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我试图从recyclerview中获取图像字符串，该图像字符串已被填充，以便我可以在另一个活动的imageview上显示图像。在这里，我用jsoup得到图片的路径（URL）：从Recyclerview的点击项显示图像
org.jsoup.nodes.Document document = Jsoup.connect(URL).get();
for(Element e : document.select("img[src]"))
{
Elements imgScr = e.select("img[src]");
String elements = imgScr.attr("src");
String text = imgScr.attr("alt");
String desc = imgScr.attr("title");
arrayList.add(new FeedItem(text, elements, desc));
}
到elements变量，然后将其存储到ArrayList中。我想获取图像的路径（url）（存储在elements），以便我可以在另一个活动中显示该图像。我试图用这个方法来检索arrayList该URL：
public String getImageUrl(int pos)
{
return arrayList.get(pos).getThumb();
}
但IndexOutOfBound抛出异常，说指数（POS）是无效的和arrayList大小为0。我不知道为什么是说这个列表的大小为0，而Recyclerview被挖掘并显示我使用jsoup解析的数据。请帮帮我，我坚持了三天。
好了完整的代码是在这里： 这主要活动足见recyclerview
public class RestaurantsAndCafesActivity extends Activity {
public static final String URL = "http://192.168.8.102:80/jay.html";
private RecyclerView mRecyclerView;
private RCRecyclerAdapter adapter;
public String imgUrl;
//public List<FeedItem> feedItemList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reyclerview_layout);
/* Initialize RecyclerView */
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
//parseResult();
new getDataAsyncTask().execute();
final GestureDetector mGestureDetector = new GestureDetector(RestaurantsAndCafesActivity.this, new GestureDetector.SimpleOnGestureListener() {
@Override public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
View child = recyclerView.findChildViewUnder(motionEvent.getX(),motionEvent.getY());
if(child!=null && mGestureDetector.onTouchEvent(motionEvent)){
Toast.makeText(RestaurantsAndCafesActivity.this,"Clicked Number "+recyclerView.getChildPosition(child), Toast.LENGTH_SHORT).show();
imgUrl = new getDataAsyncTask().getImageUrl(recyclerView.getChildPosition(child));
Intent intent = new Intent(RestaurantsAndCafesActivity.this, GetReviewActivity.class);
intent.putExtra("Imgurl" ,imgUrl);
startActivity(intent);
return true;
}
return false;
}
@Override
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
}
});
}
public class getDataAsyncTask extends AsyncTask<Void,Void,Void>{
ArrayList<FeedItem> arrayList = new ArrayList<>();
public String getImageUrl(int pos)
{
return arrayList.get(pos).getThumb();
}
@Override
protected Void doInBackground(Void... params) {
try {
org.jsoup.nodes.Document document = Jsoup.connect(URL).get();
for(Element e : document.select("img[src]"))
{
Elements imgScr = e.select("img[src]");
String elements = imgScr.attr("src");
String text = imgScr.attr("alt");
String desc = imgScr.attr("title");
arrayList.add(new FeedItem(text, elements, desc));
}
}
catch(IOException e)
{
e.printStackTrace();
}
return null;
}
ProgressDialog progressDialog;
@Override
protected void onPreExecute()
{
progressDialog = ProgressDialog.show(RestaurantsAndCafesActivity.this,"Loading","Please Wait",true,false);
}
@Override
protected void onPostExecute(Void aVoid) {
progressDialog.dismiss();
adapter = new RCRecyclerAdapter(getApplicationContext(),arrayList);
mRecyclerView.setAdapter(adapter);
}
}
}
这些适配器，viewholder和数据类：
public class RCRecyclerAdapter extends RecyclerView.Adapter<RCRecyclerViewListRowHolder> {
private List<FeedItem> feedItemList;
private Context mContext;
public RCRecyclerAdapter(Context context, List<FeedItem> feedItemList) {
this.feedItemList = feedItemList;
this.mContext = context;
}
@Override
public RCRecyclerViewListRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.restaurants_cafes_layout_card, null);
RCRecyclerViewListRowHolder mh = new RCRecyclerViewListRowHolder(v);
return mh;
}
@Override
public void onBindViewHolder(RCRecyclerViewListRowHolder RCRecyclerViewListRowHolder, int i){
FeedItem feedItem = feedItemList.get(i);
Picasso.with(mContext).load(feedItem.getThumb()
).error(R.drawable.placeholder).placeholder(R.drawable.placeholder).into(RCRecyclerViewListRowHolder.thumbnail);
RCRecyclerViewListRowHolder.title.setText(feedItemList.get(i).title);
RCRecyclerViewListRowHolder.desc.setText(feedItemList.get(i).desc);
}
@Override
public int getItemCount() {
return (null != feedItemList ? feedItemList.size() : 0);
}
}
viewholder：
public class RCRecyclerViewListRowHolder extends RecyclerView.ViewHolder {
public ImageView thumbnail;
public TextView title;
public TextView desc;
//Context context;
public RCRecyclerViewListRowHolder(View view) {
super(view);
this.thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
this.title = (TextView) view.findViewById(R.id.title);
this.desc = (TextView) view.findViewById(R.id.desc);
}
}
数据：
public class FeedItem {
public String title;
public String thumb;
public String desc;
public FeedItem(String title, String thumb , String desc) {
this.title = title;
this.thumb = thumb;
this.desc = desc;
}
public String getThumb() {
return thumb;
}
}
您发布的代码不足以发现该错误。请参阅[最小化，完整和可验证]（http://stackoverflow.com/help/mcve） – maciekjanusz
@invariant好吧，我编辑了帖子，添加了recyclerview的完整代码。请检查一下。 –
好吧，我发布了答案 – maciekjanusz