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POIllegalStateException "System services not available to Activities before onCreate()"
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copied!<p>I investigate that problem but can not find any solution for my code. I have four classes. But i am sure, no problem on class named Connect(You will see its object on class JsonData below.)So i share the other three classes. My MainActivity is;</p> <pre><code>public class MainActivity extends Activity { String keys[] = {"Message", "Subject", "MessageType", "SentTime", "ToName", "Id"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); JsonData.keys=keys; JsonData jsonData = new JsonData(); ArrayList<HashMap<String, String>> dataList = new ArrayList<HashMap<String, String>>(); dataList= jsonData.GetData(); } } </code></pre> <p>I send keyvalues for json and then take data from any url(it is private, i delete it) on class JsonData;</p> <pre><code>public class JsonData extends Activity{ Connect connect = new Connect(); private String url = "url"; static String keys[]; public ArrayList<HashMap<String, String>> GetData() { JSONArray json = null; ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>(); InternetCheck netCheck = new InternetCheck(); if(netCheck.isInternetOn()){ try { JSONObject result = connect .connect(url); json = result.getJSONArray("d"); for (int i = 0; i < json.length(); i++) { HashMap<String, String> hashmap = new HashMap<String, String>(); JSONObject json2 = json.getJSONObject(i); for (int j = 0; j < keys.length; j++){ hashmap.put(keys[j], json2.getString(keys[j])); } mylist.add(hashmap); } } catch (Exception e) { e.printStackTrace(); } } else Toast.makeText(this, " Check Internet Options. ", Toast.LENGTH_LONG).show(); return mylist; } } </code></pre> <p>In this class, i check internet connection from object netCheck. I think my problem is on that class. <strong>InternetCheck.java</strong> ;</p> <pre><code>public class InternetCheck extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } public final boolean isInternetOn() { // get Connectivity Manager object to check connection ConnectivityManager connec = (ConnectivityManager)getSystemService(getBaseContext().CONNECTIVITY_SERVICE); // Check for network connections if ( connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.CONNECTED || connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.CONNECTING || connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTING || connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTED ) { return true; } else if ( connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.DISCONNECTED || connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.DISCONNECTED ) { return false; } return false; } } </code></pre> <p>I am suspecting from the commented line **//get Connectivity Manager object to check connection ** . Finally my Logcat;</p> <pre><code>08-27 10:13:45.449: E/AndroidRuntime(24925): FATAL EXCEPTION: main 08-27 10:13:45.449: E/AndroidRuntime(24925): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jsonparser/com.example.jsonparser.MainActivity}: java.lang.IllegalStateException: System services not available to Activities before onCreate() 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1659) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.ActivityThread.access$1500(ActivityThread.java:121) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.os.Handler.dispatchMessage(Handler.java:99) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.os.Looper.loop(Looper.java:130) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.ActivityThread.main(ActivityThread.java:3768) 08-27 10:13:45.449: E/AndroidRuntime(24925): at java.lang.reflect.Method.invokeNative(Native Method) 08-27 10:13:45.449: E/AndroidRuntime(24925): at java.lang.reflect.Method.invoke(Method.java:507) 08-27 10:13:45.449: E/AndroidRuntime(24925): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878) 08-27 10:13:45.449: E/AndroidRuntime(24925): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636) 08-27 10:13:45.449: E/AndroidRuntime(24925): at dalvik.system.NativeStart.main(Native Method) 08-27 10:13:45.449: E/AndroidRuntime(24925): Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate() 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.Activity.getSystemService(Activity.java:3536) 08-27 10:13:45.449: E/AndroidRuntime(24925): at com.example.jsonparser.InternetCheck.isInternetOn(InternetCheck.java:19) 08-27 10:13:45.449: E/AndroidRuntime(24925): at com.example.jsonparser.JsonData.GetData(JsonData.java:25) 08-27 10:13:45.449: E/AndroidRuntime(24925): at com.example.jsonparser.MainActivity.onCreate(MainActivity.java:21) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 08-27 10:13:45.449: E/AndroidRuntime(24925): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623) </code></pre> <p>I'm saying again, i looked over other questions but no solution available for me. Thanks in advance.</p>

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