Android開發之TabLayout實現頂部選單

在Android開發中，經常要使用頂部選單，如網易新聞、今日頭條等，實現頂部選單以前是ViewPager配合PagerTabStrip來實現，但Android 5.0以後，推薦大家使用MD中的TabLayout來實現，很簡單哦~~

開發環境：Android Studio

開發步驟

• 1、在 build.gradle 匯入 com.android.support:design:22.2.1
• 2、Activity佈局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="48dp" //選單高度
        android:background="#1FBCD2" //選單條的背景
        app:tabIndicatorColor="#ff0000" //選單指示器的顏色
        app:tabMode="scrollable" //選單可以滾動
        app:tabPaddingEnd="20dp" 
        app:tabPaddingStart="20dp" //選單之間的間距
        app:tabSelectedTextColor="#FFFFFF" //選單選中時的顏色
        app:tabTextColor="#000000"> //選單未選中時的顏色
    </android.support.design.widget.TabLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/vp_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>
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• 3、Activity程式碼

public class MainActivity extends Activity {

    private TabLayout mTabLayout;
    private ViewPager mViewPager;
    private LayoutInflater mInflater;
    private List<String> mTitleList = new ArrayList<String>();//頁卡標題集合
    private View view1, view2, view3, view4, view5, view6, view7, view8;//頁卡檢視
    private List<View> mViewList = new ArrayList<>();//頁卡檢視集合

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mViewPager = (ViewPager) findViewById(R.id.vp_view);
        mTabLayout = (TabLayout) findViewById(R.id.tabs);
        mInflater = LayoutInflater.from(this);

        view1 = mInflater.inflate(R.layout.content, null);
        view2 = mInflater.inflate(R.layout.content, null);
        view3 = mInflater.inflate(R.layout.content, null);
        view4 = mInflater.inflate(R.layout.content, null);
        view5 = mInflater.inflate(R.layout.content, null);
        view6 = mInflater.inflate(R.layout.content, null);
        view7 = mInflater.inflate(R.layout.content, null);
        view8 = mInflater.inflate(R.layout.content, null);
        //新增頁卡檢視
        mViewList.add(view1);
        mViewList.add(view2);
        mViewList.add(view3);
        mViewList.add(view4);
        mViewList.add(view5);
        mViewList.add(view6);
        mViewList.add(view7);
        mViewList.add(view8);
       //新增頁卡標題
        mTitleList.add("頭條");
        mTitleList.add("熱點");
        mTitleList.add("本地");
        mTitleList.add("財經");
        mTitleList.add("科技");
        mTitleList.add("教育");
        mTitleList.add("體育");
        mTitleList.add("笑話");
       //新增tab選項卡，預設第一個選中
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(0)), true);
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(1)));
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(2)));
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(3)));
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(4)));
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(5)));
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(6)));
        mTabLayout.addTab(mTabLayout.newTab().setText(mTitleList.get(7)));


        MyPagerAdapter mAdapter = new MyPagerAdapter(mViewList);
       //給ViewPager設定介面卡
        mViewPager.setAdapter(mAdapter);

       //將TabLayout和ViewPager關聯起來
        mTabLayout.setupWithViewPager(mViewPager);
       //給Tabs設定介面卡
        mTabLayout.setTabsFromPagerAdapter(mAdapter);
    }

    //ViewPager介面卡
    class MyPagerAdapter extends PagerAdapter {
        private List<View> mViewList;

        public MyPagerAdapter(List<View> mViewList) {
            this.mViewList = mViewList;
        }

        @Override
        public int getCount() {
            return mViewList.size();//頁卡數
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;//官方推薦寫法
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            container.addView(mViewList.get(position));//新增頁卡
            return mViewList.get(position);
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView(mViewList.get(position));//刪除頁卡
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mTitleList.get(position);//頁卡標題
        }

    }

}
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• 4、實現效果如下

• 5、注意點

如果真的按上面一字不差走下來的話，會發現TabLayout在ViewPager滑動的時候會出現選單文字閃爍的現象。這個應該是版本的bug，想解決的話使用22.0裡沒有bug的版本（compile 'com.android.support:design:22.2.0'）或者升級到23.x