无法使用Volley显示两个自定义ListView

时间：2015-05-22 20:25:15

标签： android json android-layout listview android-volley

我是android的初学者，我正在尝试使用Volley创建一个自定义列表，其中包含每个图像列表和文本说明。列表视图有两个活动，使用volley下载json数据，使用OnItemClickListener启动其他活动。第一个活动完成运行，当我点击另一个时，Logcat没有显示任何内容，但第二个Listview活动是空白的只有标题... 这是Logcat我不知道它是否有用。

我所有的Logcat 

05-22 16:09:32.549: V/Monotype(14980): SetAppTypeFace- try to flip, app = com.wangjian.klmeet_sightseeing
05-22 16:09:32.550: V/Monotype(14980):     Typeface getFontPathFlipFont - systemFont = default
05-22 16:09:33.378: D/Volley(14980): [1] 2.onErrorResponse: MainActivity

我的代码看起来像这样：

第一项活动 SightseeingActivity.java 

public class SightseeingActivity extends Activity {
//Log tag
private static final String TAG = SightseeingActivity.class.getSimpleName();

//Sightseeing json url
private static final String url = "http://wangjian.site90.net/json/api_klmeet_sightseeing.json";
private ProgressDialog pDialog;
private List<Sight> sightList = new ArrayList<Sight>();
private ListView listView;
private CustomListAdapter adapter;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sightseeing_activity);

    listView = (ListView) findViewById(R.id.sight_list);
    adapter = new CustomListAdapter(this, sightList);
    listView.setAdapter(adapter);

    pDialog = new ProgressDialog(this);
    // Showing progress dialog before making http request
    pDialog.setMessage("Loading...");
    pDialog.show();

    //changing action bar color
    getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#1b1b1b")));

    //Creating volley request obj
    JsonArrayRequest sightReq = new JsonArrayRequest(url,new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response){
            Log.d(TAG, response.toString());
            pDialog.dismiss();

            for (int i = 0; i < response.length(); i++){
                try{
                    JSONObject obj = response.getJSONObject(i);
                    Sight sight = new Sight();
                    sight.setTitle(obj.getString("title"));
                    sight.setThumbnailUrl(obj.getString("image"));
                    sight.setReadmore(obj.getString("readmore"));
                    sight.setPreintroduce(obj.getString("preintroduce"));
                    sight.setTag(obj.getString("tag"));

                    sightList.add(sight);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

            //notifying list adapter about data changes
            //so that it renders the list view with updated data
            adapter.notifyDataSetChanged();
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error){
            VolleyLog.d(TAG, "Error: " + error.getMessage());
        }
    });
    // Adding request to request queue
            AppController.getInstance().addToRequestQueue(sightReq);
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    Class<? extends Activity> activityToSrart = null;
                    switch (position){
                    case 0:
                        activityToSrart = MainActivity.class;
                        break;
                    case 1:
                        activityToSrart = MerdekaSquare.class;
                        break;
                    }

                    Intent i = new Intent(getApplicationContext(), activityToSrart);
                    startActivity(i);
                }

            });
    }

 }

第二项活动 MainActivity 

public class MainActivity extends Activity {
private static final String TAG = MainActivity.class.getSimpleName();
private ListView listView;
private FeedListAdapter listAdapter;
private List<FeedItem> feedItems;
private String URL_FEED = "http://wangjian.site90.net/json/api_klmeet_sightseeing_face.json";

@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listView = (ListView) findViewById(R.id.list);

    feedItems = new ArrayList<FeedItem>();

    listAdapter = new FeedListAdapter(this, feedItems);
    listView.setAdapter(listAdapter);

    // These two lines not needed,
    // just to get the look of facebook (changing background color & hiding the icon)
    getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#3b5998")));
    getActionBar().setIcon(
               new ColorDrawable(getResources().getColor(android.R.color.transparent)));

