Acessar um arquivo do Gerenciador de Arquivos no Android 4.4 mostra Exceção

Question

Estou desenvolvendo um aplicativo Android, neste aplicativo estou acessando um arquivo do padrão do Android file manger.Se eu executar este aplicativo em versões inferiores (exceto Android 4.4), posso acessar o arquivo em meu aplicativo, mas se eu executar meu aplicativo com android 4.4 kitkat OS Não consegui acessar um arquivo do gerenciador de arquivos, ele mostrou alguns Exceptions.aqui anexei minha saída do LogCat.

LogCat

06-03 15:59:34.127 W/System.err(14882): java.io.FileNotFoundException: /system/etc/vold.fstab: open failed: ENOENT (No such file or directory)
06-03 15:59:34.127 W/System.err(14882):     at libcore.io.IoBridge.open(IoBridge.java:409)
06-03 15:59:34.127 W/System.err(14882):     at java.io.FileInputStream.<init>(FileInputStream.java:78)
06-03 15:59:34.127 W/System.err(14882):     at java.util.Scanner.<init>(Scanner.java:158)
06-03 15:59:34.127 W/System.err(14882):     at java.util.Scanner.<init>(Scanner.java:138)
06-03 15:59:34.127 W/System.err(14882):     at com.ipaulpro.afilechooser.StorageOptions.readVoldFile(StorageOptions.java:81)
06-03 15:59:34.127 W/System.err(14882):     at com.ipaulpro.afilechooser.StorageOptions.determineStorageOptions(StorageOptions.java:21)
06-03 15:59:34.127 W/System.err(14882):     at com.ipaulpro.afilechooser.FileChooserActivity.onCreate(FileChooserActivity.java:348)
06-03 15:59:34.127 W/System.err(14882):     at com.wepanow.MyFileChooserActivity.onCreate(MyFileChooserActivity.java:24)
06-03 15:59:34.127 W/System.err(14882):     at android.app.Activity.performCreate(Activity.java:5231)
06-03 15:59:34.127 W/System.err(14882):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-03 15:59:34.127 W/System.err(14882):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
06-03 15:59:34.127 W/System.err(14882):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-03 15:59:34.127 W/System.err(14882):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-03 15:59:34.127 W/System.err(14882):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-03 15:59:34.127 W/System.err(14882):     at android.os.Handler.dispatchMessage(Handler.java:102)
06-03 15:59:34.127 W/System.err(14882):     at android.os.Looper.loop(Looper.java:136)
06-03 15:59:34.127 W/System.err(14882):     at android.app.ActivityThread.main(ActivityThread.java:5017)
06-03 15:59:34.127 W/System.err(14882):     at java.lang.reflect.Method.invokeNative(Native Method)
06-03 15:59:34.127 W/System.err(14882):     at java.lang.reflect.Method.invoke(Method.java:515)
06-03 15:59:34.127 W/System.err(14882):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-03 15:59:34.127 W/System.err(14882):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-03 15:59:34.127 W/System.err(14882):     at dalvik.system.NativeStart.main(Native Method)
06-03 15:59:34.127 W/System.err(14882): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
06-03 15:59:34.127 W/System.err(14882):     at libcore.io.Posix.open(Native Method)
06-03 15:59:34.127 W/System.err(14882):     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
06-03 15:59:34.127 W/System.err(14882):     at libcore.io.IoBridge.open(IoBridge.java:393)
06-03 15:59:34.127 W/System.err(14882):     ... 21 more



06-03 15:59:39.012 E/wepa    (14882): File select error
06-03 15:59:39.012 E/wepa    (14882): java.lang.NullPointerException
06-03 15:59:39.012 E/wepa    (14882):   at java.io.File.fixSlashes(File.java:185)
06-03 15:59:39.012 E/wepa    (14882):   at java.io.File.<init>(File.java:134)
06-03 15:59:39.012 E/wepa    (14882):   at com.ipaulpro.afilechooser.FileChooserActivity.onActivityResult(FileChooserActivity.java:453)
06-03 15:59:39.012 E/wepa    (14882):   at android.app.Activity.dispatchActivityResult(Activity.java:5423)
06-03 15:59:39.012 E/wepa    (14882):   at android.app.ActivityThread.deliverResults(ActivityThread.java:3361)
06-03 15:59:39.012 E/wepa    (14882):   at android.app.ActivityThread.handleSendResult(ActivityThread.java:3408)
06-03 15:59:39.012 E/wepa    (14882):   at android.app.ActivityThread.access$1300(ActivityThread.java:135)
06-03 15:59:39.012 E/wepa    (14882):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
06-03 15:59:39.012 E/wepa    (14882):   at android.os.Handler.dispatchMessage(Handler.java:102)
06-03 15:59:39.012 E/wepa    (14882):   at android.os.Looper.loop(Looper.java:136)
06-03 15:59:39.012 E/wepa    (14882):   at android.app.ActivityThread.main(ActivityThread.java:5017)
06-03 15:59:39.012 E/wepa    (14882):   at java.lang.reflect.Method.invokeNative(Native Method)
06-03 15:59:39.012 E/wepa    (14882):   at java.lang.reflect.Method.invoke(Method.java:515)
06-03 15:59:39.012 E/wepa    (14882):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-03 15:59:39.012 E/wepa    (14882):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-03 15:59:39.012 E/wepa    (14882):   at dalvik.system.NativeStart.main(Native Method)
06-03 15:59:39.012 D/ChooserActivity(14882): Intent Action: null
06-03 15:59:39.012 I/wepa    (14882): FileChooser > onResume
06-03 15:59:39.012 I/wepa    (14882): FC (onResume)has Extra:false
06-03 15:59:39.012 I/wepa    (14882): FC (onResume)has Extra:false
06-03 15:59:39.022 V/PhoneStatusBar(660): setLightsOn(true)
06-03 15:59:43.826 D/wepa    (14882): File selections canceled

Answer 1

Estou acessando um arquivo do gerenciador de arquivos padrão do Android

O Android não possui um gerenciador de arquivos.

se eu executei meu aplicativo com o sistema operacional Android 4.4 kitkat, não consegui acessar um arquivo do gerenciador de arquivos, ele mostrou algumas exceções

Você não tem acesso de leitura a /system/etc/vold.fstab neste dispositivo, aparentemente.Não há exigência de que este arquivo possa ser lido em todos os dispositivos por aplicativos SDK comuns, e o Android 4.4.x tem aumentado progressivamente a segurança no acesso ao sistema de arquivos.