android - 相对布局中的多个 ListView ？

Question

我在为我的提要使用 ListView 时遇到了问题。我在同一个 Activity 中将两个源放在彼此之上，一个流式传输新闻，现在我将事件添加到底部，但它无法识别第二个 ListView 的 android id？？？

<ListView
        android:id="@android:id/list"
        android:background="@color/red"
        android:layout_toRightOf="@+id/map"
        android:layout_width="260dp"
         android:layout_marginTop="5dp"
        android:layout_marginLeft="10dp"
        android:layout_height="413dp" />

第一个 ListView 完美运行。

<ListView  
        android:id="@+id/android:list1"
        android:background="@color/blue"
        android:layout_toRightOf="@+id/button3"
        android:layout_width="260dp"
        android:layout_marginTop="430dp"
        android:layout_marginLeft="6dp"
        android:layout_height="390dp" />

这个 ListView 不起作用？？我知道关于 android id 的信息吗？我试过几种变体？

android:id="@+id/android:list1"
android:id="@android:id/list1"
android:id="@+id/list1"

需要任何帮助吗？我花了几个小时浏览代码，现在我知道它的 id 就是问题所在，因为如果我交换 listview Activity ，那么第二个 listview 可以工作吗？？

private class MyTask extends AsyncTask<Void, Void, Void>{

            @Override
            protected Void doInBackground(Void... arg0) {
                try {
                    URL rssUrl = new URL("http:/news.rss");
                    ///URL rssUrl1 = new URL("http://events.rss");

                    SAXParserFactory mySAXParserFactory = SAXParserFactory.newInstance();
                    SAXParser mySAXParser = mySAXParserFactory.newSAXParser();
                    XMLReader myXMLReader = mySAXParser.getXMLReader();
                    RSSHandler myRSSHandler = new RSSHandler();
                    myXMLReader.setContentHandler(myRSSHandler);

                    InputSource myInputSource = new InputSource(rssUrl.openStream());
                    myXMLReader.parse(myInputSource);
                    ///InputSource myInputSource1 = new InputSource(rssUrl1.openStream());
                    ///myXMLReader.parse(myInputSource1);

                    myRssFeed = myRSSHandler.getFeed(); 
                    ///myRssFeed1 = myRSSHandler.getFeed(); 

                } catch (MalformedURLException e) {
                    e.printStackTrace();    
                } catch (ParserConfigurationException e) {
                    e.printStackTrace();    
                } catch (SAXException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();    
                }

                return null;
            }

            @Override
            protected void onPostExecute(Void result) {
                if (myRssFeed!=null || myRssFeed1!=null)
                {
                    TextView feedupdate = (TextView)findViewById(R.id.feedupdate);
                    feedupdate.setText(myRssFeed.getupdate());
                    //TextView feedupdate1 = (TextView)findViewById(R.id.feedupdate1);
                    ///feedupdate1.setText(myRssFeed1.getupdate());

                    ArrayAdapter<RSSItem> adapter =
                            new ArrayAdapter<RSSItem>(getApplicationContext(),
                                    android.R.layout.simple_list_item_1,myRssFeed.getList());
                    setListAdapter(adapter);
                    ///ArrayAdapter<RSSItem> adapter1 =
                            //new ArrayAdapter<RSSItem>(getApplicationContext(),
                                    //android.R.layout.simple_list_item_1,myRssFeed1.getList());
                    //setListAdapter(adapter1);

                }else{

                    TextView textEmpty = (TextView)findViewById(android.R.id.empty);
                    textEmpty.setText("No Feed Found");
                }

                super.onPostExecute(result);
            }   

        }   
        @Override
        protected void onListItemClick(ListView l, View v, int position, long id) {

            Uri feedUri = Uri.parse(myRssFeed.getItem(position).getLink());
            Uri feedUri1 = Uri.parse(myRssFeed1.getItem(position).getLink());
            Intent myIntent = new Intent(Intent.ACTION_VIEW, feedUri);
            Intent myIntent1 = new Intent(Intent.ACTION_VIEW, feedUri1);
            startActivity(myIntent);
            startActivity(myIntent1);
        }
    }

