本文介绍了RecyclerView不刷新的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在我的应用程序中,我从Web服务器接收到一些数据.此数据将发送到 RecyclerView
.首先,所有数据均显示良好.但是,当我尝试刷新它时,不再显示数据.数据来自Web服务(已使用Logcat验证).
In my application I receive some data from a web server. This data is sent to a RecyclerView
. Firstly, all data is displayed fine. However, when I try to refresh it, the data no-longer shows. The data arrives from the web service (as verified using Logcat).
ArrayList<FoodItem> allFood = response.body();
if(foodAdapter != null) {
foodAdapter.swap(allFood);
} else {
foodAdapter = new FoodAdapter(FoodViewForCustomerActivity.this, allFood);
}
photoCollectionView.setAdapter(foodAdapter);
我的 RecyclerView
适配器
public class FoodAdapter extends RecyclerView.Adapter<FoodAdapter.ViewHolder> {
Context mContext;
ArrayList<FoodItem> foodItems;
public FoodAdapter(Context context, ArrayList<FoodItem> foodItems) {
this.mContext = context;
this.foodItems = foodItems;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_item_row, parent, false);
return new ViewHolder(view);
}
public void swap(ArrayList<FoodItem> newFoods) {
foodItems.clear();
foodItems.addAll(newFoods);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
notifyDataSetChanged();
}
}, 500);
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
FoodItem foodItem = foodItems.get(position);
String stringPicture = foodItem.getPhoto();
byte[] decodedPictureStringArray = Base64.decode(stringPicture, Base64.DEFAULT);
Bitmap bitmapPhoto = BitmapFactory.decodeByteArray(decodedPictureStringArray, 0, decodedPictureStringArray.length);
Uri photoUri = getImageUri(mContext, bitmapPhoto);
Picasso.with(mContext).load(photoUri).resize(300, 300)
.centerCrop().into(holder.foodImage);
holder.foodItemNameText.setText(foodItem.getFoodItemName());
holder.foodPriceText.setText(foodItem.getUnitPrice() + " / " + foodItem.getUnitType());
}
public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 10, bytes);
String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
@Override
public int getItemCount() {
return foodItems.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ImageView foodImage;
public TextView foodItemNameText;
public TextView foodPriceText;
public ViewHolder(View itemView) {
super(itemView);
foodImage = (ImageView) itemView.findViewById(R.id.foodPhoto);
foodItemNameText = (TextView) itemView.findViewById(R.id.foodItemNameText);
foodPriceText = (TextView) itemView.findViewById(R.id.foodPriceText);
}
}
}
包含我的工具栏
和 RecyclerView
的 RelativeLayout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".FoodViewForCustomerActivity">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"
/>
<android.support.v7.widget.RecyclerView
android:layout_below="@id/toolbar"
android:id="@+id/photoCollectionView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f8f8f8"
android:divider="@null"
android:listSelector="@android:color/transparent"/>
</RelativeLayout>
推荐答案
很抱歉,回答了我自己的问题.我通过遵循此处提供的解决方案解决了我的问题.我的问题的主要原因是RecyclerView在调用时没有调用onCreateViewHolder或onBindView.我正在尝试刷新它.
Sorry, for answering my own question. I solved my question by following solution provided here.Main cause of my problem was that RecyclerView was not calling onCreateViewHolder or onBindView, when i was trying to refresh it.
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