在做項目時,使用了RecylerView取代了ListView這個傳統的列表控件,現在總結一下它的基本用法,方便以後回顧。效果圖如下:
先來看一下工程結構:
使用步驟:
- 添加依賴,因爲是v7包下的(compile ‘com.android.support:recyclerview-v7:25.0.0’)
- 準備數據源,以便填充數據
- 佈局
- 查找控件
- 準備RecylerView的子條目佈局
- 複寫適配器
- 設置適配器
爲了存儲數據方便在這裏建了一個人類,擁有三個屬性,name,age,picture。
public class PersonBean {
public String name;
public int age;
public int picture;
}
添加多個人:
List<PersonBean> datas = new ArrayList<>();
for (int i = 0; i < 20; i++) {
PersonBean personBean = new PersonBean();
personBean.name = "蒼老師" + i;
personBean.age = 20 + i;
personBean.picture = R.mipmap.gril;
datas.add(personBean);
}`
將RecylerView寫入佈局(activity_main.xml)
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
查找控件,老套路
//基本用法
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
//添加布局管理器,還有其它幾種
recyclerView.setLayoutManager(new LinearLayoutManager(this));
準備RecylerView的子條目佈局(item_recylerview)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="120dp">
<ImageView
android:id="@+id/iv_user_pic"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_margin="20dp"
android:src="@mipmap/gril" />
<TextView
android:id="@+id/tv_user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_margin="20dp"
android:text="姓名" />
<TextView
android:id="@+id/tv_user_age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_margin="20dp"
android:text="年齡" />
</RelativeLayout>
重寫適配器,同時要先準備好ViewHolder
private class MyRecylerAdapter extends Adapter<MyRecylerAdapter.MyRecylerViewHolder> {
@Override
public MyRecylerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recylerview, null);
MyRecylerViewHolder holder = new MyRecylerViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(MyRecylerViewHolder holder, int position) {
PersonBean personBean = datas.get(position);
holder.tv_user_name.setText(personBean.name);
holder.tv_user_age.setText(String.valueOf(personBean.age));
holder.iv_user_pic.setBackgroundResource(personBean.picture);
}
@Override
public int getItemCount() {
return datas.size();
}
//ViewHolder
class MyRecylerViewHolder extends ViewHolder {
private final ImageView iv_user_pic;
private final TextView tv_user_name, tv_user_age;
public MyRecylerViewHolder(View itemView) {
super(itemView);
iv_user_pic = (ImageView) itemView.findViewById(R.id.iv_user_pic);
tv_user_name = (TextView) itemView.findViewById(R.id.tv_user_name);
tv_user_age = (TextView) itemView.findViewById(R.id.tv_user_age);
}
}
}
設置適配器
//設置適配器
recyclerView.setAdapter(new MyRecylerAdapter());