如何为RecyclerView创建上下文菜单
如何为RecyclerView创建上下文菜单
提问于 2014-10-20 21:30:35
我如何实现RecyclerView?的上下文菜单显然调用registerForContextMenu(recyclerView)不起作用。我从一个片段中调用它。有没有人成功地实现了这一点？
回答 13
Stack Overflow用户
发布于 2015-01-11 19:20:42
感谢您的信息和评论。我能够在Recyclerview中实现项目的ContextMenu。
下面是我所做的
在片段的onViewCreated方法或活动的onCreate方法中：
registerForContextMenu(mRecyclerView);然后在适配器添加中
private int position;
public int getPosition() {
return position;
}
public void setPosition(int position) {
this.position = position;
}使ViewHolder类实现OnCreateContextMenuListener
public static class ViewHolder extends RecyclerView.ViewHolder
implements View.OnCreateContextMenuListener {
public ImageView icon;
public TextView fileName;
public ImageButton menuButton;
public ViewHolder(View v) {
super(v);
icon = (ImageView)v.findViewById(R.id.file_icon);
fileName = (TextView)v.findViewById(R.id.file_name);
menuButton = (ImageButton)v.findViewById(R.id.menu_button);
v.setOnCreateContextMenuListener(this);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenu.ContextMenuInfo menuInfo) {
//menuInfo is null
menu.add(Menu.NONE, R.id.ctx_menu_remove_backup,
Menu.NONE, R.string.remove_backup);
menu.add(Menu.NONE, R.id.ctx_menu_restore_backup,
Menu.NONE, R.string.restore_backup);
}
}onBindViewHolder方法在holder.itemView上添加OnLongClickListener以在加载上下文菜单之前捕获位置：
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
setPosition(holder.getPosition());
return false;
}
});然后在onViewRecycled中删除侦听器，这样就不会出现引用问题。(可能不需要)。
@Override
public void onViewRecycled(ViewHolder holder) {
holder.itemView.setOnLongClickListener(null);
super.onViewRecycled(holder);
}最后，在片段/Activity中，覆盖onContextItemSelected，如下所示：
@Override
public boolean onContextItemSelected(MenuItem item) {
int position = -1;
try {
position = ((BackupRestoreListAdapter)getAdapter()).getPosition();
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage(), e);
return super.onContextItemSelected(item);
}
switch (item.getItemId()) {
case R.id.ctx_menu_remove_backup:
// do your stuff
break;
case R.id.ctx_menu_restore_backup:
// do your stuff
break;
}
return super.onContextItemSelected(item);
}Stack Overflow用户
发布于 2015-04-23 21:59:26
当前答案不正确。下面是一个有效的实现：
public class ContextMenuRecyclerView extends RecyclerView {
private RecyclerViewContextMenuInfo mContextMenuInfo;
@Override
protected ContextMenu.ContextMenuInfo getContextMenuInfo() {
return mContextMenuInfo;
}
@Override
public boolean showContextMenuForChild(View originalView) {
final int longPressPosition = getChildPosition(originalView);
if (longPressPosition >= 0) {
final long longPressId = getAdapter().getItemId(longPressPosition);
mContextMenuInfo = new RecyclerViewContextMenuInfo(longPressPosition, longPressId);
return super.showContextMenuForChild(originalView);
}
return false;
}
public static class RecyclerViewContextMenuInfo implements ContextMenu.ContextMenuInfo {
public RecyclerViewContextMenuInfo(int position, long id) {
this.position = position;
this.id = id;
}
final public int position;
final public long id;
}
}在您的片段(或活动)中：
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mRecyclerView = view.findViewById(R.id.recyclerview);
registerForContextMenu(mRecyclerView);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
// inflate menu
MenuInflater inflater = getActivity().getMenuInflater();
inflater.inflate(R.menu.my_context_menu, menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
return super.onContextItemSelected(item);
RecyclerViewContextMenuInfo info = (RecyclerViewContextMenuInfo) item.getMenuInfo();
// handle menu item here
}最后，在你的ViewHolder中：
class MyViewHolder extends RecyclerView.View.ViewHolder {
...
private void onLongClick() {
itemView.showContextMenu();
}
}Stack Overflow用户
发布于 2015-11-11 21:35:37
在recycleView中对View项目尝试此操作
.setOnCreateContextMenuListener(new View.OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
menu.add("delete").setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
//do what u want
return true;
}
});
}
});您可以将其与将数据设置为ViewHolder项一起使用
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原文链接：
https://stackoverflow.com/questions/26466877
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