src/com/android/car/settings/common/CarSettingActivity.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */
package com.android.car.settings.common;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

import com.android.car.settings.R;
import com.android.car.settings.home.HomepageFragment;

/**
 * Base activity class for car settings, provides a action bar with a back button that goes to
 * previous activity.
 */
public class CarSettingActivity extends AppCompatActivity implements
        BaseFragment.FragmentController {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.app_compat_activity);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        HomepageFragment homepageFragment = HomepageFragment.getInstance();
        homepageFragment.setFragmentController(this);
        launchFragment(homepageFragment);
    }

    @Override
    public void launchFragment(BaseFragment fragment) {
        fragment.setFragmentController(this);
        getFragmentManager()
                .beginTransaction()
                .setCustomAnimations(
                        R.animator.trans_right_in ,
                        R.animator.trans_left_out,
                        R.animator.trans_left_in,
                        R.animator.trans_right_out)
                .replace(R.id.fragment_container, fragment)
                .addToBackStack(null)
                .commit();
    }

    @Override
    public void goBack() {
        if (getFragmentManager().getBackStackEntryCount() > 0) {
            getFragmentManager().popBackStack();
        }
    }

    @Override
    public void onBackPressed() {
        if (getFragmentManager().getBackStackEntryCount() > 0) {
            getFragmentManager().popBackStack();
        } else {
            super.onBackPressed();
        }
    }
}