Android Material Design:ViewPager与android.support.design.widget.TabLayout双向交互联动切换

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通常，android.support.design.widget.TabLayout与Android的ViewPager联合使用，实现与ViewPager的切换与联动。
（1）比如，当用户手指触摸选择TabLayout中的某一项时候，ViewPager应当自动切换跳转到相应的Page页面；
（2）同样，当用户在翻动ViewPager时候，TabLayout也会自动的滚动到与当前ViewPager页面像对应的子item tab并使该子item tab处于选中状态。

测试用的主Activity MainActivity.java ：

package com.zzw.testtablayout;import android.app.Activity;import android.os.Bundle;import android.support.design.widget.TabLayout;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class MainActivity extends Activity {    private final int COUNT = 10;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);        tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);        ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);        viewPager.setAdapter(new MyAdapter(this));        // TabLayout和ViewPager双向、交互联动。        tabLayout.setupWithViewPager(viewPager);    }    private class MyAdapter extends PagerAdapter {        private Activity activity;        public MyAdapter(Activity activity) {            this.activity = activity;        }        @Override        public CharSequence getPageTitle(int position) {            return "选项" + position;        }        @Override        public Object instantiateItem(View container, int position) {            TextView tv = new TextView(activity);            tv.setText("ViewPager" + position);            tv.setTextSize(30.0f);            tv.setGravity(Gravity.CENTER);            ((ViewGroup) container).addView(tv);            return tv;        }        @Override        public void destroyItem(View container, int position, Object object) {            ((ViewPager) container).removeView((View) object);        }        @Override        public int getCount() {            return COUNT;        }        @Override        public boolean isViewFromObject(View arg0, Object arg1) {            return arg0 == arg1;        }    }}

MainActivity.java需要的布局文件：activity_main.xml：

<LinearLayout 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:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <!-- app:tabIndicatorColor 指示器（字体下面的那一个横）显示颜色 -->    <!-- app:tabSelectedTextColor 选中的字体颜色 -->    <!-- app:tabTextColor 未选中的字体颜色 -->    <android.support.design.widget.TabLayout        android:id="@+id/tabLayout"        android:layout_width="match_parent"        android:layout_height="wrap_content"        app:tabIndicatorColor="#26c6da"        app:tabSelectedTextColor="#f44336"        app:tabTextColor="#bdbdbd" />    <android.support.v4.view.ViewPager        android:id="@+id/viewPager"        android:layout_weight="1"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

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