后httpclient.execute（HTTPGET）的Android code没有得到在试运行（使用的AsyncTask） [英] Android code after httpclient.execute(httpget) doesn't get run in try (using AsyncTask)
问题描述
我想从网站获取数据并解析到我的Android应用程序。 不幸的是我甚至不得到解析数据的一部分。 以下行后，code不运行：
的Htt presponse响应= httpclient.execute（HTTPGET）;
其结果是，邮件= 333。 当我使用Eclipse调试跨过它，我可以看到，它运行的线路。然后，我可以读出响应变量（= 200），但在这之后是不执行的行。 它没有达到444或其他code中的功能。 我已经宣布了Android清单上网权限。
在code：
进口android.os.Bundle;
进口android.app.Activity;
进口android.view.Menu;
进口org.apache.http.Htt presponse;
进口org.apache.http.StatusLine;
进口org.apache.http.client.HttpClient;
进口org.apache.http.client.methods.HttpGet;
进口org.apache.http.impl.client.DefaultHttpClient;
进口android.os.AsyncTask;
进口android.widget.TextView;
公共类MainActivity延伸活动{
TextView的消息;
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）;
消息=（TextView中）findViewById（R.id.message）;
message.setText（111）;
//新getinternetData .execute（）;
}
@覆盖
公共布尔onCreateOptionsMenu（功能菜单）{
//充气菜单;这增加了项目操作栏，如果它是present。
。getMenuInflater（）膨胀（R.menu.main，菜单）;
返回true;
}
@覆盖
保护无效的OnStart（）{
super.onStart（）;
新getinternetData（）执行（）;
//message.setText("OnStart）;
}
私有类getinternetData扩展的AsyncTask＆LT;字符串，太虚，字符串＆GT; {
@覆盖
保护字符串doInBackground（字符串... PARAMS）{
HttpClient的HttpClient的=新DefaultHttpClient（）;
HTTPGET HTTPGET =新HTTPGET（http://www.google.com）;
尝试{
message.setText（333）;
HTT presponse响应= httpclient.execute（HTTPGET）;
message.setText（444）;
状态行状态行= response.getStatusLine（）;
INT状态code = statusLine.getStatus code（）;
如果（状态code == 200）{
message.setText（可以连接）;
}其他
message.setText（无法连接）;
}赶上（例外五）{
message.setText（e.toString（））;
}
message.setText（555）;
返回null;
}
@覆盖
保护无效onPostExecute（字符串结果）{
//message.setText("Postsequence）;
}
}
我不知道我做错了。
是不是因为我没有使用的AsyncTask是否正确？
或者，也许不使用httpclient.execute是否正确？
编辑： 谢谢您的帮助 我已经改变了消息log.d，现在我可以看到，我可以连接。 该故障是在更新屏幕和这样的。我有很多东西要学。
下面是我改变code部分：
私有静态最后字符串变量=MainActivity;
@覆盖
保护字符串doInBackground（字符串... PARAMS）{
HttpClient的HttpClient的=新DefaultHttpClient（）;
HTTPGET HTTPGET =新HTTPGET（http://www.google.com）;
尝试{
//message.setText("333）;
Log.d（TAG，以前HTT presponse）;
HTT presponse响应= httpclient.execute（HTTPGET）;
Log.d（TAG，经过HTT presponse）;
状态行状态行= response.getStatusLine（）;
INT状态code = statusLine.getStatus code（）;
Log.d（TAG，之后的状态code，code =+状态code）;
如果（状态code == 200）{
Log.d（TAG，可以连接）;
}其他{
Log.d（TAG，无法连接）;
}
}赶上（例外五）{
Log.d（TAG，e.toString（））;
}
Log.d（TAG，退出做后台）;
返回null;
logcat的结果：
：D / MainActivity（22323）：在HTT presponse
一堆code
：D / MainActivity（22323）：在HTT presponse
：D / MainActivity（22323）：后状态code，code = 200
：D / MainActivity（22323）：可以连接
：D / MainActivity（22323）：退出做后台
一个问题，你必须是你正在试图更新从后台线程屏幕（消息）。使用AsyncTask.publishProgress（...）让主线程更新其onProgressUpdate（）方法的图形用户界面。
此外，而不是更新屏幕，考虑写日志消息Log.d（TAG，你在这里。）;看他们在logcat中
。这并没有解决HTTP问题，但清除这件事首先要确保你没有造成挂通过改变屏幕在后台线程。
I'm trying to get data from a website and parse it into my android application. Unfortunately I don't even get to the part of parsing the data. The code doesn't run after the following line:
HttpResponse response = httpclient.execute(httpget);
The result is that message = 333. When I step over it using the eclipse debugger, I can see that it runs that line. Then I can read out the response variable (=200) but the lines after that is doesn't execute. It doesn't reach the 444 or other code in the function. I have declared the internet permission in the Android manifest.
The Code:
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import android.os.AsyncTask;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView message;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
message = (TextView)findViewById(R.id.message);
message.setText("111");
//new getinternetData .execute("");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onStart(){
super.onStart();
new getinternetData().execute("");
//message.setText("OnStart");
}
private class getinternetData extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet("http://www.google.com");
try{
message.setText("333");
HttpResponse response = httpclient.execute(httpget);
message.setText("444");
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if(statusCode == 200){
message.setText("Could connect");
}else
message.setText("Couldn't connect");
}catch(Exception e){
message.setText(e.toString());
}
message.setText("555");
return null;
}
@Override
protected void onPostExecute(String result) {
//message.setText("Postsequence");
}
}
I don't know what I'm doing wrong.
Is it because I'm not using AsyncTask properly?
Or maybe not using the httpclient.execute properly?
EDIT: Thanks for the help I've changed the message to log.d and now I can see that I can connect. The fault is in updating the screen and such. I've got much to learn.
Here is my changed code part:
private static final String TAG = "MainActivity";
@Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet("http://www.google.com");
try{
//message.setText("333");
Log.d(TAG, "Before httpResponse");
HttpResponse response = httpclient.execute(httpget);
Log.d(TAG, "After httpResponse");
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
Log.d(TAG, "after statusCode, code= " +statusCode);
if(statusCode == 200){
Log.d(TAG, "Could connect");
}else{
Log.d(TAG, "Couldn't connect");
}
}catch(Exception e){
Log.d(TAG, e.toString());
}
Log.d(TAG, "Exit do in background");
return null;
Logcat result:
: D/MainActivity(22323): Before httpResponse
bunch of code
: D/MainActivity(22323): After httpResponse
: D/MainActivity(22323): after statusCode, code= 200
: D/MainActivity(22323): Could connect
: D/MainActivity(22323): Exit do in background
One problem you have is you are attempting to update the screen (message) from a background thread. Use AsyncTask.publishProgress(...) to let the main thread update the GUI in its onProgressUpdate() method.
Also rather than updating the screen, consider writing log messages Log.d(TAG, "You Are Here.); and watching them in logcat.
This doesn't address the HTTP issue, but clear this up first to be sure you are not causing a hang by changing the screen in a background thread.
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