Le Tutoriel de Android DialogFragment

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Show Dialog Fragment"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:gravity="center"
        android:text="---"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button_show" />
</androidx.constraintlayout.widget.ConstraintLayout>

package org.o7planning.dialogfragmentexample;

import android.app.Activity;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.DialogFragment;

public class YesNoDialogFragment extends DialogFragment {

    public static final String ARG_TITLE = "YesNoDialog.Title";
    public static final String ARG_MESSAGE = "YesNoDialog.Message";

    private YesNoDialogFragmentListener listener;

    public interface YesNoDialogFragmentListener {
        /**
         *
         * @param resultCode - Activity.RESULT_OK, Activity.RESULT_CANCEL
         * @param data
         */
         public void onYesNoResultDialog(int resultCode, @Nullable Intent data);
    }

    public YesNoDialogFragment() {

    }

    public void setOnYesNoDialogFragmentListener(YesNoDialogFragmentListener listener) {
        this.listener = listener;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Bundle args = getArguments();
        String title = args.getString(ARG_TITLE);
        String message = args.getString(ARG_MESSAGE);

        return new AlertDialog.Builder(getActivity())
                .setTitle(title)
                .setMessage(message)
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        buttonOkClick();
                    }
                })
                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        buttonNoClick();
                    }
                })
                .create();
    }

    private void buttonOkClick() {
        int resultCode = Activity.RESULT_OK;

        Bundle bundle = new Bundle();
        bundle.putString("key1", "Value 1");
        bundle.putString("key2", "Value 2");
        Intent data  = new Intent().putExtras(bundle);

        // Open this DialogFragment from an Activity.
        if(this.listener != null)  {
            this.listener.onYesNoResultDialog(Activity.RESULT_OK, data);
        }
        // Open this DialogFragment from another Fragment.
        else {
            // Send result to your TargetFragment.
            // See (Your) TargetFragment.onActivityResult()
            getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, data);
        }
    }

    private void buttonNoClick() {
        int resultCode = Activity.RESULT_CANCELED;
        Intent data  = null;

         // Open this DialogFragment from an Activity.
        if(this.listener != null)  {
            this.listener.onYesNoResultDialog(resultCode, data);
        }
        // Open this DialogFragment from another Fragment.
        else {
            // Send result to your TargetFragment.
            // See (Your) TargetFragment.onActivityResult()
            getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, data);
        }
    }

}

package org.o7planning.dialogfragmentexample;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity
        implements YesNoDialogFragment.YesNoDialogFragmentListener {

    private Button buttonShow;
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.buttonShow = (Button) this.findViewById(R.id.button_show);
        this.textView = (TextView) this.findViewById(R.id.textView);

        this.buttonShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                buttonShowClicked();
            }
        });
    }

    // User click on "Show Dialog" button.
    private void buttonShowClicked()  {
        this.textView.setText("---");

        // Create YesNoDialogFragment
        DialogFragment dialogFragment = new YesNoDialogFragment();

        // Arguments:
        Bundle args = new Bundle();
        args.putString(YesNoDialogFragment.ARG_TITLE, "Confirmation");
        args.putString(YesNoDialogFragment.ARG_MESSAGE, "Do you like this example?");
        dialogFragment.setArguments(args);

        FragmentManager fragmentManager = this.getSupportFragmentManager();

        // Show:
        dialogFragment.show(fragmentManager, "Dialog");
    }

    @Override
    public void onAttachFragment(Fragment fragment) {
        if (fragment instanceof YesNoDialogFragment) {
            YesNoDialogFragment yesNoDialogFragment = (YesNoDialogFragment) fragment;
            yesNoDialogFragment.setOnYesNoDialogFragmentListener(this);
        }
    }

    // Implement method of YesNoDialogFragment.YesNoDialogFragmentListener
    @Override
    public void onYesNoResultDialog(int resultCode, @Nullable Intent data) {
        if(resultCode == Activity.RESULT_OK) {
            String value1 = data.getStringExtra("key1"); // ...
            this.textView.setText("You select YES");
        } else if(resultCode == Activity.RESULT_CANCELED) {
            this.textView.setText("You select NO");
        } else {
            this.textView.setText("You don't select");
        }
    }

}

package org.o7planning.dialogfragmentexample;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

public class ExampleFragment extends Fragment {

    private static final int REQUEST_CODE_YESNO_DIALOG_FRAGMENT = 1000;
    
    public ExampleFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_example, container, false);
    }

    // Call this method to show YesNoDialogFragment
    private void showYesNoDialogFragment() {
        // Create YesNoDialogFragment
        DialogFragment dialogFragment = new YesNoDialogFragment();

        // Arguments:
        Bundle args = new Bundle();
        args.putString(YesNoDialogFragment.ARG_TITLE, "Confirmation");
        args.putString(YesNoDialogFragment.ARG_MESSAGE, "Do you like this example?");
        dialogFragment.setArguments(args);

        // YesNoDialogFragment will return results for targetFragment.
        // So, Need to Override onActivityResult() method, to get results.
        Fragment targetFragment = this;

        // IMPORTANT!!
        dialogFragment.setTargetFragment(targetFragment, REQUEST_CODE_YESNO_DIALOG_FRAGMENT);

        FragmentManager fragmentManager = this.getFragmentManager();
        // Show:
        dialogFragment.show(fragmentManager, "Dialog");
    }

    // Results are returned by YesNoDialogFragment.
    @Override
    public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode == REQUEST_CODE_YESNO_DIALOG_FRAGMENT) {
            if(resultCode == Activity.RESULT_OK) {
                Toast.makeText(this.getContext(), "You select YES", Toast.LENGTH_LONG).show();
            } else if(resultCode == Activity.RESULT_CANCELED) {
                Toast.makeText(this.getContext(), "You select NO", Toast.LENGTH_LONG).show();
            }
        }
    }
}