Java 查看寻呼机在旋转屏幕后保留旧片段
我有一个查看寻呼机,有4个片段。(im使用FragmentStatePagerAdapter) 每个片段都有一个“FrameLayout/container”,我在其中添加和替换了许多片段 一切正常,但当我更改屏幕方向时,行的第一个片段将恢复为实际片段。然后两者同时出现。 我正在放一张图片,上面有一个例子: [当我旋转屏幕时]Java 查看寻呼机在旋转屏幕后保留旧片段,java,android,android-fragments,android-viewpager,Java,Android,Android Fragments,Android Viewpager,我有一个查看寻呼机,有4个片段。(im使用FragmentStatePagerAdapter) 每个片段都有一个“FrameLayout/container”,我在其中添加和替换了许多片段 一切正常,但当我更改屏幕方向时,行的第一个片段将恢复为实际片段。然后两者同时出现。 我正在放一张图片,上面有一个例子: [当我旋转屏幕时] http://i.stack.imgur.com/kxaVn.png 我的主要活动代码 class MainActivity : AppCompatActivit
http://i.stack.imgur.com/kxaVn.png
我的主要活动代码
class MainActivity : AppCompatActivity() {
val numPages = 4
var pager: ViewPager? = null
private val TITLES = arrayOf("Feed", "Catalogo","Guia","Rendimento")
var menuImages:Array<ImageView>?=null
var menuTexts:Array<TextView>?=null
var fragments = arrayListOf<Fragment>()
private var fragmentCreated1: FeedContainerFragment? = null
private var fragmentCreated2: CatalogContainerFragment? = null
private var fragmentCreated3: GuideContainerFragment? = null
private var fragmentCreated4: TestContainerFragment? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_default)
fragments.add(FeedContainerFragment())
fragments.add(CatalogContainerFragment())
fragments.add(GuideContainerFragment())
fragments.add(TestContainerFragment())
menuImages= arrayOf(findViewById(R.id.icon_feed) as ImageView,
findViewById(R.id.icon_catalogue) as ImageView,
findViewById(R.id.icon_guide) as ImageView,
findViewById(R.id.icon_form) as ImageView)
menuTexts= arrayOf(findViewById(R.id.text_feed) as TextView,
findViewById(R.id.text_catalogue) as TextView,
findViewById(R.id.text_guide) as TextView,
findViewById(R.id.text_form) as TextView)
menuImages?.get(0)?.setColorFilter(ContextCompat.getColor(baseContext,R.color.colorAccent))
menuTexts?.get(0)?.setTextColor(ContextCompat.getColor(baseContext,R.color.colorAccent))
//view pager
pager = findViewById(R.id.pager) as ViewPager
val pagerAdapter = ScreenSlidePagerAdapter(supportFragmentManager)
pager?.adapter = pagerAdapter
pager?.offscreenPageLimit = 4
pager?.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
}
override fun onPageSelected(position: Int) {
pager?.adapter?.notifyDataSetChanged()
repaintMenuDefaultColor()
menuImages?.get(position)?.setColorFilter(ContextCompat.getColor(baseContext,R.color.colorAccent))
menuTexts?.get(position)?.setTextColor(ContextCompat.getColor(baseContext,R.color.colorAccent))
}
override fun onPageScrollStateChanged(state: Int) {
}
})
//Navigation Menus
MenuUtils.generateMaterialMenu(this)
MenuUtils.generateBottomMenu(this, this.pager!!)
}
private inner class ScreenSlidePagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {
override fun getCount(): Int {
return numPages
}
override fun getItem(position: Int): Fragment {
when(position) {
0->return FeedContainerFragment()
1->return CatalogContainerFragment()
2->return GuideContainerFragment()
3->return TestContainerFragment()
else->return FeedContainerFragment()
}
}
override fun getPageTitle(position: Int): CharSequence {
return TITLES[position]
}
override fun getItemPosition(obj: Any?): Int {
if (obj is Refreshable) {
return POSITION_NONE
}
return super.getItemPosition(obj)
}
override fun instantiateItem(container:ViewGroup, position:Int):Any {
val createdFragment = super.instantiateItem(container, position) as Fragment
when (position) {
0 -> fragmentCreated1 = createdFragment as FeedContainerFragment
1 -> fragmentCreated2 = createdFragment as CatalogContainerFragment
2 -> fragmentCreated3 = createdFragment as GuideContainerFragment
3 -> fragmentCreated4 = createdFragment as TestContainerFragment
}
return createdFragment
}
}
override fun onBackPressed() {
if (fragmentManager.backStackEntryCount > 0) {
fragmentManager.popBackStack()
} else {
super.onBackPressed()
}
}
fun repaintMenuDefaultColor(){
this.menuImages?.map {
it.setColorFilter(ContextCompat.getColor(baseContext,R.color.menu_icon))
}
this.menuTexts?.map {
it.setTextColor(ContextCompat.getColor(baseContext,R.color.menu_text))
}
}
旋转屏幕时,将重新创建活动和片段,使其从位置0开始
旋转屏幕时,将重新创建活动和片段,使其从位置0开始
片段是从位置0重新创建的,但不幸的是,实际片段被保留为“幽灵”。。。有没有办法强制对屏幕进行“干净”的重新绘制?片段是从位置0重新创建的,但不幸的是,实际片段被保留为“幽灵”。。。有没有办法强制对屏幕进行“干净”的重新喷漆?
if(savedInstanceState == null) {
activity
.supportFragmentManager
.beginTransaction()
.add(R.id.containerGuide, YourFragment())
.commit()
}