如何解决Android Kotlin:无法将 InputStream 保存为文件
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。
这是把InputStream保存为File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,byteCount)
}
output.flush()
}
}
}
它给了我以下错误
Process: com.forkthecoop.com22222,PID: 16949
java.lang.RuntimeException: Failure delivering result ResultInfo{who=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写权限。它只是不工作。我的代码有什么问题,我该如何解决?
解决方法
FileNotFoundException: testing-again.png: 打开失败: EROFS (只读文件系统)
您无法在系统文件夹中保存文件,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,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
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