我有一个对话框与EditText进行输入。当我单击对话框上的“是”按钮时，它将验证输入，然后关闭对话框。但是，如果输入错误，我希望保持在同一对话框中。每次无论输入是什么，当我单击“否”按钮时，对话框都会自动关闭。如何禁用此功能？顺便说一句，我在对话框中使用了PositiveButton和NegativeButton。
当前回答
它可以用最简单的方法构建：
带有自定义视图和两个按钮（正和负）的警报对话框。
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()).setTitle(getString(R.string.select_period));
builder.setPositiveButton(getString(R.string.ok), null);
builder.setNegativeButton(getString(R.string.cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Click of Cancel Button
}
});
LayoutInflater li = LayoutInflater.from(getActivity());
View promptsView = li.inflate(R.layout.dialog_date_picker, null, false);
builder.setView(promptsView);
DatePicker startDatePicker = (DatePicker)promptsView.findViewById(R.id.startDatePicker);
DatePicker endDatePicker = (DatePicker)promptsView.findViewById(R.id.endDatePicker);
final AlertDialog alertDialog = builder.create();
alertDialog.show();
Button theButton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
theButton.setOnClickListener(new CustomListener(alertDialog, startDatePicker, endDatePicker));
警报日志正面按钮的CustomClickLister：
private class CustomListener implements View.OnClickListener {
private final Dialog dialog;
private DatePicker mStartDp, mEndDp;
public CustomListener(Dialog dialog, DatePicker dS, DatePicker dE) {
this.dialog = dialog;
mStartDp = dS;
mEndDp = dE;
}
@Override
public void onClick(View v) {
int day1 = mStartDp.getDayOfMonth();
int month1= mStartDp.getMonth();
int year1 = mStartDp.getYear();
Calendar cal1 = Calendar.getInstance();
cal1.set(Calendar.YEAR, year1);
cal1.set(Calendar.MONTH, month1);
cal1.set(Calendar.DAY_OF_MONTH, day1);
int day2 = mEndDp.getDayOfMonth();
int month2= mEndDp.getMonth();
int year2 = mEndDp.getYear();
Calendar cal2 = Calendar.getInstance();
cal2.set(Calendar.YEAR, year2);
cal2.set(Calendar.MONTH, month2);
cal2.set(Calendar.DAY_OF_MONTH, day2);
if(cal2.getTimeInMillis()>=cal1.getTimeInMillis()){
dialog.dismiss();
Log.i("Dialog", "Dismiss");
// Condition is satisfied so do dialog dismiss
}else {
Log.i("Dialog", "Do not Dismiss");
// Condition is not satisfied so do not dialog dismiss
}
}
}
Done
其他回答
编辑：这只适用于一些评论中提到的API 8+。
这是一个迟到的回答，但您可以在AlertDialog中添加一个onShowListener，然后可以覆盖按钮的onClickListener。
final AlertDialog dialog = new AlertDialog.Builder(context)
.setView(v)
.setTitle(R.string.my_title)
.setPositiveButton(android.R.string.ok, null) //Set to null. We override the onclick
.setNegativeButton(android.R.string.cancel, null)
.create();
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialogInterface) {
Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// TODO Do something
//Dismiss once everything is OK.
dialog.dismiss();
}
});
}
});
dialog.show();
public class ComentarDialog extends DialogFragment{
private EditText comentario;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = LayoutInflater.from(getActivity());
View v = inflater.inflate(R.layout.dialog_comentar, null);
comentario = (EditText)v.findViewById(R.id.etxt_comentar_dialog);
builder.setTitle("Comentar")
.setView(v)
.setPositiveButton("OK", null)
.setNegativeButton("CANCELAR", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
return builder.create();
}
@Override
public void onStart() {
super.onStart();
//Obtenemos el AlertDialog
AlertDialog dialog = (AlertDialog)getDialog();
dialog.setCanceledOnTouchOutside(false);
dialog.setCancelable(false);//Al presionar atras no desaparece
//Implementamos el listener del boton OK para mostrar el toast
dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(TextUtils.isEmpty(comentario.getText())){
Toast.makeText(getActivity(), "Ingrese un comentario", Toast.LENGTH_SHORT).show();
return;
}
else{
((AlertDialog)getDialog()).dismiss();
}
}
});
//Personalizamos
Resources res = getResources();
//Buttons
Button positive_button = dialog.getButton(DialogInterface.BUTTON_POSITIVE);
positive_button.setBackground(res.getDrawable(R.drawable.btn_selector_dialog));
Button negative_button = dialog.getButton(DialogInterface.BUTTON_NEGATIVE);
negative_button.setBackground(res.getDrawable(R.drawable.btn_selector_dialog));
int color = Color.parseColor("#304f5a");
//Title
int titleId = res.getIdentifier("alertTitle", "id", "android");
View title = dialog.findViewById(titleId);
if (title != null) {
((TextView) title).setTextColor(color);
}
//Title divider
int titleDividerId = res.getIdentifier("titleDivider", "id", "android");
