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POClassCastException Double to Float
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  1. POClassCastException Double to Float
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    copied!<p>For some reason, this code is throwing a <code>ClassCastException</code>, telling me that I cannot cast a Double to a Float. The exception emanates from the first line of code below. <code>mapData.speeds</code> is an <code>ArrayList&lt;Float&gt;</code>. Where is the Double?</p> <pre><code>float spd = mapData.speeds.get(focusPointIndex); spd = (spd * 3600/1609.34); </code></pre> <p>Here is the complete stack trace:</p> <pre><code>03-31 01:00:51.008: E/AndroidRuntime(17778): FATAL EXCEPTION: main 03-31 01:00:51.008: E/AndroidRuntime(17778): java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Float 03-31 01:00:51.008: E/AndroidRuntime(17778): at net.taptools.android.trailtracker.ResultsMapViewingFragment$4.onMapLongClick(ResultsMapViewingFragment.java:224) 03-31 01:00:51.008: E/AndroidRuntime(17778): at com.google.android.gms.maps.GoogleMap$5.onMapLongClick(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at com.google.android.gms.internal.k$a.onTransact(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at android.os.Binder.transact(Binder.java:326) 03-31 01:00:51.008: E/AndroidRuntime(17778): at com.google.android.gms.maps.internal.IOnMapLongClickListener$Stub$Proxy.onMapLongClick(IOnMapLongClickListener.java:93) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.i.s.a(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.y.v.d(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.y.bf.onLongPress(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.d.v.onLongPress(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.d.h.c(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.d.h.c(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at maps.d.j.handleMessage(Unknown Source) 03-31 01:00:51.008: E/AndroidRuntime(17778): at android.os.Handler.dispatchMessage(Handler.java:99) 03-31 01:00:51.008: E/AndroidRuntime(17778): at android.os.Looper.loop(Looper.java:137) 03-31 01:00:51.008: E/AndroidRuntime(17778): at android.app.ActivityThread.main(ActivityThread.java:5059) 03-31 01:00:51.008: E/AndroidRuntime(17778): at java.lang.reflect.Method.invokeNative(Native Method) 03-31 01:00:51.008: E/AndroidRuntime(17778): at java.lang.reflect.Method.invoke(Method.java:511) 03-31 01:00:51.008: E/AndroidRuntime(17778): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792) 03-31 01:00:51.008: E/AndroidRuntime(17778): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555) 03-31 01:00:51.008: E/AndroidRuntime(17778): at dalvik.system.NativeStart.main(Native Method) </code></pre> <h1>--edit--</h1> <p>I think I have found what has caused the error, but still do not know why it is occurring, or how to fix it. I am parsing the mapData Object out of JSON, and because it contains many ArrayLists of various types, I created a method that will parse a JSONArray into and ArrayList of a designated type. Here is the method.</p> <pre><code>private &lt;T&gt; ArrayList&lt;T&gt; JSONArrayToList(JSONArray jsonArr){ ArrayList&lt;T&gt; arrList = new ArrayList&lt;T&gt;(); for(int i = 0; i&lt;jsonArr.length(); i++){ try { arrList.add((T)jsonArr.get(i)); } catch (JSONException e){e.printStackTrace();} } return arrList; } </code></pre>
 

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