Android BottomNavigationView底部导航效果

dependencies {
  //...
  compile 'com.android.support:design:25.1.0'
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item
    android:id="@+id/call"
    android:icon="@android:drawable/ic_menu_call"
    android:title="call" />
  <item
    android:id="@+id/message"
    android:icon="@android:drawable/ic_dialog_email"
    android:title="message" />
  <item
    android:id="@+id/search"
    android:icon="@android:drawable/ic_menu_search"
    android:title="搜索" />

  <item
    android:id="@+id/delete"
    android:icon="@android:drawable/ic_menu_delete"
    android:title="删除"/>
</menu>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_bottom_navigation_view"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  >
  <TextView
    android:id="@+id/tv_content"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:text="演示内容"
    android:textSize="36sp"/>

  <android.support.design.widget.BottomNavigationView
    android:id="@+id/navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    app:itemBackground="@android:color/black"
    app:itemIconTint="@android:color/white"
    app:itemTextColor="@android:color/white"
    app:menu="@menu/navigation"/>
</RelativeLayout>

public class BottomNavigationViewActivity extends AppCompatActivity {
  private TextView textView;
  private BottomNavigationView navigationView;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bottom_navigation_view);

    textView = (TextView) findViewById(R.id.text);
    navigationView = (BottomNavigationView) findViewById(R.id.navigation);

    //选中条目的监听事件
    navigationView.setOnNavigationItemSelectedListener(
        new BottomNavigationView.OnNavigationItemSelectedListener() {
          @Override
          public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            textView.setText(item.getTitle().toString());
            return true;
          }
        });
  }
}