第7天ViewPagerViewPager+Fragment+TabLayout新闻头部标题导航（*****）
ViewPager
一.效果
二.思路：1个ViewPager+5个Fragment+1个FragmentPagerAdapter+TabLayout
1.容器：ViewPager
2.数据：ArrayList<Fragment ArrayList<String 标题
3.适配器：FragmentViewPager
4.TabLayout：需要导入依赖
重写的方法：
（1）getCount()：返回数据源的总数量
（2）getItem():
（3）getPageTitle():返回标题
三.代码
（1）导入依赖：implementation 'com.android.support:design:27.0.0’或者
implementation ‘com.android.support:design:28.0.0’
（2）布局activity_main.xml:ViewPager+TabLayout
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical"> <!--tabLayout依赖--> <android.support.design.widget.TabLayout app:tabSelectedTextColor="#E5AF35" app:tabTextColor="#969696" app:tabIndicatorColor="#E5AF35" app:tabIndicatorHeight="5dp" app:tabMode="scrollable" android:id="@+id/tb" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> </android.support.design.widget.TabLayout> <android.support.v4.view.ViewPager android:id="@+id/vp" android:layout_weight="8" android:layout_height="0dp" android:layout_width="match_parent"> </android.support.v4.view.ViewPager> </LinearLayout> (3)Java代码：MainActivity.java
public class MainActivity extends AppCompatActivity { //视图 private ViewPager vp; private TabLayout tb; //数据 private ArrayList<Fragment> fragment_list=new ArrayList<>(); private ArrayList<String> title_list=new ArrayList<>();//标题 //适配器 private MyFragmentPagerAdapter myFragmentPagerAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); supportRequestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); initview(); initdata(); initadpater(); //TODO tablayout和viewpager联系在一起 tb.setupWithViewPager(vp); } private void initadpater() { myFragmentPagerAdapter=new MyFragmentPagerAdapter(getSupportFragmentManager(),fragment_list,title_list); vp.setAdapter(myFragmentPagerAdapter); } private void initdata() { fragment_list.add(new Fragment1()); fragment_list.add(new Fragment2()); fragment_list.add(new Fragment3()); fragment_list.add(new Fragment4()); title_list.add("我的"); title_list.add("新闻"); title_list.add("最热"); title_list.add("最强"); } private void initview() { vp=findViewById(R.id.vp); tb=findViewById(R.id.tb); } } （4）适配器代码：MyFragmentPagerAdapter.java
public class MyFragmentPagerAdapter extends FragmentPagerAdapter { private ArrayList<Fragment> fragment_list; private ArrayList<String> title_list; public MyFragmentPagerAdapter(FragmentManager fm, ArrayList<Fragment> fragment_list,ArrayList<String> titile_list) { super(fm); this.fragment_list=fragment_list; this.title_list=titile_list; } @Override public Fragment getItem(int i) { return fragment_list.get(i); } @Override public int getCount() { return fragment_list.size(); } //TODO 返回对应的标题 @Nullable @Override public CharSequence getPageTitle(int position) { return title_list.get(position); } } 源代码：
文章来源: https://blog.csdn.net/qq_34178710/article/details/91842139