ClassCastException异常：的java.lang.Object []不能转换为java.lang.String []机器人 [英] ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[] android

问题描述

在我的应用程序，我需要我的ArrayList转换成一个数组的字符串。不过，我得到一个错误：

  ClassCastException异常：的java.lang.Object []不能转换为java.lang.String []机器人
 

在与 listofurls 我收到错误的行： listofurls =（字符串[]）image_urls.toArray（）;

这是全code：

 公共类Test2的扩展AsyncTask的＆LT;虚空，虚空，虚空＆GT;
{
  的String [] listofurls;
  私有静态最后字符串URL =htt​​p://www.tts.com/album_pro/array_to_en$c$c;
  JSONParser jParser =新JSONParser（）;
  ArrayList的＆LT;字符串＆GT; image_urls =新的ArrayList＆LT;字符串＆GT;（）;

  在preExecute保护无效（）{
    //Log.e(LOG_CLASS，在侧assyntask）;
  }

  保护无效doInBackground（虚空......空隙）{
    Log.v（异步，异步）;
    JSONObject的JSON = jParser.getJSONFromUrl（URL）;

    尝试 {
      JSONObject的SEO = json.getJSONObject（SEO）;
      JSONArray对开= seo.getJSONArray（开本）;

      // JSONArray image_urls1 =新JSONArray（）;
      //字符串S1 = seo.getString（开本）;

      的for（int i = 0; I＆LT; folio.length（）; ++ I）{
        串m = folio.getString（ⅰ）;
        Log.v（M+ I，M）;
        image_urls.add（米）;
        日志（测试URL+ image_urls）;
      }
    }赶上（例外五）{
      e.printStackTrace（）;
    }

    listofurls =（字符串[]）image_urls.toArray（）; //错误这里发生

    返回null;
  }

  私人无效日志（字符串字符串）{
    Log.v（测试，字符串）;
  }

  保护无效onProgressUpdate（整数...进度）{}

  保护无效onPostExecute（无效的结果）{
    mAdapter =新ImagePagerAdapter（getSupportFragmentManager（），listofurls.length）;
    mAdapter.setImageurls（listofurls）;
    mPager.setAdapter（mAdapter）;
  }
 

解决方案

尝试

  listofurls = image_urls.toArray（新的String [image_urls.size（））;
 

注：我建议重新命名listofurls到arrayOfURLs

In my application I need to convert my arraylist to a string of an array. However, I am getting an error:

ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[] android

At the line with listofurls I am getting the error: listofurls = (String[])image_urls.toArray();

This is the full code:

public class Test2 extends AsyncTask<Void, Void, Void> 
{
  String[] listofurls ;
  private static final String url = "http://www.tts.com/album_pro/array_to_encode";
  JSONParser jParser = new JSONParser();
  ArrayList<String> image_urls = new ArrayList<String>();

  protected void onPreExecute() {
    //Log.e(LOG_CLASS, "in side assyntask");
  }

  protected Void doInBackground(Void... voids) {
    Log.v("Async","Async");
    JSONObject json = jParser.getJSONFromUrl(url);

    try {
      JSONObject seo = json.getJSONObject("SEO");
      JSONArray folio = seo.getJSONArray("Folio");

      // JSONArray image_urls1 = new JSONArray();
      //String s1=seo.getString("Folio");

      for(int i=0;i<folio.length();++i) {
        String m = folio.getString(i);
        Log.v("M"+i,m);
        image_urls.add(m);
        Log("test-url"+image_urls);
      }
    } catch(Exception e) {
      e.printStackTrace();
    }

    listofurls = (String[])image_urls.toArray();  //ERROR OCCURS HERE

    return null;
  }

  private void Log(String string) {
    Log.v("Test",string);
  }

  protected void onProgressUpdate(Integer... progress) { }

  protected void onPostExecute(Void result) {
    mAdapter = new ImagePagerAdapter(getSupportFragmentManager(),listofurls.length );
    mAdapter.setImageurls(listofurls);
    mPager.setAdapter(mAdapter);
  }

解决方案

try

listofurls = image_urls.toArray(new String[image_urls.size()]);

Note: I suggest to rename listofurls to arrayOfURLs

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