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POdynamic lazylist
 

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    <p>Hello everyone i want to make <a href="https://stackoverflow.com/questions/541966/android-how-do-i-do-a-lazy-load-of-images-in-listview/3068012#3068012">this</a> Lazylist dynamic . i have tried with images first buts its coming with force to close . Please guide if my approach is wrong. Here is code </p> <pre><code>public class Test extends Activity { ListView list; LazyAdapter adapter; private String[] mStrings; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ArrayList&lt;String&gt; listItems = new ArrayList&lt;String&gt;(); try { URL twitter = new URL( "http://midsweden.gofreeserve.com/proj/androidjson.php?identifier=123"); URLConnection tc = twitter.openConnection(); BufferedReader in = new BufferedReader(new InputStreamReader( tc.getInputStream())); String line; while ((line = in.readLine()) != null) { JSONArray ja = new JSONArray(line); for (int i = 0; i &lt; ja.length(); i++) { JSONObject jo = (JSONObject) ja.get(i); listItems.add(jo.getString("http://midsweden.gofreeserve.com/proj/admin/pictures/file87619.jpg")); } } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } mStrings = listItems.toArray(new String[listItems.size()]); list=(ListView)findViewById(R.id.list); adapter=new LazyAdapter(this, mStrings); list.setAdapter(adapter); Button b=(Button)findViewById(R.id.button1); b.setOnClickListener(listener); } @Override public void onDestroy() { adapter.imageLoader.stopThread(); list.setAdapter(null); super.onDestroy(); } public OnClickListener listener=new OnClickListener(){ public void onClick(View arg0) { adapter.imageLoader.clearCache(); adapter.notifyDataSetChanged(); } }; } </code></pre> <p>logcat</p> <pre><code>07-09 01:00:51.825: WARN/dalvikvm(12674): threadid=3: thread exiting with uncaught exception (group=0x4001e390) 07-09 01:00:51.835: ERROR/AndroidRuntime(12674): Uncaught handler: thread main exiting due to uncaught exception 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.droidnova.android.howto.optionmenu/com.droidnova.android.howto.optionmenu.Test}: java.lang.NullPointerException 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.ActivityThread.access$2200(ActivityThread.java:126) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.os.Handler.dispatchMessage(Handler.java:99) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.os.Looper.loop(Looper.java:123) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.ActivityThread.main(ActivityThread.java:4595) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at java.lang.reflect.Method.invokeNative(Native Method) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at java.lang.reflect.Method.invoke(Method.java:521) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at dalvik.system.NativeStart.main(Native Method) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): Caused by: java.lang.NullPointerException 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at com.droidnova.android.howto.optionmenu.LazyAdapter.getCount(LazyAdapter.java:27) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.widget.ListView.setAdapter(ListView.java:431) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at com.droidnova.android.howto.optionmenu.Test.onCreate(Test.java:35) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) 07-09 01:00:51.865: ERROR/AndroidRuntime(12674): ... 11 more 07-09 01:00:51.895: INFO/Process(82): Sending signal. PID: 12674 SIG: 3 07-09 01:00:51.895: INFO/dalvikvm(12674): threadid=7: reacting to signal 3 </code></pre>
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