对话框不会显示

Question

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FragmentTranscation更改为FragmentManager。如果我将其更改为FragmentManager，我得到一个消息更改为FragmentTranscation，每当我改变FragmentTranscation，我得到一个消息更改为FragmentManager：

这里是展示alertDialog代码：

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

下面是类代码：

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

要显示片段，您需要替换现有的片段或将新的片段添加到现有的视图。

编辑：对不起，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"); 

这里看看例子：http://developer.android.com/reference/android/app/DialogFragment.html

记住如果你使用的是老式API级别片段API等级11介绍，按照说明这里使用支持库的所有片段的东西（我看你DialogFragment已经从支持库FragmentDialog继承）

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

Answer 2

尝试使用

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();