阶段二冲刺四

昨天学习了如何制作一个简单的底部导航

跟这视频学习，并没有遇到一些问题，

今天主要是学习了运用viewpager+fragment+bottom技术制作一个完整的底部导航

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".ui.activity.OrderActivity"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/order_linea1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical"
        android:layout_weight="1"
        >
        <androidx.viewpager.widget.ViewPager
            android:id="@+id/vp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
    </LinearLayout>
    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:background="#FFFAFA"
        app:itemIconTint="@color/btnnav_presscolor"
        app:itemTextColor="@color/btnnav_presscolor"
        android:id="@+id/btn_menu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:menu="@menu/btnnav_menu"
        />

</LinearLayout>

 

今天制作完成之后，我对viewpage和fragment的理解进一步加深

public class OrderActivity extends AppCompatActivity {
    private ViewPager mviewPager;
    private BottomNavigationView mbottomNavigationView;
    private MyfragmentAdapter myfragmentAdapter;
    private List<Fragment> fragmentList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_order);
        mviewPager = findViewById(R.id.vp);
        mbottomNavigationView = findViewById(R.id.btn_menu);

        initfragment();

        myfragmentAdapter = new MyfragmentAdapter(getSupportFragmentManager(), fragmentList);
        mviewPager.setAdapter(myfragmentAdapter);

        mviewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                onPagerSelected(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        mbottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.menu_game:
                        mviewPager.setCurrentItem(0);
                        break;
                    case R.id.menu_talk:
                        mviewPager.setCurrentItem(1);
                        break;
                    case R.id.menu_mine:
                        mviewPager.setCurrentItem(2);
                        break;
                    default:
                        mviewPager.setCurrentItem(0);
                        break;
                }
                return true;
            }
        });

    }

    private void onPagerSelected(int position) {

        switch (position) {
            case 0:
                mbottomNavigationView.setSelectedItemId(R.id.menu_game);
                break;
            case 1:
                mbottomNavigationView.setSelectedItemId(R.id.menu_talk);
                break;
            case 2:
                mbottomNavigationView.setSelectedItemId(R.id.menu_mine);
                break;
            default:
                mbottomNavigationView.setSelectedItemId(R.id.menu_game);
                break;
        }
    }

    private void initfragment() {
        fragmentList = new ArrayList<>();

        GameFragment gameFragment = new GameFragment();
        fragmentList.add(gameFragment);

        TalkFragment talkFragment = new TalkFragment();
        fragmentList.add(talkFragment);

        MIneFragment mIneFragment = new MIneFragment();
        fragmentList.add(mIneFragment);

    }
}

并且实现了点击翻页和滑动翻页