この DialogFragment クラスを実装する方法を知りたいと思っていました:
public class MyDialogFragment extends DialogFragment {
private static final String ARG_LISTENER_TYPE = "listenerType";
private DialogListener mListener;
static enum ListenerType {
ACTIVITY, FRAGMENT
}
public interface DialogListener {
public void onDialogPositiveClick(DialogFragment dialog);
public void onDialogNegativeClick(DialogFragment dialog);
}
public static MyDialogFragment newInstance(DialogListener listener) {
final MyDialogFragment instance;
if (listener instanceof Activity) {
instance = createInstance(ListenerType.ACTIVITY);
} else if (listener instanceof Fragment) {
instance = createInstance(ListenerType.FRAGMENT);
instance.setTargetFragment((Fragment) listener, 0);
} else {
throw new IllegalArgumentException(listener.getClass() + " must be either an Activity or a Fragment");
}
return instance;
}
private static MyDialogFragment createInstance(ListenerType type) {
MyDialogFragment fragment = new MyDialogFragment();
Bundle args = new Bundle();
args.putSerializable(ARG_LISTENER_TYPE, type);
fragment.setArguments(args);
return fragment;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// TODO: Create your dialog here
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage(R.string.app_name);
builder.setPositiveButton(android.R.string.ok, new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
mListener.onDialogPositiveClick(MyDialogFragment.this);
}
});
builder.setNegativeButton(android.R.string.cancel, new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
mListener.onDialogNegativeClick(MyDialogFragment.this);
}
});
return builder.create();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// Find out how to get the DialogListener instance to send the callback
// events to
Bundle args = getArguments();
ListenerType listenerType = (ListenerType) args.getSerializable(ARG_LISTENER_TYPE);
switch (listenerType) {
case ACTIVITY: {
// Send callback events to the hosting activity
mListener = (DialogListener) activity;
break;
}
case FRAGMENT: {
// Send callback events to the "target" fragment
mListener = (DialogListener) getTargetFragment();
break;
}
}
}
@Override
public void onDetach() {
mListener = null;
}
}
次のように、フラグメントのクラスから DialogListener を実装しました。
public class MyFragment extends Fragment implements DialogListener
@Override
public void onDialogPositiveClick(DialogFragment dialog) {
// TODO Auto-generated method stub
}
@Override
public void onDialogNegativeClick(DialogFragment dialog) {
// TODO Auto-generated method stub
}
と：
MyDialogFragment dialogFragment = MyDialogFragment.newInstance(MyFragment.this);
dialogFragment.show(getFragmentManager(), getTag());
ダイアログボックスが表示されますが、ONまたはCANCELをクリックするとIllegalArgumentExceptionがスローされます
ログは次のとおりです。
02-20 22:02:57.022: E/AndroidRuntime(1997): FATAL EXCEPTION: main
02-20 22:02:57.022: E/AndroidRuntime(1997): android.app.SuperNotCalledException: Fragment MyDialogFragment{b57064f0 #1} did not call through to super.onDetach()
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:992)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.app.FragmentManagerImpl.removeFragment(FragmentManager.java:1123)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.app.BackStackRecord.run(BackStackRecord.java:592)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1382)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.os.Handler.handleCallback(Handler.java:605)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.os.Handler.dispatchMessage(Handler.java:92)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.os.Looper.loop(Looper.java:137)
02-20 22:02:57.022: E/AndroidRuntime(1997): at android.app.ActivityThread.main(ActivityThread.java:4424)
02-20 22:02:57.022: E/AndroidRuntime(1997): at java.lang.reflect.Method.invokeNative(Native Method)
02-20 22:02:57.022: E/AndroidRuntime(1997): at java.lang.reflect.Method.invoke(Method.java:511)
02-20 22:02:57.022: E/AndroidRuntime(1997): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-20 22:02:57.022: E/AndroidRuntime(1997): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-20 22:02:57.022: E/AndroidRuntime(1997): at dalvik.system.NativeStart.main(Native Method)