• 测试


    标题一

    标题二

    标题三

    标题四

    标题五

    正文

    代码

    public abstract class FragmentPagerAdapter extends PagerAdapter {
        private static final String TAG = "FragmentPagerAdapter";
        private static final boolean DEBUG = false;
    
        private final FragmentManager mFragmentManager;
        private FragmentTransaction mCurTransaction = null;
        private Fragment mCurrentPrimaryItem = null;
    
        public FragmentPagerAdapter(FragmentManager fm) {
            mFragmentManager = fm;
        }
    
        /**
         * Return the Fragment associated with a specified position.
         */
        public abstract Fragment getItem(int position);
    
        @Override
        public void startUpdate(ViewGroup container) {
        }
    
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            if (mCurTransaction == null) {
                mCurTransaction = mFragmentManager.beginTransaction();
            }
    
            final long itemId = getItemId(position);
    
            // Do we already have this fragment?
            String name = makeFragmentName(container.getId(), itemId);
            Fragment fragment = mFragmentManager.findFragmentByTag(name);
            if (fragment != null) {
                if (DEBUG) Log.v(TAG, "Attaching item #" + itemId + ": f=" + fragment);
                mCurTransaction.attach(fragment);
            } else {
                fragment = getItem(position);
                if (DEBUG) Log.v(TAG, "Adding item #" + itemId + ": f=" + fragment);
                mCurTransaction.add(container.getId(), fragment,
                        makeFragmentName(container.getId(), itemId));
            }
            if (fragment != mCurrentPrimaryItem) {
                fragment.setMenuVisibility(false);
                fragment.setUserVisibleHint(false);
            }
    
            return fragment;
        }
    
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            if (mCurTransaction == null) {
                mCurTransaction = mFragmentManager.beginTransaction();
            }
            if (DEBUG) Log.v(TAG, "Detaching item #" + getItemId(position) + ": f=" + object
                    + " v=" + ((Fragment)object).getView());
            mCurTransaction.detach((Fragment)object);
        }
    
        @Override
        public void setPrimaryItem(ViewGroup container, int position, Object object) {
            Fragment fragment = (Fragment)object;
            if (fragment != mCurrentPrimaryItem) {
                if (mCurrentPrimaryItem != null) {
                    mCurrentPrimaryItem.setMenuVisibility(false);
                    mCurrentPrimaryItem.setUserVisibleHint(false);
                }
                if (fragment != null) {
                    fragment.setMenuVisibility(true);
                    fragment.setUserVisibleHint(true);
                }
                mCurrentPrimaryItem = fragment;
            }
        }
    
        @Override
        public void finishUpdate(ViewGroup container) {
            if (mCurTransaction != null) {
                mCurTransaction.commitAllowingStateLoss();
                mCurTransaction = null;
                mFragmentManager.executePendingTransactions();
            }
        }
    
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return ((Fragment)object).getView() == view;
        }
    
        @Override
        public Parcelable saveState() {
            return null;
        }
    
        @Override
        public void restoreState(Parcelable state, ClassLoader loader) {
        }
    
        /**
         * Return a unique identifier for the item at the given position.
         *
         * <p>The default implementation returns the given position.
         * Subclasses should override this method if the positions of items can change.</p>
         *
         * @param position Position within this adapter
         * @return Unique identifier for the item at position
         */
        public long getItemId(int position) {
            return position;
        }
    
        private static String makeFragmentName(int viewId, long id) {
            return "android:switcher:" + viewId + ":" + id;
        }
    }
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  • 原文地址:https://www.cnblogs.com/ShawnWithSmallEyes/p/test-3.html
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