如何從回收站視圖中獲取字串值-有解無憂

我有一個電影的recyclerview，我需要電影名稱來使用intent putextra。我已經制作了點擊監聽器并獲得了配接器位置，但它只回傳圖片中的配接器陣列。

logcat 中的輸出圖片

我怎樣才能得到字串，所以我可以使用意圖 putextra？

這是我的recyclerview代碼

public class movieRecyclerViewAdapter extends RecyclerView.Adapter<movieRecyclerViewAdapter.myViewHolder> {

private static final String TAG = "movieRecyclerViewAdapter";
private onMovieClickListener movieClickListener;
private final ArrayList<movie> movies;

public movieRecyclerViewAdapter(ArrayList<movie> movieArrayList, onMovieClickListener onMovieClickListener){
    this.movies = movieArrayList;
    this.movieClickListener = onMovieClickListener;
    Log.d("mainMenuAdmin", "Adapter List size : "   movieArrayList.size() );
}

@NonNull
@Override
public movieRecyclerViewAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_movie, parent, false);
    return new myViewHolder(view, movieClickListener);
}

@Override
public void onBindViewHolder(@NonNull movieRecyclerViewAdapter.myViewHolder holder, int position) {
    Log.d(TAG, "onBindViewHolder: called");
    String img = movies.get(position).getMovie_image();
    holder.judul.setText(movies.get(position).getNamaMovie());
    holder.tahun.setText(movies.get(position).getTahunMovie());
    Picasso.get().load(img).error(R.mipmap.ic_launcher).placeholder(R.mipmap.ic_launcher_round).into(holder.image);

}

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

public static class myViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
    private final TextView judul, tahun;
    private final ImageView image;
    RelativeLayout parent;
    onMovieClickListener onMovieClickListener;

    public myViewHolder(@NonNull View itemView, onMovieClickListener onMovieClickListener) {
        super(itemView);
        judul = itemView.findViewById(R.id.txtJudul);
        tahun = itemView.findViewById(R.id.txtTahun);
        image = itemView.findViewById(R.id.imagePoster);
        parent = itemView.findViewById(R.id.parent_layout);
        this.onMovieClickListener = onMovieClickListener;

        itemView.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        onMovieClickListener.onMovieClick(view, this.getLayoutPosition());
    }
}

public interface onMovieClickListener{
    void onMovieClick(View v, int position);

}}

我已經嘗試了一切，但它仍然回傳陣列值而不是電影名稱的字串值

uj5u.com熱心網友回復：

您已經做出了很大的努力??，但是您在這里做的很少。讓我一步一步地向你解釋所有事情。

您需要來自點擊偵聽器的字串值，但您在點擊中傳遞了一個視圖位置。所以要解決這個問題，你首先需要像這樣改變你的界面。

    public interface onMovieClickListener{
        void onMovieClick(movie movie, int position);
    }

第二個錯誤是您的 ViewHolder 中沒有您的電影。這就是為什么你不能在你的監聽器中傳遞字串。要解決此問題，您需要更改 myViewHolder，如下所示。

    public static class myViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        private final TextView judul, tahun;
        private final ImageView image;
        RelativeLayout parent;
        movie movie;
        onMovieClickListener onMovieClickListener;

        public myViewHolder(@NonNull View itemView) {
            super(itemView);
            judul = itemView.findViewById(R.id.txtJudul);
            tahun = itemView.findViewById(R.id.txtTahun);
            image = itemView.findViewById(R.id.imagePoster);
            parent = itemView.findViewById(R.id.parent_layout);
            itemView.setOnClickListener(this);

        }
        

        public void bind(movie movie, onMovieClickListener onMovieClickListener)
        {
            this.movie = movie;
            this.onMovieClickListener = onMovieClickListener;
            
        }

        @Override
        public void onClick(View view) {
            onMovieClickListener.onMovieClick(movie, this.getLayoutPosition());
        }
    }

像這樣更改您的配接器功能。

    @NonNull
    @Override
    public movieRecyclerViewAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_movie, parent, false);
        return new myViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull movieRecyclerViewAdapter.myViewHolder holder, int position) {
        Log.d(TAG, "onBindViewHolder: called");
        String img = movies.get(position).getMovie_image();
        holder.judul.setText(movies.get(position).getNamaMovie());
        holder.tahun.setText(movies.get(position).getTahunMovie());
        Picasso.get().load(img).error(R.mipmap.ic_launcher).placeholder(R.mipmap.ic_launcher_round).into(holder.image);

        holder.bind(movies.get(position), this.movieClickListener);
    }

而已！！！

現在你的聽眾中有你的電影，你可以使用你的電影來獲取電影中的任何變數，比如電影名稱等。

我在這里粘貼整個 java 檔案，以便您可以復制和粘貼代碼進行測驗。

public class movieRecyclerViewAdapter extends RecyclerView.Adapter<movieRecyclerViewAdapter.myViewHolder> {

private static final String TAG = "movieRecyclerViewAdapter";
private onMovieClickListener movieClickListener;
private final ArrayList<movie> movies;

public movieRecyclerViewAdapter(ArrayList<movie> movieArrayList, onMovieClickListener onMovieClickListener){
    this.movies = movieArrayList;
    this.movieClickListener = onMovieClickListener;
    Log.d("mainMenuAdmin", "Adapter List size : "   movieArrayList.size() );
}

@NonNull
@Override
public movieRecyclerViewAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_movie, parent, false);
    return new myViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull movieRecyclerViewAdapter.myViewHolder holder, int position) {
    Log.d(TAG, "onBindViewHolder: called");
    String img = movies.get(position).getMovie_image();
    holder.judul.setText(movies.get(position).getNamaMovie());
    holder.tahun.setText(movies.get(position).getTahunMovie());
    Picasso.get().load(img).error(R.mipmap.ic_launcher).placeholder(R.mipmap.ic_launcher_round).into(holder.image);

    holder.bind(movies.get(position), this.movieClickListener);
}

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

public static class myViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
    private final TextView judul, tahun;
    private final ImageView image;
    RelativeLayout parent;
    movie movie;
    onMovieClickListener onMovieClickListener;

    public myViewHolder(@NonNull View itemView) {
        super(itemView);
        judul = itemView.findViewById(R.id.txtJudul);
        tahun = itemView.findViewById(R.id.txtTahun);
        image = itemView.findViewById(R.id.imagePoster);
        parent = itemView.findViewById(R.id.parent_layout);
        itemView.setOnClickListener(this);

    }


    public void bind(movie movie, onMovieClickListener onMovieClickListener)
    {
        this.movie = movie;
        this.onMovieClickListener = onMovieClickListener;

    }

    @Override
    public void onClick(View view) {
        onMovieClickListener.onMovieClick(movie, this.getLayoutPosition());
    }
}

public interface onMovieClickListener{
    void onMovieClick(movie movie, int position);

}}

幾點建議：

不要通過您的聽眾將 View 發送到您的活動/片段
您的變數的駱駝案例。
以大寫字母開頭的類名。

** 這幾個建議將使您的代碼更具可讀性。

快樂編碼??！！

uj5u.com熱心網友回復：

將介面偵聽器更改為：

public interface onMovieClickListener {
void onMovieClick(View v, Movie movie);
}

然后將您的 setOnClickListener 定義為：

itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {                   

            onMovieClickListener.onMovieClick(v, movies.get(getAdapterPosition()));
                }
            }
        });

您將能夠根據需要獲取選定的電影和顯示名稱。

轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/491103.html

標籤：爪哇安卓安卓工作室 android-recyclerview

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