ViewUtils.java

package com.mercandalli.android.apps.files.view;

import android.content.Context;
import android.support.test.espresso.UiController;
import android.support.test.espresso.ViewAction;
import android.view.View;

import org.hamcrest.Matcher;

public class ViewUtils {

    /**
     * {@link android.support.v4.view.ViewPager} constraints.
     * <p>
     * http://stackoverflow.com/questions/33505953/espresso-how-to-test-swiperefreshlayout
     */
    public static ViewAction withCustomConstraints(final ViewAction action, final Matcher<View> constraints) {
        return new ViewAction() {
            @Override
            public Matcher<View> getConstraints() {
                return constraints;
            }

            @Override
            public String getDescription() {
                return action.getDescription();
            }

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

    private static float dpToPx(final Context context, final float dp) {
        return dp * context.getResources().getDisplayMetrics().density;
    }
}