如何将资产复制到内部目录？

Question

我尝试将图片直接从资源复制到应用程序包。这不起作用，抛出异常。如何将图像复制到内部目录？

我尝试了输出路径

Environment.getDataDirectory().toString()+"/facerecogOCV"

和

"data/data/org.opencv.javacv.facerecognition/files/facerecogOCV"

我使用了以下代码：

    AssetManager assetManager = getAssets();
    String[] files = null;

    try {
        files = assetManager.list("Files");
    } catch (IOException e) {
        Log.e("tag", "Failed to get asset file list.", e);
    }
    for(String filename : files) {
        InputStream in = null;
        OutputStream out = null;
        System.out.println("Files=>" + filename);

        try {
            in = assetManager.open("Files=>"+filename);
            out =  new FileOutputStream(Environment.getDataDirectory().toString()+"files/facerecogOCV");

            copyFile(in,out);
            in.close();
            in=null;
            out.flush();
            out.close();
            out=null;

        } catch(IOException e) {
            Log.e("tag", "Failed to copy asset file: " + filename, e);
        }
    }
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while((read = in.read(buffer)) != -1){
        out.write(buffer, 0, read);
    }
}

该异常具有以下堆栈跟踪：

Failed to copy asset file: image-26.jpg
java.io.FileNotFoundException: Files=>image-26.jpg
  at android.content.res.AssetManager.openAsset(Native Method)
  at android.content.res.AssetManager.open(AssetManager.java:331)
  at android.content.res.AssetManager.open(AssetManager.java:305)
  at org.opencv.javacv.facerecognition.MainMenu.copyAssets(MainMenu.java:121)
  at org.opencv.javacv.facerecognition.MainMenu.onCreate(MainMenu.java:38)
  at android.app.Activity.performCreate(Activity.java:5990)
  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420)
  at android.app.ActivityThread.access$900(ActivityThread.java:154)
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
  at android.os.Handler.dispatchMessage(Handler.java:102)
  at android.os.Looper.loop(Looper.java:135)
  at android.app.ActivityThread.main(ActivityThread.java:5294)
  at java.lang.reflect.Method.invoke(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:372)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
  at