从网站加载图像到Android应用程序

我试图从使用Jsoup的网站加载一些图像。我的应用程序不断崩溃。我觉得行了，因为：从网站加载图像到Android应用程序

Elements divs =((Elements) doc).select("img[src$=.jpg]");

这里的LoadImages类的代码：

public class LoadImages extends AsyncTask { 

    private ArrayAdapter adapter; 


private ArrayList list; 


    public LoadImages(ArrayList list, Adapter adapter) 
    { 
     this.list = list; 
     this.adapter = (ArrayAdapter) adapter; 
    } 

    protected void onPostExecute(Elements divs) { 
     // TODO Auto-generated method stub 
     super.onPostExecute(divs); 
     for (org.jsoup.nodes.Element div : divs) 
     { 
      list.add(div); 
     } 
     adapter.notifyDataSetChanged(); 

    } 

    @Override 
    protected Object doInBackground(Object... params) { 
     Document doc = null; 

     try { 


     doc = (Document) Jsoup.connect("http://mongol.co.il/").get(); 
     Elements divs =((Elements) doc).select("img[src$=.jpg]"); 



     } catch (IOException e1) { 

     e1.printStackTrace(); } 
     return null; 



    } 



}

，这也是主类：

public class MainActivity extends Activity{ 

    private ListView listView; 
    private ArrayAdapter adapter; 
    private ArrayList list; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.listview); 
     listView = (ListView) findViewById(R.id.listview); 
     list = new ArrayList(); 
      adapter = new ArrayAdapter(this, 
       android.R.layout.simple_list_item_1, list); 

      listView.setAdapter(adapter); 
      new LoadImages(list, adapter).execute(); 

