recyclerview 数据在滚动时发生变化（不重复），动态文本视图在滚动时翻倍

Question

滚动时我的 recyclerview 数据发生了变化 down/up。当我滚动布局时，它每次都会出现新值我已经添加了这两种方法，也添加了 false 可回收。但是，没有成功。

这是我的适配器的样子。

public class DetailListAdapter extends RecyclerView.Adapter<DetailListAdapter.ViewHolder> {

Context context;
ArrayList<KcResponse> kcList;
String birthDate; }

 @NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_client_detail, parent, false);
    DetailListAdapter.ViewHolder vh = new DetailListAdapter.ViewHolder(v);
    return vh;
}


@Override
public void onBindViewHolder(@NonNull DetailListAdapter.ViewHolder holder, int position) {

    holder.setIsRecyclable(false);
    holder.periodTv.setText(kcList.get(position).getPeriod());

  TextView textView1 = new TextView(context);
    textView1.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));

    for (int i = 0; i < arr.length; i++) {
        String line = arr[i];
        SpannableString ss = new SpannableString(line);
        ss.setSpan(new BulletSpan(bulletGap), 0, line.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        ssb.append(ss);

        //avoid last "\n"
        if (i + 1 < arr.length)
            ssb.append("\n");

    }

    textView1.setTextSize(12);
    textView1.setTextColor(ContextCompat.getColor(context, R.color.black_text));
    textView1.setPadding(15, 0, 0, 0);
    textView1.setText(ssb); // bullet text
    holder.effectsLl.addView(textView1);

   holder.periodTv.setBackgroundColor(Color.parseColor(kcList.get(position).getColor()));}

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

Answer 1

您的 recylcerview 中没有超过一种类型的视图，因此可以肯定的是，您不需要覆盖 getItemViewType(int position)。

另外方法getItemId(int position)的用法也不正确。该方法用于获取位置处项目的稳定ID。

Answer 2

您共享的适配器代码不足以识别问题。所以我分享了一个非常简单的 recyclerview 及其适配器代码，只是尝试使用它。希望对你有所帮助。

编码愉快...

    public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private DataAdapter adapter;

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

        recyclerView = findViewById(R.id.recyclerView);
        adapter = new DataAdapter();

        recyclerView.setAdapter(adapter);
        recyclerView.addItemDecoration(new DividerItemDecoration(this));
    }
}

适配器class代码

    public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {

    public DataAdapter() {
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
        View listItem = layoutInflater.inflate(R.layout.adapter_layout, parent, false);
        ViewHolder viewHolder = new ViewHolder(listItem);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {

        holder.textView.setText("TextView1");
        holder.textView.setText("TextView2");
    }


    @Override
    public int getItemCount() {
        return 20;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView imageView;
        public TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            this.imageView = itemView.findViewById(R.id.textView1);
            this.textView = (TextView) itemView.findViewById(R.id.textView2);
        }
    }
}

activity_main.xml

<?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"
        android:background="#f1f1f1"
        tools:context=".MainActivity">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:layout_constraintTop_toTopOf="parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>

adapter_layout.xml

    <?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="wrap_content"
    android:padding="4dp"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="TextView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView1" />

</androidx.constraintlayout.widget.ConstraintLayout>

Answer 3

将此覆盖方法添加到您的自定义适配器

 @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

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