冲刺1

package com.example.newapplication

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.findNavController
import androidx.navigation.fragment.NavHostFragment
import androidx.viewpager.widget.ViewPager
import com.example.newapplication.adapter.ViewPagerAdapter
import com.example.newapplication.homeFragment.*
import com.google.android.material.bottomnavigation.BottomNavigationView

class HomeActivity : AppCompatActivity() {
    private lateinit var navigationView: BottomNavigationView
    private lateinit var viewPager: ViewPager

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home)

        navigationView = findViewById(R.id.nav_bottom)
        viewPager = findViewById(R.id.vp)

        val fragments = listOf(HomeFragment(),ActivityFragment(), AddFragment(),ListFragment(), MyFragment())
        val viewPagerAdapter = ViewPagerAdapter(supportFragmentManager, fragments)
        viewPager.adapter = viewPagerAdapter

        navigationView.setOnNavigationItemSelectedListener { item ->
            when (item.itemId) {
                R.id.item_home -> {
                    viewPager.currentItem = 0
                    true
                }
                R.id.item_activity -> {
                    viewPager.currentItem = 1
                    true
                }
                R.id.item_send -> {
                    viewPager.currentItem = 2
                    true
                }
                R.id.item_list -> {
                    viewPager.currentItem = 3
                    true
                }
                R.id.item_my -> {
                    viewPager.currentItem = 4
                    true
                }
                else -> false
            }
        }

        viewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
            override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}

            override fun onPageSelected(position: Int) {
                when (position) {
                    0 -> navigationView.selectedItemId = R.id.item_home
                    1 -> navigationView.selectedItemId = R.id.item_activity
                    2 -> navigationView.selectedItemId = R.id.item_send
                    3 -> navigationView.selectedItemId = R.id.item_list
                    4 -> navigationView.selectedItemId = R.id.item_my
                }
            }

            override fun onPageScrollStateChanged(state: Int) {}
        })
    }

}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/item_home"
        android:icon="@drawable/home"
        android:title="主页"
        />
    <item
        android:id="@+id/item_activity"
        android:icon="@drawable/activity"
        android:title="活动"
        />
    <item
        android:id="@+id/item_send"
        android:icon="@drawable/send"
        android:title="发布"
        />
    <item
        android:id="@+id/item_list"
        android:icon="@drawable/list"
        android:title="动态"
        />
    <item
        android:id="@+id/item_my"
        android:icon="@drawable/personal"
        android:title="我的"
        />
</menu>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".mainFragment.EntryFragment"
    android:background="@color/white"
    >


    <Button
        android:id="@+id/loginbutton"
        android:layout_width="184dp"
        android:layout_height="60dp"
        android:background="@drawable/liner_style"
        android:text="登录"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.785" />

    <Button
        android:id="@+id/registerbutton"
        android:layout_width="182dp"
        android:layout_height="55dp"
        android:layout_marginEnd="112dp"
        android:background="@drawable/liner_style"
        android:text="注册"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.902" />

    <ImageView
        android:id="@+id/imageView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/entry"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />


</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="@color/white"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".mainFragment.LoginFragment">


    <ImageView
        android:id="@+id/imageView"
        android:layout_width="411dp"
        android:layout_height="1072dp"
        android:layout_marginBottom="52dp"
        android:src="@drawable/login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent" />

    <EditText
        android:id="@+id/no"
        android:layout_width="202dp"
        android:layout_height="48dp"
        android:layout_marginTop="440dp"
        android:background="@drawable/liner_style"
        android:hint="请输入账号"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.347"
        app:layout_constraintStart_toEndOf="@+id/imageView3"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/password"
        android:layout_width="200dp"
        android:layout_height="51dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="64dp"
        android:background="@drawable/liner_style"
        android:hint="请输入密码"
        android:inputType="textPassword"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toEndOf="@+id/imageView4"
        app:layout_constraintTop_toBottomOf="@+id/no"
        app:layout_constraintVertical_bias="0.052" />

    <Button
        android:id="@+id/login"
        android:layout_width="290dp"
        android:layout_height="54dp"
        android:layout_marginBottom="12dp"
        android:background="@drawable/liner_style"
        android:text="Login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.495"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.813" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="84dp"
        android:text="还没有账号？"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.196"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/login"
        app:layout_constraintVertical_bias="0.148" />

    <TextView
        android:id="@+id/register"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginTop="95dp"
        android:text="点击注册"
        android:textColor="@color/blue"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="@+id/login"
        app:layout_constraintVertical_bias="0.026" />

    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="53dp"
        android:layout_height="49dp"
        android:layout_marginStart="64dp"
        android:layout_marginTop="440dp"
        android:src="@drawable/user"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="54dp"
        android:layout_height="53dp"
        android:layout_marginStart="64dp"
        android:layout_marginTop="16dp"
        android:src="@drawable/password"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView3"
        app:layout_constraintVertical_bias="0.069" />


</androidx.constraintlayout.widget.ConstraintLayout>

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    tools:context=".mainFragment.RegisterFragment">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="411dp"
        android:layout_height="1072dp"
        android:layout_marginBottom="200dp"
        android:src="@drawable/register" />
    <EditText
        android:id="@+id/no"
        android:layout_width="202dp"
        android:layout_height="48dp"
        android:layout_marginTop="460dp"
        android:layout_marginStart="140dp"
        android:background="@drawable/liner_style"
        android:hint="请输入账号"
         />

    <EditText
        android:id="@+id/password"
        android:layout_width="200dp"
        android:layout_height="51dp"
        android:layout_marginStart="140dp"
        android:layout_marginTop="520dp"
        android:layout_marginEnd="64dp"
        android:background="@drawable/liner_style"
        android:hint="请输入密码"
        android:inputType="textPassword" />

    <EditText
        android:id="@+id/repassword"
        android:layout_width="200dp"
        android:layout_height="51dp"
        android:layout_marginStart="140dp"
        android:layout_marginTop="580dp"
        android:layout_marginEnd="64dp"
        android:background="@drawable/liner_style"
        android:hint="确认用户名"
        />

    <Button
        android:id="@+id/login"
        android:layout_width="290dp"
        android:layout_height="54dp"
        android:layout_marginStart="60dp"
        android:layout_marginTop="640dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:background="@drawable/liner_style"
        android:text="Register" />


    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="53dp"
        android:layout_height="49dp"
        android:layout_marginStart="64dp"
        android:layout_marginTop="460dp"
        android:src="@drawable/user" />

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="54dp"
        android:layout_height="53dp"
        android:layout_marginStart="64dp"
        android:layout_marginTop="520dp"
        android:src="@drawable/password" />

    <ImageView
        android:id="@+id/imageView5"
        android:layout_width="53dp"
        android:layout_height="49dp"
        android:layout_marginStart="64dp"
        android:layout_marginTop="580dp"
        android:src="@drawable/ic__check" />

</RelativeLayout>