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
为DialogFragment使用自定义布局,并在内容下添加LinearLayout,该布局可以设置为无边框,以匹配Google Material Design。然后找到新创建的按钮并覆盖其OnClickListener。
例子:
public class AddTopicFragment extends DialogFragment {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = getActivity().getLayoutInflater();
final View dialogView = inflater.inflate(R.layout.dialog_add_topic, null);
Button saveTopicDialogButton = (Button) dialogView.findViewById(R.id.saveTopicDialogButton);
Button cancelSaveTopicDialogButton = (Button) dialogView.findViewById(R.id.cancelSaveTopicDialogButton);
final AppCompatEditText addTopicNameET = (AppCompatEditText) dialogView.findViewById(R.id.addTopicNameET);
final AppCompatEditText addTopicCreatedByET = (AppCompatEditText) dialogView.findViewById(R.id.addTopicCreatedByET);
saveTopicDialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// validate inputs
if(addTopicNameET.getText().toString().trim().isEmpty()){
addTopicNameET.setError("Topic name can't be empty");
addTopicNameET.requestFocus();
}else if(addTopicCreatedByET.getText().toString().trim().isEmpty()){
addTopicCreatedByET.setError("Topic created by can't be empty");
addTopicCreatedByET.requestFocus();
}else {
// save topic to database
Topic topic = new Topic();
topic.name = addTopicNameET.getText().toString().trim();
topic.createdBy = addTopicCreatedByET.getText().toString().trim();
topic.createdDate = new Date().getTime();
topic.save();
AddTopicFragment.this.dismiss();
}
}
});
cancelSaveTopicDialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AddTopicFragment.this.dismiss();
}
});
// Inflate and set the layout for the dialog
// Pass null as the parent view because its going in the dialog layout
builder.setView(dialogView)
.setMessage(getString(R.string.add_topic_message));
return builder.create();
}
}
dialog_add_topic.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:padding="@dimen/activity_horizontal_margin"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:errorEnabled="true">
<android.support.v7.widget.AppCompatEditText
android:id="@+id/addTopicNameET"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Topic Name"
android:inputType="textPersonName"
android:maxLines="1" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:errorEnabled="true">
<android.support.v7.widget.AppCompatEditText
android:id="@+id/addTopicCreatedByET"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Created By"
android:inputType="textPersonName"
android:maxLines="1" />
</android.support.design.widget.TextInputLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:text="@string/cancel"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/cancelSaveTopicDialogButton"
style="@style/Widget.AppCompat.Button.ButtonBar.AlertDialog" />
<Button
android:text="@string/save"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/saveTopicDialogButton"
style="@style/Widget.AppCompat.Button.ButtonBar.AlertDialog" />
</LinearLayout>
</LinearLayout>
这是最终结果。
其他回答
超简单的Kotlin方法
with(AlertDialog.Builder(this)) {
setTitle("Title")
setView(R.layout.dialog_name)
setPositiveButton("Ok", null)
setNegativeButton("Cancel") { _, _ -> }
create().apply {
setOnShowListener {
getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener {
//Validate and dismiss
dismiss()
}
}
}
}.show()
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!
对于API 8之前的版本,如果editText的内容不正确,我使用一个布尔标志、一个关闭监听器并再次调用dialog.show来解决这个问题。这样地:
case ADD_CLIENT:
LayoutInflater factoryClient = LayoutInflater.from(this);
final View EntryViewClient = factoryClient.inflate(
R.layout.alert_dialog_add_client, null);
EditText ClientText = (EditText) EntryViewClient
.findViewById(R.id.client_edit);
AlertDialog.Builder builderClient = new AlertDialog.Builder(this);
builderClient
.setTitle(R.string.alert_dialog_client)
.setCancelable(false)
.setView(EntryViewClient)
.setPositiveButton("Save",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
EditText newClient = (EditText) EntryViewClient
.findViewById(R.id.client_edit);
String newClientString = newClient
.getText().toString();
if (checkForEmptyFields(newClientString)) {
//If field is empty show toast and set error flag to true;
Toast.makeText(getApplicationContext(),
"Fields cant be empty",
Toast.LENGTH_SHORT).show();
add_client_error = true;
} else {
//Here save the info and set the error flag to false
add_client_error = false;
}
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
add_client_error = false;
dialog.cancel();
}
});
final AlertDialog alertClient = builderClient.create();
alertClient.show();
alertClient
.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
//If the error flag was set to true then show the dialog again
if (add_client_error == true) {
alertClient.show();
} else {
return;
}
}
});
return true;
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。
受汤姆的回答启发,我认为这里的想法是:
在创建对话框期间将onClickListener设置为null然后在显示对话框后设置onClickListener。
您可以像Tom一样重写onShowListener。或者,您可以
调用AlertDialog的show()后获取按钮按如下方式设置按钮的onClickListener(我认为稍微可读一些)。
代码:
AlertDialog.Builder builder = new AlertDialog.Builder(context);
// ...
final AlertDialog dialog = builder.create();
dialog.show();
// now you can override the default onClickListener
Button b = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.i(TAG, "ok button is clicked");
handleClick(dialog);
}
});
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