Android：TabLayout+ViewPager(可滑動頁籤)

Android中要建立可滑動標籤來達到分頁的功能，可以使用TabLayout讓你快速建好一個Tab元件

1.首先要導入2個函式庫到Gradle

• compile 'com.android.support:appcompat-v7:25.0.0'
• compile 'com.android.support:design:25.0.0'

2.在xml掛上TabLayout和ViewPager

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="tw.com.hjchen.tablayout.MainActivity">


    <android.support.design.widget.TabLayout
        android:id="@+id/pager_tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="fixed"
        app:tabGravity="fill"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_below="@id/pager_tabs"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</RelativeLayout>

3.建立一個ViewPager的xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView_item_main"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="MyPage:"/>

    <TextView
        android:id="@+id/textView_item_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="80sp" />

</LinearLayout>

4.MainActivity.java

import android.support.design.widget.TabLayout;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TabLayout mTabs;
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTabs = (android.support.design.widget.TabLayout) findViewById(R.id.pager_tabs);
        mTabs.addTab(mTabs.newTab().setText("Game"));
        mTabs.addTab(mTabs.newTab().setText("Music"));
        mTabs.addTab(mTabs.newTab().setText("Contact"));

        mViewPager = (ViewPager) findViewById(R.id.viewpager);
        mViewPager.setAdapter(new MyPagerAdapter());
        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabs));

        mTabs.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                mViewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

    }
    class MyPagerAdapter extends PagerAdapter {
        private int pageCount = 3;
        @Override
        public int getCount() {
            return pageCount;
        }

        @Override
        public boolean isViewFromObject(View view, Object obj) {
            return obj == view;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return "MyPage " + (position + 1);
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View view = getLayoutInflater().inflate(R.layout.my_pager_items, container, false);
            container.addView(view);
            TextView title = (TextView) view.findViewById(R.id.textView_item_title);
            title.setText("" + (position + 1));
            return view;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }
    }

}