java - 如何将 StickyHeaders 添加到 recyclerView？

Question

我目前正在以初学者的身份学习 Android Studio，所以如果我问一个对专业人士来说似乎很容易的问题，请原谅我。将 StickyHeader 添加到 recyclerView 的正确方法是什么？我正在尝试开发一个示例模板，该模板将有大约 25 行，但项目应分组在 (5) 不同的stickyHeaders 下。这就是问题所在。关于如何实现这一点没有明确的指示，有点令人困惑。

目前，总共有 (5) 个与代码相关联的文件，它们是：(1)Adapter.java，(2) Item.java (3)MainActivity.java，(4) activity_main.xml，最后是 (5)item.xml . 我不确定如何完成这个stickyHeader 编码。

(1) 这里是 Adapter.java 文件：

public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
    private ArrayList<ExampleItem> mExampleList;

    public static class ExampleViewHolder extends RecyclerView.ViewHolder {
        public ImageView mImageView;
        public TextView mTextView1;
        public TextView mTextView2;

        public ExampleViewHolder(View itemView) {
            super(itemView);
            mImageView = itemView.findViewById(R.id.imageView);
            mTextView1 = itemView.findViewById(R.id.textView);
            mTextView2 = itemView.findViewById(R.id.textView2);
        }
    }

    public ExampleAdapter(ArrayList<ExampleItem> exampleList) {
        mExampleList = exampleList;
    }

    @Override
    public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item, parent, false);
        ExampleViewHolder evh = new ExampleViewHolder(v);
        return evh;
    }

    @Override
    public void onBindViewHolder(ExampleViewHolder holder, int position) {
        ExampleItem currentItem = mExampleList.get(position);

        holder.mImageView.setImageResource(currentItem.getImageResource());
        holder.mTextView1.setText(currentItem.getText1());
        holder.mTextView2.setText(currentItem.getText2());
    }

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

(2) 这里是 item.java 文件：

public class ExampleItem {
    private int mImageResource;
    private String mText1;
    private String mText2;

    public ExampleItem(int imageResource, String text1, String text2) {
        mImageResource = imageResource;
        mText1 = text1;
        mText2 = text2;
    }

    public int getImageResource() {
        return mImageResource;
    }

    public String getText1() {
        return mText1;
    }

    public String getText2() {
        return mText2;
    }
}

(3) 这里是 MainActivity.java 文件：

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

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

        ArrayList<ExampleItem> exampleList = new ArrayList<>();
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 1", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 2", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 3", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 4", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 5", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 6", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 7", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 8", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 9", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 10", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 11", "SubTitle"));
        exampleList.add(new ExampleItem(R.drawable.ic_android, "Title 12", "SubTitle"));

        mRecyclerView = findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        mAdapter = new ExampleAdapter(exampleList);

        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setAdapter(mAdapter);
    }
}

我想在几个主题之间有一个stickyHeader，但不知道如何实现stickyHeader 代码。每个人都说这很混乱。

标签： javaandroidandroid-recyclerview