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>
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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);
}
}
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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);
}
}
}
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