W/System.err：org.json.JSONException：沒有值的飼料..即時通訊獲取此錯誤..即時通訊使用flickr API

-1

這裏是我的SplashActivity和JSON呼叫即時通訊試圖使用flickr API ..我一直關注教程上的壁紙應用程序..W/System.err：org.json.JSONException：沒有值的飼料..即時通訊獲取此錯誤..即時通訊使用flickr API

總是得到這個錯誤消息..我不知道該怎麼辦？

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Window; 
import android.widget.Toast; 

import com.android.volley.Request.Method; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.JsonObjectRequest; 
import com.shyamdev.animewallpaperhd.app.AppConst; 
import com.shyamdev.animewallpaperhd.app.AppController; 
import com.shyamdev.animewallpaperhd.picasa.model.Category; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.List; 

public class SplashActivity extends Activity { 
private static final String TAG = SplashActivity.class.getSimpleName(); 
private static final String TAG_FEED = "feed", TAG_ENTRY = "entry", 
     TAG_GPHOTO_ID = "gphoto$id", TAG_T = "$t", 
     TAG_ALBUM_TITLE = "title"; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().requestFeature(Window.FEATURE_ACTION_BAR); 
    getActionBar().hide(); 
    setContentView(R.layout.activity_splash); 

    // Picasa request to get list of albums 
    String url = AppConst.URL_FLICKR_ALBUMS 
      .replace("_PICASA_USER_", AppController.getInstance() 
        .getPrefManger().getGoogleUserName()); 

    Log.d(TAG, "Albums request url: " + url); 

    // Preparing volley's json object request 
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET, url, 
      new Response.Listener<JSONObject>() { 

     @Override 
     public void onResponse(JSONObject response) { 
      Log.d(TAG, "Albums Response: " + response.toString()); 
      List<Category> albums = new ArrayList<Category>(); 
      try { 
       // Parsing the json response 
       JSONArray entry = response.getJSONObject(TAG_FEED) 
         .getJSONArray(TAG_ENTRY); 

       // loop through albums nodes and add them to album 
       // list 
       for (int i = 0; i < entry.length(); i++) { 
        JSONObject albumObj = (JSONObject) entry.get(i); 
        // album id 
        String albumId = albumObj.getJSONObject(
          TAG_GPHOTO_ID).getString(TAG_T); 

        // album title 
        String albumTitle = albumObj.getJSONObject(
          TAG_ALBUM_TITLE).getString(TAG_T); 

        Category album = new Category(); 
        album.setId(albumId); 
        album.setTitle(albumTitle); 

        // add album to list 
        albums.add(album); 

        Log.d(TAG, "Album Id: " + albumId 
          + ", Album Title: " + albumTitle); 
       } 

       // Store albums in shared pref 
       AppController.getInstance().getPrefManger() 
         .storeCategories(albums); 

       // String the main activity 
       Intent intent = new Intent(getApplicationContext(), 
         MainActivity.class); 
       startActivity(intent); 
       // closing spalsh activity 
       finish(); 

      } catch (JSONException e) { 
       e.printStackTrace(); 
       Toast.makeText(getApplicationContext(), 
         getString(R.string.msg_unknown_error), 
         Toast.LENGTH_LONG).show(); 
      } 

     } 
    }, new Response.ErrorListener() { 

     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.e(TAG, "Volley Error: " + error.getMessage()); 

      // show error toast 
      Toast.makeText(getApplicationContext(), 
        getString(R.string.splash_error), 
        Toast.LENGTH_LONG).show(); 

      // Unable to fetch albums 
      // check for existing Albums data in Shared Preferences 
      if (AppController.getInstance().getPrefManger() 
        .getCategories() != null && AppController.getInstance().getPrefManger() 
        .getCategories().size() > 0) { 
       // String the main activity 
       Intent intent = new Intent(getApplicationContext(), 
         MainActivity.class); 
       startActivity(intent); 
       // closing spalsh activity 
       finish(); 
      } else { 
       // Albums data not present in the shared preferences 
       // Launch settings activity, so that user can modify 
       // the settings 

       // Intent i = new Intent(SplashActivity.this, 
       //SettingsActivity.class); 
       // clear all the activities 
       // i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK 
       // | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
       //startActivity(i); 
      } 

