Why do I need the WRITE_EXTERNAL_STORAGE permission with getExternalCacheDir() on Android Lollipop? -

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my app writes (and reads) cache files getexternalcachedir() location. before android lollipop (api 21) i've been using permission success:

<uses-permission android:name="android.permission.write_external_storage" android:maxsdkversion="18" />

the maxsdkversion there because permission shouldn't needed after api v18: http://developer.android.com/reference/android/manifest.permission.html#write_external_storage

but on android lollipop (5.0) i'm getting access permission (with log output show actual path used):

11-19 13:01:59.257    4462-4541/com.murrayc.galaxyzoo.app e/android-galaxyzoo﹕     createcachefile(): ioexception filename=/storage/emulated/0/android/data/com.murrayc.galaxyzoo.app/cache/52     java.io.ioexception: open failed: eacces (permission denied)             @ java.io.file.createnewfile(file.java:941)             @ com.murrayc.galaxyzoo.app.provider.itemscontentprovider.createcachefile(itemscontentprovider.java:528)

i see both in emulator , on nexus 4. has changed, or doing wrong along? want access own app's cache.

update: see on device (nexus 4 running standard android 5.1.1, has had fresh android reflash since first had problem). no longer see in emulator - of course system images have been updated several times.

we've seen same behaviour on api 21 (lollipop) on nexus 5:

java.io.filenotfoundexception: /storage/emulated/0/android/data/[package name]/cache/http/journal.tmp: open failed: eacces (permission denied)    @ libcore.io.iobridge.open(iobridge.java:456)    @ java.io.fileoutputstream.<init>(fileoutputstream.java:87)    @ java.io.fileoutputstream.<init>(fileoutputstream.java:72)    @ com.android.okhttp.internal.disklrucache.rebuildjournal(disklrucache.java:346)    @ com.android.okhttp.internal.disklrucache.open(disklrucache.java:239)    @ com.android.okhttp.httpresponsecache.<init>(httpresponsecache.java:140)    @ android.net.http.httpresponsecache.install(httpresponsecache.java:199) ...    @ android.app.instrumentation.callapplicationoncreate(instrumentation.java:1011)    @ android.app.activitythread.handlebindapplication(activitythread.java:4518)    @ android.app.activitythread.access$1500(activitythread.java:144)    @ android.app.activitythread$h.handlemessage(activitythread.java:1339)    @ android.os.handler.dispatchmessage(handler.java:102)    @ android.os.looper.loop(looper.java:135)    @ android.app.activitythread.main(activitythread.java:5221)    @ java.lang.reflect.method.invoke(method.java)    @ java.lang.reflect.method.invoke(method.java:372)    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694) caused by: android.system.errnoexception: open failed: eacces (permission denied)    @ libcore.io.posix.open(posix.java)    @ libcore.io.blockguardos.open(blockguardos.java:186)    @ libcore.io.iobridge.open(iobridge.java:442)    @ java.io.fileoutputstream.<init>(fileoutputstream.java:87)    @ java.io.fileoutputstream.<init>(fileoutputstream.java:72)    @ com.android.okhttp.internal.disklrucache.rebuildjournal(disklrucache.java:346)    @ com.android.okhttp.internal.disklrucache.open(disklrucache.java:239)    @ com.android.okhttp.httpresponsecache.<init>(httpresponsecache.java:140)    @ android.net.http.httpresponsecache.install(httpresponsecache.java:199) ...    @ android.app.instrumentation.callapplicationoncreate(instrumentation.java:1011)    @ android.app.activitythread.handlebindapplication(activitythread.java:4518)    @ android.app.activitythread.access$1500(activitythread.java:144)    @ android.app.activitythread$h.handlemessage(activitythread.java:1339)    @ android.os.handler.dispatchmessage(handler.java:102)    @ android.os.looper.loop(looper.java:135)    @ android.app.activitythread.main(activitythread.java:5221)    @ java.lang.reflect.method.invoke(method.java)    @ java.lang.reflect.method.invoke(method.java:372)    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694)

until google push android 5.0 aosp won't able work out if bug or deliberate (but undocumented) change, i've raised bug regardless: https://code.google.com/p/android/issues/detail?id=81357

adding write_external_storage permission prevents above exception being thrown, require end user permission upgrade existing apps. since our app doesn't use permission , don't want add it, we're falling using internal cache except kitkat devices.

as aside, found interesting background changes introduced in kitkat: http://www.doubleencore.com/2014/03/android-external-storage/


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