Question

为什么android在线程中请求网络数据会报错?去掉线程就好了,有没有大神知道,急!!下面是加 了线程的代码

new Thread() {
@Override
public void run() {
try {
String url = new Tool().url+"getQuestion";
HttpResponse httpResponse = null;
HttpPost httpPost = new HttpPost(url);
List<NameValuePair> params = new ArrayList<NameValuePair>();
httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
httpResponse = new DefaultHttpClient().execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() == 200)
{
result = EntityUtils.toString(httpResponse.getEntity()).replaceAll("\r", "");
Toast.makeText(getApplicationContext(), result, 1).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();

Answer 1

Toast.makeText(getApplicationContext(), result, 1).show();
本质是进行UI更新
需要在主线程下调用
网络访问的处理结果需要通过handler发送消息
然后在handler内对接收到的不同消息进行分别处理
handler是运行在主线程下， 可以进行UI更新