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
使用此代码,您可以防止单击肯定按钮时对话框关闭。此外,您还可以使用否定按钮实现相同的功能。
final AlertDialog alertDialog = alertDialogBuilder
.setCancelable(false)
.setTitle("TITLE");
.setPositiveButton("OK", null)
.setNegativeButton("CANCEL",
(dialog, id) -> {
dialog.cancel();
})
.show();
Button positiveButton = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
positiveButton.setOnClickListener(v -> {
// check whatever you want
if(checkMyCondition())
dialog.cancel();
})
其他回答
这个链接的答案是一个简单的解决方案,它与API 3兼容。它与Tom Bollwitt的解决方案非常相似,但没有使用兼容性较差的OnShowListener。
是的,你可以。您基本上需要:使用DialogBuilder创建对话框show()对话框在显示的对话框中查找按钮并覆盖其onClickListener
自从我扩展EditTextPreference以来,我对Kamen的代码进行了一些小的修改。
@Override
protected void showDialog(Bundle state) {
super.showDialog(state);
class mocl implements OnClickListener{
private final AlertDialog dialog;
public mocl(AlertDialog dialog) {
this.dialog = dialog;
}
@Override
public void onClick(View v) {
//checks if EditText is empty, and if so tells the user via Toast
//otherwise it closes dialog and calls the EditTextPreference's onClick
//method to let it know that the button has been pressed
if (!IntPreference.this.getEditText().getText().toString().equals("")){
dialog.dismiss();
IntPreference.this.onClick(dialog,DialogInterface.BUTTON_POSITIVE);
}
else {
Toast t = Toast.makeText(getContext(), "Enter a number!", Toast.LENGTH_SHORT);
t.show();
}
}
}
AlertDialog d = (AlertDialog) getDialog();
Button b = d.getButton(DialogInterface.BUTTON_POSITIVE);
b.setOnClickListener(new mocl((d)));
}
真有趣!
如果您正在使用DialogFragment,这是处理Dialog的推荐方法。
AlertDialog的setButton()方法(我认为AlertDialogBuilder的setPositiveButton(()和setNegativeButton()也是如此)所发生的事情是,您使用它设置的按钮(例如AlertDialog.button_POSITIVE)在按下时实际上会触发两个不同的OnClickListener对象。
第一个是DialogInterface.OnClickListener,它是setButton()、setPositiveButton(()和setNegativeButton()的参数。
另一个是View.OnClickListener,它将被设置为在按下任何按钮时自动关闭AlertDialog,并且由AlertDialog自身设置。
您可以做的是使用带有null的setButton()作为DialogInterface.OnClickListener来创建按钮,然后在View.OnClick Listener中调用自定义操作方法。例如,
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
AlertDialog alertDialog = new AlertDialog(getActivity());
// set more items...
alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", null);
return alertDialog;
}
然后,您可以在DialogFragment的onResume()方法中重写默认AlertDialog的按钮View.OnClickListener(否则将关闭对话框):
@Override
public void onResume()
{
super.onResume();
AlertDialog alertDialog = (AlertDialog) getDialog();
Button okButton = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
okButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
performOkButtonAction();
}
});
}
private void performOkButtonAction() {
// Do your stuff here
}
您需要在onResume()方法中设置此值,因为getButton()将返回null,直到显示对话框!
这将导致您的自定义操作方法只被调用一次,默认情况下对话框不会被关闭。
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。
这可能是一个很晚的回复,但使用setCancelable就可以了。
alertDial.setCancelable(false);
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