[3].getClassName();
    String testMethod = trace[3].getMethodName();
    onView(isRoot()).perform(new SpoonScreenshotAction(tag, testClass, testMethod));
  }
}

If you want to take a screenshot from a test method, you can use the convenience SpoonScreenshotAction.perform("my_screen"). If you're calling from a helper method, you'll have to adjust the stacktrace wizardry or just manually create a SpoonScreenshotAction with the class/method names populated, and then pass that into the normal espresso perform method.

I ran into issues with the getConstraints() method returning an Object of type Matcher I ended up returning a new IsAnything(); object in it's place. Not sure if its the best solution but I figured Id leave it here if someone needs it. I found the solution in the SO link below.

http://stackoverflow.com/questions/33255294/error-when-use-anything-in-android-testing-incompatible-types-required-match

In Android 7+ the getActivity(view) code fails because view.getContext() does not have access to the enclosing activity anymore.

Instead, the code below works in Android 7+ and 6:

private static Activity getActivity(final View view) {
    return (Activity) view.findViewById(android.R.id.content).getContext();
}