Question

在<{1}}中显示字符串和图标列表的最简单的方法是什么？

对于RecyclerView，我使用以下代码（此处为a full project at GitHub），无需单独的适配器：

app screenshot

ListView

我想知道如何以同样简单的方式将mListView = (ListView) findViewById(R.id.list_view); mListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mPlanets) { @Override public View getView(int position, View convertView, ViewGroup parent) { TextView view = (TextView) super.getView(position, convertView, parent); view.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_stars_black_24dp, 0, 0, 0); return view; } }); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(getApplicationContext(), "You have clicked " + mPlanets[position], Toast.LENGTH_LONG).show(); } });和ArrayAdapter与RecyclerView一起使用，即没有自定义布局和适配器。

Answer 1

Buddy这是最简单的方式

首先在 build.gradle 文件

中添加依赖项

compile 'com.android.support:recyclerview-v7:21.0.+'

在MainActivity中定义RecyclerView对象

private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private ArrayList<String> planetList=new ArrayList();
//Other Stuff

protected void onCreate(Bundle savedInstanceState) {
    //Other Stuff and initialize planetList with all the planets name before passing it to adapter

    recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);

    adapter = new PlanetAdapter(planetList,getApplicationContext());
    recyclerView.setAdapter(adapter);
}

主要的Buzz杀手 PlanetAdapter ，您必须定义PlanetAdapter，它扩展了RecyclerView.Adapter

public class PlanetAdapter extends RecyclerView.Adapter<PlanetAdapter.PlanetViewHolder> {

    ArrayList<String> planetList;

    public PlanetAdapter(ArrayList<String> planetList, Context context) {
        this.planetList = planetList;
    }

    @Override
    public PlanetAdapter.PlanetViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.planet_row,parent,false);
        PlanetViewHolder viewHolder=new PlanetViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(PlanetAdapter.PlanetViewHolder holder, int position) {
        holder.image.setImageResource(R.drawable.planetimage);
        holder.text.setText(planetList.get(position).toString());
    }

    @Override
    public int getItemCount() {
        return planetList.size();
    }

    public static class PlanetViewHolder extends RecyclerView.ViewHolder{

        protected ImageView image;
        protected TextView text;

        public PlanetViewHolder(View itemView) {
            super(itemView);
            image= (ImageView) itemView.findViewById(R.id.image_id);
            text= (TextView) itemView.findViewById(R.id.text_id);
        }
    }
}

4.main_activity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
      <android.support.v7.widget.RecyclerView
           android:id="@+id/recycler_view"
           android:layout_width="match_parent"
           android:layout_height="match_parent"/>
</LinearLayout>

最后但并非最不重要的planet_row.xml

<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal">

     <ImageView
          android:layout_width="40dp"
          android:layout_height="40dp"
          android:id="@+id/image_id"/>

     <TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Planet Name"
          android:id="@+id/text_id"/>
</LinearLayout>

Answer 2

我已经在MainActivity.java中用几行简化了L-X的解决方案（谢谢！）：

首先是一个带有点击监听器的ViewHolder类：

private class PlanetViewHolder
        extends RecyclerView.ViewHolder
        implements View.OnClickListener {

    public PlanetViewHolder(View v) {
        super(v);
        v.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Toast.makeText(getApplicationContext(),
                "You have clicked " + ((TextView) v).getText(),
                Toast.LENGTH_LONG).show();
    }
}

然后适配器覆盖3个抽象方法并使用android.R.layout.simple_list_item_1：

    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    mRecyclerView.setAdapter(new RecyclerView.Adapter<PlanetViewHolder>() {

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

        @Override
        public void onBindViewHolder(PlanetViewHolder vh, int position) {
            TextView tv = (TextView) vh.itemView;
            tv.setText(mPlanets[position]);
            tv.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_stars_black_24dp, 0, 0, 0);
        }

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

上面的代码将字符串mPlanets的数组显示为：

在RecyclerView中使用图标显示字符串的最简单方法

2 个答案: