TabLayout + ViewPager + Fragment实现类似新闻栏目动态切换_综合

1，此次文章讲述如何利用TabLayout + ViewPager + Fragment结构做一个内容切换；

主要类文件和布局文件：
1个adapter适配器文件，如：scanFragmentPagerAdapter；
2个class类文件+1个主class类文件，如：ScanFragment1，ScanFragment2，MyActivityFragment；
2个子布局文件+1个TabLayout + ViewPager布局界面；如：conent_fargment，scanfragment1，scanfragment2；

2，其次需要注意的是需要导入包文件，放置在app-bulide下，26.1.0是根据你当前android版本号来引入：

 compile 'com.android.support:appcompat-v7:26.1.0'compile 'com.android.support:design:26.1.0'

3，好，具体的思路/类文件，配置文件都弄清楚了，接下来看：

conent_fargment布局界面：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/drawer_layout"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayout 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"android:orientation="vertical"tools:context="com.noonecode.tablayoutdemo.MainActivity"><android.support.design.widget.TabLayoutandroid:id="@+id/tablayout2"android:layout_width="match_parent"android:layout_height="wrap_content" /><android.support.v4.view.ViewPagerandroid:id="@+id/viewpager2"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"></android.support.v4.view.ViewPager></LinearLayout>
</android.support.v4.widget.DrawerLayout>

scanfragment1，scanfragment2布局，我这儿就建立一个了。

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout  xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"android:layout_height="match_parent">
<LinearLayout  android:layout_width="match_parent"android:layout_height="wrap_content"><TextView  android:layout_width="match_parent"android:layout_height="wrap_content"android:text="11111"/></LinearLayout></android.support.constraint.ConstraintLayout>

scanFragmentPagerAdapter适配器界面：

public class scanFragmentPagerAdapter extends FragmentPagerAdapter {
    private int num;private HashMap<Integer, Fragment> mFragmentHashMap = new HashMap<>();public scanFragmentPagerAdapter(FragmentManager fm, int num) {super(fm);this.num = num;}@Overridepublic Fragment getItem(int position) {return createFragment(position);}@Overridepublic int getCount() {return num;}private Fragment createFragment(int pos) {Fragment fragment1 = mFragmentHashMap.get(pos);if (fragment1 == null) {switch (pos) {case 0:fragment1 = new ScanFragment1();Log.i("fragment", "fragment1");break;case 1:fragment1 = new ScanFragment2();Log.i("fragment", "fragment2");break;}mFragmentHashMap.put(pos, fragment1);}return fragment1;}
}

ScanFragment1，ScanFragment2类文件，也同上，只创建一个，剩余的自己需要几个就建立几个类文件；

public class ScanFragment1 extends Fragment{
    @Nullable@Overridepublic View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {return inflater.inflate( R.layout.scanfragment1, container, false);}
}

MyActivityFragment主文件：

public class MyActivityFragment extends AppCompatActivity implements View.OnClickListener {
    
// private LinearLayout back;private TabLayout tabLayout2;private ViewPager viewPager2;private Button tiaozhuan1;private List<Fragment> list2;private MyAdapter adapter2;private String[] titles = {
   "用户", "标签"};protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView( R.layout.conent_fargment);viewPager2 = (ViewPager) findViewById(R.id.viewpager2);tabLayout2 = (TabLayout) findViewById(R.id.tablayout2);
// back = findViewById(R.id.back);
// back.setOnClickListener(this);list2 = new ArrayList<>();list2.add(new ScanFragment1());list2.add(new ScanFragment2());//ViewPager的适配器adapter2 = new MyAdapter(getSupportFragmentManager());viewPager2.setAdapter(adapter2);//绑定tabLayout2.setupWithViewPager(viewPager2);//实例化}@Overridepublic void onClick(View v) {
// switch (v.getId()){
    
// case R.id.back:
// finish();
// break;
// }}class MyAdapter extends FragmentPagerAdapter {public MyAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int position) {return list2.get(position);}@Overridepublic int getCount() {return list2.size();}//重写这个方法，将设置每个Tab的标题@Overridepublic CharSequence getPageTitle(int position) {return titles[position];}}
}

讲述结束完毕，主要归纳就这7就文件，若你们需求listview，只需要在当前类文件引入listview和适配器就ok，若有疑问或不懂者可以私信，评论！谢谢！！