旧项目内存泄漏修复

有个旧项目内存泄漏问题，用的是viewpager，页面多次跳转后，内存明显一直在增长，最后发现是viewpager中对fragment的引用导致

所以需要对adapter进行改造，不直接引用fragment，而是fragment的class

 

open class FragmentPagerAdapter : FragmentStatePagerAdapter {
    var fragmentClass: List<Class<*>> = emptyList()
    var titles: List<String>? = null

    constructor(fm: FragmentManager, list: List<BaseFragment>, titles: List<String>?) : super(fm) {
        this.titles = titles
        this.fragmentClass = list.map {
            it.javaClass
        }
    }

    constructor(fm: FragmentManager) : super(fm)


    override fun getItem(position: Int): Fragment {
        childCount = position

        return (fragmentClass.get(position).newInstance() as BaseFragment) //反射加载Fragment

    }

    override fun getCount(): Int {
        return fragmentClass.size
    }

    override fun getPageTitle(position: Int): CharSequence? {
        return titles!![position]
    }

    var childCount: Int = 0
    override fun getItemPosition(`object`: Any): Int {

        return super.getItemPosition(`object`)
    }

    override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
        super.destroyItem(container, position, `object`)
    }
}

改造之后，页面跳转内存就平稳了