    // We first check for cached request
    Cache cache = AppController.getInstance().getRequestQueue().getCache();
    Entry entry = cache.get(URL_FEED);
    if (entry != null) {
        // fetch the data from cache
        try {
            String data = new String(entry.data, "UTF-8");
            try {
                parseJsonFeed(new JSONObject(data));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

    } else {
        // making fresh volley request and getting json
        JsonObjectRequest jsonReq = new JsonObjectRequest(Method.GET,
                URL_FEED, null, new Response.Listener<JSONObject>() {

                    @Override
                    public void onResponse(JSONObject response) {
                        VolleyLog.d(TAG, "Response: " + response.toString());
                        if (response != null) {
                            parseJsonFeed(response);
                        }
                    }
                }, new Response.ErrorListener() {

                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.d(TAG, "Error: " + error.getMessage());
                    }
                });

        // Adding request to volley request queue
        AppController.getInstance().addToRequestQueue(jsonReq);
    }

}

/**
 * Parsing json reponse and passing the data to feed view list adapter
 * */
private void parseJsonFeed(JSONObject response) {
    try {
        JSONArray feedArray = response.getJSONArray("feed");

        for (int i = 0; i < feedArray.length(); i++) {
            JSONObject feedObj = (JSONObject) feedArray.get(i);

            FeedItem item = new FeedItem();
            item.setId(feedObj.getInt("id"));
            item.setName(feedObj.getString("name"));

            // Image might be null sometimes
            String image = feedObj.isNull("image") ? null : feedObj
                    .getString("image");
            item.setImge(image);
            item.setStatus(feedObj.getString("status"));
            item.setProfilePic(feedObj.getString("profilePic"));
            item.setTimeStamp(feedObj.getString("timeStamp"));

            // url might be null sometimes
            String feedUrl = feedObj.isNull("url") ? null : feedObj
                    .getString("url");
            item.setUrl(feedUrl);

            feedItems.add(item);
        }

        // notify data changes to list adapater
        listAdapter.notifyDataSetChanged();
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

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

如果需要，我会上传更多代码。 的 FeedListAdapter.java 

@SuppressLint("InflateParams")
public class FeedListAdapter extends BaseAdapter {  
private Activity activity;
private LayoutInflater inflater;
private List<FeedItem> feedItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();

public FeedListAdapter(Activity activity, List<FeedItem> feedItems) {
    this.activity = activity;
    this.feedItems = feedItems;
}

@Override
public int getCount() {
    return feedItems.size();
}

@Override
public Object getItem(int location) {
    return feedItems.get(location);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (inflater == null)
        inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null)
        convertView = inflater.inflate(R.layout.feed_item, null);

    if (imageLoader == null)
        imageLoader = AppController.getInstance().getImageLoader();

    TextView name = (TextView) convertView.findViewById(R.id.name);
    TextView timestamp = (TextView) convertView
            .findViewById(R.id.timestamp);
    TextView statusMsg = (TextView) convertView
            .findViewById(R.id.txtStatusMsg);
    TextView url = (TextView) convertView.findViewById(R.id.txtUrl);
    NetworkImageView profilePic = (NetworkImageView) convertView
            .findViewById(R.id.profilePic);
    FeedImageView feedImageView = (FeedImageView) convertView
            .findViewById(R.id.feedImage1);

    FeedItem item = feedItems.get(position);

    name.setText(item.getName());

    // Converting timestamp into x ago format
    CharSequence timeAgo = DateUtils.getRelativeTimeSpanString(
            Long.parseLong(item.getTimeStamp()),
            System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);
    timestamp.setText(timeAgo);

    // Chcek for empty status message
    if (!TextUtils.isEmpty(item.getStatus())) {
        statusMsg.setText(item.getStatus());
        statusMsg.setVisibility(View.VISIBLE);
    } else {
        // status is empty, remove from view
        statusMsg.setVisibility(View.GONE);
    }

    // Checking for null feed url
    if (item.getUrl() != null) {
        url.setText(Html.fromHtml("<a href=\"" + item.getUrl() + "\">"
                + item.getUrl() + "</a> "));

