Writing to SD Card always failing

问题

I am trying to move files from any location (including internal device storage) to SD Card,

For that I Have

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

in my manifest, and checked that it did work by checking if premissions are granted using :

Contex.checkCallingOrSelfPermission("android.permission.WRITE_EXTERNAL_STORAGE") and Contex.checkCallingOrSelfPermission("android.permission.READ_EXTERNAL_STORAGE")

and I have tried 3 diffrent ways to do that :

Files.move(original, newPath1), which comes with Guava com.google.common.io

this method :

public static void move(File src, File dst) throws IOException {
    FileInputStream inStream = new FileInputStream(src);
    FileOutputStream outStream = new FileOutputStream(dst);
    FileChannel inChannel = inStream.getChannel();
    FileChannel outChannel = outStream.getChannel();
    inChannel.transferTo(0, inChannel.size(), outChannel);
    inStream.close();
    outStream.close();
}

original.renameTo(newPath1);

I read alot of SO posts about this, and all solutions i tried did not work, I made sure the SD Card is mounted, and that i didnt have my device connected to PC while trying. I even tried 2 diffrent devices with SD Cards. Notice that i could access the image with BitmapFactory.decode() with the exact same path and i could load that image to imageview.

I am always getting EACCES (Permission denied). I dont know what else to do to solve this :(

11-13 11:11:54.358 19192-19372/xaday.ofek.ron.xaday W/System.err: java.io.FileNotFoundException: /storage/sdcard1/DCIM/thai2/IMG-20150702-WA0001.jpg: open failed: EACCES (Permission denied)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:465)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at com.google.common.io.Files$FileByteSink.openStream(Files.java:245)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at com.google.common.io.Files$FileByteSink.openStream(Files.java:233)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at com.google.common.io.ByteSource.copyTo(ByteSource.java:248)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at com.google.common.io.Files.copy(Files.java:458)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at com.google.common.io.Files.move(Files.java:673)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at xaday.ofek.ron.xaday.XaDayIntentService.handleActionMove(XaDayIntentService.java:128)
11-13 11:11:54.369 19192-19372/xaday.ofek.ron.xaday W/System.err:     at xaday.ofek.ron.xaday.XaDayIntentService.onHandleIntent(XaDayIntentService.java:84)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.os.Looper.loop(Looper.java:211)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.os.HandlerThread.run(HandlerThread.java:61)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.Posix.open(Native Method)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:451)
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err:   ... 12 more
11-13 11:11:54.370 19192-19372/xaday.ofek.ron.xaday W/System.err: java.io.FileNotFoundException: /storage/sdcard1/DCIM/thai2/IMG-20150702-WA0001.jpg: open failed: EACCES (Permission denied)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:465)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at java.io.FileOutputStream.<init>(FileOutputStream.java:72)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at xaday.ofek.ron.xaday.FileUtils.move(FileUtils.java:36)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at xaday.ofek.ron.xaday.XaDayIntentService.handleActionMove(XaDayIntentService.java:136)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at xaday.ofek.ron.xaday.XaDayIntentService.onHandleIntent(XaDayIntentService.java:84)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.os.Looper.loop(Looper.java:211)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at android.os.HandlerThread.run(HandlerThread.java:61)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.Posix.open(Native Method)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:451)
11-13 11:11:54.371 19192-19372/xaday.ofek.ron.xaday W/System.err:   ... 9 more

Just to make sure I was not locking the file in some way, I used another file manager app to execute the same file move - and it worked! why is it not working for me?!

anyone has an idea?

回答1:

On Android Kitkat (4.4), Google has changed how the developers can access to the removable storage (SD card). Quoting from source.android.com:

The WRITE_EXTERNAL_STORAGE permission must only grant write access to the primary external storage on a device. Apps must not be allowed to write to secondary external storage devices, except in their package-specific directories as allowed by synthesized permissions. Restricting writes in this way ensures the system can clean up files when applications are uninstalled.

For this reason, even with the WRITE_EXTERNAL_STORAGE permission, you can't write on the SD card on KitKat and higher versions.

On Android Lollipop (5.0), Google adds a new set of API that allows the developers to manage the file on the SD Card through the Storage Access Framework.

This StackOverflow answer explains in detail how to use the new APIs and the existing limitations:

How to use the new SD card access API presented for Android 5.0 (Lollipop)?

回答2:

Is the "uses-permission" tag outside of the "application" tag in the manifest.xml?

来源：https://stackoverflow.com/questions/33689457/writing-to-sd-card-always-failing

标签

android

android-sdcard