如果作为参数传递，“字符串…参数”是什么意思？

• Z时代
• 2024-01-10
• 分类：问答

我在网上找到了这段代码，其中有一部分我不理解。对于doInBackground方法，传递的参数为String...params。有人可以告诉我这是什么意思吗？那是...什么

public class AsyncHttpPost extends AsyncTask<String, String, String> {
    private HashMap<String, String> mData = null;// post data
    /**
     * constructor
     */
    public AsyncHttpPost(HashMap<String, String> data) {
        mData = data;
    }
    /**
     * background
     */
    @Override
    protected String doInBackground(String... params) {
        byte[] result = null;
        String str = "";
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(params[0]);// in this case, params[0] is URL
        try {
            // set up post data
            ArrayList<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
            Iterator<String> it = mData.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                nameValuePair.add(new BasicNameValuePair(key, mData.get(key)));
            }
            post.setEntity(new UrlEncodedFormEntity(nameValuePair, "UTF-8"));
            HttpResponse response = client.execute(post);
            StatusLine statusLine = response.getStatusLine();
            if(statusLine.getStatusCode() == HttpURLConnection.HTTP_OK){
                result = EntityUtils.toByteArray(response.getEntity());
                str = new String(result, "UTF-8");
            }
        }
        catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
        }
        return str;
    }
    /**
     * on getting result
     */
    @Override
    protected void onPostExecute(String result) {
        // something...
    }
}

回答：

doInBackground(String… params)

// params represents a vararg.

new AsyncHttpPost().execute(s1,s2,s3); // pass strings to doInbackground

params[0] is the first string

params[1] is the second string

params[2] is the third string

http://developer.android.com/reference/android/os/AsyncTask.html#doInBackground（Params

…）

异步任务的参数传递给 doInBackground

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