how to copy folder in asset to internal storage?

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Java

Mobile

Apache

Android

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hi i wanna take some pictures with my app the after user install that in first run those files copy to internal storage but i don't know where should i put my pictures i try to put it into Asset folder but now i can't copy that into internal storage.
i try this code:

class bgTask extends AsyncTask
        {

            @Override
            protected Object doInBackground(Object[] params) {
                String src="file:///android_asset/images";
                String dst=Environment.getExternalStorageDirectory().toString() +"/123/";
                File s=new File(src);
                File d=new File(dst);
                try {
                    FileUtils.copyDirectory(s, d);
                } catch (IOException e) {
                    e.printStackTrace();
                }

                return null;
            }
        }
new bgTask().execute();

but i got this error:

05-17 11:26:55.455 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ java.io.FileNotFoundException: Source 'file:/android_asset/images' does not exist
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at org.apache.commons.io.FileUtils.copyDirectory(FileUtils.java:1368)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at org.apache.commons.io.FileUtils.copyDirectory(FileUtils.java:1261)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at org.apache.commons.io.FileUtils.copyDirectory(FileUtils.java:1230)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at mohammadi.behnam.telegramsticker.MainActivity$1bgTask.doInBackground(MainActivity.java:60)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at android.os.AsyncTask$2.call(AsyncTask.java:287)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:234)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
05-17 11:26:55.460 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
05-17 11:26:55.465 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
05-17 11:26:55.465 16182-16250/mohammadi.behnam.telegramsticker W/System.err﹕ at java.lang.Thread.run(Thread.java:841)