java如何在字符串数组中使用Arraylist？

Question

我正在从JSON URL创建一个图像视图，在这里我正在数组列表中推送URL。这是代码

private class JSONParse extends AsyncTask<String, String, JSONObject> {
    private ProgressDialog pDialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        ver = (TextView) findViewById(R.id.vers);
        name = (TextView) findViewById(R.id.name);
        api = (TextView) findViewById(R.id.api);
        pDialog = new ProgressDialog(AnotherActivity.this);
        pDialog.setMessage("Getting Data ...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected JSONObject doInBackground(String... args) {

        JSONParser jParser = new JSONParser();
        // Getting JSON from URL
        JSONObject json = jParser.getJSONFromUrl(url);

         try {
            // Getting JSON Array from URL
            安卓 = json.getJSONArray(TAG_OS);
            for (int i = 0; i < 安卓.length(); i++) 
                {
                map = new ArrayList<HashMap<String, String>>();
                JSONObject c = 安卓.getJSONObject(i);
                // Storing each json item in variable
                String flag = c.getString("flag");
                HashMap<String, String> map = new HashMap<String, String>();
                map.put("url",flag);
                arraylist.add(i,"\"" + map.toString().substring(5).replace("}", "\""));
            }
           final  String[] imageUrl= arraylist.toArray(new String[arraylist.size()]);
            Log.v("url", "Creating view..." + imageUrl);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }
} 

现在我想在字符串数组中使用这个数组列表

String[] IMAGES = new String[]{

};

我该怎么做？？当我尝试这样的东西时

String[] imageUrl= arraylist.toArray(new String[arraylist.size()]);

我拿到了日志

Creating view...[Ljava.lang.String;@41450ea0

Answer 1

使用Arrays.toString(array[])方法打印数组，因为这里您得到的[Ljava.lang.String;@41450ea0是数组的Object引用

 String[] imageUrl= arraylist.toArray(new String[arraylist.size()]);
 Log.v("url", "Creating view..." + Arrays.toString(imageUrl));

它将打印这样的数组

[element1,element2...]

---

您可以使用indexOf删除[ ]

String s= Arrays.toString(imageUrl);
s = s.substring(1, s.length()-1)