一个使用RecyclerView的简单例子

RecyclerView可以用来替代老的ListView, 并提供了更强大的功能和可定制性。本文先简单的演示其基本用法,对比 Android 控件演示 - ListView

Activity 的界面文件:

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

行描述文件: item.xml

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<?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="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>

主程序文件

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public class MainActivity extends AppCompatActivity {

@BindView(R.id.recyclerView)
protected RecyclerView recyclerView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

List<String> list = new ArrayList<>();
list.add("张三");
list.add("李四");
list.add("王二麻子");

recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(linearLayoutManager);

MyAdapter myAdapter = new MyAdapter(list);
recyclerView.setAdapter(myAdapter);
}
}

对应的 Adapter:

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public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

private List<String> nameList;

public MyAdapter(List<String> list) {
nameList = list;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.item, parent, false);
MyViewHolder myViewHolder = new MyViewHolder(view);
return myViewHolder;
}

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, final int position) {
final String name = nameList.get(position);
holder.textView.setText(name);

holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
remove(position);
}
});
}

@Override
public int getItemCount() {
if (nameList==null) {
return 0;
} else {
return nameList.size();
}
}

private void remove(int position) {
nameList.remove(position);
notifyItemRemoved(position);
}

public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView textView;

public MyViewHolder(View itemVieww) {
super(itemVieww);
textView = itemView.findViewById(R.id.textView);
}
}
}

本文标题:一个使用RecyclerView的简单例子

文章作者:梅老师

发布时间:2019年09月26日 - 07:09

最后更新:2020年09月16日 - 08:09

原始链接:https://www.mls-tech.info/app/android/android-widget-recyclerview-1/

许可协议: 署名-非商业性使用-禁止演绎 4.0 国际 转载请保留原文链接及作者。