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POAndroid Fragment inside RelativeLayout crashes app
 

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    <p>I am transitioning an app over to android and having some trouble with fragments.</p> <p>When I have no <code>RelativeLayout</code> and just <code>Fragment</code> it works fine, however with the introduction of the layout (rel or linear) it crashes. I am trying to add some buttons to the top of the map, preferably overlaid rather than in its own space.</p> <p>event_layout.xml:</p> <pre><code>&lt;RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/relativeLayout"&gt; &lt;fragment android:id="@+id/the_map" android:layout_width="match_parent" android:layout_height="match_parent" class="com.google.android.gms.maps.SupportMapFragment"/&gt; &lt;Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:text="Start service"/&gt; &lt;/RelativeLayout&gt; </code></pre> <p>MainActivity.java:</p> <pre><code>public class MainActivity extends FragmentActivity { // Fragment TabHost as mTabHost private FragmentTabHost mTabHost; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // set up the tabhost mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost); mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent); mTabHost.addTab(mTabHost.newTabSpec("event").setIndicator("Event Locations", getResources().getDrawable(R.drawable.ic_event_tab)), EventFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("itin").setIndicator("Itinerary", getResources().getDrawable(R.drawable.ic_itin_tab)), ItineraryFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("info").setIndicator("Kendal Info", getResources().getDrawable(R.drawable.ic_info_tab)), KendalInfoFragment.class, null); mTabHost.getTabWidget().setBackgroundColor(Color.WHITE); } @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; } } </code></pre> <p>EventFragment.java:</p> <pre><code>public class EventFragment extends FragmentActivity { private int userIcon, foodIcon, drinkIcon, shopIcon, otherIcon; private GoogleMap theMap; private LocationManager locMan; private Marker userMarker; public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View V = inflater.inflate(R.layout.event_layout, container, false); // now run code below the inflate if(theMap==null){ //map not instantiated yet theMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.the_map)).getMap(); } //theMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); //updatePlaces(); theMap.setMyLocationEnabled(true); theMap.moveCamera( CameraUpdateFactory.newLatLngZoom(new LatLng(54.328337, -2.743149) ,14) ); JSONArray arrayResultFromURL; // store the result of the data into the variable arrayResultFromURL = getJSONfromURL("http://www.websitewebsitestr.org/json.php?f=all&amp;type=dateAndTime"); try{ //Log.d("array_len", String.format("%d", arrayResultFromURL.length())); for(int i=0;i&lt;arrayResultFromURL.length();i++){ JSONObject json_data = arrayResultFromURL.getJSONObject(i); // assign attributes from the JSON string to local variables String id =json_data.getString("id"); String title =json_data.getString("title"); String strap; // define this for the try catch // this try catch is in case the client does not // put a strap in, title is mandatory try{ strap =json_data.getString("strap"); }catch(Exception e){ strap = ""; } Double lat = (double) 0; Double lon = (double) 0; // if the lat and long have not been entered then set them to 0 // otherwise an exception is thrown, and if it is lat and long will // become 0, putting them down south. try{ lat = (double) json_data.getDouble("lat"); }catch(Exception e){ lat = (double) 0; } try{ lon = (double) json_data.getDouble("long"); }catch(Exception e){ lon = (double) 0; } theMap.addMarker(new MarkerOptions() .position(new LatLng(lat, lon)) .title(title) .snippet(strap)); } }catch (Exception e){ Log.e("log_tag", "error in array: " + e.toString()); } //Log.d("log_tag", "result: " + res); //Log.d("log_tag", "point debug!"); //Log.d("myApp", res.toString()); userIcon = R.drawable.common_signin_btn_icon_dark; /*foodIcon = R.drawable.red_point; drinkIcon = R.drawable.blue_point; shopIcon = R.drawable.green_point; otherIcon = R.drawable.purple_point;*/ //return V; return inflater.inflate(R.layout.event_layout, container, false); } public static JSONArray getJSONfromURL(String url){ //initialize InputStream is = null; String result = ""; JSONArray jArray = null; //http post try { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); } catch (Exception e) { Log.e("log_tag", "Error in http connection "+e.toString()); } //convert response to string try { BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line); } is.close(); result=sb.toString(); } catch (Exception e) { Log.e("log_tag", "Error converting result "+e.toString()); } //try parse the string to a JSON object try { //Log.d("log_tag", "jresult: " + result + "finish"); jArray = new JSONArray(result); //Log.e("log_tag", "result: " + jArray.toString()); } catch (JSONException e) { Log.e("log_tag", "Error parsing data "+e.toString()); } return jArray; } public boolean onMarkerClick(Marker marker) { Log.d("Debug_log", "clicked!!"); return true; } } </code></pre> <p>It produces this error:</p> <pre><code> 07-01 11:00:29.428: E/AndroidRuntime(24381): FATAL EXCEPTION: main 07-01 11:00:29.428: E/AndroidRuntime(24381): java.lang.ClassCastException: co.uk.thewebsite.websitewebsitefest.EventFragment 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.support.v4.app.Fragment.instantiate(Fragment.java:394) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.support.v4.app.FragmentTabHost.doTabChanged(FragmentTabHost.java:339) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.support.v4.app.FragmentTabHost.onAttachedToWindow(FragmentTabHost.java:276) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.View.dispatchAttachedToWindow(View.java:6203) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1174) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1179) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1179) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1179) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.ViewRoot.performTraversals(ViewRoot.java:797) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.view.ViewRoot.handleMessage(ViewRoot.java:1921) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.os.Handler.dispatchMessage(Handler.java:99) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.os.Looper.loop(Looper.java:143) 07-01 11:00:29.428: E/AndroidRuntime(24381): at android.app.ActivityThread.main(ActivityThread.java:4196) 07-01 11:00:29.428: E/AndroidRuntime(24381): at java.lang.reflect.Method.invokeNative(Native Method) 07-01 11:00:29.428: E/AndroidRuntime(24381): at java.lang.reflect.Method.invoke(Method.java:507) 07-01 11:00:29.428: E/AndroidRuntime(24381): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 07-01 11:00:29.428: E/AndroidRuntime(24381): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 07-01 11:00:29.428: E/AndroidRuntime(24381): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I have tried using frames as suggested on other stackoverflow posts, however the app either crashed or bugged out and I was unable to resolve it. I have learned a lot over the past week in android and I am excited to learn much more in the future!</p>
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