---

public class HomeActivity extends ListActivity {
          static final LatLng TULLAMORE = new LatLng(53.28000, -7.49000);
          static final LatLng MRA = new LatLng(53.274823, -7.492655);
          private GoogleMap map;
          private RSSFeed myRssFeed = null;
          private RSSFeed myRssFeed1 = null;
          @Override


          protected void onCreate(Bundle savedInstanceState) {
            requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);  
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main); 
            getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);
            new MyTask().execute();


            map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                .getMap();
            Marker tullamore = map.addMarker(new MarkerOptions().position(TULLAMORE)
                .title("Tullamore"));
            Marker mra = map.addMarker(new MarkerOptions()
                .position(MRA)
                .title("-")
                .snippet("Hey :-)")
                .icon(BitmapDescriptorFactory
                    .fromResource(R.drawable.ic_launcher)));

            map.moveCamera(CameraUpdateFactory.newLatLngZoom(TULLAMORE, 70));
            // Zoom in, animating the camera.
            map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
            map.setMyLocationEnabled(true);
            map.getUiSettings().setZoomControlsEnabled(true);
            map.getUiSettings().setMyLocationButtonEnabled(true);
            map.setTrafficEnabled(true);
            Button button1 = (Button) findViewById(R.id.button1);
            Button button2 = (Button) findViewById(R.id.button2);
            Button button3 = (Button) findViewById(R.id.button3);
            Button button4 = (Button) findViewById(R.id.button4);

            button2.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View arg0) {
                    //Starting a new Intent
                    Intent FavouritesScreen = new Intent(getApplicationContext(),FavouritesActivity.class); 
                    startActivity(FavouritesScreen);
                }
                });

            button4.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View arg0) {
                    //Starting a new Intent
                    Intent NearbyScreen = new Intent(getApplicationContext(), NearbyActivity.class);    
                    startActivity(NearbyScreen);
                }
                });

            button3.setOnClickListener(new View.OnClickListener() { 
            @Override
            public void onClick(View arg0) {
                //Starting a new Intent
                Intent TourismScreen = new Intent(getApplicationContext(), TourismActivity.class);  
                startActivity(TourismScreen);   
            }
            });

            button1.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View arg0) {
                    //Starting a new Intent
                    Intent MapScreen = new Intent(getApplicationContext(), MapActivity.class);  
                    startActivity(MapScreen);   
                }
                });
          }

            @Override
            public boolean onCreateOptionsMenu(Menu menu) {
              getMenuInflater().inflate(R.menu.home, menu);
              return true; 

            }
            private class MyTask extends AsyncTask<Void, Void, Void>{

                @Override
                protected Void doInBackground(Void... arg0) {
                    try {
                        URL rssUrl = new URL("http://www.midlandsireland.ie/news.rss");
                        URL rssUrl1 = new URL("http://feedity.com/midlandsireland-ie/V1pUU1VR.rss");

                        SAXParserFactory mySAXParserFactory = SAXParserFactory.newInstance();
                        SAXParser mySAXParser = mySAXParserFactory.newSAXParser();
                        XMLReader myXMLReader = mySAXParser.getXMLReader();
                        RSSHandler myRSSHandler = new RSSHandler();
                        myXMLReader.setContentHandler(myRSSHandler);

                        InputSource myInputSource = new InputSource(rssUrl.openStream());
                        myXMLReader.parse(myInputSource);
                        InputSource myInputSource1 = new InputSource(rssUrl1.openStream());
                        myXMLReader.parse(myInputSource1);

                        myRssFeed = myRSSHandler.getFeed(); 
                        myRssFeed1 = myRSSHandler.getFeed();    

                    } catch (MalformedURLException e) {
                        e.printStackTrace();    
                    } catch (ParserConfigurationException e) {
                        e.printStackTrace();    
                    } catch (SAXException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();    
                    }

                    return null;
                }

                @Override
                protected void onPostExecute(Void result) {
                    if (myRssFeed!=null || myRssFeed1!=null)
                    {
                        TextView feedupdate = (TextView)findViewById(R.id.feedupdate);
                        feedupdate.setText(myRssFeed.getupdate());
                        TextView feedupdate1 = (TextView)findViewById(R.id.feedupdate1);
                        feedupdate1.setText(myRssFeed1.getupdate());
                        ListView newsfeed = (ListView)findViewById(android.R.id.list);
                        ListView eventsfeed = (ListView)findViewById(R.id.list1);

