来自 Recyclerview 的点击项目的图像

Question

我是 Android 应用程序开发的新手。我正在尝试在另一个 Activity 中显示用户单击的 Recyclerview 项目中的图像和文本。我收到无法访问的语句错误。请帮帮我！

这是我获取图像的代码：

imgUrl = new getDataAsyncTask().getImageUrl(recyclerView.getChildPosition(child));

和完整的 Activity 代码：

public class RestaurantsAndCafesActivity extends Activity {

public static final String URL = "http://192.168.8.101:80/jay.html";

private RecyclerView mRecyclerView;
private RCRecyclerAdapter adapter;
public String imgUrl;

@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();
                return true;
                imgUrl = new getDataAsyncTask().getImageUrl(recyclerView.getChildPosition(child));
            }
            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).thumb;
    }

    @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);
    }
}

}

我只想获取图像 url，以便我可以通过 Intent.putExtra 方法将其发送到另一个 Activity。请告诉我我哪里出错了，或者还有其他方法可以实现我想要实现的目标吗？

Answer 1

在你的onInterceptTouchEvent中

imgUrl = new getDataAsyncTask().getImageUrl(recyclerView.getChildPosition(child)); 需要在 return true 之前。它在 return true; 之后声明，这使得该语句无法访问。

来自 Recyclerview 的点击项目的图像

Image from clicked item of Recyclerview

android

android-recyclerview