Java 对话框将不显示
我创建了一个AlertDialogFragment类,我试图用下面的代码从另一个类中显示它,但我不断收到一个错误,将类型从FragmentTransaction更改为FragmentManager。如果我将其更改为FragmentManager,我会收到一条更改为FragmentTransaction的消息,每当我更改为FragmentTransaction时,我都会收到一条更改为FragmentManager的消息: 以下是显示alertDialog的代码:Java 对话框将不显示,java,android,Java,Android,我创建了一个AlertDialogFragment类,我试图用下面的代码从另一个类中显示它,但我不断收到一个错误,将类型从FragmentTransaction更改为FragmentManager。如果我将其更改为FragmentManager,我会收到一条更改为FragmentTransaction的消息,每当我更改为FragmentTransaction时,我都会收到一条更改为FragmentManager的消息: 以下是显示alertDialog的代码: FragmentTransacti
FragmentTransaction ft= getFragmentManager().beginTransaction();
AlertDialogFragment newFragment= new AlertDialogFragment();
newFragment.show(ft, "alertDialog");
下面是该类的代码:
public class AlertDialogFragment extends android.support.v4.app.DialogFragment {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder
= new AlertDialog.Builder(getActivity());
builder.setMessage("Staying in Touch With The Ones You Love");
builder.setTitle("Togetherness");
builder.setCancelable(false);
builder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
return builder.create();
}
}
试用
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
要显示片段,您需要替换现有片段或向现有视图添加新片段 编辑:抱歉,没有注意到这是一个对话框片段。 使用以下命令:
// DialogFragment.show() will take care of adding the fragment
// in a transaction. We also want to remove any currently showing
// dialog, so make our own transaction and take care of that here.
FragmentTransaction ft = getFragmentManager().beginTransaction();
Fragment prev = getFragmentManager().findFragmentByTag("alertDialog");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
// Create and show the dialog.
newFragment.show(ft, "alertDialog");
请看下面的示例:
请记住,片段是在API级别11中引入的。如果您使用的是较旧的API级别,请按照此处的说明使用所有片段的支持库(我看到您的对话框fragment
已经从支持库FragmentDialog
继承)
查看本教程-->这正是我想要的。