Android 中ViewPager重排序与更新实例详解

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最近的项目中有栏目订阅功能，在更改栏目顺序以后需要更新ViewPager。类似于网易新闻的频道管理。

在重新排序之后调用了PagerAdapter的notifyDataSetChanged方法，发现ViewPager并没有更新，于是我开始跟踪源码，在调用PagerAdapter的notifyDataSetChanged方法后，会触发Viewpager的dataSetChanged方法。

 void dataSetChanged() {
    // This method only gets called if our observer is attached, so mAdapter is non-null.

    final int adapterCount = mAdapter.getCount();
    mExpectedAdapterCount = adapterCount;
    boolean needPopulate = mItems.size() < mOffscreenPageLimit * 2 + 1 &&
        mItems.size() < adapterCount;
    int newCurrItem = mCurItem;

    boolean isUpdating = false;
    for (int i = 0; i < mItems.size(); i++) {
      final ItemInfo ii = mItems.get(i);
      final int newPos = mAdapter.getItemPosition(ii.object);

      if (newPos == PagerAdapter.POSITION_UNCHANGED) {
        continue;
      }

      if (newPos == PagerAdapter.POSITION_NONE) {
        mItems.remove(i);
        i--;

        if (!isUpdating) {
          mAdapter.startUpdate(this);
          isUpdating = true;
        }

        mAdapter.destroyItem(this, ii.position, ii.object);
        needPopulate = true;

        if (mCurItem == ii.position) {
          // Keep the current item in the valid range
          newCurrItem = Math.max(0, Math.min(mCurItem, adapterCount - 1));
          needPopulate = true;
        }
        continue;
      }

      if (ii.position != newPos) {
        if (ii.position == mCurItem) {
          // Our current item changed position. Follow it.
          newCurrItem = newPos;
        }

        ii.position = newPos;
        needPopulate = true;
      }
    }

    if (isUpdating) {
      mAdapter.finishUpdate(this);
    }

    Collections.sort(mItems, COMPARATOR);

    if (needPopulate) {
      // Reset our known page widths; populate will recompute them.
      final int childCount = getChildCount();
      for (int i = 0; i < childCount; i++) {
        final View child = getChildAt(i);
        final LayoutParams lp = (LayoutParams) child.getLayoutParams();
        if (!lp.isDecor) {
          lp.widthFactor = 0.f;
        }
      }

      setCurrentItemInternal(newCurrItem, false, true);
      requestLayout();
    }
  }

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