CODEWITHSUNDEEP
androidandroid-fragmentsclasscastexceptionandroid-dialogfragmentandroid-nested-fragment
user3552715
user3552715

Reputation: 5

Android DialogFragment throws ClassCastException from getActivity()

I want to obtain the value in DialogFragment: enter a value into an EditText and change the TextView in Fragment regarding it.

My Fragment

public class MyPageActivity extends Fragment implements MyPageNicknameDialog.onNicknameListener{
...

@Override
public void setNicknameListener(String arg){
    mypage_nickname_text.setText(arg);
}
}

Dialog

public class MyPageNicknameDialog extends DialogFragment{

...

public interface onNicknameListener{
    void setNicknameListener(String arg);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){

    dialogView = inflater.inflate(R.layout.dialog_nickname_mypage, container, false);

    getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);  
    getDialog().getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 

    nickname_dialog_edittext = (EditText)dialogView.findViewById(R.id.nickname_dialog_edittext);
    nickname_dialog_edittext.requestFocus();
    nickname_dialog_edittext.setOnEditorActionListener( new OnEditorActionListener() {

        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

            // Here thorws ClasscastExeption
            onNicknameListener activity = (onNicknameListener) getActivity();
            activity.setNicknameListener(nickname_dialog_edittext.getText().toString());
            getDialog().dismiss();

            return false;
        }
    });

    //init();

    return dialogView;
}
}

The Log 

05-21 22:48:42.725: E/AndroidRuntime(17131): java.lang.ClassCastException: com.hhh.kiznic.MainFragmentActivity cannot be cast to com.hhh.kiznic.MyPageNicknameDialog$onNicknameListener
05-21 22:48:42.725: E/AndroidRuntime(17131):    at com.hhh.kiznic.MyPageNicknameDialog$1.onEditorAction(MyPageNicknameDialog.java:54)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at android.widget.TextView.onEditorAction(TextView.java:4973)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at com.android.internal.widget.EditableInputConnection.performEditorAction(EditableInputConnection.java:138)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:297)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at android.os.Looper.loop(Looper.java:137)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at android.app.ActivityThread.main(ActivityThread.java:5493)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at java.lang.reflect.Method.invokeNative(Native Method)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at java.lang.reflect.Method.invoke(Method.java:525)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
05-21 22:48:42.725: E/AndroidRuntime(17131):    at dalvik.system.NativeStart.main(Native Method)

I was find many examples but could not be resolved. If you know the cause and solution please help me.

Upvotes: 0

Views: 294

Answers (3)

einschnaehkeee
einschnaehkeee

Reputation: 1888

When you're opening a DialogFragment inside another Fragment

dialog.show(getChildFragmentManager(), "dialog");

you can get the parent fragment by getParentFragment()

So your code needs to be like this:

    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

        // Here thorws ClasscastExeption
        onNicknameListener parentFrag = (onNicknameListener) getParentFragment();
        parentFrag.setNicknameListener(nickname_dialog_edittext.getText().toString());
        getDialog().dismiss();

        return false;
    }

Upvotes: 0

Juan Reyes
Juan Reyes

Reputation: 404

Your class "MyPageActivity" is not defined as an Activity but as a Fragment. When you use the method getActivity(), you get the Activity that is hosting the Fragment "MyPageActivity" which is not implementing the interface. You must implement the interface in the Activity that is hosting the "MyPageActivity" or change "MyPageActivity" to extend an Activity.

Upvotes: 0

Blackbelt
Blackbelt

Reputation: 157437

MyPageActivity, which implements MyPageNicknameDialog.onNicknameListener, is a Fragment not an Activity. getActivity returns the Activity that hosts the Fragment. If it does not implements that interface, the ClassCastException is thrown

Upvotes: 2

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