android API 23以后对SD卡上的文件进行读写操作需要额外判断

本文链接：https://blog.youkuaiyun.com/liuhongbin2011net/article/details/78812703

本文介绍了在Android 2.3中正确配置SD卡权限的方法，包括在AndroidManifest.xml中声明必要的权限，以及运行时请求存储权限的具体实现。

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参考：https://stackoverflow.com/questions/8854359/exception-open-failed-eacces-permission-denied-on-android/13569364#13569364

android-23对SD卡上操作不仅要在AndroidManifset.xml文件进行下面的权限设置：

<!-- SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 向SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

还要对SD卡进行判断，

// Storage Permissions
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
        Manifest.permission.READ_EXTERNAL_STORAGE,
        Manifest.permission.WRITE_EXTERNAL_STORAGE
};

/**
 * Checks if the app has permission to write to device storage
 *
 * If the app does not has permission then the user will be prompted to grant permissions
 *
 * @param activity
 */
public static void verifyStoragePermissions(Activity activity) {
    // Check if we have write permission
    int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permission != PackageManager.PERMISSION_GRANTED) {
        // We don't have permission so prompt the user
        ActivityCompat.requestPermissions(
                activity,
                PERMISSIONS_STORAGE,
                REQUEST_EXTERNAL_STORAGE
        );
    }
}