android - Android 上的异常 'open failed: EACCES (Permission denied)'

Question

我得到了

open failed: EACCES (Permission denied)

就行了OutputStream 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();
}

Answer 1

Google 在 Android Q 上有一项新功能:用于外部存储的过滤 View 。对此的快速修复是将此代码添加到 AndroidManifest.xml 文件中:

<manifest ... >
    <!-- This attribute is "false" by default on apps targeting Android Q. -->
    <application android:requestLegacyExternalStorage="true" ... >
     ...
    </application>
</manifest>

您可以在此处阅读更多信息:https://developer.android.com/training/data-storage/use-cases

编辑:我开始被否决，因为这个答案对于 Android 11 来说已经过时了。所以看到这个答案的人请转到上面的链接并阅读说明。