Question

解决了（我只需要从FragmentPagerAdapter更改为FragmentStatePagerAdapter因为最后一个保存了屏幕中不可见的片段的状态。所以当你需要很多片段时，它们是不可见，内存，信息可能泄漏，活动可能被破坏。这就是GridView发生的事情（下面的问题）添加FragmentStatePagerAdapter会在片段再次可见时保存片段的状态。

我正在开发一个在线购物应用程序。由于我必须展示大量产品，我使用了大量的分类。我使用的主要功能之一是带有PageAdapter的ViewPager。在每个片段中，它应该是不同的布局。在其中一个片段中，我使用了GridView。问题是，当我在页面之间切换时，我返回到GridView大小的第一页，内部元素的数量不断增加。例如，如果我在开始时有12个元素，在我切换页面然后再次返回后它会变为24,36等。

以下是我用于此的代码： EbuyHomeScreen.class

 public class EbuyHomeScreen extends FragmentActivity {

        @SuppressLint("InlinedApi") protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            setContentView(R.layout.ebuy_home_screen);

            /** Getting a reference to the ViewPager defined the layout file */        
            ViewPager pager = (ViewPager) findViewById(R.id.pager);

            /** Getting fragment manager */
            FragmentManager fm = getSupportFragmentManager();

            /** Instantiating FragmentPagerAdapter */
            EbuyFragmentPagerAdapter pagerAdapter = new EbuyFragmentPagerAdapter(fm);

            /** Setting the pagerAdapter to the pager object */
            pager.setAdapter(pagerAdapter);
        }

EbuyFragmentPagerAdapter

 public class EbuyFragmentPagerAdapter extends FragmentStatePagerAdapter{

        final int PAGE_COUNT = 3;

        /** Constructor of the class */
        public EbuyFragmentPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        /** This method will be invoked when a page is requested to create */
        @Override
        public Fragment getItem(int position) {
            switch (position) {

            case 0:
                EbuyFragmentLatest myFragmentLatest = new EbuyFragmentLatest();
                return myFragmentLatest;

            case 1:

                EbuyFragmentSold myFragmentSold = new EbuyFragmentSold();
                return myFragmentSold;

            case 2:
                EbuyFragmentSponsored myFragmentSponsored = new EbuyFragmentSponsored();
                return myFragmentSponsored;

            default:

                EbuyFragmentLatest myFragmentLatestDefault = new EbuyFragmentLatest();
                return myFragmentLatestDefault;
            }

        }

        /** Returns the number of pages */
        @Override
        public int getCount() {
            return PAGE_COUNT;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
            /** code for returning the title*/      }
        }

    }

EbuyFragmentLatest

    public class EbuyFragmentLatest extends Fragment {

        final ArrayList<EbuyItem> ebuy_data = new ArrayList<EbuyItem>();
        private EbuyItemAdapter customAdapter;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.ebuy_home_fragment_latest,
                    container, false);
            JazzyGridView  mGrid = (JazzyGridView)v.findViewById(R.id.ebuy_list);
            mGrid.setTransitionEffect(JazzyHelper.TILT);

            ebuy_data.add(new EbuyItem("http://www.ebuy.al/Images/dsc/8884_400_300.jpg","Fustan Glamour","2,500L [17.9 €]"));
            /*
                ** filing with data continues */

            customAdapter = new EbuyItemAdapter(
                    container.getContext(), ebuy_data);
                    mGrid.setAdapter(customAdapter);
            return v;
        }
    }

EbuyItemAdapter

public class EbuyItemAdapter extends BaseAdapter {

    private ArrayList<EbuyItem> ebuy_data;

    private LayoutInflater layoutInflater;

    public EbuyItemAdapter(Context context, ArrayList<EbuyItem> ebuy_data) {
        this.ebuy_data = ebuy_data;
        layoutInflater = LayoutInflater.from(context);
    }

    public int getCount() {
        return ebuy_data.size();
    }

    public Object getItem(int position) {
        return ebuy_data.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    @SuppressLint({ "DefaultLocale", "InflateParams" })
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = layoutInflater.inflate(R.layout.ebuy_item, null);
            holder = new ViewHolder();
            holder.name = (TextView) convertView.findViewById(R.id.name);
            holder.price = (TextView) convertView.findViewById(R.id.price);
            holder.image = (ImageView) convertView
                    .findViewById(R.id.ebuy_image);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.name.setText(((EbuyItem) ebuy_data.get(position)).getName());
        holder.price.setText(((EbuyItem) ebuy_data.get(position)).getPrice());
        UrlImageViewHelper.setUrlDrawable(holder.image,
                ((EbuyItem) ebuy_data.get(position)).getImageUrl(),
                R.drawable.loading);

        return convertView;
    }

    static class ViewHolder {

        TextView name;
        TextView price;
        ImageView image;
    }

}

Answer 1

解决了（我只需要从FragmentPagerAdapter更改为FragmentStatePagerAdapter因为最后一个保存了屏幕中不可见的片段的状态。所以当你需要很多片段时，它们是不可见，内存，信息可能泄漏，活动可能会被破坏。这就是GridView发生的事情。添加FragmentStatePagerAdapter会在片段再次可见时保存片段的状态。

所以只需改变这一行：

public class EbuyFragmentPagerAdapter extends FragmentPagerAdapter

到

public class EbuyFragmentPagerAdapter extends FragmentStatePagerAdapter

当PagerAdapter（Android）时，GridView的大小不断增长

1 个答案: