Android putExtra（“roomTitle”、“Title”）； //意图。额外（“房间状态”、“副标题”）； } @试验 public void postsRecycleViewHomeAdapter（）{ //设置虚拟数据 List roomProduct

putExtra（“roomTitle”、“Title”）； //意图。额外（“房间状态”、“副标题”）； } @试验 public void postsRecycleViewHomeAdapter（）{ //设置虚拟数据 List roomProductList=Arrays.asList( 新的RoomProduct（0，右拉深，ic_启动器_背景，“点击”，“打开”，05f）， 新的RoomProduct（1，R.drawable.ic_发射器_背景，“淋浴”，“运行”，0.5f）， 新RoomProduct（2，R.drawable.ic_launcher_背景，“电视频道”，“53”，0.5f） ); RoomAdapter=新的RoomAdapter（上下文，roomProductList）； RecyclerView rvParent=新的RecyclerView（上下文）； rvParent.setLayoutManager（新的LinearLayoutManager（上下文））； //对onBindViewHolder和虚拟数据上的ViewHolder运行测试 RoomAdapter.ItemViewAdapterHolder viewHolder=adapter.onCreateViewHolder（rvParent，0）； //测试1 adapter.onBindViewHolder（viewHolder，0）； assertEquals（“点击”，viewHolder.roomItem.getText（））； assertEquals（“On”，viewHolder.roomState.getText（））； ShadowDrawable ShadowDrawable=Shadows.shadowOf（viewHolder.roomImageItem.getDrawable（））； assertEquals（R.drawable.ic_launcher_background，shadowDrawable.getCreatedFromResId（））； //测试2 适配器。onBindViewHolder（viewHolder，1）； assertEquals（“Shower”，viewHolder.roomItem.getText（））； assertEquals（“Running”，viewHolder.roomState.getText（））； ShadowDrawable ShadowDrawable 1=Shadows.shadowOf（viewHolder.roomImageItem.getDrawable（））； assertEquals（R.drawable.ic_launcher_background，shadowDrawable1.getCreatedFromResId（））； //测试3 适配器。onBindViewHolder（viewHolder，2）； assertEquals（“电视频道”，viewHolder.roomItem.getText（））； assertEquals（“53”，viewHolder.roomState.getText（））； ShadowDrawable ShadowDrawable 2=Shadows.shadowOf（viewHolder.roomImageItem.getDrawable（））； assertEquals（R.drawable.ic_launcher_background，shadowDrawable2.getCreatedFromResId（））； } }

---

RuntimeEnvironment.application已弃用。另一种解决方案是使用Kotlin语法的context=ApplicationProvider.getApplicationContext（）

public class HomeAdapter extends RecyclerView.Adapter <HomeAdapter.ProductViewHolder> {

   private Context mCtx;

   private List <HomeProduct> homeProductList;

   public HomeAdapter(Context context, List <HomeProduct> homeProductList) {
    this.mCtx = context;
    this.homeProductList = homeProductList;
}

@Override
public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    View view = inflater.inflate(R.layout.home_item_layout, null);
    return new ProductViewHolder(view);
}

@Override
public void onBindViewHolder(final ProductViewHolder holder, final int position) {

    final HomeProduct product = homeProductList.get(position);
    final String title = product.getTitle();
    final String subtitle = product.getSubtitle();

    holder.homeImageView.setImageDrawable(ContextCompat.getDrawable(mCtx, product.getImage()));
    holder.homeTitleTextView.setText(product.getTitle());
    holder.homeSubtitleTextView.setText(product.getSubtitle());

    holder.homeLinearlayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intentRoomActivity = new Intent(mCtx, RoomActivity.class);
            intentRoomActivity.putExtra("room_title", title);
            intentRoomActivity.putExtra("room_state", subtitle);
            mCtx.startActivity(intentRoomActivity);
        }
    });
}

@Override
public int getItemCount() {
    return homeProductList.size();
}

class ProductViewHolder extends RecyclerView.ViewHolder {
    TextView homeTitleTextView, homeSubtitleTextView;
    ImageView homeImageView;
    LinearLayout homeLinearlayout;

    public ProductViewHolder(View itemView) {
        super(itemView);

        homeTitleTextView = itemView.findViewById(R.id.home_title_textView);
        homeSubtitleTextView = itemView.findViewById(R.id.home_subtitle_textView);
        homeImageView = itemView.findViewById(R.id.home_imageView);
        homeLinearlayout = itemView.findViewById(R.id.homeLinearLayout);
    }

}

package com.codepath.testingdemo.adapters;

    import android.content.Context;
    import android.os.Build;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.view.View;

    import com.codepath.testingdemo.BuildConfig;
    import com.codepath.testingdemo.models.Post;

    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.robolectric.RobolectricGradleTestRunner;
    import org.robolectric.RuntimeEnvironment;
    import org.robolectric.annotation.Config;

    import java.util.Arrays;
    import java.util.List;

    import static org.assertj.android.api.Assertions.assertThat;
    import static org.assertj.android.recyclerview.v7.api.Assertions.assertThat;
    import static org.junit.Assert.assertEquals;


    @Config(constants = BuildConfig.class, sdk = Build.VERSION_CODES.LOLLIPOP)
    @RunWith(RobolectricGradleTestRunner.class)
    public class PostsAdapterTest {

        private Context context;

        @Before
        public void setup() {
            context = RuntimeEnvironment.application;
        }

        @Test
        public void postsAdapterViewRecyclingCaption() {
            // Set up input
            List<Post> posts = Arrays.asList(
                    new Post("Lebron", null),
                    new Post("Steph", "We Won!!!")
            );


            PostsRecyclerViewAdapter adapter = new PostsRecyclerViewAdapter(posts);

            RecyclerView rvParent = new RecyclerView(context);
            rvParent.setLayoutManager(new LinearLayoutManager(context));

            // Run test
            PostsRecyclerViewAdapter.PostItemViewHolder viewHolder =
                    adapter.onCreateViewHolder(rvParent, 0);

            adapter.onBindViewHolder(viewHolder, 0);

            // JUnit Assertion
            assertEquals(View.GONE, viewHolder.tvCaption.getVisibility());

            // AssertJ-Android Assertion
            assertThat(viewHolder.tvCaption).isGone();

            adapter.onBindViewHolder(viewHolder, 1);

            // JUnit Assertion
            assertEquals("Steph: We Won!!!", viewHolder.tvCaption.getText().toString());

            // AssertJ-Android Assertion
            assertThat(viewHolder.tvCaption).isVisible().containsText("Won");

            assertThat(adapter).hasItemCount(2);
        }
    }

import static junit.framework.Assert.assertEquals;


@RunWith(RobolectricTestRunner.class)
@Config(constants = BuildConfig.class)

public class RoomAdapterTest {
    private Context context;

    @Before
    public void setUp() throws Exception
    {
        context = RuntimeEnvironment.application;

//        Intent intent = new Intent();
//        intent.putExtra("roomTitle", "Title");
//        intent.putExtra("roomState","Subtitle");

        }

    @Test
    public void postsRecycleViewHomeAdapter() {
        // Set up dummy data
        List<RoomProduct> roomProductList = Arrays.asList(
                new RoomProduct(0, R.drawable.ic_launcher_background,"Tap", "On" , 05f),
                new RoomProduct(1, R.drawable.ic_launcher_background, "Shower", "Running", 0.5f),
                new RoomProduct(2, R.drawable.ic_launcher_background, "TV Channel", "53", 0.5f)
        );

        RoomAdapter adapter = new RoomAdapter(context,roomProductList);

        RecyclerView rvParent = new RecyclerView(context);
        rvParent.setLayoutManager(new LinearLayoutManager(context));

        // Run test On onBindViewHolder and ViewHolder on dummy data
        RoomAdapter.ItemViewAdapterHolder viewHolder = adapter.onCreateViewHolder(rvParent, 0);

        //Test number 1
        adapter.onBindViewHolder(viewHolder, 0);
        assertEquals("Tap", viewHolder.roomItem.getText());
        assertEquals("On", viewHolder.roomState.getText());
        ShadowDrawable shadowDrawable = Shadows.shadowOf(viewHolder.roomImageItem.getDrawable());
        assertEquals(R.drawable.ic_launcher_background, shadowDrawable.getCreatedFromResId());


        //Test number 2
        adapter.onBindViewHolder(viewHolder,1);
        assertEquals("Shower", viewHolder.roomItem.getText());
        assertEquals("Running", viewHolder.roomState.getText());
        ShadowDrawable shadowDrawable1 = Shadows.shadowOf(viewHolder.roomImageItem.getDrawable());
        assertEquals(R.drawable.ic_launcher_background, shadowDrawable1.getCreatedFromResId());

        //Test number 3
        adapter.onBindViewHolder(viewHolder, 2);
        assertEquals("TV Channel", viewHolder.roomItem.getText());
        assertEquals("53", viewHolder.roomState.getText());
        ShadowDrawable shadowDrawable2 = Shadows.shadowOf(viewHolder.roomImageItem.getDrawable());
        assertEquals(R.drawable.ic_launcher_background, shadowDrawable2.getCreatedFromResId());

    }
}