android.system.ErrnoException错误

Question

我正在尝试使用以下代码获取内部存储详细信息(用作内部存储器的存储).

public void getinternalstorage() {
        StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
        double bytesavalible = (double) stat.getBlockSizeLong() * (double) stat.getAvailableBlocksLong();
        final double gb = bytesavalible / (1024 * 1024 * 1024);
        double total = (double) stat.getBlockSizeLong() * stat.getBlockCountLong();
        final double totalgb = total / (1024 * 1024 * 1024);
        final double per = (100 - (gb / totalgb) * 100);
        update_inte((int) (per * 1), round(totalgb, 2), round((gb), 2));
        TextView text2written = (TextView) findViewById(R.id.inter);
        text2written.setText(String.valueOf(round((totalgb - gb), 2)) + " GB " + "/ " + String.valueOf(round(totalgb, 2)) + " GB");
    }

我也采取了所需的权限.

适用于Android 5.0及以下版本 -

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

对于Android 6.0及更高版本,我正在请求运行时权限.

但是我收到android.system.ErrnoException了大约10个用户的错误.全栈跟踪

Fatal Exception: java.lang.RuntimeException: Unable to resume activity {com.package.app.Main_Screen}: java.lang.IllegalArgumentException: Invalid path: /sdcard
       at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3121)
       at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3152)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1398)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5443)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by java.lang.IllegalArgumentException: Invalid path: /sdcard
       at android.os.StatFs.doStat(StatFs.java:46)
       at android.os.StatFs.(StatFs.java)
       at com.package.app.Main_Screen.getinternalstorage(Main_Screen.java:565)
       at com.package.app.Main_Screen.on_resume(Main_Screen.java:785)
       at com.package.app.Main_Screen.checkPermission(Main_Screen.java:1070)
       at com.package.app.Main_Screen.onResume(Main_Screen.java:779)
       at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1281)
       at android.app.Activity.performResume(Activity.java:6320)
       at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3110)
       at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3152)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1398)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5443)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by android.system.ErrnoException: statvfs failed: ENOENT (No such file or directory)
       at libcore.io.Posix.statvfs(Posix.java)
       at libcore.io.BlockGuardOs.statvfs(BlockGuardOs.java:298)
       at android.system.Os.statvfs(Os.java:500)
       at android.os.StatFs.doStat(StatFs.java:44)
       at android.os.StatFs.(StatFs.java)
       at com.package.app.Main_Screen.getinternalstorage(Main_Screen.java:565)
       at com.package.app.Main_Screen.on_resume(Main_Screen.java:785)
       at com.package.app.Main_Screen.checkPermission(Main_Screen.java:1070)
       at com.package.app.Main_Screen.onResume(Main_Screen.java:779)
       at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1281)
       at android.app.Activity.performResume(Activity.java:6320)
       at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3110)
       at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3152)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1398)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5443)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

我从5.0到7.0 Android版本收到此错误

Answer 1

I)从外部存储目录获取路径

Environment.getExternalStorageDirectory().getPath()

你会得到类似的东西：

 /storage/emulated/0
 /mnt/sdcard 
 /mnt/sdcard-ext 

但错误指出你只是刚开始/sdcard：

由 java.lang.IllegalArgumentException 引起：无效路径：/sdcard at android.os.StatFs.doStat(StatFs.java:46) at android.os.StatFs.(StatFs.java)

如果我们检查引发此错误的 SDK 方法：

private static StructStatVfs doStat(String path) {
    try {
        return Os.statvfs(path);
    } catch (ErrnoException e) {
        throw new IllegalArgumentException("Invalid path: " + path, e);
    }
}

函数statvfs()返回有关已安装文件系统的信息。path 是挂载的文件系统中任何文件的路径名。

因此，为避免此问题，您必须确保已安装 SD 卡！在这种情况下，很难在所有生产用户中确保这一点，该选项将是验证。

顺便说一句，我推荐使用getAbsolutePath()

Environment.getExternalStorageDirectory().getAbsolutePath();

代替

Environment.getExternalStorageDirectory().getPath();

要获取绝对路径，如果它是相对的，则是针对当前目录解析后的路径，从而产生“完全限定路径”。

II)显示的其他错误信息是：

由 android.system.ErrnoException 引起：statvfs failed: ENOENT (No such file or directory) at libcore.io.Posix.statvfs(Posix.java)

请记住，您的应用程序无法读取内部存储，请记住，您必须在设备 6.0+ 中手动要求WRITE_EXTERNAL_STORAGE（固有READ_EXTERNAL_STORAGE）权限

这将是以下原因：

ENOENT（没有那个文件或目录）

因为用户必须接受权限。