在使用CursorLoader时将光标放入RecyclerView项目中点击

Question

嗨我正在使用this库来实现带有CursorLoader的RecyclerView。它工作正常，但我想要的是单击RecyclerView项目时获取光标。

如果是的ListView我可以很容易地通过

Cursor cursor = (Cursor) listView.getAdapter.getItem(position); 

在ListView的项目单击

得到光标;

但我不能用RecyclerView做同样的事情。这个怎么做？

我已经试过：

public class MovieAdapter extends RecyclerViewCursorAdapter<MovieAdapter.MovieViewHolder>{ 

/** 
* Column projection for the query to pull Movies from the database. 
*/ 
public static final String[] MOVIE_COLUMNS = new String[] { 
     MovieContract.MovieEntry.TABLE_NAME + "." + MovieContract.MovieEntry._ID, 
     MovieContract.MovieEntry.COLUMN_NAME 
}; 

/** 
* Index of the name column. 
*/ 
private static final int NAME_INDEX = 1; 

/** 
* Constructor. 
* @param context The Context the Adapter is displayed in. 
*/ 
public MovieAdapter(Context context) { 
    super(context); 

    setupCursorAdapter(null, 0, R.layout.list_item_movie, false); 
} 

/** 
* Returns the ViewHolder to use for this adapter. 
*/ 
@Override 
public MovieViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    return new MovieViewHolder(mCursorAdapter.newView(mContext, mCursorAdapter.getCursor(), parent)); 
} 

/** 
* Moves the Cursor of the CursorAdapter to the appropriate position and binds the view for 
* that item. 
*/ 
@Override 
public void onBindViewHolder(MovieViewHolder holder, int position) { 
    // Move cursor to this position 
    mCursorAdapter.getCursor().moveToPosition(position); 

    // Set the ViewHolder 
    setViewHolder(holder); 

    // Bind this view 
    mCursorAdapter.bindView(null, mContext, mCursorAdapter.getCursor()); 
} 

/** 
* ViewHolder used to display a movie name. 
*/ 
public class MovieViewHolder extends RecyclerViewCursorViewHolder { 
    public final TextView mMovieName; 

    public MovieViewHolder(View view) { 
     super(view); 

     mMovieName = (TextView) view.findViewById(R.id.movie_name); 

    } 

    @Override 
    public void bindCursor(Cursor cursor) { 
     mMovieName.setText(cursor.getString(NAME_INDEX)); 
     mMovieName.setTag(mCursorAdapter.getCursor()); 
     mMovieName.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if(v.getTag()!=null){ 
        Cursor cursorTag = (Cursor)v.getTag(); 

        **//Here I get last item's name in every item click using both cursorTag and cursor.** 
        Toast.makeText(mContext, "SSSSS "+cursor.getString(NAME_INDEX),Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 

    } 
    } 
} 

Answer 1

适配器有一个受保护的成员变量mCursor。您可以使用此与

if (mCursor != null) { 
    mCursor.moveToPosition(position) 
    //TODO: handle your functionality here (i.e. mCursor now points to the correct item) 
} 

但是那个特定的库提供一个CursorAdapter这更是一个黑客不能真正解决问题的检索预期光标。我建议使用更完整的库，如RecyclerExt，它可以控制一切，而不是试图将真正的功能交给ListView CursorAdapter

Answer 2

下面是我通过遵循@ RocketSpock的答案来修复它的方法。

@Override 
public void onBindViewHolder(MovieViewHolder holder, int position) { 
    // Move cursor to this position 
    mCursorAdapter.getCursor().moveToPosition(position); 

    // Set the ViewHolder 
    setViewHolder(holder); 

    // Bind this view 
    mCursorAdapter.bindView(null, mContext, mCursorAdapter.getCursor()); 
    holder.view.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      mCursorAdapter.getCursor().moveToPosition(position); 
      Toast.makeText(mContext, "SSSSS "+mCursorAdapter.getCursor() 
        .getString(NAME_INDEX),Toast.LENGTH_SHORT).show(); 
     } 
    }); 

} 

/** 
* ViewHolder used to display a movie name. 
*/ 
public class MovieViewHolder extends RecyclerViewCursorViewHolder { 
    public final TextView mMovieName; 
    View view; 

    public MovieViewHolder(View view) { 
     super(view); 

     this.view = view; 
     mMovieName = (TextView) view.findViewById(R.id.movie_name); 
    } 

    @Override 
    public void bindCursor(Cursor cursor) { 
     mMovieName.setText(mCursorAdapter.getCursor().getString(NAME_INDEX)); 

    } 

}