什么是“String ... params”是否作为参数传递? [英] What does "String... params" mean if passed as a parameter?
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问题描述
我在网上找到了这个代码,有一部分我不明白。对于方法doInBackground,传递的参数是 String ... params
。有人可以向我解释这意味着什么?那是什么 ...
?
I found this code online and there's 1 part I don't understand. For the method doInBackground, the parameter passed is String... params
. Could someone please explain to me what that means? What is that ...
?
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...
}
}
推荐答案
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
The parameters of the asynchronous task are passed to doInBackground
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