一、前言：
Tablayout继承自HorizontalScrollView，用作页面切换指示器，因使用简便功能强大而广泛使用在App中。
先上效果图：分别为设置tab属性、去掉指示线、设置指示线长度、设置图标tab、超出屏幕滚动tab
图片.png
二、使用：
1、TabLayout的一些基本属性：
app:tabIndicatorColor ：指示线的颜色
app:tabIndicatorHeight ：指示线的高度
app:tabSelectedTextColor ： tab选中时的字体颜色
app:tabTextColor：tab未被选中时的字体颜色
app:tabMode="scrollable" ： 默认是fixed，固定的；scrollable：可滚动的
2、高度设置为0:
给tabIndicatorHeight属性设置0dp，或者给tabSelectedTextColor属性设置透明，就不显示指示线了。
app:tabIndicatorHeight ="0dp"
还可以设置成透明色：
app:tabIndicatorColor="@color/transparent"
3、设置默认图标：
图片.png
still easy，Tablayout自带了setIcon()方法设置图标资源，不过这中效果很别扭，脸被拉长了。不服，就自己造一个啊，造就造！
tabLayout.getTabAt(i).setText(titles[i]).setIcon(pics[i]);
4、自己造tab样式：
图片.png
创建图标和文字布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="48dp"
android:gravity="center">
<ImageView
android:id="@+id/imageview"
android:layout_gravity="center"
android:layout_width="24dp"
android:layout_height="24dp" />
<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="14sp"
android:layout_marginLeft="8dp"/>
</LinearLayout>
这里是图标居左，那我要改为图标上下左右呢？都自定义view了，你上天都行。
/**
* 设置自定义位置图标
*/
private void setCustomIcon() {
tabLayout2 = (TabLayout) findViewById(R.id.tablayout2);
for(int i=0;i<titles.length;i++){
tabLayout2.addTab(tabLayout2.newTab());
}
for(int i=0;i<titles.length;i++){
tabLayout2.getTabAt(i).setCustomView(makeTabView(i));
}
}
/**
* 引入布局设置图标和标题
* @param position
* @return
*/
private View makeTabView(int position){
View tabView = LayoutInflater.from(this).inflate(R.layout.tab_text_icon,null);
TextView textView = tabView.findViewById(R.id.textview);
ImageView imageView = tabView.findViewById(R.id.imageview);
textView.setText(titles[position]);
imageView.setImageResource(pics[position]);
return tabView;
}
5、tab数量太多，超出屏幕，就像今日头条的分类一样，那就挤在一起了啊。不怕，我们有app:tabMode="scrollable" 属性，让Tablayout变得可滚动，可超出屏幕。
图片.png
布局引入：
<android.support.design.widget.TabLayout
android:id="@+id/tablayout3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabSelectedTextColor="@color/green"
android:layout_marginTop="20dp"
app:tabMode="scrollable"
android:background="@color/white"/>
三、自己写的demo：
图片.png
1、activity
package com.example.day0801
import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import android.view.View
import android.widget.ImageView
import androidx.core.content.ContextCompat
import androidx.fragment.app.Fragment
import androidx.viewpager2.adapter.FragmentStateAdapter
import androidx.viewpager2.widget.ViewPager2
import com.example.day0801.databinding.ActivityMainBinding
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator
import androidx.databinding.DataBindingUtil
import com.example.day0801.databinding.SearchTabItemBinding
class MainActivity : AppCompatActivity() {
val tabNames = arrayListOf<String>()
val childFragments = arrayListOf<Fragment>()
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
childFragments.add(FirstFragment("第一个页面"))
childFragments.add(FirstFragment("第二个页面"))
childFragments.add(FirstFragment("第三个页面"))
childFragments.add(FirstFragment("第四个页面"))
childFragments.add(FirstFragment("第五个页面"))
tabNames.add("测试1")
tabNames.add("测试2")
tabNames.add("测试3")
tabNames.add("测试4")
tabNames.add("测试5")
//初始化tab
initTabButton()
}
private fun initTabButton() {
tabNames.forEachIndexed { _index, it ->
binding.tablayout.addTab(binding.tablayout.newTab().setText(it))
}
binding.viewpager.offscreenPageLimit = 1
binding.viewpager.adapter = fragmentAdapter
// 这里是Google的一个坑，注意应先设置监听器，再去添加tab，否则会出现第一次运行不执行onTabSelected方法
binding.viewpager.registerOnPageChangeCallback(object :
ViewPager2.OnPageChangeCallback() {
override fun onPageSelected(position: Int) {
}
})
