设计目标：

完成类微信的门户页面框架设计；

APP最少必须包含4个tab页面；

框架设计需要使用fragment，activity；

不得使用UNIAPP技术进行开发（H5或者小程序）。

功能说明：

在点击对应按钮时能实现页面切换；

点击图标后图标会发生变换。

代码解析：

将我们在阿里矢量图标网上下载的图标导入drawable文件夹：

在这里插入图片描述

top.xml 设置界面的顶部内容

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center"
        android:text="微信"
        android:textColor="@color/black"
        android:textSize="30sp" />
</LinearLayout>

bottom.xml 设置界面的底部内容

<?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="100dp"
    android:background="@color/design_default_color_surface"
    android:clickable="false"
    android:orientation="horizontal">

    <LinearLayout
        android:id="@+id/tab_weixin"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:clickable="true"
        android:gravity="center"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="match_parent"
            android:layout_height="57dp"
            android:src="@drawable/weixin1"
            tools:srcCompat="@drawable/weixin1" />

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="微信"
            android:textColor="@color/black"
            android:textSize="23sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/tab_tongxunlu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:clickable="true"
        android:gravity="center"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="103dp"
            android:layout_height="60dp"
            android:src="@drawable/tongxunlu1"
            tools:srcCompat="@drawable/tongxunlu1" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="通讯录"
            android:textColor="@color/black"
            android:textSize="23sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/tab_faxian"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:clickable="true"
        android:gravity="center"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="103dp"
            android:layout_height="63dp"
            android:src="@drawable/faxian1"
            tools:srcCompat="@drawable/faxian1" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="发现"
            android:textColor="@color/black"
            android:textSize="23sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/tab_shezhi"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:clickable="true"
        android:gravity="center"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imageView3"
            android:layout_width="match_parent"
            android:layout_height="62dp"
            android:src="@drawable/wo1"
            tools:srcCompat="@drawable/wo1" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="我"
            android:textColor="@color/black"
            android:textSize="23sp" />
    </LinearLayout>

</LinearLayout>

activity_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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <include layout="@layout/top"/>

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


    </FrameLayout>

    <include layout="@layout/bottom" />
</LinearLayout>

interface1.xml 设置微信界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".weixinFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="微信界面"
        android:textSize="30sp"/>

</LinearLayout>

interface2.xml 设置通讯录界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".tongxunluFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="通讯录界面"
        android:textSize="30sp"/>

</LinearLayout>

interface3.xml 设置发现界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".faxianFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="发现界面"
        android:textSize="30sp"/>

</LinearLayout>

interface4.xml 设置我界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".woFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="我界面"
        android:textSize="30sp"/>

</LinearLayout>

weixinFragment 将结尾选中区域改成interface1

package com.example.wechat;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * A simple {@link Fragment} subclass.
 * Use the  factory method to
 * create an instance of this fragment.
 */
public class weixinFragment extends Fragment {



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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.interface1, container, false);
    }
}

tongxunluFragment 将结尾选中区域改成interface2

package com.example.wechat;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * A simple {@link Fragment} subclass.
 * Use the  factory method to
 * create an instance of this fragment.
 */
public class tongxunluFragment extends Fragment {



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


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.interface2, container, false);
    }
}

faxianFragment 将结尾选中区域改成interface3

package com.example.wechat;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * A simple {@link Fragment} subclass.
 * Use the  factory method to
 * create an instance of this fragment.
 */
public class faxianFragment extends Fragment {


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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.interface3, container, false);
    }
}

woFragment 将结尾选中区域改成interface4

package com.example.wechat;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * A simple {@link Fragment} subclass.
 * Use the  factory method to
 * create an instance of this fragment.
 */
public class woFragment extends Fragment {



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



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.interface4, container, false);
    }
}

