Question

我正在尝试创建一个自定义按钮的监听器，它扩展了DialogFragment类，我想从customdialog片段类中找到自定义按钮的监听器。但是当我尝试调用CustomDialog Fragment的视图时，我就是获得null异常。我所做的是在其他地方创建一个新的customdialog片段实例并说

customdialog.getView（）findViewById（R.id.custombutton）;

但我得到了空。

public class CustomDialog extends DialogFragment {

public  final int RES_NONE = -1;
private  TextViewCustomFont dialogTitle, view2, dialogBodyBottom,
        dialogBodyTop;
private  EditTextCustomFont dialogEditText;
private  ButtonCustomFont dialogLeftButton;
private ButtonCustomFont dialogRightButton;
private  Typeface GothamBold, GothamMedium, GothamUltra;
private static  int title1, bodyTop1, bodyBottom1, EditTextHint1,
        leftButton1, rightButton1;
onSubmitListener mListener;

private  Dialog dialog;

interface onSubmitListener {
    void setOnSubmitListener(String arg);
}

public static CustomDialog newInstance(int title, int bodyTop,
        int bodyBottom, int EditTextHint, int leftButton, int rightButton) {

    title1 = title;
    bodyTop1 = bodyTop;
    bodyBottom1 = bodyBottom;
    EditTextHint1 = EditTextHint;
    leftButton1 = leftButton;
    rightButton1 = rightButton;

    CustomDialog frag = new CustomDialog();



    return frag;
}

public ButtonCustomFont getDialogLeftButton() {
    return dialogLeftButton;
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    dialog = new Dialog(getActivity());
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    //dialog.setContentView(R.layout.dialog_layout);
    //dialog.show();

    initLayout();

    return dialog;
}

private void initLayout(){
    dialog.setContentView(R.layout.dialog_layout);
    setDialogView();
    setCustomDialog();
}

public void setDialogView(){    

    //Create an java object of each dialog view item
    dialogTitle = (TextViewCustomFont) dialog.findViewById(R.id.custom_dialog_title);
    dialogBodyTop = (TextViewCustomFont) dialog.findViewById(R.id.custom_dialog_body_top);
    dialogBodyBottom = (TextViewCustomFont) dialog.findViewById(R.id.custom_dialog_body_bottom);
    dialogEditText = (EditTextCustomFont) dialog.findViewById(R.id.custom_dialog_body_et);
    dialogLeftButton = (ButtonCustomFont) dialog.findViewById(R.id.custom_dialog_body_btn_left);
    dialogRightButton = (ButtonCustomFont)  }

public class LoginSelectionFragment extends Fragment {


public static LoginSelectionFragment newInstance() {

    LoginSelectionFragment fragment = new LoginSelectionFragment();
    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_loginselection,
            container, false);
}

我正在尝试拉出CustomDialog Fragment的dialogLeftButton并在LoginSelectionFragment内部对其进行侦听。

这是我添加方法2之后的样子。这是LoginSelectionFragment的一部分

private void TwoButtonTextEditTextDialog(){
    String title = getResources().getString(R.string.invalid_info_header);
    String body = getResources().getString(R.string.invalid_info_body);
    String body2 = getResources().getString(R.string.hint_newemail);
    String btn1 = getResources().getString(R.string.cancel_uppercase);
    String btn2 = getResources().getString(R.string.ok_alert);

    fragmentDialog = CustomDialog.newInstance(title, body, body2, RES_NONE, btn1, btn2);
    fragmentDialog.setCustomDialogFragmentListener(mDialogClickListener);
    fragmentDialog.show(getFragmentManager(), "");
}

private  CustomDialog.CustomDialogFragmentListener mDialogClickListener = new CustomDialog.CustomDialogFragmentListener(){ 

    @Override
    public void onNegativeClick() {
    // TODO Auto-generated method stub
    fragmentDialog.dismiss();
    }

    @Override
    public void onPositiveClick() {
    // TODO Auto-generated method stub
    fragmentDialog.dismiss();
    }

};


