我正在尝试使用Recyclerview
来实现CusrorAdapter
的适配器,如下所示,这是解决方案here之一所建议的。
我是Android的新手,我不太了解如何覆盖CursorAdapter
的newView方法和bindView
方法。我也猜想我的适配器在ViewHolder
中将有多个变量,而不是一个(View v1),因为我的布局文件中有多个textViews
,但是我只是不知道它们在代码中如何适合。
public class MyRecyclerAdapter extends Adapter<MyRecyclerAdapter.ViewHolder {
// PATCH: Because RecyclerView.Adapter in its current form doesn't natively support
// cursors, we "wrap" a CursorAdapter that will do all teh job for us
CursorAdapter mCursorAdapter;
Context mContext;
public MyRecyclerAdapter(Context context, Cursor c) {
mContext = context;
mCursorAdapter = new CursorAdapter(mContext, c, 0) {
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// Inflate the view here
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// Binding operations
}
};
}
public static class ViewHolder extends RecyclerView.ViewHolder{
View v1;
public ViewHolder(View itemView) {
super(itemView);
v1 = itemView.findViewById(R.id.v1);
}
}
@Override
public int getItemCount() {
return mCursorAdapter.getCount();
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
// Passing the binding operation to cursor loader
mCursorAdapter.bindView(holder.itemView, mContext, mCursorAdapter.getCursor());
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Passing the inflater job to the cursor-adapter
View v = mCursorAdapter.newView(mContext, mCursorAdapter.getCursor(), parent);
return new ViewHolder(v);
}
}
最佳答案
尽管我不了解它的细节,但还是设法使它起作用。基本上,我添加了ViewHolder
变量作为类变量,并更改了代码的某些部分。当您在名为TextView
的布局文件中有2个name
项(date
和row.xml
)时,解决方案如下所示:
public class MyRecyclerAdapter extends Adapter<MyRecyclerAdapter.ViewHolder>{
// PATCH: Because RecyclerView.Adapter in its current form doesn't natively support
// cursors, we "wrap" a CursorAdapter that will do all teh job for us
private CursorAdapter mCursorAdapter;
private Context mContext;
private ViewHolder holder;
public MyRecyclerAdapter(Context context, Cursor c) {
mContext = context;
mCursorAdapter = new CursorAdapter(mContext, c, 0) {
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// Inflate the view here
View v = LayoutInflater.from(context)
.inflate(R.layout.row_rv, parent, false);
return v;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// Binding operations
String name = cursor.getString(cursor.getColumnIndexOrThrow("name"));
String date = cursor.getString(cursor.getColumnIndexOrThrow("date"));
holder.tvName.setText(name);
holder.tvDate.setText(date);
}
};
}
public static class ViewHolder extends RecyclerView.ViewHolder{
public TextView tvName;
public TextView tvDate;
public ViewHolder(View itemView) {
super(itemView);
tvName = (TextView) itemView.findViewById(R.id.name);
tvDate = (TextView) itemView.findViewById(R.id.date);
}
}
@Override
public int getItemCount() {
return mCursorAdapter.getCount();
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
// Passing the binding operation to cursor loader
mcursorAdapter.getCursor().moveToPosition(position);
mCursorAdapter.bindView(holder.itemView, mContext, mCursorAdapter.getCursor());
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Passing the inflater job to the cursor-adapter
View v = mCursorAdapter.newView(mContext, mCursorAdapter.getCursor(), parent);
holder = new ViewHolder(v);
return holder;
}
}
如果有人知道它为什么起作用,请随时加入讨论。谢谢。