Android上的异常“打开失败:EACCES(权限被拒绝)”

我得到了

open failed: EACCES(权限被拒绝)

myOutput = new FileOutputStream(outFileName);

我检查了根目录，并尝试了android.permission.WRITE_EXTERNAL_STORAGE。

我该如何解决这个问题?

try {
    InputStream myInput;

    myInput = getAssets().open("XXX.db");

    // Path to the just created empty db
    String outFileName = "/data/data/XX/databases/"
            + "XXX.db";

    // Open the empty db as the output stream
    OutputStream myOutput = new FileOutputStream(outFileName);

    // Transfer bytes from the inputfile to the outputfile
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer)) > 0) {
        myOutput.write(buffer, 0, length);
    }

    // Close the streams
    myOutput.flush();
    myOutput.close();
    myInput.close();
    buffer = null;
    outFileName = null;
}
catch (IOException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
}

当前回答

当您的应用程序属于系统应用程序时，它不能访问SD卡。

2012-11-21 07:41:44

其他回答

我的问题是“TargetApi(23)”，这是需要的，如果你的minSdkVersion是低于23。

因此，我已请求以下代码片段的权限

protected boolean shouldAskPermissions() {
    return (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP_MR1);
}

@TargetApi(23)
protected void askPermissions() {
    String[] permissions = {
            "android.permission.READ_EXTERNAL_STORAGE",
            "android.permission.WRITE_EXTERNAL_STORAGE"
    };
    int requestCode = 200;
    requestPermissions(permissions, requestCode);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
// ...
    if (shouldAskPermissions()) {
        askPermissions();
    }
}

2016-10-27 06:09:59

Environment.getExternalStoragePublicDirectory();

当从Android 29开始使用这个已弃用的方法时，你会收到相同的错误:

java.io.FileNotFoundException: open failed: EACCES (Permission denied)

分辨率:

getExternalStoragePublicDirectory在Android Q中已弃用

2019-07-19 11:58:35

在我的例子中，我使用的是一个文件选择器库，它返回到外部存储的路径，但它从/root/开始。即使在运行时授予WRITE_EXTERNAL_STORAGE权限，我仍然得到错误EACCES(权限被拒绝)。因此，使用Environment.getExternalStorageDirectory()来获取外部存储的正确路径。

例子: 无法写入:/root/storage/emulated/0/newfile.txt 可以写:/storage/emulated/0/newfile.txt

boolean externalStorageWritable = isExternalStorageWritable();
File file = new File(filePath);
boolean canWrite = file.canWrite();
boolean isFile = file.isFile();
long usableSpace = file.getUsableSpace();

Log.d(TAG, "externalStorageWritable: " + externalStorageWritable);
Log.d(TAG, "filePath: " + filePath);
Log.d(TAG, "canWrite: " + canWrite);
Log.d(TAG, "isFile: " + isFile);
Log.d(TAG, "usableSpace: " + usableSpace);

/* Checks if external storage is available for read and write */
public boolean isExternalStorageWritable() {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {
        return true;
    }
    return false;
}

输出1:

externalStorageWritable: true
filePath: /root/storage/emulated/0/newfile.txt
isFile: false
usableSpace: 0

输出2:

externalStorageWritable: true
filePath: /storage/emulated/0/newfile.txt
isFile: true
usableSpace: 1331007488

2017-08-28 19:51:48

我也有同样的经历。我发现，如果你去设置->应用程序管理器->你的应用程序->权限->启用存储，它解决了这个问题。

2018-02-08 06:26:46

修改/system/etc/permission/platform.xml中的权限属性和小组需要提到如下。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">
    <group android:gid="sdcard_rw" />
    <group android:gid="media_rw" />    
</uses-permission>

2013-12-04 15:47:27

Android上的异常“打开失败:EACCES(权限被拒绝)”

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