Injecting EventManager into a ImageButton and getting null pointer exception

[Alexander Koch]

Hello,

I am new to RoboGuice so maybe I am misunderstanding something. I am using the EventManager to notify my Action and this works well from a RoboListFragment with @Inject. 

But I am having trouble using it in a class that extends ImageButton. I want to have an ImageButton that fires an event when clicked which contains the buttons id:

public class AddItemButton extends ImageButton implements OnClickListener {
  @Inject
  private EventManager eventManager;
 
  public AddItemButton(Context context) {
    super(context);
    setOnClickListener(this);
  }
 
  public AddItemButton(Context ctx, AttributeSet attrs) {
    super(ctx, attrs);
    setOnClickListener(this);
  }

 @Override
 public void onClick(View view) {
   eventManager.fire(new ButtonClickEvent(getId()));
 }
}

But this gives me a null pointer exception because eventManager is null. 

08-08 19:11:41.262: E/AndroidRuntime(20272): java.lang.NullPointerException

08-08 19:11:41.262: E/AndroidRuntime(20272): at org.ak80.alar.view.AddItemButton.onClick(AddItemButton.java:36)

08-08 19:11:41.262: E/AndroidRuntime(20272): at android.view.View.performClick(View.java:4438)

08-08 19:11:41.262: E/AndroidRuntime(20272): at android.view.View$PerformClick.run(View.java:18422)

08-08 19:11:41.262: E/AndroidRuntime(20272): at android.os.Handler.handleCallback(Handler.java:733)

08-08 19:11:41.262: E/AndroidRuntime(20272): at android.os.Handler.dispatchMessage(Handler.java:95)

08-08 19:11:41.262: E/AndroidRuntime(20272): at android.os.Looper.loop(Looper.java:136)

08-08 19:11:41.262: E/AndroidRuntime(20272): at android.app.ActivityThread.main(ActivityThread.java:5001)

08-08 19:11:41.262: E/AndroidRuntime(20272): at java.lang.reflect.Method.invokeNative(Native Method)

08-08 19:11:41.262: E/AndroidRuntime(20272): at java.lang.reflect.Method.invoke(Method.java:515)

08-08 19:11:41.262: E/AndroidRuntime(20272): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)

08-08 19:11:41.262: E/AndroidRuntime(20272): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)

08-08 19:11:41.262: E/AndroidRuntime(20272): at dalvik.system.NativeStart.main(Native Method)

I think it maybe that EventManager is missing the Context / Activity. Can someone please help me to understand how to achieve my goal?

[Mike Burton]

This may be helpful:

https://github.com/roboguice/roboguice/wiki/Injected-Custom-Views

http://about.me/michaelburton

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[Alexander Koch]

Indeed it was. I feel stupid, I had no

  RoboGuice.getInjector(getContext()).injectMembers(this);

 

Thank you for your quick reply!

[Mike Burton]

No problem, it’s a limitation of the way we hook into views.  Normally you shouldn’t need to call roboguice manually yourself, but for views you currently do.

http://about.me/michaelburton

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