View titleDivider = dialog.findViewById(titleDividerId);
if (titleDivider != null) {
titleDivider.setBackgroundColor(res.getColor(R.color.list_menu_divider));
}
}
}
它可以用最简单的方法构建：
带有自定义视图和两个按钮（正和负）的警报对话框。
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()).setTitle(getString(R.string.select_period));
builder.setPositiveButton(getString(R.string.ok), null);
builder.setNegativeButton(getString(R.string.cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Click of Cancel Button
}
});
LayoutInflater li = LayoutInflater.from(getActivity());
View promptsView = li.inflate(R.layout.dialog_date_picker, null, false);
builder.setView(promptsView);
DatePicker startDatePicker = (DatePicker)promptsView.findViewById(R.id.startDatePicker);
DatePicker endDatePicker = (DatePicker)promptsView.findViewById(R.id.endDatePicker);
final AlertDialog alertDialog = builder.create();
alertDialog.show();
Button theButton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
theButton.setOnClickListener(new CustomListener(alertDialog, startDatePicker, endDatePicker));
警报日志正面按钮的CustomClickLister：
private class CustomListener implements View.OnClickListener {
private final Dialog dialog;
private DatePicker mStartDp, mEndDp;
public CustomListener(Dialog dialog, DatePicker dS, DatePicker dE) {
this.dialog = dialog;
mStartDp = dS;
mEndDp = dE;
}
@Override
public void onClick(View v) {
int day1 = mStartDp.getDayOfMonth();
int month1= mStartDp.getMonth();
int year1 = mStartDp.getYear();
Calendar cal1 = Calendar.getInstance();
cal1.set(Calendar.YEAR, year1);
cal1.set(Calendar.MONTH, month1);
cal1.set(Calendar.DAY_OF_MONTH, day1);
int day2 = mEndDp.getDayOfMonth();
int month2= mEndDp.getMonth();
int year2 = mEndDp.getYear();
Calendar cal2 = Calendar.getInstance();
cal2.set(Calendar.YEAR, year2);
cal2.set(Calendar.MONTH, month2);
cal2.set(Calendar.DAY_OF_MONTH, day2);
if(cal2.getTimeInMillis()>=cal1.getTimeInMillis()){
dialog.dismiss();
Log.i("Dialog", "Dismiss");
// Condition is satisfied so do dialog dismiss
}else {
Log.i("Dialog", "Do not Dismiss");
// Condition is not satisfied so do not dialog dismiss
}
}
}
Done
可以添加builder.show（）；在返回之前的验证消息之后；
这样地
public void login()
{
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(R.layout.login_layout);
builder.setTitle("Login");
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int id)
{
dialog.cancel();
}
});// put the negative button before the positive button, so it will appear
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int id)
{
Dialog d = (Dialog) dialog;
final EditText etUserName = (EditText) d.findViewById(R.id.etLoginName);
final EditText etPassword = (EditText) d.findViewById(R.id.etLoginPassword);
String userName = etUserName.getText().toString().trim();
String password = etPassword.getText().toString().trim();
if (userName.isEmpty() || password.isEmpty())
{
Toast.makeText(getApplicationContext(),
"Please Fill all fields", Toast.LENGTH_SHORT).show();
builder.show();// here after validation message before retrun
// it will reopen the dialog
// till the user enter the right condition
return;
}
user = Manager.get(getApplicationContext()).getUserByName(userName);
if (user == null)
{
Toast.makeText(getApplicationContext(),
"Error ethier username or password are wrong", Toast.LENGTH_SHORT).show();
builder.show();
return;
}
if (password.equals(user.getPassword()))
{
etPassword.setText("");
etUserName.setText("");
setLogged(1);
setLoggedId(user.getUserId());
Toast.makeText(getApplicationContext(),
"Successfully logged in", Toast.LENGTH_SHORT).show();
dialog.dismiss();// if every thing is ok then dismiss the dialog
}
else
{
Toast.makeText(getApplicationContext(),
"Error ethier username or password are wrong", Toast.LENGTH_SHORT).show();
builder.show();
return;
}
}
});
builder.show();
}
以下是针对所有类型对话框的一些解决方案，包括AlertDialog.Builder的解决方案，该解决方案可以在所有API级别上工作（低于API 8，而这里的另一个答案则不适用）。有使用AlertDialog.Builder、DialogFragment和DialogPreference的AlertDialog解决方案。
下面的代码示例显示了如何覆盖默认的公共按钮处理程序，并防止这些不同形式的对话框关闭对话框。所有示例都显示了如何防止肯定按钮关闭对话框。
注意：对于那些需要更多详细信息的人来说，下面的示例描述了基本android类的对话框关闭是如何在后台工作的，以及为什么选择以下方法
AlertDialog.Builder-显示后立即更改默认按钮处理程序（）
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage("Test for preventing dialog close");
builder.setPositiveButton("Test",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
//Do nothing here because we override this button later to change the close behaviour.
