android访问网络提示服务不可用,Android系统服务不可用-优快云博客

我打算从我的网站获取数据，然后将该信息放入微调器中。我用一些教程，我想出了这个代码Android系统服务不可用

package com.thenewboston.christian;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.NameValuePair;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import android.app.Activity;

import android.app.ProgressDialog;

import android.os.AsyncTask;

import android.os.Bundle;

import android.util.Log;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

public class hospitalhttp extends Activity{

private ProgressDialog pDialog;

JSONParser jParser = new JSONParser();

private static String url_all_products = "http://www.photosbychristian.com/ems/hospitals.php";

//private static final String TAG_HID = "hid";

private static final String TAG_HOSPITAL = "hospital";

JSONArray hosps = null;

ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item);

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.spinnertest);

new LoadAllProducts().execute();

}

class LoadAllProducts extends AsyncTask {

/**

* Before starting background thread Show Progress Dialog

* */

@Override

protected void onPreExecute() {

super.onPreExecute();

pDialog = new ProgressDialog(hospitalhttp.this);

pDialog.setMessage("Loading hospitals. Please wait...");

pDialog.setIndeterminate(false);

pDialog.setCancelable(false);

pDialog.show();

}

/**

* getting All products from url

* */

protected String doInBackground(String... args) {

// Building Parameters

List params = new ArrayList();

// getting JSON string from URL

JSONObject json = jParser.makeHttpRequest(url_all_products, "GET",

params);

// Check your log cat for JSON reponse

Log.d("All Products: ", json.toString());

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

try {

// products found

// Getting Array of Products

hosps = json.getJSONArray("PA");

// looping through All Products

for (int i = 0; i < hosps.length(); i++) {

JSONObject c = hosps.getJSONObject(i);

// Storing each json item in variable

//String id = c.getString(TAG_HID);

String name = c.getString(TAG_HOSPITAL);

adapter.add(name);

}

} catch (JSONException e) {

e.printStackTrace();

}

return null;

}

/**

* After completing background task Dismiss the progress dialog

* **/

protected void onPostExecute(String file_url) {

// dismiss the dialog after getting all products

pDialog.dismiss();

// updating UI from Background Thread

runOnUiThread(new Runnable() {

public void run() {

/**

* Updating parsed JSON data into ListView

Spinner state = (Spinner) findViewById(R.id.spinner1);

state.setAdapter(adapter);

}

});

}

我尝试运行我的应用程序和我得到这个错误

02-22 22:29:48.131: E/AndroidRuntime(1200): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.thenewboston.christian/com.thenewboston.christian.hospitalhttp}: java.lang.IllegalStateException: System services not available to Activities before onCreate()

所以我把所有的这个OnCreate中bolck和我后仍然得到同样的错误