如何将图像复制到SD卡上的现有目录？

我正在尝试使用以下代码复制图像文件：

InputStream fileInputStream = null;
OutputStream fileOutputStream = null;
String inPath = "/storage/emulated/0/Pictures/MyImage.jpg"; 
String outPath = "/storage/extSdCard/MyFolder/MyImage.jpg";
    try {
    verifyStoragePermissions(this);
    fileInputStream = new FileInputStream(new File(inPath));
    File outputFile = new File(outPath);
        if (!outputFile.exists()) {
            try {
                outPutFile.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    fileOutputStream = new FileOutputStream(outputFile);

    byte[] buffer = new byte[1024];
    int read;
    while ((read = fileInputStream.read(buffer)) != -1) {
        fileOutputStream.write(buffer, 0, read);
    }
    fileInputStream.close();
    fileInputStream = null;
    fileOutputStream.flush();
    fileOutputStream.close();
    fileOutputStream = null;

    } catch (Exception e) {
    Log.e("tag", e.getMessage());
    }

这是sdk>=23上验证存储权限的方法

// 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
        );
    }
}

结果是在到达之前发生的错误buffer line.

Unable to decode stream: java.io.FileNotFoundException: /storage/extSdCard/MyFolder/MyImage.jpg: open failed: ENOENT (No such file or directory)

I have MyFolder在我的设备上的 SD 卡和图库应用程序上，将图像复制到此目录没有任何问题。

注意：权限是在清单（在应用程序标记之前的正确位置）和内部活动（对于 skd >=23）中授予的。

EDITS:

1. 之前实现过创建文件的建议fileOutputStream（没有帮助）。

2. 降低了 targetSdkVersion 以克服与权限相关的任何可能的问题，但仍然没有成功。

targetSdkVersion 22

3. 创造File这样：

   File outFile = new File("/storage/extSdCard", "MyFolder/MyImage.jpg");

   也没有结果。

我正在 android 版本 22 上测试它。

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

您需要先创建文件，FileOutputStream如果文件不存在，将抛出该异常文件未找到异常 http://docs.oracle.com/javase/6/docs/api/java/io/FileNotFoundException.html

File outputFile = new File(outPath);
file.createNewFile();
fileOutputStream = new FileOutputStream(outputFile);