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
如果你使用的是材料设计,我建议你查看材料对话框。它为我修复了几个与当前打开的Android bug相关的问题(参见78088),但最重要的是,对于这个问题,它有一个autoDismiss标志,可以在使用生成器时设置。
其他回答
这段代码对你有用,因为我有一个类似的问题,这对我有用。:)
1-重写片段对话框类中的Onstart()方法。
@Override
public void onStart() {
super.onStart();
final AlertDialog D = (AlertDialog) getDialog();
if (D != null) {
Button positive = (Button) D.getButton(Dialog.BUTTON_POSITIVE);
positive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (edittext.equals("")) {
Toast.makeText(getActivity(), "EditText empty",Toast.LENGTH_SHORT).show();
} else {
D.dismiss(); //dissmiss dialog
}
}
});
}
}
这可能是一个很晚的回复,但使用setCancelable就可以了。
alertDial.setCancelable(false);
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。
科特林
val dialogView = LayoutInflater.from(requireContext()).inflate(R.layout.dialog_userinput, null)
val dialogBuilder = MaterialAlertDialogBuilder(requireContext(), R.style.AlertDialogTheme)
dialogBuilder.setView(dialogView)
dialogBuilder.setCancelable(false)
dialogBuilder.setPositiveButton("send",null)
dialogBuilder.setNegativeButton("cancel") { dialog,_ ->
dialog.dismiss()
}
val alertDialog = dialogBuilder.create()
alertDialog.show()
val positiveButton = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE)
positiveButton.setOnClickListener {
val myInputText = dialogView.etxt_userinput.text.toString().trim()
if(myInputText.isNotEmpty()){
//Do something
}else{
//Prompt error
dialogView.etxt_userinput.error = "Please fill this"
}
}
我们只需使用dialogBuilder创建一个AlertDialog,然后根据需要设置肯定按钮
防止对话框在单击时关闭,并且仅在internet可用时关闭
我也在尝试做同样的事情,因为我不希望对话框在互联网连接之前关闭。
这是我的代码:
AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this); builder.setTitle("Internet Not Connected");
if(ifConnected()){
Toast.makeText(this, "Connected or not", Toast.LENGTH_LONG).show();
}
else{
builder.setPositiveButton("Retry", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
if(!ifConnected())
{
builder.show();
}
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
builder.show();
}
这是我的连接管理器代码:
private boolean ifConnected()
{
ConnectivityManager connectivityManager= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();
return networkInfo!=null && networkInfo.isConnected();
}
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