                        ArrayAdapter<RSSItem> adapter =
                                new ArrayAdapter<RSSItem>(getApplicationContext(),
                                        android.R.layout.simple_list_item_1,myRssFeed.getList());                   
                        setListAdapter(adapter);

                    }else{

                        TextView textEmpty = (TextView)findViewById(android.R.id.empty);
                        textEmpty.setText("No Feed Found");
                    }

                    super.onPostExecute(result);
                }   

            }   
            @Override
            protected void onListItemClick(ListView l, View v, int position, long id) {     
                Uri feedUri = Uri.parse(myRssFeed.getItem(position).getLink());
                Intent myIntent = new Intent(Intent.ACTION_VIEW, feedUri);
                startActivity(myIntent);
            }
        }

Answer 1

这个ID:

android:id="@+id/android:list1"
android:id="@android:id/list1"

SDK 中不存在。 id android:id="@+id/list1" 是有效的，如果你在 Activity 中使用 findViewById(R.id.list1) >(其内容是两个 ListViews 的布局)您会找到 ListView。

此外，正如您的代码所暗示的那样，您似乎正试图将两个 ListViews 作为一个来操作，这显然是错误的。在 onPostExecute() 方法中，您将使用 setListAdapter() 方法为 ID 为 android 的 ListView 设置适配器.R.id.list 和其他 ListView 你会做:

ListView second = (ListView) findViewById(R.id.list1);
// set the adapter for this ListView

关于这段代码:

        Uri feedUri = Uri.parse(myRssFeed.getItem(position).getLink());
        Uri feedUri1 = Uri.parse(myRssFeed1.getItem(position).getLink());
        Intent myIntent = new Intent(Intent.ACTION_VIEW, feedUri);
        Intent myIntent1 = new Intent(Intent.ACTION_VIEW, feedUri1);
        startActivity(myIntent);
        startActivity(myIntent1);

开始两个(？!？!) Activity (做什么？!)你想做什么？

编辑:

try {
                URL rssUrl = new URL("http:/news.rss");
                SAXParserFactory mySAXParserFactory = SAXParserFactory.newInstance();
                SAXParser mySAXParser = mySAXParserFactory.newSAXParser();
                XMLReader myXMLReader = mySAXParser.getXMLReader();
                RSSHandler myRSSHandler = new RSSHandler();
                myXMLReader.setContentHandler(myRSSHandler);
                InputSource myInputSource = new InputSource(rssUrl.openStream());
                myXMLReader.parse(myInputSource);
                myRssFeed = myRSSHandler.getFeed(); 

                RSSHandler myRSSHandler1 = new RSSHandler();
                myXMLReader.setContentHandler(myRSSHandler1);

                URL rssUrl1 = new URL("http://events.rss");
                InputSource myInputSource1 = new InputSource(rssUrl1.openStream());
                myXMLReader.parse(myInputSource1);
                myRssFeed1 = myRSSHandler1.getFeed(); 
            } catch (MalformedURLException e) {
                e.printStackTrace();    
            } catch (ParserConfigurationException e) {
                e.printStackTrace();    
            } catch (SAXException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();    
            }

 @Override
        protected void onPostExecute(Void result) {
            if (myRssFeed!=null && myRssFeed1!=null) {
                ArrayAdapter<RSSItem> adapter =
                        new ArrayAdapter<RSSItem>(getApplicationContext(), android.R.layout.simple_list_item_1, myRssFeed.getList());
                setListAdapter(adapter);
                ArrayAdapter<RSSItem> adapter1 =
                       new ArrayAdapter<RSSItem>(getApplicationContext(),            android.R.layout.simple_list_item_1,myRssFeed1.getList());
                ListView lv = (ListView) findViewById(R.id.list1);
                lv.setAdapter(adapter1);
            } else {
             setListAdapter(new ArrayAdapter<RSSItem>(getApplicationContext(),            android.R.layout.simple_list_item_1, new ArrayList<RSSItem>()););
             ArrayAdapter<RSSItem> adapterEmpty1 = 
                       new ArrayAdapter<RSSItem>(getApplicationContext(),            android.R.layout.simple_list_item_1, new ArrayList<RSSItem>());
                ListView lv = (ListView) findViewById(R.id.list1);
                lv.setAdapter(adapterEmpty1);
            }   

        }