刚入门学习Android的小白，正在学写Android网络通信，用的是HttpURLConnection，但在真机上测试程序总是崩溃，
MainActivity中的代码如下
package com.example.httpurl;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
public static final int SHOW_RESPONSE=0;
private Button sendRequest;
private TextView responseText;
private Handler handler =new Handler(){
public void handleMessage(Message msg){
switch(msg.what){
case SHOW_RESPONSE:
String response =(String) msg.obj;
responseText.setText(response);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sendRequest =(Button)findViewById(R.id.send_request);
responseText=(TextView) findViewById(R.id.response);
sendRequest.setOnClickListener(this);
}
public void onClick(View v){
if(v.getId()==R.id.send_request)
{
sendRequestWithHttpURLConnection();
}
}
private void sendRequestWithHttpURLConnection() {
// TODO Auto-generated method stub
new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
HttpURLConnection connection=null;
try{
URL url =new URL("http://www.baidu.com");
connection=(HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
InputStream in=connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder response =new StringBuilder();
String line;
while((line=reader.readLine()) != null){
response.append(line);
}
Message message = new Message();
message.what =SHOW_RESPONSE;
message.obj =response.toString();
handler.sendMessage(message);
}catch(Exception e){
e.printStackTrace();
}finally{
if(connection !=null)
{
connection.disconnect();
}
}
}
}).start();
}
@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
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
后面发现了是xml文件的问题，但是
点击按钮不会返回相应的数据，使用Logcat查看出现以下内容，没太能看懂，求解谢谢！