        // Making url clickable
        url.setMovementMethod(LinkMovementMethod.getInstance());
        url.setVisibility(View.VISIBLE);
    } else {
        // url is null, remove from the view
        url.setVisibility(View.GONE);
    }

    // user profile pic
    profilePic.setImageUrl(item.getProfilePic(), imageLoader);

    // Feed image
    if (item.getImge() != null) {
        feedImageView.setImageUrl(item.getImge(), imageLoader);
        feedImageView.setVisibility(View.VISIBLE);
        feedImageView
                .setResponseObserver(new FeedImageView.ResponseObserver() {
                    @Override
                    public void onError() {
                    }

                    @Override
                    public void onSuccess() {
                    }
                });
    } else {
        feedImageView.setVisibility(View.GONE);
    }

    return convertView;
    }

}

FeedIteam 

package com.wangjian.klmeet_sightseeing.model;

public class FeedItem {
private int id;
private String name, status, image, profilePic, timeStamp, url;

public FeedItem() {
}

public FeedItem(int id, String name, String image, String status,
        String profilePic, String timeStamp, String url) {
    super();
    this.id = id;
    this.name = name;
    this.image = image;
    this.status = status;
    this.profilePic = profilePic;
    this.timeStamp = timeStamp;
    this.url = url;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getImge() {
    return image;
}

public void setImge(String image) {
    this.image = image;
}

public String getStatus() {
    return status;
}

public void setStatus(String status) {
    this.status = status;
}

public String getProfilePic() {
    return profilePic;
}

public void setProfilePic(String profilePic) {
    this.profilePic = profilePic;
}

public String getTimeStamp() {
    return timeStamp;
}

public void setTimeStamp(String timeStamp) {
    this.timeStamp = timeStamp;
}

public String getUrl() {
    return url;
}

public void setUrl(String url) {
    this.url = url;
   }
}

我根据需要上传XML文件

feed_item.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/feed_bg"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginLeft="@dimen/feed_item_margin"
        android:layout_marginRight="@dimen/feed_item_margin"
        android:layout_marginTop="@dimen/feed_item_margin"
        android:background="@drawable/bg_parent_rounded_corner"
        android:orientation="vertical"
        android:paddingBottom="@dimen/feed_item_padding_top_bottom"
        android:paddingTop="@dimen/feed_item_padding_top_bottom" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingLeft="@dimen/feed_item_padding_left_right"
            android:paddingRight="@dimen/feed_item_padding_left_right" >

            <com.android.volley.toolbox.NetworkImageView
                android:id="@+id/profilePic"
                android:layout_width="@dimen/feed_item_profile_pic"
                android:layout_height="@dimen/feed_item_profile_pic"
                android:scaleType="fitCenter" >
            </com.android.volley.toolbox.NetworkImageView>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:paddingLeft="@dimen/feed_item_profile_info_padd" >

                <TextView
                    android:id="@+id/name"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:textSize="@dimen/feed_item_profile_name"
                    android:textStyle="bold" />

                <TextView
                    android:id="@+id/timestamp"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:textColor="@color/timestamp"
                    android:textSize="@dimen/feed_item_timestamp" />
            </LinearLayout>
        </LinearLayout>

        <TextView
            android:id="@+id/txtStatusMsg"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingBottom="5dp"
            android:paddingLeft="@dimen/feed_item_status_pad_left_right"
            android:paddingRight="@dimen/feed_item_status_pad_left_right"
            android:paddingTop="@dimen/feed_item_status_pad_top" />

        <TextView
            android:id="@+id/txtUrl"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:linksClickable="true"
            android:paddingBottom="10dp"
            android:paddingLeft="@dimen/feed_item_status_pad_left_right"
            android:paddingRight="@dimen/feed_item_status_pad_left_right"
            android:textColorLink="@color/link" />

        <info.androidhive.listviewfeed.FeedImageView
            android:id="@+id/feedImage1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"
            android:scaleType="fitXY"
            android:visibility="visible" />
    </LinearLayout>

