将 RecyclerView 的项目内容获取到另一个 activity

Question

下面的class定义了电影的内容。

public class MovieCard {
String mAlbumArtURL;
String mName;
String mSynopsis;
String mRating;
String mReleaseDate;

public MovieCard(String albumArtURL, String name, String synopsis, String rating, String releaseDate) {
    this.mAlbumArtURL = albumArtURL;
    this.mName = name;
    this.mSynopsis = synopsis;
    this.mRating = rating;
    this.mReleaseDate = releaseDate;
}

public String getAlbumArtURL() {
    return mAlbumArtURL;
}

public void setAlbumArtURL(String mAlbumArtURL) {
    this.mAlbumArtURL = mAlbumArtURL;
}

public String getName() {
    return mName;
}

public void setName(String mName) {
    this.mName = mName;
}

public String getSynopsis() {
    return mSynopsis;
}

public void setSynopsis(String mSynopsis) {
    this.mSynopsis = mSynopsis;
}

public String getRating() {
    return mRating;
}

public void setRating(String mRating) {
    this.mRating = mRating;
}

public String getReleaseDate() {
    return mReleaseDate;
}

public void setReleaseDate(String mReleaseDate) {
    this.mReleaseDate = mReleaseDate;
}

}

应用程序的第一个 activity 给出了电影专辑封面列表。渲染数据是从 API 中获取的。数据包括电影名称、上映日期、剧情简介等。但第一个 activity 仅显示海报（专辑封面）。现在，我将一个 OnclickListener 分配给 ViewHolder class，以在用户单击任何海报时启动一个新的 activity。第二个 activity 需要包含点击的电影海报的详细信息。整个数据在第一个 activity 的 AsyncTask 中获取。我可以启动新的 activity，但我无法理解如何将单击的 ViewHolder 的所需内容发送到第二个 activity。我知道数据是使用 'putextra' 发送的，但问题是我不知道要发送什么。我只能访问ViewHolder的位置，不能访问它的内容。

这是适配器的代码：

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MovieCardHolder> {

List<MovieCard> mMovieCards;
Context context;

public CustomAdapter(List<MovieCard> cards, Context c) {
    this.mMovieCards = cards;
    this.context = c;
}

@Override
public CustomAdapter.MovieCardHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.movie_card, parent, false);
    MovieCardHolder movieCardHolder = new MovieCardHolder(view, context);
    return movieCardHolder;
}

@Override
public void onBindViewHolder(CustomAdapter.MovieCardHolder holder, int position) {
    holder.mMovieName.setText(mMovieCards.get(position).mName);
    Picasso.with(context).load(mMovieCards.get(position).mAlbumArtURL).into(holder.mMoviePoster);
}

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

public class MovieCardHolder extends RecyclerView.ViewHolder {
    ImageView mMoviePoster;
    TextView mMovieName;

    public MovieCardHolder(final View itemView, final Context context) {
        super(itemView);
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                // Need details of the movie to be sent to the next activity.

                Intent intent = new Intent(context,MovieDetail.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intent);
            }
        });
        mMoviePoster = (ImageView) itemView.findViewById(R.id.movie_poster);
        mMovieName = (TextView) itemView.findViewById(R.id.movie_name);
    }
}

}

提前致谢。

Answer 1

您可以执行 mMovieCards.get(position) 来获取您想要的 MovieCard。

您需要通过实现将 MovieCard 声明为 Serializable，如下所示：

class MovieCard implements Serializable

并通过 putExtras(String key, Serializable value) 下的 Intent 发送它，最后使用您的 onBindViewHolder() 回调。

@Override
public void onBindViewHolder(CustomAdapter.MovieCardHolder holder, int position) {
    // maybe declare a ViewGroup class member in your holder
    holder.parent.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent intent = new Intent(context, AnotherActivity.class);
                        intent.putExtra("my-object", mMovieCards.get(position));
                        context.startActivity(intent);
                    }
                });
}

在你的另一个 activity 中像这样获取你的 MovieCard：

MovieCard m = (MovieCard) getIntent().getSerializableExtra("my-object");

Answer 2

您可以将 MovieCard 附加到根 View;

public class MovieCardHolder extends RecyclerView.ViewHolder {
View root;
ImageView mMoviePoster;
TextView mMovieName;

public MovieCardHolder(final ViewGroup itemView, final Context context) {
    super(itemView);
    root = itemView;
    root.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

             // Need details of the movie to be sent to the next activity.
            MovieCard card = (MovieCard)v.getTag();
            Intent intent = new Intent(context, MovieDetail.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.putExtra("EXTRA_ART_URL", card.getAlbumArtURL());
            intent.putExtra("EXTRA_NAME", card.getName());
            intent.putExtra("EXTRA_Synopsis", card.getSynopsis());
            intent.putExtra("EXTRA_Rating", card.getRating());
            intent.putExtra("EXTRA_ReleaseDate", card.getReleaseDate());
            context.startActivity(intent);
        }
    });
    mMoviePoster = (ImageView) root.findViewById(R.id.movie_poster);
    mMovieName = (TextView) root.findViewById(R.id.movie_name);

    }
}

并且：

@Override
public void onBindViewHolder(CustomAdapter.MovieCardHolder holder, int position) {
    holder.root.setTag(mMovieCards.get(position));
    holder.mMovieName.setText(mMovieCards.get(position).mName);
    Picasso.with(context).load(mMovieCards.get(position).mAlbumArtURL).into(holder.mMoviePoster);
}

在onCreate()的MovieDetail方法中

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    String artUrl = getIntent().getStringExtra("EXTRA_ART_URL");
    //and so on to the rest of Strings
}

将 RecyclerView 的项目内容获取到另一个 activity

Getting contents of an item of a RecyclerView to another activity

android

onclicklistener

android-recyclerview

android-viewholder