强大的滚动控件——RecyclerView（一）基本用法

用前准备

打开app/build.gradle文件，在dependencies闭包中添加如下内容：
compile ‘com.android.support:recyclerview-v7:24.2.1’
如下

dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.1', {        exclude group: 'com.android.support', module: 'support-annotations'    })    compile 'com.android.support:appcompat-v7:24.2.1'    compile 'com.android.support:recyclerview-v7:24.2.1'    testCompile 'junit:junit:4.12'}

• XML文件

接下来是xml中的代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.sky.recyclerview.MainActivity">    <android.support.v7.widget.RecyclerView        android:id="@+id/recycler_view"        android:layout_width="match_parent"        android:layout_height="match_parent"        ></android.support.v7.widget.RecyclerView></LinearLayout>

这里面没什么好说的，width和height要设置为match_parent

• 接下来是适配器，新建的FruitAdapter类，让这个适配器继承RecyclerView.Adapter，并将泛型指定为FruitAdapter.ViewHolder。其中ViewHolder是我们在FruitAdapter中定义的一个内部类，代码如下：

public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {    private List<Fruit> mFruitList;    static class ViewHolder extends RecyclerView.ViewHolder{        ImageView fruitImage;        TextView fruitName;        public ViewHolder(View itemView) {            super(itemView);            fruitImage = (ImageView) itemView.findViewById(R.id.fruit_image);            fruitName = (TextView) itemView.findViewById(R.id.fruit_name);        }    }    /**     * 用于把要展示的数据源传进来，并赋值给一个全局变量mFruitList，我们后续的操作都将在这个数据源的基础上进行。     * @param mFruitList     */    public FruitAdapter(List<Fruit> mFruitList) {        this.mFruitList = mFruitList;    }    /**     * 用于创建ViewHolder实例的，并把加载出来的布局传入到构造函数当中，最后将viewholder的实例返回     * @param parent     * @param viewType     * @return     */    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);        ViewHolder viewHolder = new ViewHolder(view);        return viewHolder;    }    /**     * 用于对RecyclerView子项的数据进行赋值的，会在每个子项被滚动到屏幕内的时候执行，这里我们通过     * position参数得到当前项的Fruit实例，然后再将数据设置到ViewHolder的Imageview和textview当中即可，     * @param holder     * @param position     */    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        Fruit fruit = mFruitList.get(position);        holder.fruitImage.setImageResource(fruit.getImageId());        holder.fruitName.setText(fruit.getName());    }    @Override    public int getItemCount() {        return mFruitList.size();    }}

• 接下来就是Activity.class了
  其中一些重要的我都已经在代码中注释

public class MainActivity extends Activity {    private List<Fruit> fruitList = new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initFruit();        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);        /**         * 创建一个linearlayoutmaneger对象，并将他设置到recyclerview当中。layoutmanager用于指定         * recyclerview的布局方式，这里是线性布局的意思。可以实现和listview类似的效果。         *         * 接下来我们创建了Fruitadapter的实例，并将数据传进去         */        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);        recyclerView.setLayoutManager(linearLayoutManager);        FruitAdapter adapter = new FruitAdapter(fruitList);        recyclerView.setAdapter(adapter);    }    private void initFruit() {        Fruit apple = new Fruit("Apple",R.mipmap.ic_launcher);        fruitList.add(apple);        Fruit banana = new Fruit("banana",R.mipmap.ic_launcher);        fruitList.add(banana);        Fruit oragen = new Fruit("orange",R.mipmap.ic_launcher);        fruitList.add(oragen);        Fruit watermelon = new Fruit("watermelon",R.mipmap.ic_launcher);        fruitList.add(apple);        Fruit pear = new Fruit("pear",R.mipmap.ic_launcher);        fruitList.add(pear);        Fruit grape = new Fruit("grape",R.mipmap.ic_launcher);        fruitList.add(grape);        Fruit pineapple = new Fruit("pineapple",R.mipmap.ic_launcher);        fruitList.add(pineapple);        Fruit strawberry = new Fruit("strawberry",R.mipmap.ic_launcher);        fruitList.add(strawberry);        Fruit cherry = new Fruit("cherry",R.mipmap.ic_launcher);        fruitList.add(cherry);        Fruit a = new Fruit("a",R.mipmap.ic_launcher);        fruitList.add(a);        Fruit b = new Fruit("b",R.mipmap.ic_launcher);        fruitList.add(b);        Fruit c = new Fruit("c",R.mipmap.ic_launcher);        fruitList.add(c);        Fruit d = new Fruit("d",R.mipmap.ic_launcher);        fruitList.add(d);        Fruit e = new Fruit("e",R.mipmap.ic_launcher);        fruitList.add(e);        Fruit f = new Fruit("f",R.mipmap.ic_launcher);        fruitList.add(f);        Fruit g = new Fruit("g",R.mipmap.ic_launcher);        fruitList.add(g);        Fruit h = new Fruit("h",R.mipmap.ic_launcher);        fruitList.add(h);    }}

• 对了还有一个Fruit类我也顺便贴上来

/** * Created by sky on 2017/2/23. */public class Fruit {    private String name;    private int imageId;    public Fruit(String name, int imageId) {        this.name = name;        this.imageId = imageId;    }    public String getName() {        return name;    }    public int getImageId() {        return imageId;    }}

github地址：https://github.com/skysunlei/RecyclerViewBeat
接下来关于RecyclerView我还会更新几篇进阶型的，有问题的可以留言我会积极回复的

• 效果图
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