title: Crash after adding footer to ListView
body: <p>I'm trying to add footer to <code>ListView</code> but application crashes after this line of code: <code>getListView().addView(footerView);</code>. I'm new to android and this is my first experience with <code>ListView</code>.</p>
  
  <p>If is possible I need short explanation of inflate method.</p>
  
  <p>Thanks!</p>
  
  <pre><code>  ToDoListAdapter mAdapter;
  
          @Override
          public void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
  
              // Create a new TodoListAdapter for this ListActivity's ListView
              mAdapter = new ToDoListAdapter(getApplicationContext());
  
              // Put divider between ToDoItems and FooterView
              getListView().setFooterDividersEnabled(true);
  
              //TODO - Inflate footerView for footer_view.xml file
              TextView footerView = (TextView) getLayoutInflater().inflate(R.layout.footer_view, null);
  
              //TODO - Add footerView to ListView
              getListView().addView(footerView);
  
              footerView.setOnClickListener(new OnClickListener() {
                  @Override
                  public void onClick(View v) {
  
                      log("Entered footerView.OnClickListener.onClick()");
  
                      //TODO - Attach Listener to FooterView. Implement onClick().
                      Intent startNewActivity = new Intent(null, AddToDoActivity.class);
                      startActivityForResult(startNewActivity, ADD_TODO_ITEM_REQUEST);
  
                  }
              });
  
              //TODO - Attach the adapter to this ListActivity's ListView
              setListAdapter(mAdapter);
  
          }
  </code></pre>
  
  <p><strong>Log:</strong></p>
  
  <pre><code>02-19 13:53:39.358: D/dalvikvm(1451): GC_FOR_ALLOC freed 68K, 6% free 3090K/3276K, paused 19ms, total 31ms
  02-19 13:53:39.366: I/dalvikvm-heap(1451): Grow heap (frag case) to 4.196MB for 1127532-byte allocation
  02-19 13:53:39.374: D/dalvikvm(1451): GC_FOR_ALLOC freed 2K, 5% free 4189K/4380K, paused 8ms, total 8ms
  02-19 13:53:39.402: D/AndroidRuntime(1451): Shutting down VM
  02-19 13:53:39.402: W/dalvikvm(1451): threadid=1: thread exiting with uncaught exception (group=0xa4d4db20)
  02-19 13:53:39.414: E/AndroidRuntime(1451): FATAL EXCEPTION: main
  02-19 13:53:39.414: E/AndroidRuntime(1451): Process: course.labs.todomanager, PID: 1451
  02-19 13:53:39.414: E/AndroidRuntime(1451): java.lang.RuntimeException: Unable to start activity ComponentInfo{course.labs.todomanager/course.labs.todomanager.ToDoManagerActivity}: java.lang.UnsupportedOperationException: addView(View) is not supported in AdapterView
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.os.Handler.dispatchMessage(Handler.java:102)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.os.Looper.loop(Looper.java:136)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.ActivityThread.main(ActivityThread.java:5017)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at java.lang.reflect.Method.invokeNative(Native Method)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at java.lang.reflect.Method.invoke(Method.java:515)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at dalvik.system.NativeStart.main(Native Method)
  02-19 13:53:39.414: E/AndroidRuntime(1451): Caused by: java.lang.UnsupportedOperationException: addView(View) is not supported in AdapterView
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.widget.AdapterView.addView(AdapterView.java:452)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at course.labs.todomanager.ToDoManagerActivity.onCreate(ToDoManagerActivity.java:56)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.Activity.performCreate(Activity.java:5231)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
  02-19 13:53:39.414: E/AndroidRuntime(1451):     ... 11 more
  </code></pre>
  
  <p><strong>Edit:</strong></p>
  
  <p>Thanks, fixed that problem but now I it seems there is issue somewhere in click listener.</p>
  
  <p>Log:</p>
  
  <pre><code>02-19 14:19:02.346: I/Lab-UserInterface(1731): Entered footerView.OnClickListener.onClick()
  02-19 14:19:02.346: D/AndroidRuntime(1731): Shutting down VM
  02-19 14:19:02.346: W/dalvikvm(1731): threadid=1: thread exiting with uncaught exception (group=0xa4d4db20)
  02-19 14:19:02.350: E/AndroidRuntime(1731): FATAL EXCEPTION: main
  02-19 14:19:02.350: E/AndroidRuntime(1731): Process: course.labs.todomanager, PID: 1731
  02-19 14:19:02.350: E/AndroidRuntime(1731): java.lang.NullPointerException
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.content.ComponentName.&lt;init&gt;(ComponentName.java:77)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.content.Intent.&lt;init&gt;(Intent.java:3813)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at course.labs.todomanager.ToDoManagerActivity$1.onClick(ToDoManagerActivity.java:65)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.view.View.performClick(View.java:4438)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.view.View$PerformClick.run(View.java:18422)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.os.Handler.handleCallback(Handler.java:733)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.os.Handler.dispatchMessage(Handler.java:95)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.os.Looper.loop(Looper.java:136)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at android.app.ActivityThread.main(ActivityThread.java:5017)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at java.lang.reflect.Method.invokeNative(Native Method)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at java.lang.reflect.Method.invoke(Method.java:515)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
  02-19 14:19:02.350: E/AndroidRuntime(1731):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>