1.引入依赖库
implementation 'com.android.support:design:27.1.1'
如果出现版本错误,把conpileSdkVersion和targetSdkVersion的版本改成27.
2.布局文件
<android.support.design.widget.TabLayout
android:id="@+id/login_tablayout"
android:textDirection="firstStrong"
android:layout_width="match_parent"
app:tabSelectedTextColor="@color/colorPrimary"
app:tabIndicatorHeight="1dp"
app:tabIndicatorColor="#4092f7"
android:layout_height="40dp">
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/login_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
3.自定义myAdapter继承FragmentPagerAdapter
public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
private String[] titles;
private List<Fragment> fragmentList;
public MyFragmentPagerAdapter(FragmentManager fragmentManager, List<Fragment> fragments, String[] titles) {
super(fragmentManager);
fragmentList = fragments;
this.titles = titles;
}
@Override
public Fragment getItem(int position) {
Fragment fragment;
if (position < titles.length) {
fragment = fragmentList.get(position);
} else {
fragment = fragmentList.get(0);
}
return fragment;
}
@Override
public int getCount() {
return titles.length;
}
@Override
public CharSequence getPageTitle(int position) {
if (titles != null && titles.length > 0)
return titles[position];
return null;
}
}
4.根据自己需要创建Fragment的个数。new --> Fragment --> Fragment(Black)
5.修改MainActivity.java
public class MainActivity extends AppCompatActivity {
private TabLayout login_tablayout;
private ViewPager login_viewpager;
private List<Fragment> fragments;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
login_tablayout = (TabLayout)findViewById(R.id.login_tablayout);
login_viewpager = (ViewPager)findViewById(R.id.login_viewpager);
//账号密码登录(text_login) 手机号登录(phone_login)
fragments = new ArrayList<>();
fragments.add(new Fragment1());
fragments.add(new Fragment2());
final String[] titles = {"手机快捷登录","账号密码的登录"};
MyFragmentPagerAdapter adapter = new MyFragmentPagerAdapter(getSupportFragmentManager(),fragments,titles);
login_viewpager.setAdapter(adapter);
login_tablayout.setupWithViewPager(login_viewpager);
}
}
最终效果