[英]Recyclerview adapter with CursorAdapter
我想實現一個適配器Recyclerview
與使用CusrorAdapter
如下作為解決方案的一個建議這里 。
我是Android的新手,我不太了解如何重寫CursorAdapter
的newView方法和bindView
方法。 我也是猜我的適配器將有多個變量ViewHolder
,而不是一個(查看V1)因為有幾個textViews
在我的布局文件,但我只是不知道如何將它們中的代碼。
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);
}
}
盡管我不了解它的細節,但還是設法使它起作用。 基本上,我添加了ViewHolder
變量作為類變量,並更改了代碼的某些部分。 當您在名為row.xml
的布局文件中有2個TextView
項( name
和date
)時,解決方案如下row.xml
:
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;
}
}
如果有人知道它為什么起作用,請隨時加入討論。 謝謝。
而不是使用View創建ViewHolder,而應使用布局上具有的所有對象(所需的所有元素)創建ViewHolder。 必須在onCreateViewHolder方法中創建(填充)布局視圖。
像這樣:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
{
class ViewHolder extends RecyclerView.ViewHolder {
TextView textView1;
TextView textView2;
public ViewHolder(View itemView) {
super(itemView);
textView1 = (TextView) itemView.findViewById(R.id.textView1);
textView2 = (TextView) itemView.findViewById(R.id.textView2);
}
public void insertView(String result1, String result2) {
textView1.setText(result1);
textView2.setText(result2);
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_name, parent, false);
RecyclerView.ViewHolder viewHolder = new ViewHolder(itemView);
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((ViewHolder) holder).insertView(results.get(position).getResult1(), results.get(position).getResult2());
}
@Override
public int getItemCount() {
return results.size();
}
}
您可以使用ORMSugar進行持久化。 不過,如果您可以訪問適配器外部的數據庫,那就更好了。 您將從數據庫中獲取必要的信息,並將該信息傳遞給適配器構造函數。
如果您需要一個例子,只需要告訴我即可。
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