安卓中RecyclerView的使用

1.创建一个主布局文件，里面只有FrameLayout，用于放置所要托管的活动:activity_main.xml:

<?xml version="1.0" encoding="utf-8"?><FrameLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/fragmentContainer"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 />

2.File->Project Structure->app->Dependencies->点击"+"号->Library Dependency->输入com.android.support:recyclerview-v7:25.0.1->确定
3.创建一个布局文件，里面有RecyclerView，用于显示可以回收的布局:fragment_reclclerview.xml

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

4.添加在RecyclerView里面显示的列表项目文件:list_item.xml:

<?xml version="1.0" encoding="utf-8"?><Button xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/button"
 android:layout_width="match_parent"
 android:layout_height="120dp"
 tools:text="Sound name"/>

5.添加用于保存用户信息的类User.java:

package com.example.wanglunhui.recycleview;
/*
*存储用户信息的类
 */
public class User {

private String mAddress;
private String mAge;
private String mSex;
private String mName;

public String getAddress() {
return mAddress;
    }

public void setAddress(String address) {
mAddress = address;
    }

public String getAge() {
return mAge;
    }

public void setAge(String age) {
mAge = age;
    }

public String getSex() {
return mSex;
    }

public void setSex(String sex) {
mSex = sex;
    }

public String getName() {
return mName;
    }

public void setName(String name) {
mName = name;
    }
}

6.主文件:MainActivity.java:

public class MainActivity extends AppCompatActivity {//AppCompatActivity是Fragment子类，所以继承AppCompatActivity也是继承Frgment
 @Override
    public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);//设置布局问Fragment布局，R.id.fragmentContainer在R.layout.activity_main中，所以先设置布局为它
 FragmentManager manager = getFragmentManager();
        Fragment fragment = manager.findFragmentById(R.id.fragmentContainer);//Fragment布局的id，用于显示托管的Activity

 if (fragment == null) {
            fragment = new MainFragment();
            manager.beginTransaction()
                    .add(R.id.fragmentContainer, fragment)//Fragment布局的id
 .commit();
        }
    }

}

7.托管活动的文件MainFragment.java:

public class MainFragment extends Fragment {    private List<User> mUserList;//存储用户信息 @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mUserList=new ArrayList<>();        for (int i = 0; i < 30; i++) {//随机添加30个用户信息 User user = new User();            user.setAddress("Address" + i);            user.setAge("Age" + i);            user.setName("Name" + i);            user.setSex("Sex" + i);            mUserList.add(user);        }    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        //显示的布局就为RecyclerView View view = inflater.inflate(R.layout.fragment_recyclerview, container, false);        RecyclerView recyclerView = (RecyclerView)view//获取RecyclerView实例 .findViewById(R.id.recycler_view);        recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3));//你想要控制其显示的方式，请通过布局管理器LayoutManager，这路设置成网格显示 //recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));//这里设置成线性的显示 recyclerView.setAdapter(new UserAdapter());        return view;    }    private class UserHolder extends RecyclerView.ViewHolder {//用于托管每一个用于显示的单个项目，注意它继承自RecyclerView.ViewHolder private Button mButton;        private User mUser;//每一个项目有一个按钮和对应的用户信息，所以有这两个属性 public UserHolder(LayoutInflater inflater, ViewGroup parent) {            super(inflater.inflate(R.layout.list_item, parent, false));//每一个项目在显示的时候都只是显示R.layout.list_item里面的按钮但实际上每一个按钮既有按钮，又有用户信息 mButton = (Button)itemView.findViewById(R.id.button);//Button这个按钮实例 mButton.setOnClickListener(new View.OnClickListener() {//设置布局管理器也是在Holder这里面设置的 @Override                public void onClick(View view) {                    //因为Adapter的BindViewHolder将每一个User都绑定了，所以这里可以直接使用 Toast.makeText(getActivity(), "姓名:"+mUser.getName()+"年龄:"+mUser.getAge()+"性别:"+mUser.getSex()+"住址"+mUser.getAddress(), Toast.LENGTH_SHORT).show();                }            });        }    }    private class UserAdapter extends RecyclerView.Adapter<UserHolder> {//适配器，注意继承自RecyclerView.Adapter且内容为UserHolder @Override        public UserHolder onCreateViewHolder(ViewGroup viewGroup, int i) {            LayoutInflater inflater = LayoutInflater.from(getActivity());            return new UserHolder(inflater, viewGroup);        }        @Override        public void onBindViewHolder(UserHolder soundHolder, int i) {//为每一个项目绑定对应的信息，对应每一个项目，参数UserHolder即为用于显示的每一个项目 User user = mUserList.get(i);            soundHolder.mUser=user;            soundHolder.mButton.setText(user.getName());        }        @Override        public int getItemCount() {//在RecycleView中显示的个数 return mUserList.size();        }    }}

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安卓中RecyclerView的使用

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