getFragmentManager（）返回null，与android.support.v4.app.DialogFragment支持libraray [英] getFragmentManager() returns null, with android.support.v4.app.DialogFragment support libraray

问题描述

下面是片段的对话框：

import android.support.v4.app.DialogFragment;  
public static class SensorMeasurmentsDialogFragment extends DialogFragment {

    public static SensorMeasurmentsDialogFragment newInstance(int title) {

        SensorMeasurmentsDialogFragment frag = new SensorMeasurmentsDialogFragment();
        Bundle args = new Bundle();
        args.putInt("title", title);
        frag.setArguments(args);
        return frag;

        @Override public Dialog onCreateDialog(Bundle savedInstanceState) {
            .....
        }
    }
}

它的呼叫从一个普通的活动不是从fragmentActivity因为做
我的活动已经扩展mapActivity。

the call to it is done from a regular activity not from a fragmentActivity because my activity already extends mapActivity.

m_measurmentDlg=SensorMeasurmentsDialogFragment.newInstance(R.string.app_name);
m_measurmentDlg.show(m_measurmentDlg.getFragmentManager(),"measurments");

任何想法为什么是空？

any idea why is it Null?

推荐答案

活动必须从FragmentActivity延长你能够使用片段。你可能有目前使用一种变通方法，直到谷歌更新其地图图书馆。

The activity must extend from FragmentActivity for you to be able to use Fragments. You might have to use a workaround at the moment until Google updates their map library.

您可能需要使用修改后的兼容性LIB像这样的：

You might have to use a modified compatibility lib such as this one:

https://github.com/petedoyle/android-support-v4-googlemaps

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