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POHow do I start an Intent from an OnClickListener
 

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  1. POHow do I start an Intent from an OnClickListener
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    <p>My Main Activity extends ListActivity and displays a List. I am using custom Listitems defined in a class named DefinitionAdapter. I also have a seperate class that implements OnClickListener.</p> <p>In the class DefinitionAdapter I set the OnClickListener to the ListItems:</p> <pre><code> public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; if (v == null) { LayoutInflater vi = (LayoutInflater)getContext().getSystemService( Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.row, null); } ... v.setOnClickListener(new OnItemClickListener(position) ); return v; } </code></pre> <p>My custom OnClickListener is supposed to start another activity. </p> <pre><code>public class OnItemClickListener implements OnClickListener extends Activity { private int position; public OnItemClickListener(int p) { position = p; } @Override public void onClick(View v) { Intent intent = new Intent(this, ShowDefinition.class); startActivity(intent); } } </code></pre> <p>I am not sure that I am doing that right. I added my new activity to the manifest, as well as the activity i extended the listener with:</p> <pre><code>&lt;activity android:name="ShowDefinition" android:label="@string/app_name"&gt; &lt;/activity&gt; &lt;activity android:name="OnItemClickListener" android:label="@string/app_name"&gt; &lt;/activity&gt; </code></pre> <p>Nonetheless, if I click on an Item in my List, the application always breaks with a NullPointerException. I think I am using the intent wrong... any Ideas?</p> <p>In regard to Nikita Beloglazov's comment:</p> <p>It breaks when I create the Intent:</p> <pre><code>Intent intent = new Intent(this, ShowDefinition.class); </code></pre> <p>Here's the stacktrace:</p> <pre><code>05-23 22:56:46.629: ERROR/AndroidRuntime(258): Uncaught handler: thread main exiting due to uncaught exception 05-23 22:56:46.659: ERROR/AndroidRuntime(258): java.lang.NullPointerException 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:120) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.content.ComponentName.&lt;init&gt;(ComponentName.java:75) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.content.Intent.&lt;init&gt;(Intent.java:2551) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at com.andiandy.juradefinitions.OnItemClickListener.onClick(OnItemClickListener.java:22) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.View.performClick(View.java:2364) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.View.onTouchEvent(View.java:4179) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.View.dispatchTouchEvent(View.java:3709) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:852) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.app.Activity.dispatchTouchEvent(Activity.java:2061) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.os.Handler.dispatchMessage(Handler.java:99) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.os.Looper.loop(Looper.java:123) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at android.app.ActivityThread.main(ActivityThread.java:4363) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at java.lang.reflect.Method.invokeNative(Native Method) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at java.lang.reflect.Method.invoke(Method.java:521) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-23 22:56:46.659: ERROR/AndroidRuntime(258): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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