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POFATAL EXCEPTION: AsyncTask #1 do in background error with JSON
 

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  1. POFATAL EXCEPTION: AsyncTask #1 do in background error with JSON
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    <p>I'm trying to <strong>parse image to viewpager with asynctask into my app using JSON</strong>.I've encounter this problem for 2days after I fixed my JSON problem,now I encounter another problem with Async task. <strong>I've look through all the answers in stackoverflow</strong>,unfortunately none of them solve my problem.So here's my code and error log,any help would be greatly appreciated.</p> <p>json link-<a href="http://vina.harvestcamasu.com/vina/xml/image.json" rel="nofollow">http://vina.harvestcamasu.com/vina/xml/image.json</a></p> <pre><code>package vinajson.img; public class MainActivity extends Activity{ // url to make request private static String url ="http://vina.harvestcamasu.com/vina/xml/image.json"; // JSON Node names static String TAG_GALLERY = "Gallery"; static String TAG_ARTIST = "Artist"; static String TAG_IMAGE = "Image"; static String TAG_ID = "ID"; ... @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); context = this; //hashmap for view final ArrayList&lt;HashMap&lt;String, String&gt;&gt; imagelist = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); AsyncTask&lt;Void, Void, JSONObject&gt; task = new AsyncTask&lt;Void, Void, JSONObject&gt;() { @Override protected void onPreExecute() { mProgressDialog = new ProgressDialog(context); mProgressDialog.setTitle("Processing..."); mProgressDialog.setMessage("Please wait."); mProgressDialog.setCancelable(false); mProgressDialog.setIndeterminate(true); mProgressDialog.show(); } @Override protected JSONObject doInBackground(Void... arg0) { try { // Do something... Thread.sleep(5000); JSONParser jParser = new JSONParser(); json = jParser.getJSONFromUrl(url); JSONObject json = jParser.getJSONFromUrl(url); // get Gallery JSONObject JSONObject json_gallery=json.getJSONObject("Gallery"); // get Artist JSONObject JSONObject json_artist=json_gallery.getJSONObject("Artist"); // get Image JSONArray //getting array from image JSONArray Image = null; try { Image = json_artist.getJSONArray(TAG_IMAGE); for (int i = 0; i &lt; Image.length(); i++) { JSONObject m = Image.getJSONObject(i); //adding hashlist into arraylist imagelist.add(map); images[i] = m.getString("PicURL"); System.out.println(m.getString("ID")); System.out.println(m.getString("Name")); System.out.println(m.getString("PicURL")); System.out.println(m.getString("Date")); System.out.println(m.getString("Caption")); } InputStream is1 = (InputStream) new URL(images[0]).getContent(); d1 = Drawable.createFromStream(is1, "src name"); ... } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return json; } @Override protected void onPostExecute(JSONObject result) { if (mProgressDialog != null) { mProgressDialog.dismiss(); } //caption = result.getString(TAG_CAPTION); MyPagerAdapter adapter = new MyPagerAdapter(d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13); ViewPager myPager = (ViewPager) findViewById(R.id.viewpager); myPager.setAdapter(adapter); myPager.setCurrentItem(0); } }; task.execute((Void[]) null); } } </code></pre> <p>And now for the error log.</p> <pre><code> 12-06 12:01:53.589: W/dalvikvm(29144): threadid=1: thread exiting with uncaught exception (group=0x40c4f1f8) 12-06 12:01:53.597: E/AndroidRuntime(29144): FATAL EXCEPTION: main 12-06 12:01:53.597: E/AndroidRuntime(29144): java.lang.NullPointerException 12-06 12:01:53.597: E/AndroidRuntime(29144): at vinajson.img.MyPagerAdapter.getCount(MyPagerAdapter.java:47) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:434) 12-06 12:01:53.597: E/AndroidRuntime(29144): at vinajson.img.MainActivity$1.onPostExecute(MainActivity.java:200) 12-06 12:01:53.597: E/AndroidRuntime(29144): at vinajson.img.MainActivity$1.onPostExecute(MainActivity.java:1) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.os.AsyncTask.finish(AsyncTask.java:602) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.os.AsyncTask.access$600(AsyncTask.java:156) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.os.Handler.dispatchMessage(Handler.java:99) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.os.Looper.loop(Looper.java:137) 12-06 12:01:53.597: E/AndroidRuntime(29144): at android.app.ActivityThread.main(ActivityThread.java:4512) 12-06 12:01:53.597: E/AndroidRuntime(29144): at java.lang.reflect.Method.invokeNative(Native Method) 12-06 12:01:53.597: E/AndroidRuntime(29144): at java.lang.reflect.Method.invoke(Method.java:511) 12-06 12:01:53.597: E/AndroidRuntime(29144): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982) 12-06 12:01:53.597: E/AndroidRuntime(29144): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749) 12-06 12:01:53.597: E/AndroidRuntime(29144): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p><strong>Here's MyPagerAdapter.java</strong> </p> <pre><code>package vinajson.img; import org.json.JSONArray; import android.content.Context; .... public class MyPagerAdapter extends PagerAdapter { //private String caption; private Drawable d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13; private JSONArray Image; public MyPagerAdapter( Drawable draw1, Drawable draw2,Drawable draw3,Drawable draw4,Drawable draw5, Drawable draw6,Drawable draw7,Drawable draw8,Drawable draw9,Drawable draw10,Drawable draw11, Drawable draw12,Drawable draw13){ //caption = text; d1 = draw1; d2 = draw2; .... } public int getCount() { return Image.length(); } public Object instantiateItem(View collection, int position) { LayoutInflater inflater = (LayoutInflater) collection.getContext() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); int resId = R.layout.first_page; View view = inflater.inflate(resId, null); ImageView image1 = (ImageView)view.findViewById(R.id.imageView1); switch (position) { case 0: image1.setImageDrawable(d1); break; case 1: image1.setImageDrawable(d2); break; case 2: image1.setImageDrawable(d3); break; .... } ((ViewPager) collection).addView(view, 0); return view; } public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView((View) arg2); } public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == ((View) arg1); } public Parcelable saveState() { return null; } </code></pre> <p>}</p>
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    1. USSilverchain
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    1. COIt's a bit off-topic, but you should check out Volley, which is an awesome networking framework. https://www.youtube.com/watch?v=yhv8l9F44qo and https://android.googlesource.com/platform/frameworks/volley/
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      1. USkevin
    2. CObtw, look at your MainActivity.java:103, it's throwing an ArrayIndexOutOfBoundsException "java.lang.ArrayIndexOutOfBoundsException: length=12; index=12"
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      1. POFATAL EXCEPTION: AsyncTask #1 do in background error with JSON
      1. USkevin
    3. COthanks,I fixed ArrayIndexOutOfBoundsException problem,but now I encounter fatal exception:main problem.Error log updated.
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      1. POFATAL EXCEPTION: AsyncTask #1 do in background error with JSON
      1. USSilverchain
 

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