DialogFragmentのベースクラス

DialogFragmentBase.java

public class DialogFragmentBase extends DialogFragment {
 
    public interface OnDialogActionListerner {
 
        void onPositiveButtonClicked();
 
        void onNegativeButtonClicked();
    }
 
    public static class Builder {
 
        // ActivityかFragmentどちらかは必ずInputさせる
        final AppCompatActivity mActivity;
 
        final Fragment mFragment;
 
        public static final String BUNDLE_KEY_TITLE = "title";
        public static final String BUNDLE_KEY_MESSAGE = "message";
        public static final String BUNDLE_KEY_POSITIVE_LABEL = "positive_label";
        public static final String BUNDLE_KEY_NEGATIVE_LABEL = "negative_label";
 
 
        private String mTitle;
 
        private String mMessage;
 
        private String mPositiveButtonLabel;
 
        private String mNeagtiveButtonLabel;
 
        public <A extends AppCompatActivity & OnDialogActionListerner> Builder(AppCompatActivity activity) {
            mActivity = activity;
            mFragment = null;
        }
 
        public <F extends Fragment & OnDialogActionListerner> Builder(F fragment) {
            mActivity = null;
            mFragment = fragment;
        }
 
 
        public Builder setTitle(String title) {
            mTitle = title;
            return this;
        }
 
        // 他のケース作ってないけど、同じ形式でResからの入力サポートできる
        public Builder setTitle(int resId) {
            return setTitle(getContext().getResources().getString(resId));
        }
 
        public Builder setMessage(String message) {
            mMessage = message;
            return this;
        }
 
        public Builder setPositiveButtonLabel(String positiveButtonLabel) {
            mPositiveButtonLabel = positiveButtonLabel;
            return this;
        }
 
        public Builder setNeagtiveButtonLabel(String neagtiveButtonLabel) {
            mNeagtiveButtonLabel = neagtiveButtonLabel;
            return this;
        }
 
        public DialogFragmentBase build(){
            if(mTitle == null){
                return null;
            }
 
            Bundle bundle = new Bundle();
            bundle.putString(BUNDLE_KEY_TITLE, mTitle);
            bundle.putString(BUNDLE_KEY_MESSAGE, mMessage);
            bundle.putString(BUNDLE_KEY_POSITIVE_LABEL, mPositiveButtonLabel);
            bundle.putString(BUNDLE_KEY_NEGATIVE_LABEL, mNeagtiveButtonLabel);
 
            DialogFragmentBase fragment = new DialogFragmentBase();
            fragment.setArguments(bundle);
 
            return fragment;
        }
 
        private Context getContext() {
            return (mActivity != null ? mActivity : mFragment.getActivity())
                    .getApplicationContext();
        }
    }
 
    private OnDialogActionListerner mListener;
 
 
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if(getActivity() instanceof OnDialogActionListerner){
            mListener = (OnDialogActionListerner)getActivity();
        }else if(getParentFragment() instanceof OnDialogActionListerner){
            mListener = (OnDialogActionListerner)getParentFragment();
        }
    }
 
    @Override
    public void onDetach() {
        mListener = null;
        super.onDetach();
    }
 
 
    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Bundle bundle = getArguments();
 
        // DialogのLayoutを変更したいのであれば、ここでinflateする
 
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
 
        if(bundle.getString(Builder.BUNDLE_KEY_TITLE) != null){
            dialogBuilder.setTitle(bundle.getString(Builder.BUNDLE_KEY_TITLE));
        }
 
        if(bundle.getString(Builder.BUNDLE_KEY_MESSAGE) != null){
            dialogBuilder.setMessage(bundle.getString(Builder.BUNDLE_KEY_MESSAGE));
        }
        if(bundle.getString(Builder.BUNDLE_KEY_POSITIVE_LABEL) != null){
            dialogBuilder.setPositiveButton(bundle.getString(Builder.BUNDLE_KEY_POSITIVE_LABEL),
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
 
                        }
                    });
        }
 
        if(bundle.getString(Builder.BUNDLE_KEY_NEGATIVE_LABEL) != null){
            dialogBuilder.setNegativeButton(bundle.getString(Builder.BUNDLE_KEY_NEGATIVE_LABEL),
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
 
                        }
                    });
        }
 
        return dialogBuilder.create();
    }
}