FairEmail/app/src/main/java/eu/faircode/email/ActivityCompose.java

package eu.faircode.email;

/*
    This file is part of Safe email.

    Safe email is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    NetGuard is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with NetGuard.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018 by Marcel Bokhorst (M66B)
*/

import android.os.Bundle;
import android.view.MenuItem;

import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

public class ActivityCompose extends ActivityBase implements FragmentManager.OnBackStackChangedListener {
    static final int REQUEST_CONTACT_TO = 1;
    static final int REQUEST_CONTACT_CC = 2;
    static final int REQUEST_CONTACT_BCC = 3;
    static final int REQUEST_ATTACHMENT = 4;

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        getSupportFragmentManager().addOnBackStackChangedListener(this);

        if (getSupportFragmentManager().getFragments().size() == 0) {
            FragmentCompose fragment = new FragmentCompose();
            fragment.setArguments(getIntent().getExtras());

            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("compose");
            fragmentTransaction.commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                getSupportFragmentManager().popBackStack();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onBackStackChanged() {
        if (getSupportFragmentManager().getBackStackEntryCount() == 0)
            finish();
    }
}