芯片组中的多行芯片

Question

我正在从我的API中获取一个清单，例如德国、英国、法国、意大利等25个国家的标签.我想要2行，每行10 chips，如果下次我得到30个标签，我想要3行10 chips等等.

到目前为止，我还没有找到任何允许我这样做的东西。我快速地看了一下Flexbox-Layout，但是它似乎不符合我的需要，我现在有下面的代码，但是我正在考虑用一个Recyclerview来执行这样的逻辑

片段

viewModel.videoSelected.observe(viewLifecycleOwner, object : Observer<VideoPage> {
            override fun onChanged(videoPage: VideoPage?) {
                videoPage?.tags ?: return
                val chipGroup = binding.chipGroup
                val chipGroupInflater = LayoutInflater.from(chipGroup.context)
                val children = videoPage.tags.map { tagName ->
                    val chip = chipGroupInflater.inflate(R.layout.chip_video_tag, chipGroup, false) as Chip
                    chip.text = tagName
                    chip.tag = tagName
                    chip.setOnClickListener {
                        Toast.makeText(context, tagName, Toast.LENGTH_SHORT).show()
                    }

                    chip
                }

                for (chip in children) {
                    chipGroup.addView(chip)
                }
            }
        })

结果是一条线上的25片芯片。我怎样才能使它在多个线上被分割？

Answer 1

我还用BindingAdapter以一种更简单的方式完成了

 <androidx.recyclerview.widget.RecyclerView
                    app:listVideoTagChip="@{viewModel.videoSelected.tags}"
                    android:id="@+id/rv_video_chips"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    app:layoutManager="androidx.recyclerview.widget.StaggeredGridLayoutManager"
                    android:orientation="horizontal"
                    tools:listitem="@layout/chip_video_tag"/>

private const val TAG_PER_ROW = 10

@BindingAdapter("listVideoTagChip")
fun RecyclerView.bindRecyclerView(data: List<String>?) {
    val adapter: VideoTagAdapter = this.adapter as VideoTagAdapter
    (layoutManager as StaggeredGridLayoutManager).spanCount =
        data?.size?.let {
            ceil(it.toDouble().div(TAG_PER_ROW)).toInt()
        } ?: 1
    adapter.submitList(data)
}

Answer 2

如注释所示，您可以在芯片11、21等上使用Flexbox LayoutManager和layout_wrapBefore标志。

或者，如果您重新格式化数据，也可以使用标准的回收视图。

要使用标准回收视图，您需要将数据安排在2D数据结构中，这可以是ArrayList的ArrayList，也可以是数组或一组POJO类。

在外部的Arraylist中，行和内部的Arraylist将在行中显示项目。

因此，RecyclerView项只是生成行的水平线性布局，您可以从内部ArrayList向行中添加芯片

使用生成的2D结构的示例

MainActivity

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private RAdapter adapter;
    private ArrayList<ArrayList<String>> rowsArrayList;

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

        recyclerView = (RecyclerView) findViewById(R.id.recycler);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);

        rowsArrayList = new ArrayList<>();
        for (int i = 1; i <= 3; i++) {
            ArrayList<String> row = new ArrayList<>();
            for (int j = 1; j <= 10; j++) {
                row.add(String.valueOf(j));
            }
            rowsArrayList.add(row);
        }

        adapter = new RAdapter(this, rowsArrayList);
        recyclerView.setAdapter(adapter);
    }
}

RAdapter

public class RAdapter extends RecyclerView.Adapter<RAdapter.RHolder>{

    class RHolder extends RecyclerView.ViewHolder {
        private LinearLayout line;

        public RHolder(View itemView) {
            super(itemView);
            line = itemView.findViewById(R.id.line);
        }
    }

    private Context context;
    private ArrayList<ArrayList<String>> rowsArrayList;

    public RAdapter(Context context, ArrayList<ArrayList<String>> rowsArrayList) {
        this.context = context;
        this.rowsArrayList = rowsArrayList;
    }

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

    @Override
    public void onBindViewHolder(RHolder holder, int position) {
        // Because we might be recycling the LinearLayout that might have had chips added to it already
        holder.line.removeAllViews();
        ArrayList<String> row = rowsArrayList.get(position);
        for (String text: row) {
            Chip chip = new Chip(context);
            chip.setText(text);
            holder.line.addView(chip);
        }
    }

    @Override
    public int getItemCount() {
        return rowsArrayList.size();
    }

}

row_layout.xml

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

</LinearLayout>

这会产生

​

更新：

只要再多点数学，你就可以不用重新整理数据就能做这件事。

显示不包括整行的25个项目

MainActivity

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private RAdapter adapter;
    private ArrayList<String> itemsArrayList;

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

        recyclerView = (RecyclerView) findViewById(R.id.recycler);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);

        itemsArrayList = new ArrayList<>();
        for (int i = 1; i <= 25; i++) {
            itemsArrayList.add(String.valueOf(i));
        }

        adapter = new RAdapter(this, itemsArrayList);
        recyclerView.setAdapter(adapter);
    }
}

RAdapter

public class RAdapter extends RecyclerView.Adapter<RAdapter.RHolder>{

    class RHolder extends RecyclerView.ViewHolder {
        private LinearLayout line;

        public RHolder(View itemView) {
            super(itemView);
            line = itemView.findViewById(R.id.line);
        }
    }

    private Context context;
    private ArrayList<String> itemsArrayList;
    private int itemsPerRow = 10;

    public RAdapter(Context context, ArrayList<String> itemsArrayList) {
        this.context = context;
        this.itemsArrayList = itemsArrayList;
    }

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

    @Override
    public void onBindViewHolder(RHolder holder, int position) {
        // Because we might be recycling the LinearLayout that might have had chips added to it already
        holder.line.removeAllViews();
        int adjustedPosition = position + 1;
        int rangeEnd = Math.min(itemsArrayList.size(), adjustedPosition * itemsPerRow);
        int rangeStart = Math.max((position * itemsPerRow) + 1, rangeEnd - itemsPerRow);
        for (int i = rangeStart; i <= rangeEnd; i++) {
            int arrayPositionAdjusted = i - 1;
            Chip chip = new Chip(context);
            chip.setText(itemsArrayList.get(arrayPositionAdjusted));
            holder.line.addView(chip);
        }
    }

    @Override
    public int getItemCount() {
        return return (int) Math.ceil(itemsArrayList.size()/ (double) itemsPerRow);
    }

}

产

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