伙计们，我正在尝试将我的 android 应用程序连接到 php 服务器并使用 json 来编码数据。我无法在应用程序上对其进行解码。请帮忙
public class JsonDemoActivity extends Activity implements OnClickListener{
/** Called when the activity is first created. */
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv=(TextView) findViewById(R.id.textView1);
Button b=(Button) findViewById(R.id.button1);
b.setOnClickListener(this);
}
public void onClick(View v) {
// TODO Auto-generated method stub
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://10.0.2.2/jsondemo.php"); // make sure the url is correct.
response=httpclient.execute(httppost);
HttpEntity he=response.getEntity();
JSONObject jo=new JSONObject(EntityUtils.toString(he));
String message=jo.getString("message");
String from=jo.getString("from");
String to=jo.getString("to");
tv.setText("Message "+message+"/n"+"from "+from+"/n"+"to "+to);
tv.setText("Response from PHP : " + response);
}catch(Exception e){
System.out.println("Exception : " + e.getMessage());
tv.setText(e.getLocalizedMessage());
System.out.println("Response from php"+response);
}
}
}
这是php端代码
<?php
header('Content-Type: application/json');
$obj = new stdClass();
$obj->message="hello";
$obj->from="pratik";
$obj->to="server";
echo json_encode($obj);
?>
我收到错误无法将 json 转换为字符串。