Question

我真的不明白support.v4库正在发生什么，但无论如何。我有一个Fragment，我实现在单击导航抽屉中的项目时打开（android studio中的默认实现）。在这个片段中，我想打开一个datePickerDialog，但我无法找到解决方案。这是我的片段与datePicker：

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle; 
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.ListView;
import android.widget.Toast;

import java.util.Calendar;

public class SearchFragment extends Fragment {

private ListView listView;
private CustomAdapter activityAdapter;
private Button filterButton;

public SearchFragment(){}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_search, container, false);

    activityAdapter = new CustomAdapter(getActivity());

    listView = (ListView) rootView.findViewById(R.id.lvActivity);
    listView.setAdapter(activityAdapter);
    activityAdapter.loadObjects();
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
            String activity = activityAdapter.getItem(position).get("activity").toString();
            Toast.makeText(getActivity(), activity, Toast.LENGTH_SHORT).show();
        }
    });
    filterButton = (Button) rootView.findViewById(R.id.bFilter);

    return rootView;
}

public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");
}

public static class DatePickerFragment extends DialogFragment
        implements DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        // Do something with the date chosen by the user
    }
}

}

我的问题在于这一行：newFragment.show（getSupportFragmentManager（），＆＃34; datePicker＆＃34;）;

如果活动没有扩展Fragment但我的活动已经在扩展ActionBarActivity，我发现存在兼容性问题。我该怎么办？

Answer 1

不，你没有。你在这里导入错误

  import android.app.DialogFragment;

将其更改为使用支持库

Answer 2

更改import android.app.DialogFragment;

到

android.support.v4.app.DialogFragment

这将从支持包

导入DialogFragment类

使用DatePickerDialog时冲突支持.v4.app.Fragment与app.Fragment

2 个答案: