我正在使用 view-pager。因为我有三个选项卡:1. History ，2. Main ，3. Map 。

我有秒表进入主要 Activity 。当我按下开始然后在秒表的那个时间停止后添加到 sqlite 数据库中。在历史 Activity 中，我从数据库中获取秒表的值并将其存储到 ListView 中。它运行完美。

但现在我想在我从 Main > History 滑动时更新历史 Activity ，所以在按下停止按钮后，我将最后一个值放入历史 Activity 的 ListView 中。

我的问题是如何在滑动 viewpager 时更新 View ？

public class SwipeyTabsSampleActivity extends FragmentActivity {

private static final String [] TITLES = {
    "HISTORY", 
    "MAIN",
    "MAP"  

};

private SwipeyTabs mTabs;
private ViewPager mViewPager;
//Handler handler=new Handler();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_swipeytab);

    mViewPager = (ViewPager) findViewById(R.id.viewpager);
    mTabs = (SwipeyTabs) findViewById(R.id.swipeytabs);

    SwipeyTabsPagerAdapter adapter = new SwipeyTabsPagerAdapter(this,
            getSupportFragmentManager());
    mViewPager.setAdapter(adapter);
    mTabs.setAdapter(adapter);
    mViewPager.setOnPageChangeListener(mTabs);
    mViewPager.setCurrentItem(1); 
    mViewPager.setOffscreenPageLimit(3);


}

 private class SwipeyTabsPagerAdapter extends FragmentPagerAdapter implements
        SwipeyTabsAdapter, ViewPager.OnPageChangeListener {

    private final Context mContext;
    ViewPager viewpager;



    public SwipeyTabsPagerAdapter(Context context, FragmentManager fm, ViewPager mViewPager) {
        super(fm);

        this.mContext = context;
        viewpager = mViewPager;

        //viewpager.setAdapter(this);
        viewpager.setOnPageChangeListener(this);

    }

    @Override
    public Fragment getItem(int position) {

         Fragment f = new Fragment();

        switch (position) {
        case 0:
            f = History.newInstance(position);

            break;
        case 1:
            f = Main.newInstance(position);
            break;
        case 2:
            f = Map.newInstance(position);

            break;

        }
        return f;

    }

    @Override
    public int getCount() {
        return TITLES.length;
    }


     @Override
        public void destroyItem(ViewGroup container, int position, Object object) {

            ViewPager pager = (ViewPager) container;
            View view = (View) object;

            pager.removeView(view);
        }



    public TextView getTab(final int position, SwipeyTabs root) {
        TextView view = (TextView) LayoutInflater.from(mContext).inflate(
                R.layout.swipey_tab_indicator, root, false);
        view.setText(TITLES[position]);
        view.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mViewPager.setCurrentItem(position);

            }
        });

        return view;
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onPageSelected(int positiion) {
        // TODO Auto-generated method stub

    }

}

}

最佳答案

添加 ViewPager OnPageChangeListener:

mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            // your code here
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

关于android - 如何在滑动时更新 viewpager 的 View - android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13677153/