Calling DialogFragment from Fragment (not Fragment

问题:

Here's my problem : I do have a FragmentActivity wich contains a Fragment list (with methods to navigate between them) In one of thoose Fragments i need to call a DialogFragment to display a "zoom" on a Picture contained in that fragment.

But it seems that you can't call a DialogFragment directly from a Fragment.

Is there any way to get somekind of "callback" to the FragmentActivity to make this display the DialogFragment over the fragment.

Or simply a "glitch" to call it directly from the Fragment.

If it's the case do you guyz knows a good tutorial about it ?

Best regards,

Elie Page

回答1:

When you create a new Dialog, you can simply call it using this (very) simple method from a Fragment.

DialogFragment dialog = DialogFragment.instantiate(getActivity(), "Hello world");
dialog.show(getFragmentManager(), "dialog");

If you want to use your own dialog, please use that kind of code.

public class MyDialogFragment extends DialogFragment
{
    //private View pic;

    public MyDialogFragment()
    {
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_my_dialog, new LinearLayout(getActivity()), false);

        // Retrieve layout elements
        TextView title = (TextView) view.findViewById(R.id.text_title);

        // Set values
        title.setText("Not perfect yet");

        // Build dialog
        Dialog builder = new Dialog(getActivity());
        builder.requestWindowFeature(Window.FEATURE_NO_TITLE);
        builder.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
        builder.setContentView(view);
        return builder;
    }
}

回答2:

Check for import statements. If we use

ExampleDialogFragment dialog = new ExampleDialogFragment ();
dialog .show(getFragmentManager(), "example");

Then make sure to import

import android.app.DialogFragment;
import android.app.Fragment;

not from the support library.

import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;

回答3:

it will help if you need to show a fragment dialog inside a fragment

Dialogfragment

public class DialogBoxFragment extends DialogFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    View rootView = inflater.inflate(R.layout.dialog_fragment, container, false);
    getDialog().setTitle("simple dialog");
    return rootView;
}
}

now showing the fragment dialog into a fragment

DialogFragment dialogFragment = new DialogFragment ();
                            dialogFragment.show(getActivity().getFragmentManager(),"simple dialog");

回答4:

For me, it was the following: https://stackoverflow.com/a/25056160/2413303

The most important parts are that you need to have a Callback for your dialog fragment:

public class MyFragment extends Fragment implements MyDialog.Callback

Which kinda works like this

public class MyDialog extends DialogFragment implements View.OnClickListener {

public static interface Callback
{
    public void accept();
    public void decline();
    public void cancel();
}

You make the Activity show the dialog for you from the Fragment:

    MyDialog dialog = new MyDialog();
    dialog.setTargetFragment(this, 1); //request code
    activity_showDialog.showDialog(dialog);

Where showDialog() for me was the following method:

@Override
public void showDialog(DialogFragment dialogFragment)
{
    FragmentManager fragmentManager = getSupportFragmentManager();
    dialogFragment.show(fragmentManager, "dialog");
}

And you call back onto your target fragment:

@Override
public void onClick(View v)
{
    Callback callback = null;
    try
    {
        callback = (Callback) getTargetFragment();
    }
    catch (ClassCastException e)
    {
        Log.e(this.getClass().getSimpleName(), "Callback of this class must be implemented by target fragment!", e);
        throw e;
    }

    if (callback != null)
    {
        if (v == acceptButton)
        {   
            callback.accept();
            this.dismiss();
        }
        else if (...) {...}
    }
    else
    {
        Log.e(this.getClass().getSimpleName(), "Callback was null.");
    }
}

回答5:

Try this simple class I did in a myown project:

        public class UIDialogMessage extends DialogFragment {

    public static UIDialogMessage newInstance(int aTitleID, int aMessageID) {
        return newInstance(aTitleID, aMessageID, true);
    }

    public static UIDialogMessage newInstance(int aTitleID, int aMessageID, boolean aDoIt) {
        UIDialogMessage frag = new UIDialogMessage();
        Bundle args = new Bundle();
        args.putInt("titleID", aTitleID);
        args.putInt("messageID", aMessageID);
        args.putBoolean("keyBoolDoSomething", aDoIt);
        frag.setArguments(args);
        return frag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        int mTitleID = getArguments().getInt("titleID");
        int mMessageID = getArguments().getInt("messageID");
        final boolean mDoIt= getArguments().getBoolean("keyBoolDoSomething", true);

        return new AlertDialog.Builder(getActivity())
                .setTitle(mTitleID)
                .setMessage(mMessageID)
                .setPositiveButton(getResources().getString(R.string.dialog_button_gotcha),
                        new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog, int whichButton) {
                                dialog.dismiss();
                                if (mDoIt)
                                    doIt();
                            }
                        })
                .create();
    }

    private void doIt() {
        ...
    }
}

and you can call from a Fragment as shown below:

showDialog(R.string.dialog_title, R.string.dialog_message, false);

private void showDialog(int aTitleID, int aMessageID, boolean aDoIt) {
        DialogFragment uiDialogMessage = UIDialogMessage.newInstance(aTitleID, aMessageID, aDoIt);
        uiDialogMessage.show(getFragmentManager(), "dialog");
    }

回答6:

I had same issue solved by import

import android.support.v4.app.ListFragment;

instead of

import android.app.ListFragment;