我应该使用哪个片段管理器

Question

Im using fragments and tryng to make a form which i can get the date using datepicker for after store it in a database (There is not the problem now) The problem its i was following a guide to learn how to use the datepicker in fragments activity. And i got a pair of questions (And errors) I've been using This guide

And im getting this error:

"The method getSupportFragmentManager is undefined for the type"

i've read there is not getSupportFragmentManager in "Fragments" but they are in "FragmentActivity"

There is a equivalent in "Fragments" For this method? or what i should do.

I was searching and reading a lot of guides but this is the easily way that i found and have this problem.

I will post my Fragment class,fragment xml,and datepickerfragment

FragmentClass (regventa_Fragment)..

public class Regventa_Fragment extends Fragment  {
public Button guardar;
public Button fecha_button;

public Regventa_Fragment(){}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_regventa, container, false);

    Toast.makeText(getActivity(), "Hola", Toast.LENGTH_SHORT).show();


    return rootView;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    guardar=(Button)getView().findViewById(R.id.guardar);
    //fecha_button=(Button)getView().findViewById(R.id.fecha_button);
    getView().findViewById(R.id.fecha_button).setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View v) {
            showDatePicker();
           }

        private void showDatePicker() {
            // TODO Auto-generated method stub

        }
          });
}

private void showDatePicker() {
      DatePickerFragment date = new DatePickerFragment();
      /**
       * Set Up Current Date Into dialog
       */
      Calendar calender = Calendar.getInstance();
      Bundle args = new Bundle();
      args.putInt("year", calender.get(Calendar.YEAR));
      args.putInt("month", calender.get(Calendar.MONTH));
      args.putInt("day", calender.get(Calendar.DAY_OF_MONTH));
      date.setArguments(args);
      /**
       * Set Call back to capture selected date
       */
      date.setCallBack(ondate);
      date.show(getFragmentManager(), "Date Picker");
     }

     OnDateSetListener ondate = new OnDateSetListener() {
      @Override
      public void onDateSet(DatePicker view, int year, int monthOfYear,
        int dayOfMonth) {
      }
     };

}

fragment_regventa.XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_marginTop="10dp"
    android:layout_marginBottom="15dp"
    android:gravity="center_horizontal" >

    <Button
        android:id="@+id/guardar"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/guardar" />

    <Button
        android:id="@+id/borrar"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/borrar" />
</LinearLayout>

<Button
    android:id="@+id/fecha_button"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/fecha_venta"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="15dp"
    android:text="@string/fecha_button" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:text="@string/regventa"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<EditText
    android:id="@+id/comprador"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="10dp"
    android:ems="10"
    android:hint="@string/comprador" >

    <requestFocus />
</EditText>

<TextView
    android:id="@+id/fecha_venta"
    style="android:editTextStyle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/fecha_button"
    android:layout_below="@+id/comprador"
    android:layout_marginTop="17dp"
    android:ems="10"
    android:hint="@string/fecha_venta"
    android:textAlignment="center"
    android:textSize="17sp" />

<EditText
    android:id="@+id/elevendidos"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/pesoventa"
    android:layout_below="@+id/pesoventa"
    android:layout_marginTop="24dp"
    android:ems="10"
    android:hint="@string/elementos_vendidos"
    android:inputType="number" />

<EditText
    android:id="@+id/pesoventa"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/comprador"
    android:layout_below="@+id/fecha_button"
    android:layout_marginTop="14dp"
    android:ems="10"
    android:hint="@string/pesoventa" />

DatePicker Fragmentent

public class DatePickerFragment extends DialogFragment {
OnDateSetListener ondateSet;

public DatePickerFragment() {
}

public void setCallBack(OnDateSetListener ondate) {
ondateSet = ondate;
}

private int year, month, day;

@Override
public void setArguments(Bundle args) {
super.setArguments(args);
year = args.getInt("year");
month = args.getInt("month");
day = args.getInt("day");
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new DatePickerDialog(getActivity(), ondateSet, year, month, day);
}
}

If i change from "Fragment" to "FragmentActivity" Thats going to works good? with the other fragments i have?.. Thanks

Answer 1

getSupportFragmentManager() is meant for android support library

that means

if you are using support library you have to use getSupportFragmentManager() else you have to use getFragmentManager()

to verify check your import

import android.support.v4.app.Fragment; means you using support library then you have to use getSupportFragmentManager()

import android.app.Fragment means you are using the native library then you have to use getFragmentManager()

Good Luck :)

Answer 2

I solve the problem.. I was using

import android.support.v4.app.Fragment 

Instead of...

import android.app.Fragment;

In DatepickerFragment.

After that i use...

date.show(getActivity().getFragmentManager(), "Date Picker");

Thanks

Answer 3

First you need to understand the deference between FragmentActivity & Fragment. FragmentActivity is subclass of Activity & activity holds Fragment & two are different things. See the below links & look that fragment doesn't not inherit from Activity.

• http://developer.android.com/reference/android/support/v4/app/FragmentActivity.html
• http://developer.android.com/reference/android/app/Fragment.html

So, if you need to use getSupportFragmentManager() then first call the activity that holds the fragment & call the fragmentManager. like : getActivity().getSupportFragmentManager()

Another thing is if you use Fragment from support library then you get " getSupportFragmentManager() " other wise you get " getFragmentManager() "

Thanks