    } 
}

为什么它会崩溃？

04-20 12:52:38.089: I/global(400): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required. 
04-20 12:52:38.539: D/dalvikvm(400): GC_FOR_MALLOC freed 1781 objects/98016 bytes in 115ms 
04-20 12:52:38.649: D/dalvikvm(400): GC_FOR_MALLOC freed 252 objects/143016 bytes in 95ms 
04-20 12:52:38.820: D/dalvikvm(400): GC_FOR_MALLOC freed 90 objects/434944 bytes in 156ms 
04-20 12:52:38.939: D/dalvikvm(400): GC_FOR_MALLOC freed 8 objects/194848 bytes in 95ms 
04-20 12:52:38.949: I/dalvikvm-heap(400): Grow heap (frag case) to 3.288MB for 389136-byte allocation 
04-20 12:52:39.119: D/dalvikvm(400): GC_FOR_MALLOC freed 0 objects/0 bytes in 166ms 
04-20 12:52:39.269: D/dalvikvm(400): GC_FOR_MALLOC freed 44 objects/390808 bytes in 146ms 
04-20 12:52:39.659: D/dalvikvm(400): GC_FOR_MALLOC freed 1668 objects/521136 bytes in 94ms 
04-20 12:52:40.399: D/dalvikvm(400): GC_FOR_MALLOC freed 2484 objects/134640 bytes in 90ms 
04-20 12:52:40.699: D/dalvikvm(400): GC_FOR_MALLOC freed 4499 objects/172528 bytes in 101ms 
04-20 12:52:40.699: I/dalvikvm-heap(400): Grow heap (frag case) to 3.682MB for 287718-byte allocation 
04-20 12:52:40.880: D/dalvikvm(400): GC_FOR_MALLOC freed 0 objects/0 bytes in 176ms 
04-20 12:52:41.559: D/dalvikvm(400): GC_FOR_MALLOC freed 6721 objects/326776 bytes in 109ms 
04-20 12:52:42.470: D/dalvikvm(400): GC_FOR_MALLOC freed 9512 objects/399904 bytes in 122ms 
04-20 12:52:43.219: D/dalvikvm(400): GC_FOR_MALLOC freed 9557 objects/402640 bytes in 115ms 
04-20 12:52:44.039: D/dalvikvm(400): GC_FOR_MALLOC freed 10870 objects/452144 bytes in 138ms 
04-20 12:52:44.902: D/dalvikvm(400): GC_FOR_MALLOC freed 11333 objects/486376 bytes in 136ms 
04-20 12:52:45.791: D/dalvikvm(400): GC_FOR_MALLOC freed 12106 objects/505752 bytes in 148ms 
04-20 12:52:45.958: D/AndroidRuntime(400): Shutting down VM 
04-20 12:52:45.958: W/dalvikvm(400): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
04-20 12:52:46.061: E/AndroidRuntime(400): FATAL EXCEPTION: main 
04-20 12:52:46.061: E/AndroidRuntime(400): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mongol/com.example.mongol.MainActivity}: java.lang.ClassCastException: org.jsoup.nodes.Document 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.os.Looper.loop(Looper.java:123) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-20 12:52:46.061: E/AndroidRuntime(400): at java.lang.reflect.Method.invokeNative(Native Method) 
04-20 12:52:46.061: E/AndroidRuntime(400): at java.lang.reflect.Method.invoke(Method.java:521) 
04-20 12:52:46.061: E/AndroidRuntime(400): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
04-20 12:52:46.061: E/AndroidRuntime(400): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
04-20 12:52:46.061: E/AndroidRuntime(400): at dalvik.system.NativeStart.main(Native Method) 
04-20 12:52:46.061: E/AndroidRuntime(400): Caused by: java.lang.ClassCastException: org.jsoup.nodes.Document 
04-20 12:52:46.061: E/AndroidRuntime(400): at com.example.mongol.MainActivity.onCreate(MainActivity.java:56) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-20 12:52:46.061: E/AndroidRuntime(400): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
04-20 12:52:46.061: E/AndroidRuntime(400): ... 11 more 
04-20 12:52:49.409: I/Process(400): Sending signal. PID: 400 SIG: 9 
04-20 15:39:54.631: W/KeyCharacterMap(429): No keyboard for id 0 
04-20 15:39:54.710: W/KeyCharacterMap(429): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 
04-20 15:40:05.249: D/dalvikvm(429): GC_EXPLICIT freed 994 objects/71000 bytes in 128ms 
04-20 15:49:13.209: I/global(458): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required. 
04-20 15:49:13.439: D/dalvikvm(458): GC_FOR_MALLOC freed 1802 objects/101888 bytes in 103ms 
04-20 15:49:13.560: D/dalvikvm(458): GC_FOR_MALLOC freed 263 objects/143728 bytes in 110ms 
04-20 15:49:13.669: D/dalvikvm(458): GC_FOR_MALLOC freed 122 objects/436400 bytes in 100ms 
04-20 15:49:13.769: D/dalvikvm(458): GC_FOR_MALLOC freed 3 objects/194656 bytes in 93ms 
04-20 15:49:13.779: I/dalvikvm-heap(458): Grow heap (frag case) to 3.285MB for 389136-byte allocation 
04-20 15:49:13.899: D/dalvikvm(458): GC_FOR_MALLOC freed 0 objects/0 bytes in 116ms 
