我正在使用 kotlin 构建一个 Android 应用程序，并使用 Glide 加载图像。
它适用于一个片段，但不适用于另一个片段，我不明白为什么我无法获得权限？！
图像存储在房间数据库内。
我已经检查了我的日志消息和图像-uri（内容），并且两个片段中的上下文是相同的，但一个获得了许可，而另一个则没有......
这是我收到的错误消息
2025-01-06 20:55:51.266 7954-7954 Glide com.example.travelfriends D Loading image from URI: content://media/external/images/media/1000000032
2025-01-06 20:55:51.266 7954-7954 Glide com.example.travelfriends D Context available: com.example.travelfriends.ui.MainActivity@9085568
2025-01-06 20:55:51.312 7954-7999 GlideExecutor com.example.travelfriends E Request threw uncaught throwable
java.lang.SecurityException: com.example.travelfriends has no access to content://media/external/images/media/1000000032
清单.xml
<uses-permission android:name="android.permission.READ_MEDIA_VISUAL_USER_SELECTED" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
glide 起作用的片段
package com.example.travelfriends.data
import android.net.Uri
import android.util.Log
import android.view.LayoutInflater
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.travelfriends.R
class BookAdapter(
private val books: List<Book>,
private val onBookClick: (Book) -> Unit
) : RecyclerView.Adapter<BookAdapter.BookViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BookViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_book, parent, false)
return BookViewHolder(view)
}
override fun onBindViewHolder(holder: BookViewHolder, position: Int) {
val book = books[position]
holder.bookTitle.text = book.name
holder.bookDescription.text = book.description
Log.d("Glide", "Context available: ${holder.itemView.context}")
Log.d("Glide", "Loading image from URI: ${book.image}")
// Verwende Glide, um das Bild zu laden
Glide.with(holder.itemView.context)
.load(Uri.parse(book.image))
.placeholder(R.drawable.ic_launcher_foreground)
.error(R.drawable.ic_launcher_foreground)
.into(holder.bookImage)
holder.itemView.setOnClickListener {
onBookClick(book)
}
}
override fun getItemCount(): Int {
return books.size
}
// ViewHolder für jedes Buch
class BookViewHolder(view: android.view.View) : RecyclerView.ViewHolder(view) {
val bookTitle: TextView = view.findViewById(R.id.tvRecViewBookTitle)
val bookDescription: TextView = view.findViewById(R.id.tvRecViewBookDescription)
val bookImage: ImageView = view.findViewById(R.id.ivRecViewBookImage)
}
}
Glide 不起作用的片段
package com.example.travelfriends.ui.fragments
import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.ImageView
import android.widget.TextView
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import com.bumptech.glide.Glide
import com.example.travelfriends.R
import com.example.travelfriends.data.AppViewModel
import com.example.travelfriends.data.Entry
class BookDisplayFragment : Fragment() {
private lateinit var ivBookImage: ImageView
private lateinit var tvBookTitle: TextView
private lateinit var appViewModel: AppViewModel
private var bookId: Int = -1
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_book_display, container, false)
ivBookImage = view.findViewById(R.id.bookImage)
tvBookTitle = view.findViewById(R.id.bookTitle)
val btnNextEntry: Button = view.findViewById(R.id.nextEntryButton)
appViewModel = ViewModelProvider(requireActivity())[AppViewModel::class.java]
// Abrufen der übergebenen Argumente
arguments?.let {
bookId = it.getInt("bookId", -1)
}
if (bookId != -1) {
appViewModel.getBookById(bookId)
observeBookData()
}
return view
}
private fun observeBookData() {
appViewModel.allBooks.observe(viewLifecycleOwner, Observer { books ->
if (books.isNotEmpty()) {
val book = books[0]
tvBookTitle.text = book.name
Log.d("Glide", "Loading image from URI: ${book.image}")
Log.d("Glide", "Context available: ${requireContext()}")
Glide.with(requireContext())
.load(book.image)
.placeholder(R.drawable.ic_launcher_foreground)
.error(R.drawable.ic_launcher_foreground)
.into(ivBookImage)
}
})
}
}
我试图理解为什么这个片段没有加载图像的权限，但另一个片段有...... 但我找不到答案，日志消息也没有帮助我。
我是一名学生，不是最有经验的程序员，所以请保持友善。
谢谢！
我认为问题出在生命周期状态或上下文中。
尝试将您的 Glide 放入
onResumeif (!book.image.isNullOrEmpty()) {
Glide.with(requireContext())
.load(book.image)
.placeholder(R.drawable.ic_launcher_foreground)
.error(R.drawable.ic_launcher_foreground)
.into(ivBookImage)
} else {
Log.d("Glide", "Invalid image URI: ${book.image}")
}
您也可以尝试在观察者中添加检查
private fun observeBookData() {
appViewModel.allBooks.observe(viewLifecycleOwner, Observer { books ->
if (books.isNotEmpty()) {
val book = books[0]
tvBookTitle.text = book.name
Log.d("Glide", "Loading image from URI: ${book.image}")
Log.d("Glide", "Context available: ${requireContext()}")
if (isAdded && !book.image.isNullOrEmpty()) {
Glide.with(requireContext())
.load(book.image)
.placeholder(R.drawable.ic_launcher_foreground)
.error(R.drawable.ic_launcher_foreground)
.into(ivBookImage)
} else {
Log.d("Glide", "Fragment not attached or invalid image URI")
}
}
})
}