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結合Tab,ViewPager,Fragment實現簡單分頁滑動

在APP設計當中,使用ViewPager和Fragment來實現分頁滑動並不少見,該設計可以利用少量的空間來實現多內容的展示。效果圖如下:
這裡寫圖片描述
這裡寫圖片描述

以下是實現該功能的程式碼:

MainActivity

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;

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

        initView();
    }


    //tab點選事件
private ActionBar.TabListener mListener = new ActionBar.TabListener() { @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) { if (viewPager != null) { viewPager.setCurrentItem(tab.getPosition()); //設定當前顯示的fragment } } @Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) { } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) { } }; private void initView() { final ActionBar actionBar = getSupportActionBar(); ActionBar.Tab tab1 = actionBar.newTab(); //新建tab
ActionBar.Tab tab2 = actionBar.newTab(); tab1.setText("Tab1"); tab2.setText("Tab2"); tab1.setTabListener(mListener); //設定tab監聽事件,必須在actionBar.addTab語句之前,否則報錯 tab2.setTabListener(mListener); actionBar.addTab(tab1); actionBar.addTab(tab2); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);//設定模式 viewPager = (ViewPager) findViewById(R.id.viewPager); ArrayList<Fragment> fragments = new ArrayList<>(2); //新增兩個fragment或者更多 MyFragment fragment1 = new MyFragment(R.layout.fragment_tab1); MyFragment fragment2 = new MyFragment(R.layout.fragment_tab2); fragments.add(fragment1); fragments.add(fragment2); viewPager.setAdapter(new FragmentAdapter(getSupportFragmentManager(), fragments)); //設定介面卡 viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { //頁面滑動後tab跟著移動 @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); //設定當前tab選中的位置 } @Override public void onPageScrollStateChanged(int state) { } }); } }

MyFragement

public class MyFragment extends Fragment {
    private int resource;                //需要解析的佈局資源

    public MyFragment(int resource) {
        this.resource = resource;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(resource, container, false); //解析佈局,此處第三個引數應為false,否則會返回父檢視的佈局,導致OOM
        return v;
    }
}

FragmentAdapter

//介面卡,與ListView等所需介面卡的設定類似
public class FragmentAdapter extends FragmentPagerAdapter {
    private ArrayList<Fragment> fragments;

    public FragmentAdapter(FragmentManager fm, ArrayList<Fragment> fragments) {
        super(fm);
        this.fragments = fragments;
    }

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

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

至於XML的實現相對簡單:
activity_main.xml

<?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"
    tools:context="com.viewpager.MainActivity">

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

    </android.support.v4.view.ViewPager>
</RelativeLayout>