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POAchartEngine - AddView on layout causes NullPointerException
 

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  1. POAchartEngine - AddView on layout causes NullPointerException
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    <p>i am trying to get rid of that error but i don't see anything wrong (for me) ; someone get that problem too but its was a bad id given to the layout : <a href="https://stackoverflow.com/questions/6318903/addview-causes-nullpointerexception">addView causes NullPointerException</a></p> <p>I took a simple code sample from <a href="http://www.javaadvent.com/2012/12/achartengine-charting-library-for.html" rel="nofollow noreferrer">http://www.javaadvent.com/2012/12/achartengine-charting-library-for.html</a></p> <pre><code>public class LineGraph extends Activity { private GraphicalView mChart; private XYMultipleSeriesDataset mDataset = new XYMultipleSeriesDataset(); private XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); private XYSeries mCurrentSeries; private XYSeriesRenderer mCurrentRenderer; private void initChart() { mCurrentSeries = new XYSeries("Sample Data"); mDataset.addSeries(mCurrentSeries); mCurrentRenderer = new XYSeriesRenderer(); mRenderer.addSeriesRenderer(mCurrentRenderer); } private void addSampleData() { mCurrentSeries.add(1, 2); mCurrentSeries.add(2, 3); mCurrentSeries.add(3, 2); mCurrentSeries.add(4, 5); mCurrentSeries.add(5, 4); } protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.graph); } protected void onResume() { super.onResume(); if (mChart == null) { LinearLayout layout = (LinearLayout) findViewById(R.id.chart); initChart(); addSampleData(); mChart = ChartFactory.getCubeLineChartView(this, mDataset, mRenderer, 0.3f); // Here is the problem =&gt; layout.addView(mChart); } else { mChart.repaint(); } } } </code></pre> <p>and my XML file :</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;LinearLayout android:id="@+id/chart" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" &gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>May be i missed an obvious mistake but the addView() gives me a nullPointerException, please someone can tell me what i have done wrong?</p> <p>EDIT : And the stacktrace </p> <pre><code>05-17 14:37:05.830: E/SensorManager(6703): thread start 05-17 14:37:06.885: E/SpannableStringBuilder(6703): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 05-17 14:37:06.885: E/SpannableStringBuilder(6703): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 05-17 14:37:28.800: E/AndroidRuntime(6703): FATAL EXCEPTION: main 05-17 14:37:28.800: E/AndroidRuntime(6703): java.lang.RuntimeException: Unable to resume activity {com.smartdroid/com.smartdroid.LineGraph}: java.lang.NullPointerException 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2616) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2644) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2130) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread.access$600(ActivityThread.java:140) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.os.Handler.dispatchMessage(Handler.java:99) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.os.Looper.loop(Looper.java:137) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread.main(ActivityThread.java:4898) 05-17 14:37:28.800: E/AndroidRuntime(6703): at java.lang.reflect.Method.invokeNative(Native Method) 05-17 14:37:28.800: E/AndroidRuntime(6703): at java.lang.reflect.Method.invoke(Method.java:511) 05-17 14:37:28.800: E/AndroidRuntime(6703): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 05-17 14:37:28.800: E/AndroidRuntime(6703): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 05-17 14:37:28.800: E/AndroidRuntime(6703): at dalvik.system.NativeStart.main(Native Method) 05-17 14:37:28.800: E/AndroidRuntime(6703): Caused by: java.lang.NullPointerException 05-17 14:37:28.800: E/AndroidRuntime(6703): at com.smartdroid.LineGraph.onResume(LineGraph.java:64) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1188) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.Activity.performResume(Activity.java:5280) 05-17 14:37:28.800: E/AndroidRuntime(6703): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2606) 05-17 14:37:28.800: E/AndroidRuntime(6703): ... 12 more 05-17 14:38:45.465: E/SensorManager(8335): thread start 05-17 14:38:46.630: E/SpannableStringBuilder(8335): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 05-17 14:38:46.630: E/SpannableStringBuilder(8335): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length </code></pre>
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    1. COstacktrace from logcat please?
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    2. COI'm afraid to seem stupid but you mean all messages from logcat when i start my application, right?
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    3. COno only error stacktrace from logcat. Kindly try once after cleaning your project
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