我使用了一个简单的文本字段警告对话框,其中有一个肯定按钮和一个取消按钮。我希望验证我的警告对话框,并在输入无效时阻止done按钮关闭AlertDialog。
除了创建自定义对话框之外,还有什么方法可以防止PositiveButton onClick()处理程序在验证失败时关闭对话框?
class CreateNewCategoryAlertDialog {
final EditText editText;
final AlertDialog alertDialog;
class PositiveButtonClickListener implements OnClickListener {
@Override
public void onClick(DialogInterface dialog, int which) {
String name = editText.getText().toString();
if(name.equals("")) {
editText.requestFocus();
editText.setError("Please enter a name");
// Some code to stop AlertDialog from closing goes here...
} else {
doSomethingUsefulWithName();
}
}
}
AlertDialog buildAlertDialog(Context context) {
return new AlertDialog.Builder(context)
.setTitle(context.getString(R.string.enter_name))
.setMessage(context.getString(R.string.enter_name_msg))
.setView(editText)
.setPositiveButton(context.getString(R.string.done), new PositiveButtonClickListener())
.setNegativeButton(context.getString(R.string.cancel), null).create();
}
}
发布于 2011-09-09 01:49:40
这就是我是如何做到的。从技术上讲,它不会保持对话框处于打开状态,它会暂时关闭它,然后重新打开它,但最终的结果是相同的。
class MyAlertDialog implements OnDismissListener, OnCancelListener {
final private EditText editText;
final private AlertDialog alertDialog;
final private EventManager eventManager;
final private CategorySelector categorySelector;
private Boolean canceled;
MyAlertDialog(Context context) {
editText = new EditText(context);
alertDialog = buildAlertDialog(context);
alertDialog.setOnDismissListener(this);
alertDialog.setOnCancelListener(this);
show();
}
private AlertDialog buildAlertDialog(Context context) {
return new AlertDialog.Builder(context)
.setTitle(context.getString(R.string.enter_name))
.setMessage(context.getString(R.string.enter_name))
.setView(editText)
.setNeutralButton(context.getString(R.string.save_text), null)
.setNegativeButton(context.getString(R.string.cancel_text), null)
.create();
}
public void show() {
canceled = false;
alertDialog.show();
}
@Override public void onDismiss(DialogInterface dialog) {
if(!canceled) {
final String name = editText.getText().toString();
if(name.equals("")) {
editText.setError("Please enter a non-empty name");
show();
} else {
doWhateverYouWantHere(name);
}
}
}
@Override public void onCancel(DialogInterface dialog) {
canceled = true;
}
}
https://stackoverflow.com/questions/6511658
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