1. 程式人生 > >使用TabLayout、ViewPager和Fragment實現頂部選單可滑動切換

使用TabLayout、ViewPager和Fragment實現頂部選單可滑動切換

效果圖如下


首先,要使用控制元件需要新增design library,在Android Studio中新增

compile 'com.android.support:design:23.4.0'

然後是佈局檔案

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.lg.tablayoutdemo.MainActivity">

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layou"
        android:layout_width="match_parent"
        app:tabIndicatorColor="@android:color/holo_blue_light"
        app:tabTextColor="@android:color/darker_gray"
        app:tabSelectedTextColor="@android:color/black"
        android:layout_height="wrap_content" />

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_below="@id/tab_layou"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>
其中TabLayout中tabIndicatorColor屬性為標籤底部下滑線顏色,tabTextColor為標籤未選中時字型顏色,tabSelectedTextColor為選中時字型顏色

自定一個FragmentPagerAdapter介面卡

public class MyViewPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> fragments;
    private String[] titles;

    public MyViewPagerAdapter(FragmentManager fm, String[] titles, List<Fragment> fragments) {
        super(fm);
        this.titles = titles;
        this.fragments = fragments;
    }

    @Override
    public Fragment getItem(int arg0) {
        return fragments.get(arg0);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }

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

Fragment程式碼我就不貼了,會在下面奉上原始碼地址
public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private MyViewPagerAdapter viewPagerAdapter;
    //TabLayout標籤
    private String[] titles=new String[]{"ANDROID","JAVA","C#","PHP"};
    private List<Fragment> fragments=new ArrayList<>();

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

    private void init(){
        tabLayout=(TabLayout)findViewById(R.id.tab_layou);
        viewPager=(ViewPager)findViewById(R.id.view_pager);
        //設定TabLayout標籤的顯示方式
        tabLayout.setTabMode(TabLayout.MODE_FIXED);
        //迴圈注入標籤
        for (String tab:titles){
          tabLayout.addTab(tabLayout.newTab().setText(tab));
        }
        //設定TabLayout點選事件
        tabLayout.setOnTabSelectedListener(this);

        fragments.add(new AndroidFragment());
        fragments.add(new JavaFragment());
        fragments.add(new CshapFragment());
        fragments.add(new PhpFragment());
        viewPagerAdapter=new MyViewPagerAdapter(getSupportFragmentManager(),titles,fragments);
        viewPager.setAdapter(viewPagerAdapter);
        tabLayout.setupWithViewPager(viewPager);
    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

以上是核心程式碼,至此功能就實現了,當然也可 以根據不同的需求進行改動