BottomNavigationViewを少しいじってみた②

### ■ 各itemクリック時のviewにfragmentとxmlを使って分ける
bottomnavigationviewのitemを押したときのviewを、それぞれのレイアウトを別のものにしたかったため、fragmentとxmlでわけました。

```java:main.java
package com.example.yoshihiro.smartkoneco;

import ...

public class Main extends AppCompatActivity {

    private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.fragment1:
                    loadFragment1();
                    return true;
                case R.id.fragment2:
                    loadFragment2();
                    return true;
                case R.id.fragment3:
                    loadFragment3();
                    return true;
                case R.id.fragment4:
                    loadFragment4();
                    return true;
            }
            return false;
        }

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        if (savedInstanceState == null) {
            Fragment1();
        }
        BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
        disableShiftMode(navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
    }

    public static void disableShiftMode(BottomNavigationView view) {
        ...
    }

    private void loadFragment1() {
        Fragment1 fragment = Fragment1.newInstance();
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.fragment_frame, fragment);
        ft.commit();
    }
    // 以下load~ 3つで同じ
}

class Fragment1 extends Fragment {
    public static Fragment1 newInstance() {
        return new Fragment1();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment1, container, false);
    }
}
// 以下3つfragment2~4で同じ
```


```xml:main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.yoshihiro.smartkoneco.Main">

    <include layout="@layout/main_title"
        tools:layout_editor_absoluteY="-44dp"
        tools:layout_editor_absoluteX="-260dp" />

    <FrameLayout
        android:id="@+id/fragment_frame"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">
    </FrameLayout>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="?android:attr/windowBackground"
        app:itemIconTint="@color/buttom_navigation"
        app:itemTextColor="@color/buttom_navigation"
        app:menu="@menu/navigation" />

</LinearLayout>
```

```xml:time_table.xml,record.xml,room_search.xml,news.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <!--
        各レイアウト
    -->
</LinearLayout>
```

参考：

[Android using BottomNavigationView
](https://www.learn2crack.com/2017/06/android-using-bottomnavigationview.htm)

[Start fragment in BottomNavigationView](https://stackoverflow.com/questions/44338835/start-fragment-in-bottomnavigationview:embed)

[Bottom Navigation Views
](https://guides.codepath.com/android/Bottom-Navigation-Views:title)