android:entries in recyclerview

问题:

I have used listview with entries attribute like below :

<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:entries="@array/fi"/>

Now i am converting it to RecyclerView

<android.support.v7.widget.RecyclerView
    android:id="@+id/rv"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

I want to know whether we have android:entries attribute in RecyclerView? Or any other attribute instead of entries?

回答1:

As correctly explained in the other answers there isn't an attribute to fill the RecyclerView from xml. However using the Android Databinding you can create a similar attribute quite easily:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:entries="@{@stringArray/fi}"
        app:layoutManager="android.support.v7.widget.LinearLayoutManager"/>
</layout>

Here the binding adapter definition:

import android.databinding.BindingAdapter;

public class RecyclerViewBindings {

    @BindingAdapter("entries")
    public static void entries(RecyclerView recyclerView, String[] array) {
        recyclerView.setAdapter(new SimpleArrayAdapter(array));
    }

    static class SimpleArrayAdapter extends RecyclerView.Adapter<SimpleHolder> {

        private final String[] mArray;

        public SimpleArrayAdapter(String[] array) {
            mArray = array;
        }

        @Override
        public SimpleHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
            final View view = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
            return new SimpleHolder(view);
        }

        @Override
        public void onBindViewHolder(SimpleHolder holder, int position) {
            holder.mTextView.setText(mArray[position]);
        }

        @Override
        public int getItemCount() {
            return mArray.length;
        }
    }

    static class SimpleHolder extends RecyclerView.ViewHolder {

        private final TextView mTextView;

        public SimpleHolder(View itemView) {
            super(itemView);
            mTextView = (TextView) itemView.findViewById(android.R.id.text1);
        }
    }
}

Then you have to use the DataBindingUtil methods for inflate the layout.

Inflate inside an Activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    DataBindingUtil.setContentView(this, R.layout.content_main);
}

Inflate inside a Fragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    ContentMainBinding bindings = DataBindingUtil.inflate(inflater, R.layout.content_main, container, false);
    return bindings.getRoot();
}

回答2:

No. There is no such directly available attribute in RecyclerView. You have to do it from java code programatically using LayoutManager and RecyclerView.Adapter. Refer this answer.

REASON: As we know, RecyclerView won't inflate until we set a LayoutManager to it. Also, LayoutManager is necessary to inflate individual item views of RecyclerView. These individual item views are retrieved from the RecyclerView.Adapter. So, until you set both the LayoutManager and RecyclerView.Adapter to RecyclerView, you can't use RecyclerView.

I hope this answer helps you.

回答3:

I'm afraid this is not possible out of the box, you can extend the RecyclerView and define your own custom attribute which accepts a string array, then you would populate your RecyclerView Adapter with these values.

Check this link: http://developer.android.com/training/custom-views/create-view.html#customattr

回答4:

No,In android, Recyclerview doesn't hold android:entries or like attributes. RecyclerView is successor of listview but still missing entries attribute and onclicklistener

here is android official documentation link

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html

This site also describes about the android:entries attribute.

http://androidride.com/easiest-way-make-listview-android/