(HttpURLConnection)url.openConnection()运行错误
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下一篇 2013-08-29 16:51:18
/ 个人分类：step by step android测试
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
运行上面的代码时出现错误：
android.os.NetworkOnMainThreadException
这个方法只在4.0以前的，4.0以后，必须在子线程中进行url的访问：
protected void urlConn(){
new AsyncTask<Void,Void,String>(){
@Override
protected String doInBackground(Void... voids) {
String content="";
try {
URL url=new URL(googleWeatherUrl1);
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
if(httpURLConnection.getResponseCode()==HttpURLConnection.HTTP_OK){
Toast.makeText(getApplicationContext(),"连接Google Weather API成功!", Toast.LENGTH_LONG).show();
InputStreamReader inputStreamReader=
new InputStreamReader(httpURLConnection.getInputStream(),"utf-8");
int i;
//read
while (((i=inputStreamReader.read())!=-1)){
content=content+(char)i;
}
inputStreamReader.close();
}
httpURLConnection.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
return content;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String content) {
super.onPostExecute(content);
}
}.execute();
}
如果你看了链接中的
文章的话，会发现上面代码中TOAST方法会导致错误，Caused by:
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()。我们需要将与网络连接无关的代码移出这个线程之外。
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