帶有 TabLayout 的 ViewPager
一個 TabLayout
可用於更方便的導航。
你可以使用 TabLayout.newTab()
方法為介面卡中的每個片段設定選項卡,但還有另一種更方便,更簡單的方法,即 TabLayout.setupWithViewPager()
。
每次呼叫時,此方法都會根據與 ViewPager
關聯的介面卡的內容建立和刪除選項卡進行同步。
此外,它將設定回撥,因此每次使用者翻頁時,都會選擇相應的選項卡。
只需定義一個佈局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
app:tabMode="scrollable" />
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1" />
</LinearLayout>
然後實現 FragmentPagerAdapter
並將其應用於 ViewPager
:
public class MyViewPagerActivity extends AppCompatActivity {
private static final String TAG = MyViewPagerActivity.class.getName();
private MyPagerAdapter mFragmentAdapter;
private ViewPager mViewPager;
private TabLayout mTabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.myActivityLayout);
// Get the ViewPager and apply the PagerAdapter
mFragmentAdapter = new MyPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.view_pager);
mViewPager.setAdapter(mFragmentAdapter);
// link the tabLayout and the viewpager together
mTabLayout = (TabLayout) findViewById(R.id.tab_layout);
mTabLayout.setupWithViewPager(mViewPager);
}
private class MyPagerAdapter extends FragmentPagerAdapter{
public MyPagerAdapter(FragmentManager supportFragmentManager) {
super(supportFragmentManager);
}
// Returns the fragment to display for that page
@Override
public Fragment getItem(int position) {
switch(position) {
case 0:
return new Fragment1();
case 1:
return new Fragment2();
case 2:
return new Fragment3();
default:
return null;
}
}
// Will be displayed as the tab's label
@Override
public CharSequence getPageTitle(int position) {
switch(position) {
case 0:
return "Fragment 1 title";
case 1:
return "Fragment 2 title";
case 2:
return "Fragment 3 title";
default:
return null;
}
}
// Returns total number of pages
@Override
public int getCount() {
return 3;
}
}
}