Android

Question

我有一个 RecyclerView，我通过检测 RecyclerView 的末尾从我的数据库中十个十个地加载项目。我的问题：加载项目后，当我滚动时，RecyclerView 在 1-2 秒内冻结。我认为问题来自每个项目中的 ImageView。每次加载后，最后一个列表会像这样添加到适配器中：arrayAdapter.list.addAll(questions); 然后是 arrayAdapter.notifyDataSetChanged();

我的适配器：

@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
    final Question question = list.get(position);
    holder.tvOwner.setText("Question posée par " + question.ownerUsername);
    holder.tvQuestion.setText(question.question);

    if (question.image != null) {
        holder.questionImage.setImageBitmap(question.image);
        holder.questionImage.setVisibility(View.VISIBLE);
        holder.questionImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                NavigationMenu nav = (NavigationMenu) context;
                nav.showPictureFullScreen(question.image);
            }
        });
    } else {
        holder.questionImage.setImageBitmap(null);
        holder.questionImage.setVisibility(View.GONE);
    }

Answer 1

感谢 Pavan

public class SetImageBitmap extends AsyncTask<Void, Void, Bitmap> {
    Question q;
    ImageView iv;

    public SetImageBitmap(Question q, ImageView iv) {
        this.q = q;
        this.iv = iv;
    }

    @Override
    protected Bitmap doInBackground(Void... params) {
        return q.image;
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        iv.setImageBitmap(bitmap);
        iv.setVisibility(View.VISIBLE);
    }
}

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