安卓 TabLayout+ViewPager实现滑动Tab效果

public class MainActivity extends FragmentActivity {

private ArrayList<Fragment> datas;
private ViewPager viewpager;
private SendAdapter adapter;
private TabLayout tablayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
datas = new ArrayList<>();
datas.add(new SendFragment());
datas.add(new CallHistoryFragment());
datas.add(new ContactPersonFragment());
datas.add(new MessageFragment());
viewpager = (ViewPager) findViewById(R.id.viewpager);//绑定viewpager
tablayout = (TabLayout) findViewById(R.id.tablayout);//绑定tablayout
adapter = new SendAdapter(getSupportFragmentManager(), datas);//初始化fragment类型adapter,datas为adapter构造函数参数
viewpager.setAdapter(adapter);//将adapter加入viewpager中
tablayout.setTabTextColors(Color.BLUE,Color.GREEN);//加入title选择和被选择的颜色,前面为未点击的颜色,后面为点击后的颜色
tablayout.setupWithViewPager(viewpager);//将tablayout与viewpager建立关系
}

public class SendAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> datas;//因为要用将fragment加入到viewpager之中,所以内容为fragment类型的集合

String title1 = "拨号";
String title2 = "最近通话";
String title3 = "联系人";
String title4 = "短信";
String [] titles = {title1,title2,title3,title4};//设置底部tablayoutout显示文字
public SendAdapter(FragmentManager fm, ArrayList<Fragment> datas) {//设置构造函数,将fragment传入到viewpager中
super(fm);
this.datas = datas;
}

@Override
public Fragment getItem(int position) {
return datas.get(position);
}

@Override
public int getCount() {
return datas.size();
}

@Override//tablayout和viewpager结合之后,创建底部title使用的方法
public CharSequence getPageTitle(int position) {
return titles[position];
}
}