</LinearLayout>

这是我的第一个活动 **This is my first activity**

第二个应该是这样的 **the second one should be like this**

但是 **But**

JSON 

{
    "feed": [
        {
            "id": 1,
            "name": "National Geographic Channel",
            "image": "http://api.androidhive.info/feed/img/cosmos.jpg",
            "status": "\"Science is a beautiful and emotional human endeavor,\" says Brannon Braga, executive producer and director. \"And Cosmos is all about making science an experience.\"",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": null
        },
        {
            "id": 2,
            "name": "TIME",
            "image": "http://api.androidhive.info/feed/img/time_best.jpg",
            "status": "30 years of Cirque du Soleil's best photos",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg,
            "timeStamp": "1403375851930",
            "url": "http://ti.me/1qW8MLB"
        },
        {
            "id": 5,
            "name": "Abraham Lincoln",
            "image": null,
            "status": "That some achieve great success, is proof to all that others can achieve it as well",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": null
        },
        {
            "id": 3,
            "name": "Discovery",
            "image": "http://api.androidhive.info/feed/img/discovery_mos.jpg",
            "status": "A team of Austrian scientists has developed a laser system that causes fruit flies to dance.",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": "http://dsc.tv/xmMxD"
        },
        {
            "id": 4,
            "name": "Ravi Tamada",
            "image": "http://api.androidhive.info/feed/img/nav_drawer.jpg",
            "status": "Android Sliding Menu using Navigation Drawer",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": "http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/"
        },
        {
            "id": 6,
            "name": "KTM",
            "image": "http://api.androidhive.info/feed/img/ktm_1290.jpg",
            "status": "\"The Beast\" KTM 1290 Super Duke",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": ""
        },
        {
            "id": 7,
            "name": "Harley-Davidson",
            "image": "http://api.androidhive.info/feed/img/harley_bike.jpg",
            "status": "We’re assembling riders of every style, bike, and passion. If you ride with conviction, ride with us. You have 24 days to get ready for World Ride. Prepare by visiting:",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": "http://bit.ly/1wmBWaN"
        },
        {
            "id": 8,
            "name": "Rock & Girl",
            "image": "http://api.androidhive.info/feed/img/rock.jpg",
            "status": "A long time back...",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": ""
        },
        {
            "id": 8,
            "name": "Gandhi",
            "image": null,
            "status": "An eye for an eye will make the whole world blind.",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": ""
        },
        {
            "id": 9,
            "name": "LIFE",
            "image": "http://api.androidhive.info/feed/img/life_photo.jpg",
            "status": "In 1965, LIFE photographer Bill Ray spent weeks with the Hells Angels, but his amazing photos never ran in the magazine",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": "http://ti.me/1rfcQa4"
        },
        {
            "id": 10,
            "name": "Shakira",
            "image": "http://api.androidhive.info/feed/img/shakira_la_la.png",
            "status": "Download La La La (Brazil 2014) from iTunes:",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": "http://smarturl.it/FWCalbum?IQid=sh"
        },
        {
            "id": 11,
            "name": "A. R. rahman",
            "image": "http://api.androidhive.info/feed/img/ar_bw.jpg",
            "status": "",
            "profilePic": "http://wangjian.site90.net/json/klcc.jpg",
            "timeStamp": "1403375851930",
            "url": ""
        }
    ]
}

我是这个东西的新手所以任何帮助将不胜感激。在此先感谢。！

1 个答案:

答案 0 :(得分：1)

首先， MainActivity 中的private String URL_FEED = "http://wangjian.site90.net/json/api_klmeet_sightseeing_face.json";不存在，当我在AdvanceRestClient中尝试时，我得到了这个：

enter image description here

所以我尝试了解更多WS的目录结构，发现上面没有你提到的任何这样的URL。

enter image description here

此外，我在尝试访问您的目录时遇到了安全问题：

enter image description here

我不确定您要认真对待的内容，但您可以尝试使用URL中的有效MainActivity，它应该可以正常使用。

安全问题让我感到沮丧。 ：（

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