binding.tablayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
override fun onTabSelected(tab: TabLayout.Tab?) {
updateTabView(tab, true)
tab?.position?.let {
binding.viewpager.setCurrentItem(it, true)
}
}
override fun onTabUnselected(tab: TabLayout.Tab?) {
updateTabView(tab, false)
}
override fun onTabReselected(tab: TabLayout.Tab?) {
}
})
TabLayoutMediator(binding.tablayout, binding.viewpager, false, true) { tab, position ->
tab.customView = getTabView(tabNames[position])
}.attach()
binding.tablayout.getTabAt(0)?.select()
}
private fun getTabView(tab: String): View {
val binding = DataBindingUtil.inflate<SearchTabItemBinding>(layoutInflater, R.layout.search_tab_item, null, true)
binding.tabName.text = tab
return binding.root
}
private fun updateTabView(tab: TabLayout.Tab?, isSelect: Boolean) {
Log.d("LUO", "updateTabView: tab=${tab?.position}, isSelectd=$isSelect")
tab?.let {
it.customView?.let {
val binding: SearchTabItemBinding = DataBindingUtil.bind<SearchTabItemBinding>(it)!!
val color = if (isSelect) {
ContextCompat.getColor(this, R.color.teal_200)
} else {
ContextCompat.getColor(this, R.color.ui_color_191c1c)
}
binding.tabName.setTextColor(color)
if (isSelect) {
val paint = binding.tabName.paint
paint.isFakeBoldText = true
binding.tabName.textSize = 16f
tab.customView?.findViewById<ImageView>(R.id.iv_indicator)?.apply {
visibility = View.VISIBLE
}
} else {
val paint = binding.tabName.paint
paint.isFakeBoldText = false
binding.tabName.textSize = 14f
tab.customView?.findViewById<ImageView>(R.id.iv_indicator)?.apply {
visibility = View.INVISIBLE
}
}
}
}
}
/**
* viewPager adapter
*/
private val fragmentAdapter: FragmentStateAdapter by lazy {
object : FragmentStateAdapter(this) {
override fun getItemCount(): Int {
return tabNames.size
}
override fun createFragment(position: Int): Fragment {
return childFragments[position]
}
}
}
}
2、activity_main
<?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=".MainActivity">
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="tab切换"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:textSize="22sp"
android:textColor="#f00"
/>
<com.google.android.material.tabs.TabLayout
android:id="@+id/tablayout"
android:layout_width="match_parent"
android:layout_height="44dp"
android:layout_marginTop="10dp"
android:shadowColor="#f0000000"
android:shadowDx="0"
android:shadowDy="2"
app:tabGravity="fill"
app:tabIndicatorFullWidth="false"
app:tabIndicatorHeight="0dp"
app:tabMinWidth="30dp"
app:tabMode="scrollable"
app:tabPaddingEnd="18dp"
app:tabPaddingStart="12dp"
app:tabRippleColor="@android:color/transparent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_title"
/>
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="2dp"
app:layout_constraintTop_toBottomOf="@+id/tablayout"
app:layout_constraintBottom_toBottomOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
3、FirstFragment
class FirstFragment(var tabName:String?="") : Fragment() {
private var _binding: FragmentFirstBinding? = null
// This property is only valid between onCreateView and
// onDestroyView.
private val binding get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentFirstBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.textviewFirst.text = tabName
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
}
4、fragment_first
<?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=".FirstFragment">
<TextView
android:id="@+id/textview_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_first_fragment"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="100dp"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
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