Java 在RecyclerView.Adapter中单击时传递数据

我的片段上有一个

RecyclerView

，显示了我从FTP服务器加载的某些文件。 我试图为每个项目设置一个

onClickListener

，因此当单击它时，将显示一个

对话框片段

，用户可以在其中选择是下载还是打开文件。
我的问题是：
我需要向我的对话发送2件东西：

目标片段，用户选择要执行的操作后，该片段将下载/打开文件。使用

setTargetFragment（）

很容易做到这一点，唯一的问题是我无法访问我的

RecyclerView.ViewHolder

中的片段

要下载/打开的文件的名称。这样对话框将把它发送到目标片段。这里的问题是，我无法访问

RecyclerView.ViewHolder

中的数据集，因为它是静态的，而我的数据集不是

为什么在视窗架上
如果有更好的地方，我很乐意听到。我试图在我的

RecyclerView.ViewHolder中删除该项的原因是它可以访问该位置（单击的项目）。我曾想过在
onBindViewHolder（）
上这样做，但在那里我可以访问数据集，但不能访问位置

我的适配器代码：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

公共类FileAdapter扩展了RecyclerView.Adapter{
public final String TAG=“FILES\u ADAPTER”；
私有FTPFile[]数据集；
//一些方法和材料。。。
公共静态类ViewHolder扩展了RecyclerView.ViewHolder{
公共最终字符串TAG=“FILES\u VH”；
私有最终文本视图名称文本视图；
私有最终文本视图信息文本视图；
私人最终影像视图；
公共视图持有者（视图v）{
超级（五）；
//定义ViewHolder视图的单击侦听器。
v、 setOnClickListener（新视图。OnClickListener（）{
@凌驾
公共void onClick（视图v）{
d（标记“Element”+getPosition（）+“clicked”）；
//在这里，我想打开对话框片段并开始下载/打开
}
});
nameTextView=（TextView）v.findViewById（R.id.fileNameTextView）；
infoTextView=（TextView）v.findViewById（R.id.fileInfoTextView）；
imageView=（imageView）v.findViewById（R.id.fileImageView）；
}
公共文本视图getNameTextView（）{
返回nameTextView；
}
公共图像视图getImageView（）{
返回图像视图；
}
公共文本视图getInfoTextView（）{
返回infoTextView；
}
}
}

---

非常感谢您的帮助。

因此我找到了解决方案，我在

onBindViewHolder（）

上创建了一个带有匹配参数的自定义

OnClickListener

，并将其设置为

ViewHolder

：
视图持有者：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

我的自定义侦听器：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

并在onBindViewHolder（）上添加以下代码：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

---

因此我找到了一个解决方案，我在

onBindViewHolder（）

上创建了一个带有匹配参数的自定义

OnClickListener

，并将其设置为

ViewHolder

：
视图持有者：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

我的自定义侦听器：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

并在onBindViewHolder（）上添加以下代码：

public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
    public final String TAG = "FILES_ADAPTER";
    private FTPFile[] dataset;

    //some methods and stuff...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final String TAG = "FILES_VH";
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;

        public ViewHolder(View v) {
            super(v);
            // Define click listener for the ViewHolder's View.
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d(TAG, "Element " + getPosition() + " clicked.");
                    //here i want to open the dialog fragment and start downloading/openning

                }
            });
            nameTextView = (TextView) v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView) v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView) v.findViewById(R.id.fileImageView);
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public ImageView getImageView() {
            return imageView;
        }

        public TextView getInfoTextView() {
            return infoTextView;
        }
    }

}

 public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView nameTextView;
        private final TextView infoTextView;
        private final ImageView imageView;
        public final String TAG = "FILES_VH";
        private View v;

        public ViewHolder(View v) {
            super(v);
            this.v = v;
            nameTextView = (TextView)v.findViewById(R.id.fileNameTextView);
            infoTextView = (TextView)v.findViewById(R.id.fileInfoTextView);
            imageView = (ImageView)v.findViewById(R.id.fileImageView);
        }

        public void setOnClickListener(View.OnClickListener listener){
            v.setOnClickListener(listener);
        }

}

private class downloadOnClickListener implements View.OnClickListener{
        RemoteFilesFragment fragment;
        String file;

        public downloadOnClickListener(RemoteFilesFragment fragment, String file){
            this.file = file;
            this.fragment = fragment;
        }

        @Override
        public void onClick(View v) {
            Log.d(TAG, "File " + file + " clicked.");
            DownloadDialog dialog = DownloadDialog.newInstance(file);
            dialog.setTargetFragment(fragment, 1);
            Log.e(TAG, fragment == null ? "fragment null" : "fragment not null");
            FragmentManager fm = fragment.getActivity().getSupportFragmentManager();
            dialog.show(fm, "Download");
        }
    }

holder.setOnClickListener(new downloadOnClickListener(fragment, dataset[position].getName()));

---

在

onClick（View v）

中，您可以调用

v.getLayoutParams（）

并将结果强制转换为

RecyclerView.LayoutParams

这对我有什么帮助？检查了我正在谈论的类的文档？是的，但它只帮助通过getAdapterPosition（）获得位置，我仍然无法访问实际数据。然后在

onCreateViewHolder

内部设置

OnClickListener

，

onCreateViewHolder

是

适配器的一部分，您可以访问数据模型，在Adapter中，您还可以调用
RecyclerView#getChildAdapterPosition
/
RecyclerView#getChildLayoutPosition
，因此无需在
onClick（视图v）
中使用
LayoutParams
，您可以调用
v.getLayoutParams（）
并将结果转换到
RecyclerView.LayoutParams
这对我有什么帮助？检查了我所说的类的文档？是的，但它只帮助通过getAdapterPosition（）获取位置，我仍然无法访问实际数据。然后在
onCreateViewHolder
中设置
OnClickListener
，
onCreateViewHolder
是您的
适配器的一部分，您可以在适配器中访问数据模型，也可以在适配器中调用
RecyclerView\getChildAdapterPosition
/
RecyclerView\getChildLayoutPosition
，因此无需使用
LayoutParams