android中RecyclerView的应用

导包 compile ‘com.android.support:recyclerview-v7:24.2.1’xml中设置适配器,ViewHolder Viewholder继承 RecyclerView中的ViewHolder 构造方法中初始化所有的组件 适配器继承与 RecyclerView中的Adapter，并泛型给上面设置的ViewHolder getItemCount 返回条目数量 createViewHolder 导入item的布局，创建ViewHolder，只调用一屏的数据, bindViewHolder 设置每个item中的数据布局管理器 瀑布流和网格 OnItemClick和OnItemLongClick

手动设置回调 1. 建立回调接口？在你需要返回数据的地方 2. 在需要拿到数据的地方创建监听器 3. 在返回地方调用接口的方法。

示例，利用RecycleView实现瀑布流，

MianActivity 类

public class MainActivity extends AppCompatActivity { RecyclerView recycler; List<Img> mList = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recycler = (RecyclerView) findViewById(R.id.recycler); //图片需要自己导入 mList.add(new Img(R.mipmap.p01,"一二三")); mList.add(new Img(R.mipmap.p02,"一二三")); mList.add(new Img(R.mipmap.p03,"一二三")); mList.add(new Img(R.mipmap.p04,"一二三")); mList.add(new Img(R.mipmap.p05,"一二三")); mList.add(new Img(R.mipmap.p06,"一二三")); mList.add(new Img(R.mipmap.p07,"一二三")); mList.add(new Img(R.mipmap.p08,"一二三")); mList.add(new Img(R.mipmap.p09,"一二三")); mList.add(new Img(R.mipmap.p10,"一二三")); mList.add(new Img(R.mipmap.p11,"一二三")); mList.add(new Img(R.mipmap.p12,"一二三")); mList.add(new Img(R.mipmap.p13,"一二三")); mList.add(new Img(R.mipmap.p14,"一二三")); mList.add(new Img(R.mipmap.p15,"一二三")); mList.add(new Img(R.mipmap.p16,"一二三"));mList.add(new Img(R.mipmap.p17,"一二三")); mList.add(new Img(R.mipmap.p18,"一二三")); recycler.setAdapter(new MyAdapter()); //没有布局管理器 // recycler.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false)); //recycler.setLayoutManager(new GridLayoutManager(this,1)); // recycler.setLayoutManager(new GridLayoutManager(this,1,LinearLayoutManager.HORIZONTAL,false)); // recycler.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.HORIZONTAL)); recycler.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL)); } //布局的内容组件 class MyViewHolder extends RecyclerView.ViewHolder { TextView tv; ImageView iv; public MyViewHolder(View itemView) { super(itemView); tv = (TextView) itemView.findViewById(R.id.tv); iv = (ImageView) itemView.findViewById(R.id.iv); } } //适配器 class MyAdapter extends RecyclerView.Adapter<MyViewHolder> { /** * @param parent * @param viewType * @return 当一个页面没有加载完毕的情况，会持续的调用该方法 */ @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { //创建ViewHolder //导入布局 View layout = View.inflate(getBaseContext(), R.layout.item_layout, null); MyViewHolder viewHolder = new MyViewHolder(layout); return viewHolder; } @Override public void onBindViewHolder(MyViewHolder holder, int position) { //为每一布局设置属性 //holder 布局组件 //position 当前第几项 list.get(position); Img img = mList.get(position); holder.tv.setText(img.text); holder.iv.setImageResource(img.imgId); } @Override public int getItemCount() { //有多少个item return mList.size(); } } //数据 class Img { int imgId; String text; public Img(int imgId, String text) { this.imgId = imgId; this.text = text; } } }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context="com.example.administrator.lesson10_recyclerview.MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recycler" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>

item_layout.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <ImageView android:id="@+id/iv" android:layout_width="match_parent" android:layout_height="wrap_content" android:adjustViewBounds="true" android:scaleType="fitXY" android:src="@mipmap/ic_launcher" /> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="文字" android:textSize="18sp" /> </LinearLayout>