Attaching Fragment to Activity with AndroidAnnotations?

Question

How can I attach a Fragment to an Activity with AndroidAnnotations?

I have a Activity with a layout XML. I also have a Fragment with a layout XML.

How do I connect the Fragment to the Activity? The Fragment and its content/layout should be displayed inside the <fragment ...> tag of the Activity layout XML file.

Here are my classes and their respective XML layouts (trimmed down for better readability):

@EActivity(R.layout.activity_add_contact)
public class AddContactActivity extends AppCompatActivity {

    private final String TAG = getClass().getSimpleName();

    @FragmentById(R.id.add_contact_fragment)
    AddContactFragment addContactFragment;

    @Extra
    String contactName;

    @ViewById(R.id.toolbar)
    Toolbar toolbar;

    @AfterViews
    void createView() {
        setSupportActionBar(toolbar);

        setTitle(getString(R.string.new_contact_title, contactName.trim()));

    }

}

actvitiy_add_contact.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".AddContactActivity_">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <fragment
        android:id="@+id/add_contact_fragment"
        android:name="net.gazeapp.AddContactFragment_"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</android.support.design.widget.CoordinatorLayout>

And here is the Fragment:

@EFragment(R.layout.fragment_add_contact)
public class AddContactFragment extends Fragment implements DatePickerDialog.OnDateSetListener {
    private final String TAG = getClass().getSimpleName();

    @ViewById(R.id.nickname)
    EditText nickname;

    @ViewById(R.id.birthdate)
    EditText birthdate;

    public AddContactFragment() {
    }

    @AfterViews
    public void onCreateView() {
        // Hide Keyboard initially
        getActivity().getWindow().setSoftInputMode(
                WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN
        );
    }
}

and its XML layout:

fragment_add_contact.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/scrollView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:fillViewport="true"
    android:overScrollMode="never"
    android:theme="@style/MyEditTextTheme">

<!-- FRAGMENT LAYOUT / INPUT FIELDS ETC -->

</ScrollView>

It is unclear to me how I can get the Fragment into the <fragment> tag in the Activity. When I run it with the code above I get this error message:

02-22 21:26:05.689 16267-16267/net.gazeapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.gazeapp, PID: 16267
java.lang.RuntimeException: Unable to start activity ComponentInfo{net.gazeapp/net.gazeapp.AddContactActivity_}: android.view.InflateException: Binary XML file line #24: Binary XML file line #24: Error inflating class fragment
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
 at android.app.ActivityThread.-wrap11(ActivityThread.java)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:148)
 at android.app.ActivityThread.main(ActivityThread.java:5417)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.view.InflateException: Binary XML file line #24: Binary XML file line #24: Error inflating class fragment
 at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
 at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
 at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
 at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
 at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
 at net.gazeapp.AddContactActivity_.setContentView(AddContactActivity_.java:55)
 at net.gazeapp.AddContactActivity_.onCreate(AddContactActivity_.java:44)
 at android.app.Activity.performCreate(Activity.java:6251)
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
 at android.app.ActivityThread.-wrap11(ActivityThread.java) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:148) 
 at android.app.ActivityThread.main(ActivityThread.java:5417) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
 at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
 at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
 at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
 at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
 at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
 at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
 at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
 at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256) 
 at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109) 
 at net.gazeapp.AddContactActivity_.setContentView(AddContactActivity_.java:55) 
 at net.gazeapp.AddContactActivity_.onCreate(AddContactActivity_.java:44) 
 at android.app.Activity.performCreate(Activity.java:6251) 
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
 at android.app.ActivityThread.-wrap11(ActivityThread.java) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:148) 
 at android.app.ActivityThread.main(ActivityThread.java:5417) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: java.lang.ClassCastException: net.gazeapp.AddContactActivity_@cba10e4 must implement MyListFragment.OnContactObjectChangedListener
 at net.gazeapp.AddContactFragment.onAttach(AddContactFragment.java:161)
 at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1019)
 at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1226)
 at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1328)
 at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2284)
 at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
 at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:314)
 at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:31)
 at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:79)
 at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:754)
 at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 
 at android.view.LayoutInflater.rInflate(LayoutInflater.java:835) 
 at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) 
 at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
 at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
 at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
 at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256) 
 at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109) 
 at net.gazeapp.AddContactActivity_.setContentView(AddContactActivity_.java:55) 
 at net.gazeapp.AddContactActivity_.onCreate(AddContactActivity_.java:44) 
 at android.app.Activity.performCreate(Activity.java:6251) 
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
 at android.app.ActivityThread.-wrap11(ActivityThread.java) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:148) 
 at android.app.ActivityThread.main(ActivityThread.java:5417) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Thanks for any help.

Answer 1

The problem lies here:

Caused by: java.lang.ClassCastException: net.gazeapp.AddContactActivity_@cba10e4 must implement MyListFragment.OnContactObjectChangedListener
 at net.gazeapp.AddContactFragment.onAttach(AddContactFragment.java:161)

You did not share AddContactFragment.onAttach() method in your question, but it seems you are casting the Activity to an OnContactObjectChangedListener. However, the Activity is not implementing that interface, that is why you are getting this exception.