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POGoogle Maps android API, drawing polylines in a loop
 

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  1. POGoogle Maps android API, drawing polylines in a loop
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    <p>I have two String arrays, <code>latitude</code> and <code>longitude</code> I want to draw polylines on the map, the <a href="https://developers.google.com/maps/documentation/android/lines#add_a_polyline" rel="nofollow">documentation</a> says, that it's as easy as pie. And it is. If I add polylines manually like this, it works:</p> <pre><code>PolylineOptions rectOptions = new PolylineOptions() .add(new LatLng(37.35, -122.0)) .add(new LatLng(37.45, -122.0)) .add(new LatLng(37.45, -122.2)) </code></pre> <p>But the problem starts when I'm trying to loop adding polylines:</p> <pre><code> rectOptions = new PolylineOptions(); for(int i = 0; i&lt;latitude.length(); i++){ rectOptions.add(new LatLng(Long.getLong(latitude[i]), Long.getLong(longitude[i]))); // Log.d("coordinates", latitude[i]+"|"+longitude[i]); } </code></pre> <p>I get a <code>java.lang.NullPointerException</code> And I don't know why. I know the problem is in the <code>rectOptions.add()</code> method, because <code>Log.d("coordinates", latitude[i]+"|"+longitude[i]);</code> works fine in the same loop.</p> <p>Here's the output of LogCat:</p> <pre><code> 01-02 11:59:27.380: E/AndroidRuntime(25146): FATAL EXCEPTION: main 01-02 11:59:27.380: E/AndroidRuntime(25146): java.lang.NullPointerException 01-02 11:59:27.380: E/AndroidRuntime(25146): at com.shniv.MainActivity$1.onClick(MainActivity.java:82) 01-02 11:59:27.380: E/AndroidRuntime(25146): at android.view.View.performClick(View.java:3519) 01-02 11:59:27.380: E/AndroidRuntime(25146): at android.view.View$PerformClick.run(View.java:14140) 01-02 11:59:27.380: E/AndroidRuntime(25146): at android.os.Handler.handleCallback(Handler.java:605) 01-02 11:59:27.380: E/AndroidRuntime(25146): at android.os.Handler.dispatchMessage(Handler.java:92) 01-02 11:59:27.380: E/AndroidRuntime(25146): at android.os.Looper.loop(Looper.java:137) 01-02 11:59:27.380: E/AndroidRuntime(25146): at android.app.ActivityThread.main(ActivityThread.java:4456) 01-02 11:59:27.380: E/AndroidRuntime(25146): at java.lang.reflect.Method.invokeNative(Native Method) 01-02 11:59:27.380: E/AndroidRuntime(25146): at java.lang.reflect.Method.invoke(Method.java:511) 01-02 11:59:27.380: E/AndroidRuntime(25146): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787) 01-02 11:59:27.380: E/AndroidRuntime(25146): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554) 01-02 11:59:27.380: E/AndroidRuntime(25146): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. COCan you post the stack trace?.
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    2. CO@Mohan, I've added the output of LogCat, but there is nothing that can help in there.
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    3. COKindly check the onClick function once(Sorry If I'm wrong). I think there is a null reference.
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