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POLaunch an Activity from a custom listview
 

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  1. POLaunch an Activity from a custom listview
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    <p>I'm trying to launch an activity from a custom lisview. I have hoded the onItemclick method nd called the class by creating a new intent! </p> <pre><code>public void onItemClick(AdapterView&lt;?&gt; arg0, View arg1, int position, long arg3) { if (position == 0) { Intent i = new Intent(getApplicationContext(), InstalledApps.class); startActivity(i); } } </code></pre> <p>but when I try to launch it, it gives me a nullpointer exception. what I'm trying to do is, get the position of the clicked item and direct it to the correct activity by an if clause. the following is the log cat output.</p> <pre><code>07-05 04:39:52.718: W/dalvikvm(3189): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 07-05 04:39:52.758: E/AndroidRuntime(3189): FATAL EXCEPTION: main 07-05 04:39:52.758: E/AndroidRuntime(3189): java.lang.NullPointerException 07-05 04:39:52.758: E/AndroidRuntime(3189): at com.sliit.droidman.thirdpartyapplist.ListViewAdapter.getView(ListViewAdapter.java:69) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.AbsListView.obtainView(AbsListView.java:2267) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.ListView.measureHeightOfChildren(ListView.java:1244) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.ListView.onMeasure(ListView.java:1156) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.View.measure(View.java:15172) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.View.measure(View.java:15172) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.View.measure(View.java:15172) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.View.measure(View.java:15172) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 07-05 04:39:52.758: E/AndroidRuntime(3189): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.View.measure(View.java:15172) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.Choreographer.doCallbacks(Choreographer.java:555) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.Choreographer.doFrame(Choreographer.java:525) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.os.Handler.handleCallback(Handler.java:615) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.os.Handler.dispatchMessage(Handler.java:92) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.os.Looper.loop(Looper.java:137) 07-05 04:39:52.758: E/AndroidRuntime(3189): at android.app.ActivityThread.main(ActivityThread.java:4745) 07-05 04:39:52.758: E/AndroidRuntime(3189): at java.lang.reflect.Method.invokeNative(Native Method) 07-05 04:39:52.758: E/AndroidRuntime(3189): at java.lang.reflect.Method.invoke(Method.java:511) 07-05 04:39:52.758: E/AndroidRuntime(3189): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 07-05 04:39:52.758: E/AndroidRuntime(3189): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 07-05 04:39:52.758: E/AndroidRuntime(3189): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>please let me know what I'm doing wrong here! </p> <p>the adapter class.</p> <pre><code> package com.sliit.droidman.thirdpartyapplist; import com.sliit.droidman.R; import android.app.Activity; import android.graphics.drawable.Drawable; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class ListViewAdapter extends BaseAdapter { Activity context; String title[]; String description[]; Drawable icon[]; public ListViewAdapter(Activity context, String[] title, String[] description , Drawable[] ico) { super(); this.context = context; this.title = title; this.description = description; this.icon = ico; } public int getCount() { // TODO Auto-generated method stub return title.length; } public Object getItem(int position) { // TODO Auto-generated method stub return null; } public long getItemId(int position) { // TODO Auto-generated method stub return 0; } private class ViewHolder { TextView txtViewTitle; TextView txtViewDescription; ImageView image; } public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder; LayoutInflater inflater = context.getLayoutInflater(); if (convertView == null) { convertView = inflater.inflate(R.layout.listitem_row, null); holder = new ViewHolder(); holder.txtViewTitle = (TextView) convertView.findViewById(R.id.appname); holder.txtViewDescription = (TextView) convertView.findViewById(R.id.packagename); holder.image = (ImageView) convertView.findViewById(R.id.avatar); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.txtViewTitle.setText(title[position]); holder.txtViewDescription.setText(description[position]); holder.image.setImageDrawable(icon[position]); return convertView; } } </code></pre>
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    1. PTQuestion
    1. USImesh Chandrasiri
    1. USImesh Chandrasiri
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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    1. This table or related slice is empty.
    1. COpost your getView(ListViewAdapter.java:69) method and class..
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      1. POLaunch an Activity from a custom listview
      1. USMd Abdul Gafur
    2. COI added it! nd I cant see there is an error in the adapter class! :(
      singulars
      1. POLaunch an Activity from a custom listview
      1. USImesh Chandrasiri
    3. COSpecify please the exact line of code that gives the exception, this will make the issue a lot more clear.
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      1. POLaunch an Activity from a custom listview
      1. USEgor
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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