什么是引入外部存储写入功能的android版本

时间：2013-11-14 14:42:54

标签： android storage external android-4.2-jelly-bean

引入外部存储写入功能的android版本是什么？

写入外部存储器是否适用于前ICS设备？

对我来说 -

从外部SD卡读取数据工作正常。

但写入外部存储设备（SD卡），我的冰淇淋三明治设备失败了。 它适用于Jelly Bean设备。

logcat for error 

11-15 12:35:41.249: D/dalvikvm(3467): GC_CONCURRENT freed 299K, 8% free 6260K/6791K, paused 2ms+3ms
11-15 12:36:01.629: W/System.err(3467): java.io.FileNotFoundException: /mnt/extsd/test/S1 Shakti/Vouchers/Out Vouchers/TabletTotest.xml: open failed: EACCES (Permission denied)
11-15 12:36:01.639: W/System.err(3467):     at libcore.io.IoBridge.open(IoBridge.java:406)
11-15 12:36:01.639: W/System.err(3467):     at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
11-15 12:36:01.639: W/System.err(3467):     at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
11-15 12:36:01.649: W/System.err(3467):     at test.mobility.utils.TFileMgr.Write(TFileMgr.java:180)
11-15 12:36:01.649: W/System.err(3467):     at test.mobility.app.PVPDataSync.GenertateTransactionXML(PVPDataSync.java:982)
11-15 12:36:01.649: W/System.err(3467):     at test.mobility.app.PVPDataSync.GenerateData(PVPDataSync.java:482)
11-15 12:36:01.649: W/System.err(3467):     at test.mobility.app.MainActivity$1.onClick(MainActivity.java:83)
11-15 12:36:01.649: W/System.err(3467):     at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
11-15 12:36:01.649: W/System.err(3467):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 12:36:01.649: W/System.err(3467):     at android.os.Looper.loop(Looper.java:137)
11-15 12:36:01.649: W/System.err(3467):     at android.app.ActivityThread.main(ActivityThread.java:4424)
11-15 12:36:01.659: W/System.err(3467):     at java.lang.reflect.Method.invokeNative(Native Method)
11-15 12:36:01.659: W/System.err(3467):     at java.lang.reflect.Method.invoke(Method.java:511)
11-15 12:36:01.659: W/System.err(3467):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-15 12:36:01.659: W/System.err(3467):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-15 12:36:01.659: W/System.err(3467):     at dalvik.system.NativeStart.main(Native Method)
11-15 12:36:01.659: W/System.err(3467): Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
11-15 12:36:01.659: W/System.err(3467):     at libcore.io.Posix.open(Native Method)
11-15 12:36:01.669: W/System.err(3467):     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
11-15 12:36:01.669: W/System.err(3467):     at libcore.io.IoBridge.open(IoBridge.java:390)
11-15 12:36:01.669: W/System.err(3467):     ... 15 more
11-15 12:36:01.689: W/System.err(3467): java.io.FileNotFoundException: /mnt/extsd/test/S1 Shakti/Vouchers/Out Vouchers/TabletTotest.xml: open failed: EACCES (Permission denied)
11-15 12:36:01.689: W/System.err(3467):     at libcore.io.IoBridge.open(IoBridge.java:406)
11-15 12:36:01.689: W/System.err(3467):     at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
11-15 12:36:01.689: W/System.err(3467):     at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
11-15 12:36:01.689: W/System.err(3467):     at test.mobility.utils.TFileMgr.Write(TFileMgr.java:180)
11-15 12:36:01.689: W/System.err(3467):     at test.mobility.app.PVPDataSync.GenertateTransactionXML(PVPDataSync.java:982)
11-15 12:36:01.699: W/System.err(3467):     at test.mobility.app.PVPDataSync.GenerateData(PVPDataSync.java:482)
11-15 12:36:01.699: W/System.err(3467):     at test.mobility.app.MainActivity$1.onClick(MainActivity.java:83)
11-15 12:36:01.699: W/System.err(3467):     at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
11-15 12:36:01.699: W/System.err(3467):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 12:36:01.699: W/System.err(3467):     at android.os.Looper.loop(Looper.java:137)
11-15 12:36:01.699: W/System.err(3467):     at android.app.ActivityThread.main(ActivityThread.java:4424)
11-15 12:36:01.699: W/System.err(3467):     at java.lang.reflect.Method.invokeNative(Native Method)
11-15 12:36:01.699: W/System.err(3467):     at java.lang.reflect.Method.invoke(Method.java:511)
11-15 12:36:01.709: W/System.err(3467):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-15 12:36:01.709: W/System.err(3467):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-15 12:36:01.709: W/System.err(3467):     at dalvik.system.NativeStart.main(Native Method)
11-15 12:36:01.709: W/System.err(3467): Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
11-15 12:36:01.709: W/System.err(3467):     at libcore.io.Posix.open(Native Method)
11-15 12:36:01.709: W/System.err(3467):     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
11-15 12:36:01.709: W/System.err(3467):     at libcore.io.IoBridge.open(IoBridge.java:390)
11-15 12:36:01.709: W/System.err(3467):     ... 15 more
11-15 12:36:01.919: W/System.err(3467): java.io.FileNotFoundException: /mnt/extsd/test/S1 Shakti/Vouchers/Out Vouchers/TabletTotest.xml: open failed: EACCES (Permission denied)
11-15 12:36:01.919: W/System.err(3467):     at libcore.io.IoBridge.open(IoBridge.java:406)
11-15 12:36:01.919: W/System.err(3467):     at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
11-15 12:36:01.929: W/System.err(3467):     at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
11-15 12:36:01.929: W/System.err(3467):     at test.mobility.utils.TFileMgr.Write(TFileMgr.java:180)
11-15 12:36:01.929: W/System.err(3467):     at test.mobility.app.PVPDataSync.GenertateTransactionXML(PVPDataSync.java:982)
11-15 12:36:01.939: W/System.err(3467):     at test.mobility.app.PVPDataSync.GenerateData(PVPDataSync.java:482)
11-15 12:36:01.939: W/System.err(3467):     at test.mobility.app.MainActivity$1.onClick(MainActivity.java:83)
11-15 12:36:01.939: W/System.err(3467):     at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
11-15 12:36:01.939: W/System.err(3467):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 12:36:01.949: W/System.err(3467):     at android.os.Looper.loop(Looper.java:137)
11-15 12:36:01.949: W/System.err(3467):     at android.app.ActivityThread.main(ActivityThread.java:4424)
11-15 12:36:01.949: W/System.err(3467):     at java.lang.reflect.Method.invokeNative(Native Method)
11-15 12:36:01.949: W/System.err(3467):     at java.lang.reflect.Method.invoke(Method.java:511)
11-15 12:36:01.959: W/System.err(3467):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-15 12:36:01.959: W/System.err(3467):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-15 12:36:01.959: W/System.err(3467):     at dalvik.system.NativeStart.main(Native Method)
11-15 12:36:01.959: W/System.err(3467): Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
11-15 12:36:01.969: W/System.err(3467):     at libcore.io.Posix.open(Native Method)
11-15 12:36:01.969: W/System.err(3467):     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
11-15 12:36:01.969: W/System.err(3467):     at libcore.io.IoBridge.open(IoBridge.java:390)
11-15 12:36:01.979: W/System.err(3467):     ... 15 more

2 个答案:

答案 0 :(得分：0)

如果您还没有这样做，则需要通过将以下行添加到您的清单中，为您的应用提供写入SD卡的正确权限：

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

答案 1 :(得分：0)

您可以从API level 1写入SD卡。但是如果你想使用函数API level 8写入MUSIC，RINGTONES等公共目录，则需要Environment.getExternalStoragePublicDirectory()。
您如何使用File写入这些目录。

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