MainActivity 在onCreate函数中调用所需要的函数：使用initFragment函数添加界面；使用initView函数进行视图选择；使用initEvent函数做事件触发；使用showfragment函数设置内容；使hidefragment函数让其他选项区变暗；使用onClick函数对点击某个区域起反应；使用resetImage函数设置灰暗图标的图片。

package com.example.wechat;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Fragment weixin = new weixinFragment();
    private Fragment tongxunlu = new tongxunluFragment();
    private Fragment faxian = new faxianFragment();
    private Fragment wo = new woFragment();

    private LinearLayout mTabWeChat;
    private LinearLayout mTabFrd;
    private LinearLayout mTabContact;
    private LinearLayout mTabSettings;

    private ImageView imageWeixin,imagetongxunlu,imagefaxian,imageshezhi;

    private FragmentManager fm;
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        textView=findViewById(R.id.textView2);

        mTabWeChat=findViewById(R.id.tab_weixin);
        mTabFrd=findViewById(R.id.tab_tongxunlu);
        mTabContact=findViewById(R.id.tab_faxian);
        mTabSettings=findViewById(R.id.tab_shezhi);

        imageWeixin=findViewById(R.id.imageView);
        imagetongxunlu=findViewById(R.id.imageView1);
        imagefaxian=findViewById(R.id.imageView2);
        imageshezhi=findViewById(R.id.imageView3);

        initEvent();
        initFragment();
        showfragment(0);
    }


    private void initFragment() {
        fm = getSupportFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();
        transaction.add(R.id.content, weixin);
        transaction.add(R.id.content, tongxunlu);
        transaction.add(R.id.content, faxian);
        transaction.add(R.id.content, wo);
        transaction.commit();
    }

    private void initView() {
        mTabWeChat = (LinearLayout) findViewById(R.id.tab_weixin);
        mTabFrd = (LinearLayout) findViewById(R.id.tab_tongxunlu);
        mTabContact = (LinearLayout) findViewById(R.id.tab_faxian);
        mTabSettings = (LinearLayout) findViewById(R.id.tab_shezhi);

    }

    private void initEvent() {
        mTabWeChat.setOnClickListener(this);
        mTabFrd.setOnClickListener(this);
        mTabContact.setOnClickListener(this);
        mTabSettings.setOnClickListener(this);
    }

    private void showfragment(int i){
        FragmentTransaction transaction=fm.beginTransaction();
        hideFragment(transaction);
        switch (i){
            case 0:
                textView.setText("微信");
                transaction.show(weixin);
                imageWeixin.setImageResource(R.drawable.weixin2);
                break;

            case 1:
                textView.setText("通讯录");
                transaction.show(tongxunlu);
                imagetongxunlu.setImageResource(R.drawable.tongxunlu2);
                break;

            case 2:
                textView.setText("发现");
                transaction.show(faxian);
                imagefaxian.setImageResource(R.drawable.faxian2);
                break;

            case 3:
                textView.setText("我");
                transaction.show(wo);
                imageshezhi.setImageResource(R.drawable.wo2);
                break;

            default:
                break;
        }
        transaction.commit();
    }


    private void hideFragment(FragmentTransaction transaction) {
        transaction.hide(weixin);
        transaction.hide(tongxunlu);
        transaction.hide(faxian);
        transaction.hide(wo);

    }

    public void onClick(View v) {
        resetImage();
        switch (v.getId()){
            case R.id.tab_weixin:
                showfragment(0);
                break;
            case R.id.tab_tongxunlu:
                showfragment(1);
                break;
            case R.id.tab_faxian:
                showfragment(2);
                break;
            case R.id.tab_shezhi:
                showfragment(3);
                break;
            default:
                break;
        }

    }
    public void resetImage(){
        imageWeixin.setImageResource(R.drawable.weixin1);
        imagetongxunlu.setImageResource(R.drawable.tongxunlu1);
        imagefaxian.setImageResource(R.drawable.faxian1);
        imageshezhi.setImageResource(R.drawable.wo1);
    }
}