//However, we still need this because on older versions of Android unless we
//pass a handler the button doesn't get instantiated
}
});
final AlertDialog dialog = builder.create();
dialog.show();
//Overriding the handler immediately after show is probably a better approach than OnShowListener as described below
dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Boolean wantToCloseDialog = false;
//Do stuff, possibly set wantToCloseDialog to true then...
if(wantToCloseDialog)
dialog.dismiss();
//else dialog stays open. Make sure you have an obvious way to close the dialog especially if you set cancellable to false.
}
});
DialogFragment-重写onResume（）
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage("Test for preventing dialog close");
builder.setPositiveButton("Test",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
//Do nothing here because we override this button later to change the close behaviour.
//However, we still need this because on older versions of Android unless we
//pass a handler the button doesn't get instantiated
}
});
return builder.create();
}
//onStart() is where dialog.show() is actually called on
//the underlying dialog, so we have to do it there or
//later in the lifecycle.
//Doing it in onResume() makes sure that even if there is a config change
//environment that skips onStart then the dialog will still be functioning
//properly after a rotation.
@Override
public void onResume()
{
super.onResume();
final AlertDialog d = (AlertDialog)getDialog();
if(d != null)
{
Button positiveButton = (Button) d.getButton(Dialog.BUTTON_POSITIVE);
positiveButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Boolean wantToCloseDialog = false;
//Do stuff, possibly set wantToCloseDialog to true then...
if(wantToCloseDialog)
d.dismiss();
//else dialog stays open. Make sure you have an obvious way to close the dialog especially if you set cancellable to false.
}
});
}
}
DialogPreference-覆盖showDialog（）
@Override
protected void onPrepareDialogBuilder(Builder builder)
{
super.onPrepareDialogBuilder(builder);
builder.setPositiveButton("Test", this); //Set the button here so it gets created
}
@Override
protected void showDialog(Bundle state)
{
super.showDialog(state); //Call show on default first so we can override the handlers
final AlertDialog d = (AlertDialog) getDialog();
d.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Boolean wantToCloseDialog = false;
//Do stuff, possibly set wantToCloseDialog to true then...
if(wantToCloseDialog)
d.dismiss();
//else dialog stays open. Make sure you have an obvious way to close the dialog especially if you set cancellable to false.
}
});
}
方法说明：
通过查看Android源代码，AlertDialog默认实现通过向OnCreate（）中的所有实际按钮注册公共按钮处理程序来工作。单击按钮时，通用按钮处理程序会将单击事件转发给您在setButton（）中传递的任何处理程序，然后调用该处理程序会关闭对话框。如果希望在按下其中一个按钮时阻止对话框关闭，则必须替换按钮实际视图的通用按钮处理程序。因为它是在OnCreate（）中分配的，所以必须在调用默认的OnCreate（（）实现后替换它。在show（）方法的过程中调用OnCreate。您可以创建一个自定义对话框类，并重写OnCreate（）以调用super.OnCreate（），然后重写按钮处理程序，但是如果您创建了自定义对话框，则无法免费获得Builder，在这种情况下，有什么意义？因此，按照对话框的设计方式使用对话框，但同时控制何时关闭对话框，一种方法是首先调用dialog.Show（），然后使用dialog.getButton（）获取对按钮的引用，以覆盖单击处理程序。另一种方法是使用setOnShowListener（）并实现查找按钮视图并替换OnShowListen中的处理程序。两者之间的功能差异“几乎”为零，这取决于最初创建对话框实例的线程。通过查看源代码，onShowListener被发送到创建该对话框的线程上运行的处理程序的消息调用。所以，由于OnShowListener是由发布在消息队列上的消息调用的，所以从技术上讲，调用侦听器可能会在显示完成后延迟一段时间。因此，我认为最安全的方法是首先调用show.Dialog（），然后立即在同一执行路径中替换按钮处理程序。由于调用show（）的代码将在主GUI线程上运行，这意味着在该线程上执行任何其他代码之前，都将先执行您跟随show（）执行的代码，而OnShowListener方法的计时取决于消息队列。
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