java 从对话框片段调用父片段方法

Call parent fragment method from dialog fragment

提问by Naruto

I have a parent fragment, within this. Upon a button click, a child dialog fragment is getting created. Now I would like to know how to call parent fragment function from child dialog fragment.

我有一个父片段，在这个片段中。单击按钮后，将创建一个子对话框片段。现在我想知道如何从子对话框片段调用父片段函数。

Here is the sample code :

这是示例代码：

/**SampleFragment.java**/

public class SampleFragment extends Fragment {
    // Instantiate view & add event handlers    

    public void onButtonClick(....) {
        // Create a dialog framgent
    }

    public void refreshView() {

    }
}

/**SampleDialogFragment.java**/

public class SampleDialogFragment extends DialogFragment {
    // Instantiate view for dialog

    public void onButtonClick(...) {
        // Call parent fragment method, i.e call refreshView() of SampleFragment 
    }
}

回答by SteD

In say your parent fragment, SettingsFragment for example. Note the setTargetFragment()

比如说你的父片段，例如 SettingsFragment。请注意setTargetFragment()

public void onButtonClick(....)
{
            PrefLanguageDialogFragment prefLang = PrefLanguageDialogFragment.newInstance();
            prefLang.setTargetFragment(SettingsFragment.this, 1337);
            prefLang.show(getFragmentManager(), "dialog");
}

In our dialog, note the getTargetFragment()

在我们的对话中，注意 getTargetFragment()

SettingsFragment frag = (SettingsFragment)getTargetFragment();
if(frag != null){
   frag.refreshSomething();
}

回答by Anant Shah

In a Fragment:

在一个片段中：

SampleDialogFragment dialogFragment = new SampleDialogFragment();
dialogFragment.show(getChildFragmentManager());

In a DialogFragment:

在 DialogFragment 中：

((SampleFragment) getParentFragment()).refreshView();

After calling this method, you can access public methods of a parent fragment.

调用该方法后，即可访问父片段的公共方法。

回答by mmlooloo

when you want add SampleFragmentto your activity set it a tag, e.g "SampleFragment".

当您想添加SampleFragment到您的活动时，请为其设置一个标签，例如“SampleFragment”。

then

然后

public void onButtonClick(...){

    FragmentManager fm = getFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();
    SampleFragment parent = (SampleFragment)fm.findFragmentByTag("SampleFragment");
    parent.refreshview();
}

have not test it but it may help:-)

还没有测试，但它可能有帮助:-)

回答by Ashish Tamrakar

The best way is to go for interface, declare an interface in nested fragment -

最好的方法是去接口，在嵌套片段中声明一个接口 -

public interface checkingClickListener { public void checkingClickListener(String data); }

公共接口checkingClickListener { public void checksClickListener(String data); }

then attach this interface to parent fragment -

然后将此接口附加到父片段 -

public void onAttachFragment(Fragment fragment)
    {
        try
        {
            clickListener = (checkingClickListener) fragment;

        } catch (ClassCastException e)
        {
              throw new ClassCastException(fragment.toString() + " must implement checkingClickListener");
        }
     }


     @Override
     public void onCreate(Bundle savedInstanceState)
     {
        Log.i(TAG, "onCreate");
        super.onCreate(savedInstanceState);

        this.mContext = getActivity().getApplicationContext();
        onAttachFragment(getParentFragment());
        ....
     }

you need to call this listener on some button click -

您需要在单击某个按钮时调用此侦听器 -

@Override
public void onClick(View v)
{
    switch (v.getId())
    {
        case R.id.tv_submit:
            if (clickListener != null)
            {                
                clickListener.checkingClickListener("sending data");
            }
            break;
    }
}

Implement this interface in parent fragment -

在父片段中实现此接口 -

public class Fragment_Parent extends Fragment implements Nested_Fragment.checkingClickListener
{
      ....
     @Override
     public void checkingClickListener(final List<Player> players_list)
     {
           FragmentManager fragmentManager = getChildFragmentManager();
           SomeOtherNestFrag someOtherNestFrag = (SomeOtherNestFrag)  fragmentManager.findFragmentByTag([Tag of your fragment which you should use when you add]);
           if(someOtherNestFrag != null)
           {
                // your some other frag need to provide some data back based on views.
                SomeData somedata = someOtherNestFrag.getSomeData();
                // it can be a string, or int, or some custom java object.
           }
     }
}

Hope this helps you.

希望这对你有帮助。