Question

我正在尝试在RecyclerAdapter Object.keys(features)中包含的ImageView中加载缩略图，但这需要一个上下文。从RecyclerAdapter可以获得我的应用程序的MainActivity的上下文？我想要这样做，还是应该将图像加载到别处？

这些是我的课程。当然，RecyclerAdapater不会编译，但它代表了我正在尝试做的事情。

MainActivity：

Picasso.with(context).load(stringUrl).into(imageView);

RecyclerAdapter：

public class MainActivity extends AppCompatActivity implements MainScreenContract.View {

    ArrayList<String> list;

    // Objects for RecyclerView
    private RecyclerView recyclerView;
    private RecyclerView.Adapter recyclerAdapter;
    private RecyclerView.LayoutManager recyclerLayoutManager;

    @Inject
    MainScreenPresenter mainPresenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Timber.plant(new Timber.DebugTree() {
            // Add the line number to the tag
            @Override
            protected String createStackElementTag(StackTraceElement element) {
                return super.createStackElementTag(element) + ':' + element.getLineNumber();
            }
        });

        // RecyclerView implementation
        recyclerView = (RecyclerView) findViewById(R.id.my_list);
        // set to true because all images will be the same size
        recyclerView.setHasFixedSize(true);

        recyclerLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(recyclerLayoutManager);


        DaggerMainScreenComponent.builder()
                .netComponent(((App) getApplicationContext()).getNetComponent())
                .mainScreenModule(new MainScreenModule(this))
                .build().inject(this);

        //Call the method in MainPresenter to make Network Request
        mainPresenter.loadVideo();
    }

    @Override
    public void showVideos(Video video){
        // Loop through the posts, get the title of the post, and add it to our list object
        // TODO: Simplify these references with a variable?
        for(int i = 0; i < video.getResults().size(); i++){
            // TODO: add second for loop, or simplyfy and get rid of Video object
            list.add(video.getResults().get(i).getSiteDetailUrl());
            //list.add(video.get(i).getSiteDetailUrl());
            Timber.d("List item " + i + " = " + list.get(i));
        }

        // RecyclerView implementation
        recyclerAdapter = new MainScreenRecyclerAdapter(list);
        recyclerView.setAdapter(recyclerAdapter);
    }

    @Override
    public void showError(String message){
        // Show error message text as a Toast message
        Toast.makeText(getApplicationContext(), "Error" + message, Toast.LENGTH_SHORT).show();
        Timber.e("Error: " + message);
    }

    @Override
    public void showComplete(){
        // Show completed Toast message
        Toast.makeText(getApplicationContext(), "Complete", Toast.LENGTH_SHORT).show();
    }
}

谢谢！

Answer 1

您需要将上下文作为构造函数参数传递，然后使用此上下文

private Context mContext;
public MainScreenRecyclerAdapter (Context context) {
    mContext = context;
}


@Override 
    public void onBindViewHolder(ViewHolder holder, int position) {    
        String imageUrl = dataset.get(position);
        Timber.d("Image URL: " + imageUrl);

        ImageView view = holder.imageView;

        Picasso.with(MainActivity.context).load(imageUrl).into(view);
    }

如何使用Pilasso从RecyclerAdapter加载图像？

1 个答案: