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POImageLoader NullPointerException for an off-screen, SlidingMenu item?
 

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  1. POImageLoader NullPointerException for an off-screen, SlidingMenu item?
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    <p>I'm parsing a JSON response from a weather feed and the data I receive includes a url to an icon that corresponds with the conditions, then I display that icon in an ImageView. I was able to make this work in a sandbox app before moving the package of code into my project.</p> <p>In the main project I use the latest versions of <a href="https://github.com/JakeWharton/ActionBarSherlock" rel="nofollow noreferrer" title="ActionBarSherlock">ActionBarSherlock</a> and <a href="https://github.com/jfeinstein10/SlidingMenu" rel="nofollow noreferrer" title="SlidingMenu">SlidingMenu</a> for navigation, and both apps make use of <a href="https://github.com/loopj/android-async-http" rel="nofollow noreferrer" title="Android Asynchronous Http Client">Android-Async-Http-Client</a> but now it has a fatal NullPointerException when trying to display the icon from that url in the ImageView. I don't think this is caused by any of the libraries.</p> <p>I've seen that sliding menus mostly consist of some type of ListView handled with an Adapter, which I'm doing in a portion of my sliding menu. But the only clue I have is that it crashes because now it's an off-screen UI element that I'm trying to work with. Does it matter that I have something in my sliding menu that isn't handled by an Adapter? I can't imagine much else is different but maybe you guys some clue of what I'm missing. Hopefully it isn't something basic that I'm just forgetting... or maybe it is :)</p> <p>Alright, thanks for any ideas.</p> <p><img src="https://i.stack.imgur.com/p6kdX.png" alt="wireframe"></p> <pre><code>public class MainActivity extends SlidingActivity implements ActionBar.OnNavigationListener { final String TAG = "MainActivity"; private TextView mSelected; private String[] mLocations; ImageLoader imageLoader; ImageView weatherIcon; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imageLoader = new ImageLoader(this); wireViews(); getWeatherFeed(); Context context = getSupportActionBar().getThemedContext(); ArrayAdapter&lt;CharSequence&gt; list = ArrayAdapter.createFromResource( context, R.array.activities, R.layout.sherlock_spinner_item); list.setDropDownViewResource(R.layout.sherlock_spinner_dropdown_item); getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST); getSupportActionBar().setListNavigationCallbacks(list, this); getSupportActionBar().setDisplayShowTitleEnabled(false); // set the Behind View setBehindContentView(R.layout.menu_frame); // SlidingMenu SlidingMenu sm = getSlidingMenu(); sm.setShadowWidthRes(R.dimen.shadow_width); sm.setShadowDrawable(R.drawable.shadow); sm.setBehindOffsetRes(R.dimen.slidingmenu_offset); sm.setFadeDegree(0.35f); sm.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN); getSupportActionBar().setDisplayHomeAsUpEnabled(true); setSlidingActionBarEnabled(false); ListView menuList = (ListView) findViewById(R.id.menuList); SlidingMenuItem[] data = new SlidingMenuItem[] { new SlidingMenuItem("Item1 Label", "Item1 Sub-label",getResources().getDrawable(R.drawable.item1)), new SlidingMenuItem("Item2 Label", "Item2 Sub-Label",getResources().getDrawable(R.drawable.item2)) }; MenuAdapter adapter = new MenuAdapter(this, R.layout.sliding_menu_item, data); menuList.setAdapter(adapter); } private void updateWeatherUi(String degreeText, String descriptionText, String iconUrl) { Log.i(TAG, "Updating UI elements..."); if (imageLoader != null) { Log.i(TAG, "IMAGE_LOADER NOT NULL!!!"); } imageLoader.DisplayImage(iconUrl, weatherIcon); // FIXME: FATAL CRASH HERE !!! } /** Build a Weather object from the JSON response. * @throws JSONException */ private void buildWeatherObject(String rawResponse) throws JSONException { Log.i(TAG, "Building Weather ojbect..."); JSONObject baseObject = new JSONObject(rawResponse); JSONObject data = new JSONObject(baseObject.getString(Key.DATA)); JSONArray conditionArray = new JSONArray( data.getString(Key.CURRENT_CONDITION)); for (int i = 0; i &lt; conditionArray.length(); i++) { JSONObject conditionElement = new JSONObject( conditionArray.getString(i)); weather = new Weather(); weather.tempMaxF = conditionElement.getString(Key.TEMP_F); JSONArray weatherDescriptionArray = new JSONArray( conditionElement.getString(Key.W_WEATHER_DESC)); for (int j = 0; j &lt; weatherDescriptionArray.length(); j++) { JSONObject weatherDescriptionElement = new JSONObject( weatherDescriptionArray.getString(j)); weather.weatherDesc = weatherDescriptionElement .getString(Key.VALUE); } JSONArray weatherIconArray = new JSONArray( conditionElement.getString(Key.WEATHER_ICON_URL)); for (int j = 0; j &lt; weatherIconArray.length(); j++) { JSONObject weatherIconElement = new JSONObject( weatherIconArray.getString(j)); weather.weatherIconUrl = weatherIconElement .getString(Key.VALUE); Log.i(TAG, weather.weatherIconUrl); } conditionElement = null; updateWeatherUi(weather.tempMaxF, weather.weatherDesc, weather.weatherIconUrl); } } /** Asynchronously request and receive weather feed data. */ private void getWeatherFeed() { Log.i(TAG, "Getting asynchronous JSON feed..."); AsyncHttpClient client = new AsyncHttpClient(); client.get(WEATHER_FEED_URL, new AsyncHttpResponseHandler() { @Override public void onSuccess(String response) { try { buildWeatherObject(response); } catch (JSONException e) { e.printStackTrace(); } } @Override public void onFailure(Throwable arg0, String arg1) { super.onFailure(arg0, arg1); showToast("Sorry, the weather forecast wasn't available just then."); } }); } private void wireViews() { Log.i(TAG, "Wiring UI elements..."); mSelected = (TextView) findViewById(R.id.text); mLocations = getResources().getStringArray(R.array.activities); weatherIcon = (ImageView) findViewById(R.id.weatherIconView); } 12-21 01:01:11.130: I/MainActivity(28502): Building Weather ojbect... 12-21 01:01:11.170: I/MainActivity(28502): http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0001_sunny.png 12-21 01:01:11.170: I/MainActivity(28502): Updating UI elements... 12-21 01:01:11.170: I/MainActivity(28502): IMAGE_LOADER NOT NULL!!! 12-21 01:01:11.170: D/AndroidRuntime(28502): Shutting down VM 12-21 01:01:11.170: W/dalvikvm(28502): threadid=1: thread exiting with uncaught exception (group=0x4001d5a0) 12-21 01:01:11.180: E/AndroidRuntime(28502): FATAL EXCEPTION: main 12-21 01:01:11.180: E/AndroidRuntime(28502): java.lang.NullPointerException 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.eric.app.networkxml.ImageLoader.DisplayImage(ImageLoader.java:42) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.eric.app.MainActivity.updateWeatherUi(MainActivity.java:129) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.eric.app.MainActivity.buildWeatherObject(MainActivity.java:172) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.eric.app.MainActivity.access$0(MainActivity.java:137) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.eric.app.MainActivity$1.onSuccess(MainActivity.java:195) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.loopj.android.http.AsyncHttpResponseHandler.handleSuccessMessage(AsyncHttpResponseHandler.java:160) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.loopj.android.http.AsyncHttpResponseHandler.handleMessage(AsyncHttpResponseHandler.java:173) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.loopj.android.http.AsyncHttpResponseHandler$1.handleMessage(AsyncHttpResponseHandler.java:85) 12-21 01:01:11.180: E/AndroidRuntime(28502): at android.os.Handler.dispatchMessage(Handler.java:99) 12-21 01:01:11.180: E/AndroidRuntime(28502): at android.os.Looper.loop(Looper.java:150) 12-21 01:01:11.180: E/AndroidRuntime(28502): at android.app.ActivityThread.main(ActivityThread.java:4263) 12-21 01:01:11.180: E/AndroidRuntime(28502): at java.lang.reflect.Method.invokeNative(Native Method) 12-21 01:01:11.180: E/AndroidRuntime(28502): at java.lang.reflect.Method.invoke(Method.java:507) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 12-21 01:01:11.180: E/AndroidRuntime(28502): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-21 01:01:11.180: E/AndroidRuntime(28502): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Yikes! I tried to post a "snippet" but maybe I should've posted the complete file...</p>
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