     } 

    }); 

    // disable the cache for this request, so that it always fetches updated 
    // json 
    jsonObjReq.setShouldCache(false); 

    // Making the request 
    AppController.getInstance().addToRequestQueue(jsonObjReq); 

}

這裏是logcat的..這裏是錯誤

enter code here 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:   org.json.JSONException: No value for feed 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at org.json.JSONObject.get(JSONObject.java:389) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at org.json.JSONObject.getJSONObject(JSONObject.java:609) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at com.shyamdev.animewallpaperhd.SplashActivity$1.onResponse(SplashActivity.java:55) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at com.shyamdev.animewallpaperhd.SplashActivity$1.onResponse(SplashActivity.java:47) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:72) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at android.os.Handler.handleCallback(Handler.java:739) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at android.os.Looper.loop(Looper.java:135) 
10-18 06:17:11.937 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:5289) 
10-18 06:17:11.938 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
10-18 06:17:11.938 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at java.lang.reflect.Method.invoke(Method.java:372) 
10-18 06:17:11.938 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
10-18 06:17:11.938 20262-20262/com.shyamdev.animewallpaperhd W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
10-18 06:17:11.998 20262-20302/com.shyamdev.animewallpaperhd V/RenderScript: Application requested CPU execution 
10-18 06:17:12.002 20262-20302/com.shyamdev.animewallpaperhd V/RenderScript: 0x558bec9140 Launching thread(s), CPUs 4

需要幫助

import java.io.Serializable; 

public class Wallpaper implements Serializable { 
private static final long serialVersionUID = 1L; 
private String url, photoJson; 
private int width, height; 

public Wallpaper() { 
} 

public Wallpaper(String photoJson, String url, int width, int height) {  
    this.photoJson = photoJson; 
    this.url = url; 
    this.width = width; 
    this.height = height; 
} 

public String getUrl() { 
    return url; 
} 

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

public String getPhotoJson() { 
    return photoJson; 
} 

public void setPhotoJson(String photoJson) { 
    this.photoJson = photoJson; 
} 

public int getWidth() { 
    return width; 
} 

public void setWidth(int width) { 
    this.width = width; 
} 

public int getHeight() { 
    return height; 
} 

public void setHeight(int height) { 
    this.height = height; 
}

}

這裏prefManager

import android.content.Context; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 
import android.util.Log; 

import com.google.gson.Gson; 
import com.shyamdev.animewallpaperhd.app.AppConst; 
import com.shyamdev.animewallpaperhd.picasa.model.Category; 

import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.Collections; 
import java.util.Comparator; 
import java.util.List; 

public class PrefManager { 
private static final String TAG = PrefManager.class.getSimpleName(); 

// Shared Preferences 
SharedPreferences pref; 

// Editor for Shared preferences 
Editor editor; 

// Context 
Context _context; 

// Shared pref mode 
int PRIVATE_MODE = 0; 

// Sharedpref file name 
private static final String PREF_NAME = "AwesomeWallpapers"; 

// Google's username 
private static final String KEY_GOOGLE_USERNAME = "google_username"; 

// No of grid columns 
private static final String KEY_NO_OF_COLUMNS = "no_of_columns"; 

// Gallery directory name 
private static final String KEY_GALLERY_NAME = "gallery_name"; 

// gallery albums key 
private static final String KEY_ALBUMS = "albums"; 

public PrefManager(Context context) { 
    this._context = context; 
    pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE); 

} 

/** 
* Storing google username 
* */ 
public void setGoogleUsername(String googleUsername) { 
    editor = pref.edit(); 

    editor.putString(KEY_GOOGLE_USERNAME, googleUsername); 

    // commit changes 
    editor.commit(); 
} 

public String getGoogleUserName() { 
    return pref.getString(KEY_GOOGLE_USERNAME, AppConst.PICASA_USER); 
} 

/** 
* store number of grid columns 
* */ 
public void setNoOfGridColumns(int columns) { 
    editor = pref.edit(); 

    editor.putInt(KEY_NO_OF_COLUMNS, columns); 

    // commit changes 
    editor.commit(); 
} 

public int getNoOfGridColumns() { 
    return pref.getInt(KEY_NO_OF_COLUMNS, AppConst.NUM_OF_COLUMNS); 
} 

