Android基础——高级UI组件：选项卡

布局文件

<?xml version="1.0" encoding="utf-8"?>
<TabHost 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=".MainActivity"
    android:orientation="vertical"
    android:id="@android:id/tabhost"
    >
<!--选项卡里面需要两个布局文件：一个是上面标签的布局，一个是下面内容的布局-->
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TabWidget
            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="match_parent">
        </FrameLayout>
    </LinearLayout>


</TabHost>

两个子布局文件

<?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"
    android:id="@+id/left"
    >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/a"
        />


</LinearLayout>

<?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"
    android:id="@+id/right"
    >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/b"
        />


</LinearLayout>

java调用

package com.example.myhighuiiiii;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TabHost;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    TabHost tabHost = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tabHost = (TabHost) findViewById(android.R.id.tabhost);
        tabHost.setup();

        //加载两个标签页tab1,tab2的布局文件
        LayoutInflater inflater = LayoutInflater.from(this);
        inflater.inflate(
                R.layout.tab1,tabHost.getTabContentView()
        );
        inflater.inflate(
                R.layout.tab2,tabHost.getTabContentView()
        );

        //添加第一个标签页
        tabHost.addTab(
                tabHost.newTabSpec("tab1")
                        .setIndicator("精选表情")
                        .setContent(R.id.left));
        //添加第二个标签页
        tabHost.addTab(
                tabHost.newTabSpec("tab2")
                        .setIndicator("投稿精选")
                        .setContent(R.id.right));
    }
}