使用Kotlin在Android应用中创建TabLayout的方法?
此示例演示如何使用Kotlin在Android应用中创建TabLayout。
步骤1 − 在Android Studio中创建一个新项目,转到文件?新建项目,并填写所有必需的详细信息以创建新项目。
步骤2 − 将以下代码添加到res/layout/activity_main.xml。
示例
<?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" tools:context=".MainActivity"> <com.google.android.material.tabs.TabLayout android:id="@+id/tabLayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#1db995"> </com.google.android.material.tabs.TabLayout> <androidx.viewpager.widget.ViewPager android:id="@+id/viewPager" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tabLayout" android:layout_centerInParent="true" android:layout_marginTop="100dp" tools:layout_editor_absoluteX="8dp" /> </RelativeLayout>
步骤3 − 将以下代码添加到src/MainActivity.kt
import android.os.Bundle import androidx.appcompat.app.AppCompatActivity import androidx.viewpager.widget.ViewPager import com.google.android.material.tabs.TabLayout import com.google.android.material.tabs.TabLayout.OnTabSelectedListener import com.google.android.material.tabs.TabLayout.TabLayoutOnPageChangeListener class MainActivity : AppCompatActivity() { lateinit var tabLayout: TabLayout lateinit var viewPager: ViewPager override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" tabLayout = findViewById(R.id.tabLayout) viewPager = findViewById(R.id.viewPager) tabLayout.addTab(tabLayout.newTab().setText("Football")) tabLayout.addTab(tabLayout.newTab().setText("Cricket")) tabLayout.addTab(tabLayout.newTab().setText("NBA")) tabLayout.tabGravity = TabLayout.GRAVITY_FILL val adapter = MyAdapter(this, supportFragmentManager, tabLayout.tabCount) viewPager.adapter = adapter viewPager.addOnPageChangeListener(TabLayoutOnPageChangeListener(tabLayout)) tabLayout.addOnTabSelectedListener(object : OnTabSelectedListener { override fun onTabSelected(tab: TabLayout.Tab) { viewPager.currentItem = tab.position } override fun onTabUnselected(tab: TabLayout.Tab) {} override fun onTabReselected(tab: TabLayout.Tab) {} }) } }
步骤4 − 创建一个新的适配器Kotlin类(MyAdapter.kt)并添加以下代码−
import android.content.Context import androidx.fragment.app.Fragment import androidx.fragment.app.FragmentManager import androidx.fragment.app.FragmentPagerAdapter @Suppress("DEPRECATION") internal class MyAdapter( var context: Context, fm: FragmentManager, var totalTabs: Int ) : FragmentPagerAdapter(fm) { override fun getItem(position: Int): Fragment { return when (position) { 0 -> { Football() } 1 -> { Cricket() } 2 -> { NBA() } else -> getItem(position) } } override fun getCount(): Int { return totalTabs } }
步骤5 − 创建3个Fragment活动(板球、足球、NBA - 你可以自己命名)和以下代码−
Cricket.kt
import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.fragment.app.Fragment class Cricket : Fragment() { override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_cricket, container, false) } }
fragment_cricket.xml
<?xml version="1.0" encoding="utf-8"?> <FrameLayout 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=".Cricket"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="Cricket Fragment" android:textAlignment="center" android:textSize="16sp" android:textStyle="bold" /> </FrameLayout>
Football.kt
import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.fragment.app.Fragment class Football : Fragment() { override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_football, container, false) } }
fragment_footbal.xml
<?xml version="1.0" encoding="utf-8"?> <FrameLayout 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=".Football"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="Football Fragment" android:textAlignment="center" android:textSize="16sp" android:textStyle="bold" /> </FrameLayout>
NBA.kt
import android.os.Bundle import androidx.fragment.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup class NBA : Fragment() { override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_n_b_a, container, false) } }
fragment_n_b_a.xml
<?xml version="1.0" encoding="utf-8"?> <FrameLayout 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=".NBA"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="NBA Fragment" android:textAlignment="center" android:textSize="16sp" android:textStyle="bold" /> </FrameLayout>
步骤6 − 将以下代码添加到androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要在Android Studio中运行应用程序,请打开您项目中的一个活动文件,然后单击运行图标 从工具栏。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕
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