@Override
public void onNegativeClick() {
    // TODO Auto-generated method stub

}

@Override
public void onPositiveClick() {
    // TODO Auto-generated method stub

}

Answer 1

您可以创建一个方法setDialogButtonClickListener(CustomDialog.OnButtonClickListener clickListener);，其中CustomDialog.OnButtonClickListener是一个内部静态界面，这样您就可以从任何地方收听按钮的点击事件。

这方面的一个例子如下所示，

   public class CustomDialog extends DialogFragment {

       .....
     public static CustomDialog newInstance(int title, int bodyTop,
        int bodyBottom, int EditTextHint, int leftButton, int rightButton) {

        CustomDialog frag = new CustomDialog();
        Bundle args = new Bundle();
        args.putInt("title", title);
        ......
        frag.setArguments(args);
        return frag;
    }

...
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        int title = getArguments().getInt("title");

        return new AlertDialog.Builder(getActivity())
                .setIcon(android.R.drawable.ic_dialog_alert)
                .setTitle(title)
                .setPositiveButton(android.R.string.ok, this)
                .setNegativeButton(android.R.string.cancel, this)
                 ....
                .create();
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        if (listener != null) {
            switch (which) {
            case DialogInterface.BUTTON_POSITIVE:
                listener.onRightButtonClick();
            default:
                listener.onLeftButtonClick();
            }
        }
    }

    ...
    private CustomDialog.OnButtonClickListener mClickListener;
    ....

    public void setDialogButtonClickListener(CustomDialog.OnButtonClickListener clickListener){
         mClickListener = clickListener;
    }

    ...
    public static interface OnButtonClickListener {
       public void onLeftButtonClick();
       public void onRightButtonClick();
    }
    }

如果您从我上面发布的上述示例中注意到，除了解决您在按钮上设置点击监听器的问题之外，还在Android上为您介绍了工厂设计模式，您可以看到为 按钮标题和对话框标题创建static字段 我已将它们设置在捆绑参数中，然后将其检索到对话框onCreate（）方法。

有关片段的更多最佳做法您可以查看here

修改

好的，为了您的帮助，我向您提供了一个您的LoginSelectionFragment应该是什么样子的一瞥。

public class LoginSelectionFragment extends Fragment implements CustomDialog.OnButtonClickListener { ......// Method 1 public void showDialog(String title , String message .....) { CustomDialog dialog = CustomDialog.getInstance(title , message...); dialog.setDialogButtonClickListener(this); dialog.show(getSupportFragmentManager(), null); } public void onLeftButtonClick(){ ...// do something on left button click of dialog } public void onRightButtonClick(){ // do something on right button click of dialog .. } // Method 2 public void showDialog2(String title , String message .....) { CustomDialog dialog = CustomDialog.getInstance(title , message...); dialog.setDialogButtonClickListener(mDialogClickListener); dialog.show(getSupportFragmentManager(), null); } private final CustomDialog.OnButtonClickListener mDialogClickListener = new CustomDialog.OnButtonClickListener() { public void onLeftButtonClick(){ ...// do something on left button click of dialog } public void onRightButtonClick(){ // do something on right button click of dialog .. } } }

现在，如果您查看方法1 ，我们已经为showDialog（）方法提供了参数，以便您可以 重复使用 来显示多个使用不同参数的时间即。，当您想要显示具有不同标题，消息等的相同对话框时，您可以使用此方法

并且在方法2 中，我们提供了一个匿名内部类，用于处理点击事件，您可以使用尽可能多的匿名内部类，因为您有不同类型的对话框，即具有不同UI和不同事件侦听器的对话框相同的活动/片段。

享受！

Answer 2

尝试使用它，（没有测试这个）公共类MyDialogFragment扩展了DialogFragment {

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setMessage(R.string.input_warning)
            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.dismiss();
                }
            });

    return builder.create();
    }
}

并在活动片段

中

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

    View view = inflater.inflate(R.layout.workout_a_fragment, container, false);

    Button button = (Button)view.findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        FragmentManager fm = getActivity().getFragmentManager();
        MyDialogFragment dialog = new MyDialogFragment();
        dialog.show(fm, DIALOG_WARNING);
    }

}）;}

在Android中创建一个CustomDialog的监听器

2 个答案: