安卓作业----慕课移动互联网第六课作业

效果图

在这里插入图片描述

代码

主要布局 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tabHost"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/mi">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TabWidget
            android:layout_alignParentBottom="true"
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </TabWidget>
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="match_parent"
            android:layout_height="540dp">
            <LinearLayout
                android:id="@+id/layout_home"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/red"
                android:orientation="vertical"
                android:paddingTop="20dp"
                >
                <TextView
                    android:layout_gravity="center"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="主页"
                    android:layout_centerInParent="true"
                    android:textSize="30dp"/>
            </LinearLayout>

            <LinearLayout
                android:id="@+id/layout_menu"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/yellow"
                android:orientation="vertical"
                android:paddingTop="20dp">
                <TextView
                    android:layout_gravity="center"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="分类"
                    android:textSize="30dp"/>
            </LinearLayout>

            <LinearLayout
                android:id="@+id/layout_cart"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/green"
                android:orientation="vertical"
                android:paddingTop="20dp">
                <TextView
                    android:layout_gravity="center"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="购物车"
                    android:textSize="30dp"/>
            </LinearLayout>

            <LinearLayout
                android:id="@+id/layout_nickname"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/blue"
                android:orientation="vertical"
                android:paddingTop="20dp"
                >
                <TextView
                    android:layout_gravity="center"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="我的"
                    android:textSize="30dp" />
            </LinearLayout>
        </FrameLayout>

    </RelativeLayout>
</TabHost>

主逻辑代码 MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private TabHost mTabHost;

    private void init(){
        mTabHost = findViewById(R.id.tabHost);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //启动选项卡之前必须调用此方法
        mTabHost.setup();

        //想要加上图片，必须先新建一个tab icon布局文件，然后调用getTabView()方法，在底下，自己写的，返回一个view

        /**
         * newTabSpec("tabRed")      设置此选项卡的标记，单机事件触发后，String tabId就是这个
         *
         * .setIndicator(getTabView(R.drawable.home,"红色"))      设置选项卡张啥样
         *
         * .setContent(R.id.layout_red);        设置选项卡内容是哪一个layout
         */

        TabHost.TabSpec tsHome = mTabHost.newTabSpec("tabHome")
                .setIndicator(getTabView(R.drawable.home,"主页"))
                .setContent(R.id.layout_home);
        mTabHost.addTab(tsHome);

        TabHost.TabSpec tsMenu = mTabHost.newTabSpec("tabMenu")
                .setIndicator(getTabView(R.drawable.menu,"分类"))
                .setContent(R.id.layout_menu);
        mTabHost.addTab(tsMenu);

        TabHost.TabSpec tsCart = mTabHost.newTabSpec("tabCart")
                .setIndicator(getTabView(R.drawable.cart,"购物车"))
                .setContent(R.id.layout_cart);
        mTabHost.addTab(tsCart);

        TabHost.TabSpec tsNickname = mTabHost.newTabSpec("tabNickname")
                .setIndicator(getTabView(R.drawable.nickname,"我的"))
                .setContent(R.id.layout_nickname);
        mTabHost.addTab(tsNickname);

        //给选项卡增加监听事件
        mTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
            @Override
            public void onTabChanged(String tabId) {
                Toast.makeText(MainActivity.this,tabId,Toast.LENGTH_SHORT).show();
            }
        });

        //设置默认是哪个选项卡
        mTabHost.setCurrentTab(0);

    }

    //获取选项卡的样式，返回一个view 对象
    public View getTabView(int imgId,String text){
        LinearLayout linearLayout = (LinearLayout) LayoutInflater.from(MainActivity.this).inflate(R.layout.tabicon,null);
        ImageView imageView = linearLayout.findViewById(R.id.img);
        imageView.setBackgroundResource(imgId);

        TextView textView = linearLayout.findViewById(R.id.myText);
        textView.setText(text);

        return linearLayout;
    }
}

选项卡布局 tabicon.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <ImageView
        android:layout_gravity="center"
        android:id="@+id/img"
        android:layout_width="50dp"
        android:layout_height="50dp" />
    <TextView
        android:layout_gravity="center"
        android:id="@+id/myText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18dp"/>

</LinearLayout>

资源文件 colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#008577</color>
    <color name="colorPrimaryDark">#00574B</color>
    <color name="colorAccent">#D81B60</color>
    <color name="red">#F5BCBB</color>
    <color name="yellow">#FCE4A6</color>
    <color name="green">#BEEEC0</color>
    <color name="blue">#AEDFF1</color>
    <color name="mi">#F8F5D6</color>
</resources>