我正在尝试创建扩展 DialogFragment 类的自定义对话框按钮的监听器，并且我想在自定义对话框 fragment 类中找到自定义按钮的监听器。但是，当我尝试调用 CustomDialog Fragment 的 View 时，我是得到空异常。我所做的是在其他地方创建自定义对话框 fragment 的新实例并说
customdialog.getView().findViewById(R.id.custombutton);
但我变得空了。
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);
}
我正在尝试拉取 CustomDialog Fragment 的dialogLeftButton 并在 LoginSelectionFragment 内为其设置监听器。
这是我添加方法 2 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
}
最佳答案
您可以创建一个方法 setDialogButtonClickListener(CustomDialog.OnButtonClickListener clickListener); 其中 CustomDialog.OnButtonClickListener 是一个内部静态接口(interface)，这样您就可以监听任何地方的按钮。
示例如下所示，
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();
}
}
如果您从我发布的上述示例中注意到，我除了解决您在按钮上设置点击监听器的问题之外，还向您介绍了 Android 上的工厂设计模式，您可以看到为按钮标题和对话框标题创建静态字段，我已将它们设置在 bundle 参数中，然后在对话框的 onCreate() 方法中检索它们。
更多Fragment最佳实践可以看here
编辑
好的，为了给您提供帮助，我向您提供了 LoginSelectionFragment 的外观。
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，我们已为 showDialog() 方法提供了参数，以便您可以重用它来显示多个有时使用不同的参数，即，当您想显示具有不同标题、消息等的相同对话框时，可以使用此方法
在方法2中，我们提供了一个匿名内部类来处理点击事件，您可以使用尽可能多的匿名内部类，因为您有不同种类的对话框，即具有不同UI和不同事件监听器的对话框相同的 Activity/fragment 。
享受吧!
关于android - 在 Android 中的类之外创建 CustomDialog 的监听器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26874538/