创建自定义AlertDialog生成器并更改标题和消息的字体

Question

我创建了一个Custom AlertDialog Builder，我需要在alertdialog中更改标题和消息的字体，但是无法通过以下方式实现此目的。

custom alert dialog builder.Java :

public class CustomAlertDialogBuilder extends AlertDialog.Builder {

    public CustomAlertDialogBuilder(Context context) {
        super(context);
        TextView title = (TextView) create().getWindow().findViewById(R.id.alertTitle);
        TextView message = (TextView) create().getWindow().findViewById(android.R.id.message);

        myTypeface = Typeface.createFromAsset(getContext().getAssets(), "fonts/my_font.ttf");
        title.setTypeface(myTypeface);
        message.setTypeface(myTypeface);
    }
}

事实上，TextView是空的。如何定义TextView？我是初学者，请帮我用create custom alertdialog更改alertdialog的字体。

Answer 1

我经常使用自定义对话框，所以我使用DialogFragment。请注意，此对话框具有“确定”和“取消”按钮。如果不需要，可以删除按钮。

您需要为Custom DialogFragment“fragment_submit_cancel_dialog”创建XML布局。创建自己的设计的能力为您的对话框外观提供了极大的灵活性。

在您调用DialogFragment的Activity中，您需要添加以下内容：

implements  OkCancelDialogFragment.OkCancelDialogListener{

并添加监听器方法：

@Override
public void onFinishOkCancelDialog(boolean submit) {
    if(submit){
        // Do what you need here
    }
}

像这样打电话给DialogFragment：

private void startOkDialog(){
    String title = "What ever you want as a Title";
    String mess = "Your Message!";
    OkCancelDialogFragment dialog = OkCancelDialogFragment.newInstance(title, mess);
    show(getFragmentManager(), "OkDialogFragment");
}

现在自定义对话框片段的代码：

public class OkCancelDialogFragment extends DialogFragment {

    private static final String ARG_TITLE = "title";
    private static final String ARG_MESSAGE = "message";

    Context context = null;

    private String title;
    private String message;
    private boolean submitData = false;

    private OkCancelDialogListener mListener;

    public OkCancelDialogFragment() {
    }

    public static OkCancelDialogFragment newInstance(String title, String message) {
        OkCancelDialogFragment fragment = new OkCancelDialogFragment();
        Bundle args = new Bundle();
        args.putString(ARG_TITLE, title);
        args.putString(ARG_MESSAGE, message);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            title = getArguments().getString(ARG_TITLE);
            message = getArguments().getString(ARG_MESSAGE);
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle saveIntsanceState){

        context = getActivity();

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        LayoutInflater inflater = getActivity().getLayoutInflater();

        View rootView = inflater.inflate(R.layout.fragment_submit_cancel_dialog, null, false);
        final TextView titleView = (TextView)rootView.findViewById(R.id.tvTitle);
        final TextView messView = (TextView)rootView.findViewById(R.id.tvMessage);

        titleView.setText(title);
        messView.setText(message);

        builder.setView(rootView)
                .setPositiveButton(R.string.button_Ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        submitData = true;
                        //The onDetach will call the Listener! Just in case the user taps the back button
                    }
                })
                .setNegativeButton(R.string.button_cancel, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        submitData = false;
                    }
                });
        return builder.create();
    }


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        try {
            if(mListener == null) mListener = (OkCancelDialogListener) context;
        }
        catch (Exception ex){
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener.onFinishOkCancelDialog(submitData);
        mListener = null;
    }


    public interface OkCancelDialogListener {
        void onFinishOkCancelDialog(boolean submit);
    }

}