Question

我创建了一个AlertDialogFragment类，我试图使用以下代码从另一个类中显示它，但我一直收到错误，将类型从FragmentTranscation更改为FragmentManager。如果我将其更改为FragmentManager，我会收到更改为FragmentTranscation的消息，每当我更改为FragmentTranscation时，我都会收到一条消息，要求更改为FragmentManager：

以下是显示alertDialog的代码：

FragmentTransaction ft= getFragmentManager().beginTransaction();
AlertDialogFragment newFragment= new AlertDialogFragment();
newFragment.show(ft, "alertDialog");

以下是该类的代码：

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();
}
}

Answer 1

尝试使用

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

Answer 2

要显示片段，您需要替换现有片段或将新片段添加到现有视图。

编辑：抱歉，没有注意到它是一个对话框片段。使用此：

// 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");

看看这里的示例：http://developer.android.com/reference/android/app/DialogFragment.html

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支持库来处理所有片段内容（我看到您的DialogFragment已经继承自支持库FragmentDialog）

http://developer.android.com/training/basics/fragments/support-lib.html

对话框不会显示

2 个答案: