在ConstraintLayout中使用反向布局的方法如下:
public class MyAdapter extends RecyclerView.Adapter {
private List mData;
public MyAdapter(List data) {
mData = data;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
String item = mData.get(position);
holder.textView.setText(item);
}
@Override
public int getItemCount() {
return mData.size();
}
static class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
ViewHolder(@NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.textView);
}
}
}
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private MyAdapter mAdapter;
private List mData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.recyclerView);
mData = new ArrayList<>();
// 添加数据到列表
mData.add("Item 1");
mData.add("Item 2");
mData.add("Item 3");
mData.add("Item 4");
mData.add("Item 5");
mAdapter = new MyAdapter(mData);
mRecyclerView.setAdapter(mAdapter);
}
}
这样,你就可以在ConstraintLayout中使用反向布局来显示RecyclerView的项。