/** 
* storing gallery name 
* */ 
public void setGalleryName(String galleryName) { 
    editor = pref.edit(); 

    editor.putString(KEY_GALLERY_NAME, galleryName); 

    // commit changes 
    editor.commit(); 
} 

public String getGalleryName() { 
    return pref.getString(KEY_GALLERY_NAME, AppConst.SDCARD_DIR_NAME); 
} 

/** 
* Storing albums in shared preferences 
* */ 
public void storeCategories(List<Category> albums) { 
    editor = pref.edit(); 
    Gson gson = new Gson(); 

    Log.d(TAG, "Albums: " + gson.toJson(albums)); 

    editor.putString(KEY_ALBUMS, gson.toJson(albums)); 

    // save changes 
    editor.commit(); 
} 

/** 
* Fetching albums from shared preferences. Albums will be sorted before 
* returning in alphabetical order 
* */ 
public List<Category> getCategories() { 
    List<Category> albums = new ArrayList<Category>(); 

    if (pref.contains(KEY_ALBUMS)) { 
     String json = pref.getString(KEY_ALBUMS, null); 
     Gson gson = new Gson(); 
     Category[] albumArry = gson.fromJson(json, Category[].class); 

     albums = Arrays.asList(albumArry); 
     albums = new ArrayList<Category>(albums); 
    } else 
     return null; 

    List<Category> allAlbums = albums; 

    // Sort the albums in alphabetical order 
    Collections.sort(allAlbums, new Comparator<Category>() { 
     public int compare(Category a1, Category a2) { 
      return a1.getTitle().compareToIgnoreCase(a2.getTitle()); 
     } 
    }); 

    return allAlbums; 

} 

/** 
* Comparing albums titles for sorting 
* */ 
public class CustomComparator implements Comparator<Category> { 
    @Override 
    public int compare(Category c1, Category c2) { 
     return c1.getTitle().compareTo(c2.getTitle()); 
    } 
}

來源

2016-10-18 Jadu Kh

我認爲你在JSON解析期間遇到問題。也請添加JSON。 –

thnxx需要時間閱讀..我不知道該怎麼辦..這裏是教程網站，我一直遵循http://www.androidhive.info/2014/08/android-building-free-wallpapers- app-part-1/ –

您的API已投入使用？請檢查回覆併發布。 – Rahul

使用瀏覽器中的url值控制GET請求的響應，並檢查是否看到錯誤。檢查是否看到feed json對象。

AppConst.URL_FLICKR_ALBUMS = "https://picasaweb.google.com/data/feed/api/user/_PICASA_USER_?kind=album&alt=json"; 

String url = AppConst.URL_FLICKR_ALBUMS 
      .replace("_PICASA_USER_", AppController.getInstance() 
        .getPrefManger().getGoogleUserName());

不要忘記登錄AppController.getInstance（）。getPrefManger（）。getGoogleUserName（），看看你得到你的用戶名

檢查這個網址。 https://github.com/moktar/WallpaparsApp/blob/master/src/info/androidhive/awesomewallpapers/SplashActivity.java

你必須改變google_username到您的用戶名

private static final String KEY_GOOGLE_USERNAME = "google_username";

來源

2016-10-18 09:02:55

如何告訴我一個示例代碼... –

即時嘗試使用Flickr API ...因爲Picasa不能正常工作了...下面的教程http://www.androidhive.info/2014/08/android-building-free-wallpapers-app-part-1/ –

即時通訊使用flickr網址..不是picasa ...我會嘗試你的建議 –

從您的堆棧跟蹤，其明確的「飼料」標籤不來了。請張貼您的JSON以獲得更清晰的分析結果。

if(response.has(TAG_FEED){ 
JSONArray entry = response.getJSONObject(TAG_FEED) 
        .getJSONArray(TAG_ENTRY); 
....

來源

2016-10-18 09:25:56 Rahul

我一直在關注本教程 –

http://www.androidhive.info/2014/08/android-building -free-wallpapers-app-part-1/im新的編程需要每一個幫助 –

你可以發佈JSON結構，你將得到的迴應。 – Rahul

W/System.err：org.json.JSONException：沒有值的飼料..即時通訊獲取此錯誤..即時通訊使用flickr API

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