Android ViewPager加TabLayout

佈局
使用TabLayout需要新增依賴

implementation 'com.android.support:design:26.1.0'

<android.support.v4.view.ViewPager android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_weight="10"
        android:layout_height="0dp"></android.support.v4.view.ViewPager>
    <android.support.design.widget.TabLayout android:id="@+id/tab"
        android:layout_width="match_parent"
        android:layout_weight="1"
        android:layout_height="0dp"></android.support.design.widget.TabLayout>
 

讓他有三個滑動頁面，需要建立三個Fragment。
當然，當Fragment多時建立那那麼多Fragment有點麻煩，這時也可以採用Fragment複用，我就直接建立三個Fragment了。

Activity主程式碼
TabLayout下標題需要泛型為String的集合

	TabLayout tabLayout=findViewById(R.id.tab);
        ViewPager viewPager=findViewById(R.id.vp);
	ArrayList<String> title=new ArrayList<>();
        title.add("a");
        title.add("b");
        title.add("c");
        ArrayList<Fragment> list=new ArrayList<>();
        BlankFragment1 blankFragment1=new BlankFragment1();
        BlankFragment2 blankFragment2=new BlankFragment2();
        BlankFragment3 blankFragment3=new BlankFragment3();
        list.add(blankFragment1);
        list.add(blankFragment2);
        list.add(blankFragment3);
        MyAdapter_vp myAdapter_vp=new MyAdapter_vp(getSupportFragmentManager(),title,list);
        viewPager.setAdapter(myAdapter_vp);
        tabLayout.setupWithViewPager(viewPager);
 

MyAdapter_vp 為ViewPager加TabLayout的介面卡

	private ArrayList<String> title;
    private ArrayList<Fragment> list;

    public MyAdapter_vp(FragmentManager fm, ArrayList<String> title, ArrayList<Fragment> list) {
        super(fm);
        this.title = title;
        this.list = list;
    }

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

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

    @Override
    public CharSequence getPageTitle(int position) {
        return title.get(position);
    }
 

OK了，如果有什麼問題可以評論給我！