桌面的滑动，点击继续菜单的切换

做了一个桌面的模型：剩下的就是填充，来实现桌面的具体操作的实现，但是存在一些问题：对于fragment的嵌套不知道是fragmen还是activity，另外，不知道切换是否可以换fragment,通过目录应该是可以。

Mune.activity:

public class Menu extends AppCompatActivity {
    private ViewPager mViewPager;
    private ImageView ivHome,ivMine;
    private TextView tvHome,tvMine;
    private LinearLayout llHome,llMine;
    private Adapter adapter;
    private List<Fragment> fragments;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);
        initView();//绑定事件
        initData();//初始数据
        adapter = new Adapter(getSupportFragmentManager(),fragments);//添加适配器
        mViewPager.setAdapter(adapter);
        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                Toast.makeText(Menu.this, "页面" + position, Toast.LENGTH_SHORT).show();
                OnViewPagerSelected(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
        //默认选择首页
        OnViewPagerSelected(0);
        llHome.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //view pager为第一页
                mViewPager.setCurrentItem(0);
            }
        });
        llMine.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mViewPager.setCurrentItem(1);
            }
        });
    }

    private void OnViewPagerSelected(int position) {
        reset();
        switch (position)
        {
            case 0:
            {
                ivHome.setSelected(true);
                break;
            }
            case 1:
            {   ivMine.setSelected(true);
                break;
            }
            default:
                break;
        }
    }

    private void reset() {
        ivHome.setSelected(false);
        ivMine.setSelected(false);
    }

    private void initData() {
        fragments = new ArrayList<>();
        Fragment1 fragmentHome = Fragment1.newInstance("首页","");
        Fragment1 fragmentMine = Fragment1.newInstance("我的","");
        fragments.add(fragmentHome);
        fragments.add(fragmentMine);
    }

    private void initView() {
        mViewPager = findViewById(R.id.vp);
        ivHome = findViewById(R.id.iv_home);
        ivMine = findViewById(R.id.iv_mine);
        tvHome = findViewById(R.id.tv_home);
        tvMine = findViewById(R.id.tv_mine);
        llHome = findViewById(R.id.Home);
        llMine = findViewById(R.id.Mine);
    }
}
activity布局：

<?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"
    tools:context=".Menu"
    android:orientation="vertical"
    >
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        />
    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        />
    <View
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/black"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="5dp">
        <LinearLayout
            android:id="@+id/Home"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="5dp"
            android:layout_weight="1"
            android:orientation="vertical"
            android:gravity="center_horizontal"
            >
            <ImageView
                android:id="@+id/iv_home"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:src="@drawable/home_selector" />
            <TextView
                android:id="@+id/tv_home"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="主页"
                android:textSize="20dp" />
        </LinearLayout>
        <LinearLayout
            android:id="@+id/Mine"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="5dp"
            android:layout_weight="1"
            android:orientation="vertical"
            android:gravity="center_horizontal">
            <ImageView
                android:id="@+id/iv_mine"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:src="@drawable/mine_seletor" />
            <TextView
                android:id="@+id/tv_mine"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="我的"
                android:textSize="20dp" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>
Adapeter

public class Adapter extends FragmentPagerAdapter {
    private List<Fragment> list;
    public Adapter(@NonNull FragmentManager fm,List<Fragment> fragment) {
        super(fm);
        this.list = fragment;
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return list == null ? null : list.get(position);
    }

    @Override
    public int getCount() {
        return list == null ? 0 : list.size();
    }
}
fragment

public class Fragment1 extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public Fragment1() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment Fragment1.
     */
    // TODO: Rename and change types and number of parameters
    public static Fragment1 newInstance(String param1, String param2) {
        Fragment1 fragment = new Fragment1();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }
    private TextView mTextView;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_1, container, false);
    }
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mTextView = view.findViewById(R.id.tv_content);
        mTextView.setText(mParam1);
    }


}
布局：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragment.Fragment1">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:id="@+id/tv_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/hello_blank_fragment"
        android:gravity="center"
        android:textSize="20dp"/>

</FrameLayout>