04-20 15:49:14.009: D/dalvikvm(458): GC_FOR_MALLOC freed 44 objects/390808 bytes in 100ms 
04-20 15:49:14.739: D/dalvikvm(458): GC_FOR_MALLOC freed 1683 objects/528096 bytes in 344ms 
04-20 15:49:15.899: D/dalvikvm(458): GC_FOR_MALLOC freed 2471 objects/125872 bytes in 136ms 
04-20 15:49:16.298: D/dalvikvm(458): GC_FOR_MALLOC freed 4499 objects/172424 bytes in 115ms 
04-20 15:49:16.298: I/dalvikvm-heap(458): Grow heap (frag case) to 3.680MB for 287718-byte allocation 
04-20 15:49:16.418: D/dalvikvm(458): GC_FOR_MALLOC freed 0 objects/0 bytes in 112ms 
04-20 15:49:17.469: D/dalvikvm(458): GC_FOR_MALLOC freed 6831 objects/326392 bytes in 108ms 
04-20 15:49:18.499: D/dalvikvm(458): GC_FOR_MALLOC freed 9478 objects/399328 bytes in 122ms 
04-20 15:49:19.869: D/dalvikvm(458): GC_FOR_MALLOC freed 9571 objects/402800 bytes in 125ms 
04-20 15:49:21.090: D/dalvikvm(458): GC_FOR_MALLOC freed 10892 objects/452648 bytes in 251ms 
04-20 15:49:22.429: D/dalvikvm(458): GC_FOR_MALLOC freed 11307 objects/484816 bytes in 184ms 
04-20 15:49:23.689: D/dalvikvm(458): GC_FOR_MALLOC freed 13250 objects/550520 bytes in 244ms 
04-20 15:49:23.849: W/dalvikvm(458): threadid=7: thread exiting with uncaught exception (group=0x4001d800) 
04-20 15:49:23.979: E/AndroidRuntime(458): FATAL EXCEPTION: AsyncTask #1 
04-20 15:49:23.979: E/AndroidRuntime(458): java.lang.RuntimeException: An error occured while executing doInBackground() 
04-20 15:49:23.979: E/AndroidRuntime(458): at android.os.AsyncTask$3.done(AsyncTask.java:200) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.lang.Thread.run(Thread.java:1096) 
04-20 15:49:23.979: E/AndroidRuntime(458): Caused by: java.lang.ClassCastException: org.jsoup.nodes.Document 
04-20 15:49:23.979: E/AndroidRuntime(458): at com.example.mongol.LoadImages.doInBackground(LoadImages.java:42) 
04-20 15:49:23.979: E/AndroidRuntime(458): at android.os.AsyncTask$2.call(AsyncTask.java:185) 
04-20 15:49:23.979: E/AndroidRuntime(458): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
04-20 15:49:23.979: E/AndroidRuntime(458): ... 4 more 
04-20 15:49:37.699: I/Process(458): Sending signal. PID: 458 SIG: 9 
04-20 15:49:52.489: I/global(468): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required. 
04-20 15:49:53.269: D/dalvikvm(468): GC_FOR_MALLOC freed 1829 objects/102928 bytes in 115ms 
04-20 15:49:53.371: D/dalvikvm(468): GC_FOR_MALLOC freed 268 objects/143944 bytes in 84ms 
04-20 15:49:53.469: D/dalvikvm(468): GC_FOR_MALLOC freed 122 objects/436400 bytes in 94ms 
04-20 15:49:53.562: D/dalvikvm(468): GC_FOR_MALLOC freed 3 objects/194656 bytes in 82ms 
04-20 15:49:53.571: I/dalvikvm-heap(468): Grow heap (frag case) to 3.286MB for 389136-byte allocation 
04-20 15:49:53.749: D/dalvikvm(468): GC_FOR_MALLOC freed 0 objects/0 bytes in 176ms 
04-20 15:49:53.849: D/dalvikvm(468): GC_FOR_MALLOC freed 49 objects/391000 bytes in 83ms 
04-20 15:49:54.190: D/dalvikvm(468): GC_FOR_MALLOC freed 1680 objects/528016 bytes in 84ms 
04-20 15:49:54.888: D/dalvikvm(468): GC_FOR_MALLOC freed 2471 objects/125776 bytes in 109ms 
04-20 15:49:55.170: D/dalvikvm(468): GC_FOR_MALLOC freed 4499 objects/172400 bytes in 106ms 
04-20 15:49:55.170: I/dalvikvm-heap(468): Grow heap (frag case) to 3.680MB for 287718-byte allocation 
04-20 15:49:55.319: D/dalvikvm(468): GC_FOR_MALLOC freed 0 objects/0 bytes in 149ms 
04-20 15:49:55.958: D/dalvikvm(468): GC_FOR_MALLOC freed 6830 objects/326368 bytes in 126ms 
04-20 15:49:56.620: D/dalvikvm(468): GC_FOR_MALLOC freed 9475 objects/398952 bytes in 116ms 
04-20 15:49:57.329: D/dalvikvm(468): GC_FOR_MALLOC freed 9550 objects/402112 bytes in 139ms 
04-20 15:49:58.140: D/dalvikvm(468): GC_FOR_MALLOC freed 10895 objects/452624 bytes in 139ms 
04-20 15:49:58.959: D/dalvikvm(468): GC_FOR_MALLOC freed 11316 objects/485416 bytes in 151ms 
04-20 15:49:59.989: D/dalvikvm(468): GC_FOR_MALLOC freed 12105 objects/505736 bytes in 281ms 
04-20 15:50:00.270: W/dalvikvm(468): threadid=7: thread exiting with uncaught exception (group=0x4001d800) 
04-20 15:50:00.279: E/AndroidRuntime(468): FATAL EXCEPTION: AsyncTask #1 
04-20 15:50:00.279: E/AndroidRuntime(468): java.lang.RuntimeException: An error occured while executing doInBackground() 
