Viewpager Android中 [英] Viewpager in Android

问题描述

我怎么能创建 ViewPager 在两个方向。可能吗 ？如果有可能我怎么能实现它。

How could i create ViewPager in both direction. Is it possible ? If it possible how could i implement it.

我已经使用下面的code创建 viewpager 单方向：

I have created viewpager in single direction using the below code:

private void initialisePaging() {

        List<Fragment> fragments = new Vector<Fragment>();
        fragments.add(Fragment.instantiate(this, Fragment0.class.getName()));
        fragments.add(Fragment.instantiate(this, Fragment1.class.getName()));
        fragments.add(Fragment.instantiate(this, Fragment2.class.getName()));
        this.mPagerAdapter = new MyPagerAdapter(super.getSupportFragmentManager(), fragments);

        ViewPager pager = (ViewPager) super.findViewById(R.id.viewpager);
        pager.setAdapter(this.mPagerAdapter);
    }

任何人可以帮助我out..thanks！

Could anybody help me out..thanks!!

推荐答案

从我个人理解好了，你有片段要在其中用户启动列表在页 / 片段的中间，我已经打了，并测试了以下code，它是正常工作对我来说。

Okay from what I understand, you have a list of Fragments in which you want the user to start in the middle of the Pages/Fragments, I have played with and tested the following code and it is working properly for me.

如果你知道片段的数量和不动态改变片段那么这可以处理多少更简单地说，但我将关闭在OP提供的code。试试看：

If you know the amount of Fragments and aren't dynamically changing the Fragments then this can be handled much more simply, but I am going off your code provided in the OP. Try it out:

public class MainActivity extends FragmentActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // This is going to initialize our Fragment list
        mSectionsPagerAdapter.init();

        // Now we are going to determine the starting position
        int startPos = mSectionsPagerAdapter.getStartPosition();

        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // AFTER we set the adapter we will define our start position
        mViewPager.setCurrentItem(startPos);
    }
}

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现在让我们来看看我们的 FragmentPagerAdapter

我添加了一些方法，这个类中，的init（）方法 setCount（），和 getStartPosition（）。

I have added a couple methods to this class, the init() method, setCount(), and getStartPosition().

public class SectionsPagerAdapter extends FragmentPagerAdapter {
    private int _count = 2;
    private int _start = 0;

    List<Fragment> fragments;

    public SectionsPagerAdapter(FragmentManager fm) { 
        super(fm);
    }

    public void init() {
        fragments = new ArrayList<Fragment>();
        fragments.add(new MyFragmentOne());
        fragments.add(new MyFragmentTwo());
        fragments.add(new MyFragmentThree());
        fragments.add(new MyFragmentFour());
        fragments.add(new MyFragmentFive());
        setCount();
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        return super.instantiateItem(container, position);
    }

    @Override
    public Fragment getItem(int position) {
        return (fragments.size() >= position) ? fragments.get(position) : null;
    }

    // We have created this method to get the starting position
    // You might want to play around with this to make sure the returned
    // position fits what you want for odd numbered Fragment Pages
    public int getStartPosition() {
        _start = fragments.size() / 2;
        return Math.round(_start);
    }

    public void setCount() { this._count = fragments.size(); }

    @Override
    public int getCount() { return this._count; }

    // You will need to change this to get the appropriate title per page    
    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
        case 0:
            return getString(R.string.company_select).toUpperCase(Locale.ENGLISH);
        case 1:
            return getString(R.string.companies_pending).toUpperCase(Locale.ENGLISH);
        }
        return null;
    }
}

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的请注意：的你没有提供的您已经尝试了你，我已经写了code什么的例子。计算器是不是这个地方，将来当事情不工作给我们带来什么你已经尝试过，我们会尽力帮助确定出了什么问题。

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Please Note: You did not provide examples of what you have tried so I have written code for you. StackOverflow isn't a place for this, in the future when something doesn't work give us what you have tried and we will try to help determine what went wrong.

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