Android Kotlin:无法将 InputStream 保存为文件
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【中文标题】Android Kotlin:无法将 InputStream 保存为文件【英文标题】:Android Kotlin: unable to save InputStream as file 【发布时间】:2021-06-12 01:08:44 【问题描述】:我正在使用 Kotlin 构建一个 android 应用程序。在我的应用程序中,我试图将 InputStream 保存为文件。但它不起作用。
这是将 InputStream 保存为文件的函数
fun copyStreamToFile(inputStream: InputStream)
var outputFile = File("testing-again.png")
inputStream.use input ->
val outputStream = FileOutputStream(outputFile)
outputStream.use output ->
val buffer = ByteArray(4 * 1024) // buffer size
while (true)
val byteCount = input.read(buffer)
if (byteCount < 0) break
output.write(buffer, 0, byteCount)
output.flush()
它给了我以下错误
Process: com.forkthecoop.com22222, PID: 16949
java.lang.RuntimeException: Failure delivering result ResultInfowho=null, request=546, result=-1, data=Intent dat=content://com.google.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/31/ORIGINAL/NONE/image/jpeg/323542094 flg=0x1 clip=text/uri-list ... to activity com.forkthecoop.com22222/com.forkthecoop.com22222.SendOrdinaryMessageActivity: java.io.FileNotFoundException: testing-again.png: open failed: EROFS (Read-only file system)
at android.app.ActivityThread.deliverResults(ActivityThread.java:5015)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:5056)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.io.FileNotFoundException: testing-again.png: open failed: EROFS (Read-only file system)
at libcore.io.IoBridge.open(IoBridge.java:492)
at java.io.FileOutputStream.<init>(FileOutputStream.java:236)
at java.io.FileOutputStream.<init>(FileOutputStream.java:186)
at com.forkthecoop.com22222.PartialMediaUploadPreview.copyStreamToFile(PartialMediaUploadPreview.kt:171)
at com.forkthecoop.com22222.PartialMediaUploadPreview.handleOnActivityResult(PartialMediaUploadPreview.kt:146)
at com.forkthecoop.com22222.SendOrdinaryMessageActivity.onActivityResult(SendOrdinaryMessageActivity.kt:208)
at android.app.Activity.dispatchActivityResult(Activity.java:8310)
at android.app.ActivityThread.deliverResults(ActivityThread.java:5008)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:5056)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: android.system.ErrnoException: open failed: EROFS (Read-only file system)
at libcore.io.Linux.open(Native Method)
at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:254)
at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7542)
at libcore.io.IoBridge.open(IoBridge.java:478)
at java.io.FileOutputStream.<init>(FileOutputStream.java:236)
at java.io.FileOutputStream.<init>(FileOutputStream.java:186)
at com.forkthecoop.com22222.PartialMediaUploadPreview.copyStreamToFile(PartialMediaUploadPreview.kt:171)
at com.forkthecoop.com22222.PartialMediaUploadPreview.handleOnActivityResult(PartialMediaUploadPreview.kt:146)
at com.forkthecoop.com22222.SendOrdinaryMessageActivity.onActivityResult(SendOrdinaryMessageActivity.kt:208)
at android.app.Activity.dispatchActivityResult(Activity.java:8310)
at android.app.ActivityThread.deliverResults(ActivityThread.java:5008)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:5056)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
2021-03-14 15:56:54.505 518-2903/system_process E/WifiThreadRunner: WifiThreadRunner.call() timed out!
java.lang.Throwable: Stack trace:
at com.android.server.wifi.WifiThreadRunner.call(WifiThreadRunner.java:80)
at com.android.server.wifi.WifiServiceImpl.startScan(WifiServiceImpl.java:497)
at android.net.wifi.IWifiManager$Stub.onTransact(IWifiManager.java:718)
at android.os.Binder.execTransactInternal(Binder.java:1159)
at android.os.Binder.execTransact(Binder.java:1123)
我的应用程序对存储具有读取和写入权限。它只是不工作。我的代码有什么问题,我该如何解决?
【问题讨论】:
我不确定错误是什么。从那个错误来看,Caused by: android.system.ErrnoException: open failed: EROFS (Read-only file system)
和 Failure delivering result ResultInfowho=null, request=546, result=-1, data=Intent dat=content://com.google.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/31/ORIGINAL/NONE/image/jpeg/323542094 flg=0x1 clip=text/uri-list ... to activity com.forkthecoop.com22222/com.forkthecoop.com22222.SendOrdinaryMessageActivity: java.io.FileNotFoundException: testing-again.png: open failed: EROFS (Read-only file system)
所以,我认为您遇到了错误,因为您无权在该路径/目录上执行某些操作。
var outputFile = File("testing-again.png")
供应的完整路径。不仅仅是一个文件名。
这是因为您尝试将图像保存在此路径中:/testing-again.png
并且它是系统文件
【参考方案1】:
FileNotFoundException: testing-again.png: 打开失败: EROFS (只读文件系统)
您无法将文件保存在系统文件夹中,因此您必须指定路径并保存图像,例如我将图像保存在下面的 DCIM 文件夹中:
fun copyStreamToFile(inputStream: InputStream)
val storeDirectory = this.getExternalFilesDir(Environment.DIRECTORY_DCIM) // DCIM folder
val outputFile = File(storeDirectory, "testing-again.png")
inputStream.use input ->
val outputStream = FileOutputStream(outputFile)
outputStream.use output ->
val buffer = ByteArray(4 * 1024) // buffer size
while (true)
val byteCount = input.read(buffer)
if (byteCount < 0) break
output.write(buffer, 0, byteCount)
output.flush()
你会发现你的形象
在此路径中:/storage/emulated/0/Android/data/Your_Package_Name/files/DCIM
【讨论】:
当我按照您的代码更改路径时出现以下错误。 2021-03-14 17:19:14.300 18978-18978/com.forkthecoop.com22222 E/AndroidRuntime:致命异常:主进程:com.forkthecoop.com22222,PID:18978 java.lang。 RuntimeException: 传递结果失败 ResultInfowho=null, request=546, result=-1, data=Intent dat=content://com.google.android.apps.photos.contentprovider/-1/1/content:/ /media/external/images/media/31/ORIGINAL/NONE/image/jpeg/1216397895 flg=0x1 clip= 你在问题中提到的错误是一样的吗!?java.io.FileNotFoundException: testing-again.png: open failed: EROFS (Read-only file system)
?
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