错误http连接android.os.networkonmainthreadexception [英] Error in http connection android.os.networkonmainthreadexception
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问题描述
我写的应用程序为Android，我有一个问题。它适用于手机，但它不能在平板电脑工作。
我有错误：http连接android.os.networkonmainthreadexception错误。这是我的code：
公共类AktualizacjaActivity {
公共静态最后弦乐KEY_121 =HTTP：//xxx.php
公共字符串getServerData（字符串returnString，上下文的背景下）{
DatabaseAdapter DB1 =新DatabaseAdapter（背景）;
db1.open（）;
字符串的问题=;
尝试
{ 光标C = db1.makeCursor（DatabaseAdapter.STRUCT，新的String [] {} DatabaseAdapter.ID，DatabaseAdapter.KODE_ID +='+ returnString +'，NULL）;
c.moveToFirst（）;
问题+ =NOT IN（';
而（！c.isLast（））
{
问题+ = c.getString（c.getColumnIndex（DatabaseAdapter.ID））+'，';
c.moveToNext（）;
}
问题+ = c.getString（c.getColumnIndex（DatabaseAdapter.ID））+'）; }
赶上（例外五）
{ } db1.close（）;
如果（question.equalsIgnoreCase（NOT IN（'））的问题=;
InputStream为= NULL; 字符串结果=;
//一年要发送的数据，warunek韩国większyOD 1980年
ArrayList的＆LT;＆的NameValuePair GT; namevaluepairs中=新的ArrayList＆LT;＆的NameValuePair GT;（）;
nameValuePairs.add（新BasicNameValuePair（code_ID，returnString））;
nameValuePairs.add（新BasicNameValuePair（否，问题））; // HTTP POST
尝试{
HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httppost =新HttpPost（KEY_121）;
httppost.setEntity（新UrlEn codedFormEntity（namevaluepairs中））;
HTT presponse响应= httpclient.execute（httppost）;
HttpEntity实体= response.getEntity（）;
是= entity.getContent（）;
}赶上（例外五）{
Log.e（log_tag，在HTTP连接错误+ e.toString（））;
} //响应转换为字符串
尝试{
读者的BufferedReader =新的BufferedReader（新的InputStreamReader（是，ISO-8859-2），8）;
StringBuilder的SB =新的StringBuilder（）;
串线= NULL;
而（（行= reader.readLine（））！= NULL）{
sb.append（行+\\ n）;
}
is.close（）;
结果= sb.toString（）; }赶上（例外五）{
Log.e（log_tag，错误转换结果+ e.toString（））;
}
//解析JSON数据
DatabaseAdapter DB =新DatabaseAdapter（背景）;
db.open（）;
尝试{
JSONArray jArray =新JSONArray（结果）; 的for（int i = 0; I＆LT; jArray.length（）;我++）{
JSONObject的json_data = jArray.getJSONObject（I） db.addItmem（INSERT INTO my_kodeks_struktura VALUES（
+ json_data.getInt（ID）+，
+ json_data.getInt（code_ID）+，+
json_data.getInt（position_art）+，+
json_data.getString（position_art_a）+'，+
json_data.getInt（电平）+，+
json_data.getString（名称）+'）;）; }
}赶上（JSONException E）{
Log.e（log_tag，错误分析数据+ e.toString（））;
}
db.close（）;
返回UPD}}
解决方案
这是作为异常说：你不能对UI线程HTTP调用。至少不会在较新的操作系统。
考虑使用AsyncTask的此类调用。
I wrote app for android and i have one problem. It works on phone, but it doesn't work on tablet. I have Error : Error in http connection android.os.networkonmainthreadexception. It is my code:
public class AktualizacjaActivity { public static final String KEY_121 = "http://xxx.php";
public String getServerData(String returnString,Context context) {
DatabaseAdapter db1 = new DatabaseAdapter(context);
db1.open();
String question="";
try
{
Cursor c = db1.makeCursor(DatabaseAdapter.STRUCT, new String[] {DatabaseAdapter.ID},DatabaseAdapter.KODE_ID+"='"+returnString+"'",null);
c.moveToFirst();
question+="NOT IN('";
while(!c.isLast())
{
question+=c.getString(c.getColumnIndex(DatabaseAdapter.ID))+"','";
c.moveToNext();
}
question+=c.getString(c.getColumnIndex(DatabaseAdapter.ID))+"')";
}
catch(Exception e)
{
}
db1.close();
if(question.equalsIgnoreCase("NOT IN('")) question="";
InputStream is = null;
String result = "";
//the year data to send, warunek rok większy od 1980
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("code_id",returnString));
nameValuePairs.add(new BasicNameValuePair("no", question));
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(KEY_121);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"ISO-8859-2"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
//parse json data
DatabaseAdapter db = new DatabaseAdapter(context);
db.open();
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
db.addItmem("INSERT INTO my_kodeks_struktura VALUES("
+json_data.getInt("id")+","
+json_data.getInt("code_id")+","+
json_data.getInt("position_art")+",'"+
json_data.getString("position_art_a")+"',"+
json_data.getInt("level")+",'"+
json_data.getString("name")+"');");
}
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
db.close();
return "Upd";
}
}
解决方案
it's as the exception says: you cannot make http calls on ui thread. at least not on newer OS.
consider using AsyncTask for such calls.
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