04-20 15:50:00.279: E/AndroidRuntime(468): at android.os.AsyncTask$3.done(AsyncTask.java:200) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.lang.Thread.run(Thread.java:1096) 
04-20 15:50:00.279: E/AndroidRuntime(468): Caused by: java.lang.ClassCastException: org.jsoup.nodes.Document 
04-20 15:50:00.279: E/AndroidRuntime(468): at com.example.mongol.LoadImages.doInBackground(LoadImages.java:42) 
04-20 15:50:00.279: E/AndroidRuntime(468): at android.os.AsyncTask$2.call(AsyncTask.java:185) 
04-20 15:50:00.279: E/AndroidRuntime(468): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
04-20 15:50:00.279: E/AndroidRuntime(468): ... 4 more 
04-20 15:50:04.700: I/Process(468): Sending signal. PID: 468 SIG: 9 
04-20 15:52:50.449: I/global(499): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required. 
04-20 15:52:50.959: D/dalvikvm(499): GC_FOR_MALLOC freed 1845 objects/103584 bytes in 98ms 
04-20 15:52:51.049: D/dalvikvm(499): GC_FOR_MALLOC freed 273 objects/144160 bytes in 88ms 
04-20 15:52:51.159: D/dalvikvm(499): GC_FOR_MALLOC freed 122 objects/436400 bytes in 84ms 
04-20 15:52:51.249: D/dalvikvm(499): GC_FOR_MALLOC freed 3 objects/194656 bytes in 87ms 
04-20 15:52:51.259: I/dalvikvm-heap(499): Grow heap (frag case) to 3.286MB for 389136-byte allocation 
04-20 15:52:51.441: D/dalvikvm(499): GC_FOR_MALLOC freed 0 objects/0 bytes in 177ms 
04-20 15:52:51.549: D/dalvikvm(499): GC_FOR_MALLOC freed 49 objects/391000 bytes in 91ms 
04-20 15:52:51.909: D/dalvikvm(499): GC_FOR_MALLOC freed 1680 objects/528008 bytes in 87ms 
04-20 15:52:52.599: D/dalvikvm(499): GC_FOR_MALLOC freed 2471 objects/125840 bytes in 90ms 
04-20 15:52:52.889: D/dalvikvm(499): GC_FOR_MALLOC freed 4499 objects/172424 bytes in 117ms 
04-20 15:52:52.889: I/dalvikvm-heap(499): Grow heap (frag case) to 3.680MB for 287718-byte allocation 
04-20 15:52:52.989: D/dalvikvm(499): GC_FOR_MALLOC freed 0 objects/0 bytes in 94ms 
04-20 15:52:53.639: D/dalvikvm(499): GC_FOR_MALLOC freed 6828 objects/326288 bytes in 125ms 
04-20 15:52:54.419: D/dalvikvm(499): GC_FOR_MALLOC freed 9477 objects/398960 bytes in 103ms 
04-20 15:52:55.079: D/dalvikvm(499): GC_FOR_MALLOC freed 9569 objects/403072 bytes in 109ms 
04-20 15:52:55.911: D/dalvikvm(499): GC_FOR_MALLOC freed 10890 objects/452384 bytes in 135ms 
04-20 15:52:56.719: D/dalvikvm(499): GC_FOR_MALLOC freed 11307 objects/485008 bytes in 127ms 
04-20 15:52:57.619: D/dalvikvm(499): GC_FOR_MALLOC freed 12099 objects/505496 bytes in 165ms 
04-20 15:52:57.789: W/dalvikvm(499): threadid=7: thread exiting with uncaught exception (group=0x4001d800) 
04-20 15:52:57.799: E/AndroidRuntime(499): FATAL EXCEPTION: AsyncTask #1 
04-20 15:52:57.799: E/AndroidRuntime(499): java.lang.RuntimeException: An error occured while executing doInBackground() 
04-20 15:52:57.799: E/AndroidRuntime(499): at android.os.AsyncTask$3.done(AsyncTask.java:200) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.lang.Thread.run(Thread.java:1096) 
04-20 15:52:57.799: E/AndroidRuntime(499): Caused by: java.lang.ClassCastException: org.jsoup.nodes.Document 
04-20 15:52:57.799: E/AndroidRuntime(499): at com.example.mongol.LoadImages.doInBackground(LoadImages.java:42) 
04-20 15:52:57.799: E/AndroidRuntime(499): at android.os.AsyncTask$2.call(AsyncTask.java:185) 
04-20 15:52:57.799: E/AndroidRuntime(499): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
04-20 15:52:57.799: E/AndroidRuntime(499): ... 4 more 
04-20 15:53:07.380: I/Process(499): Sending signal. PID: 499 SIG: 9

来源

2013-04-20 Avi2107

发布logcat ..并确保doc不为空。 – 2013-04-20 16:37:29

@TGMCians我做过 – Avi2107 2013-04-20 16:59:37

你在主要活动的第56行做什么？日志显示您正试图将jSoup文档转换为其他不允许的文档。我对这条线有怀疑：Elements divs =（（Elements）doc）.select（“img [src $ =。jpg]”）; – Ankit 2013-04-22 18:28:49

您从doInBackground（） returninig 空。将代码更改为此，它将起作用：

Document doc = null; 

    try { 


    doc = (Document) Jsoup.connect("http://mongol.co.il/").get(); 
    Elements divs =((Elements) doc).select("img[src$=.jpg]"); 



    } catch (IOException e1) { 

    e1.printStackTrace(); } 
    return divs;

来源

2013-04-20 16:40:01

保持崩溃.. – Avi2107 2013-04-20 16:46:44

从网站加载图像到Android应用程序

回答

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