inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_pager_photo, container, false)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
val photoList = arguments?.getParcelableArrayList<PhotoItem>("PHOTO_LIST")
PagerPhotoListAdapter().apply {
viewPager2.adapter = this
submitList(photoList)
}
viewPager2.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
override fun onPageSelected(position: Int) {
super.onPageSelected(position)
photoTag.text = getString(R.string.photo_tag, position + 1, photoList?.size)
}
})
viewPager2.setCurrentItem(arguments?.getInt("PHOTO_POSITION") ?: 0, false)
saveButton.setOnClickListener {
//api29之后 又把写入权限放开 写入无需申请，读要申请权限
if (Build.VERSION.SDK_INT < 29 && ContextCompat.checkSelfPermission(
requireContext(),
Manifest.permission.WRITE_EXTERNAL_STORAGE
) != PackageManager.PERMISSION_GRANTED
) {
requestPermissions(
arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
REQUEST_WRITE_EXTERNAL_STORAGE
)
} else {
viewLifecycleOwner.lifecycleScope.launch {
savePhoto()
}
}
}
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
when (requestCode) {
REQUEST_WRITE_EXTERNAL_STORAGE -> {
if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
viewLifecycleOwner.lifecycleScope.launch {
savePhoto()
}
} else {
Toast.makeText(requireContext(), "存储失败", Toast.LENGTH_SHORT).show()
}
}
}
}
//suspend 挂起 可运行在子线程
private suspend fun savePhoto() {
withContext(Dispatchers.IO) {//运行在子线程
val holder =
(viewPager2[0] as RecyclerView).findViewHolderForAdapterPosition(viewPager2.currentItem)
as PagerPhotoViewHolder
val bitmap = holder.itemView.pagerPhoto.drawable.toBitmap()
val saveUri = requireContext().contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
ContentValues()
)?: kotlin.run {
Toast.makeText(requireContext(), "存储失败", Toast.LENGTH_SHORT).show()
return@withContext
}
requireContext().contentResolver.openOutputStream(saveUri).use {
if (bitmap.compress(Bitmap.CompressFormat.JPEG,90,it)) {
MainScope().launch {Toast.makeText(requireContext(), "存储成功", Toast.LENGTH_SHORT).show() }
} else {
MainScope().launch { Toast.makeText(requireContext(), "存储失败", Toast.LENGTH_SHORT).show() }
}
}
}
}
}
