如何在Android应用中创建选项卡布局？

此示例演示了如何在Android应用中创建选项卡布局。

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一个新项目。

步骤2 - 添加以下依赖项以创建选项卡布局 -

implementation 'com.android.support:design:28.0.0'

步骤3 - 将以下代码添加到res/layout/activity_main.xml。

<?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">
   <android.support.design.widget.TabLayout
      android:id="@+id/tabLayout"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="#1db995">
   </android.support.design.widget.TabLayout>
   <android.support.v4.view.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4 - 将以下代码添加到src/MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
public class MainActivity extends AppCompatActivity {
   TabLayout tabLayout;
   ViewPager viewPager;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      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.setTabGravity(TabLayout.GRAVITY_FILL);
      final MyAdapter adapter = new MyAdapter(this,getSupportFragmentManager(),
      tabLayout.getTabCount());
      viewPager.setAdapter(adapter);
      viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
      tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
         @Override
         public void onTabSelected(TabLayout.Tab tab) {
            viewPager.setCurrentItem(tab.getPosition());
         }
         @Override
         public void onTabUnselected(TabLayout.Tab tab) {
         }
         @Override
         public void onTabReselected(TabLayout.Tab tab) {
         }
      });
   }
}

步骤5 - 创建一个Java类（MyAdapter.java）并添加以下代码 -

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentManager;
class MyAdapter extends FragmentPagerAdapter {
   Context context;
   int totalTabs;
   public MyAdapter(Context c, FragmentManager fm, int totalTabs) {
      super(fm);
      context = c;
      this.totalTabs = totalTabs;
   }
   @Override
   public Fragment getItem(int position) {
      switch (position) {
         case 0:
            Football footballFragment = new Football();
         return footballFragment;
         case 1:
            Cricket cricketFragment = new Cricket();
         return cricketFragment;
         case 2:
            NBA nbaFragment = new NBA();
         return nbaFragment;
         default:
         return null;
      }
   }
   @Override
   public int getCount() {
      return totalTabs;
   }
}

步骤6 - 现在创建片段和布局（右键单击项目>>新建>>片段>>空白 -

a) FootBall.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Football extends Fragment {
   public Football() {
      // Required empty public constructor
   }
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
      return inflater.inflate(R.layout.fragment_football, container, false);
   }
}

fragment_football.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:textAlignment="center"
      android:text="Football Fragment"
      android:textSize="16sp"
      android:textStyle="bold"/>
</FrameLayout>

b) Cricket.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Cricket extends Fragment {
   public Cricket() {
      // Required empty public constructor
   }
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
      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">
   <TextView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:textAlignment="center"
      android:text="Cricket Fragment"
      android:textSize="16sp"
      android:textStyle="bold"/>
</FrameLayout>

c) NBA.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class NBA extends Fragment {
   public NBA() {
      // Required empty public constructor
   }
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
      return inflater.inflate(R.layout.fragment_nb, container, false);
   }
}

fragment_nba.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:textAlignment="center"
      android:text="NBA Fragment"
      android:textSize="16sp"
      android:textStyle="bold"/>
</FrameLayout>

步骤7 - 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="app.com.sample">
   <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。要从Android Studio运行应用程序，请打开您项目中的一个活动文件，然后单击工具栏中的运行图标。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 -