Eu estou tentando gerar um gráfico usando um localizador que puxa os dados de um banco de dados e preenche o gráfico usando os dados. A seguir está o código que preenche o gráfico. Todos os dados são armazenados em

"dataArraylist". Este código preenche os dados no gráfico

<code>        CategorySeries series = new CategorySeries("Bar Graph");     //"series" = graph
        for(int i=0; i< size; i++)
        {
            series.add("Bar"+(i+1), dataArraylist.get(i));                      //add each of the value to the series i.e graph
        }


        XYMultipleSeriesDataset dataset= new XYMultipleSeriesDataset(); 
        dataset.addSeries(series.toXYSeries());                                       //add the graph into a dataset


        // customisation for the first line
        XYSeriesRenderer renderer = new XYSeriesRenderer();
        renderer.setDisplayChartValues(true);
        renderer.setChartValuesSpacing((float) 0.5);
        renderer.setColor(Color.WHITE);

        XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); //create a new renderer.
        mRenderer.addSeriesRenderer(renderer); //renderer lets one to change the proerties of the graph i.e line colour etc
        mRenderer.setXTitle("X VALUES");
        mRenderer.setXTitle("Y VALUES");

        mRenderer.setChartTitle("This is title");

        Intent intent = ChartFactory.getBarChartIntent(context, dataset, mRenderer,Type.DEFAULT, "Title"); //package the whole chart together


        return intent;
</code>

no entanto, quando tento compilá-lo, recebo o erro Null Exception, a seguir está o erro recebido após a exceção nula:

<code>                       04-07 21:09:31.713: E/AndroidRuntime(4091): java.lang.IllegalStateException: Could not execute method of the activity
</code>

Eu também estou tendo problemas em passar os dados de uma atividade para a atividade gráfica. Uma resposta seria apreciada

Log completo é:

<code>                   04-07 21:09:31.674: D/AndroidRuntime(4091): Shutting down VM
04-07 21:09:31.674: W/dalvikvm(4091): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-07 21:09:31.713: E/AndroidRuntime(4091): FATAL EXCEPTION: main
04-07 21:09:31.713: E/AndroidRuntime(4091): java.lang.IllegalStateException: Could not execute method of the activity
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.view.View$1.onClick(View.java:2144)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.view.View.performClick(View.java:2485)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.view.View$PerformClick.run(View.java:9080)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.os.Handler.handleCallback(Handler.java:587)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.os.Looper.loop(Looper.java:123)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.app.ActivityThread.main(ActivityThread.java:3683)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at java.lang.reflect.Method.invokeNative(Native Method)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at java.lang.reflect.Method.invoke(Method.java:507)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at dalvik.system.NativeStart.main(Native Method)
04-07 21:09:31.713: E/AndroidRuntime(4091): Caused by: java.lang.reflect.InvocationTargetException
04-07 21:09:31.713: E/AndroidRuntime(4091):     at java.lang.reflect.Method.invokeNative(Native Method)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at java.lang.reflect.Method.invoke(Method.java:507)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at android.view.View$1.onClick(View.java:2139)
04-07 21:09:31.713: E/AndroidRuntime(4091):     ... 11 more
04-07 21:09:31.713: E/AndroidRuntime(4091): Caused by: java.lang.NullPointerException
04-07 21:09:31.713: E/AndroidRuntime(4091):     at hudds.fc.coach.ReadinessGraph.getIntent(ReadinessGraph.java:45)
04-07 21:09:31.713: E/AndroidRuntime(4091):     at hudds.fc.coach.Overview.generateGraph(Overview.java:101)
04-07 21:09:31.713: E/AndroidRuntime(4091):     ... 14 more
04-07 21:09:34.746: I/Process(4091): Sending signal. PID: 4091 SIG: 9
</code>

O código a seguir faz o download dos dados do banco de dados:

<code>        try {
        if (json.getString(KEY_SUCCESS) != null) {

            String getsize=json.getString("size");
            size = Integer.parseInt(getsize);

            for (int i = 0; i < size; i++) { 
            String getRating=json.getJSONArray("number").getJSONObject(i).getString("rating_number");
            int rating = Integer.parseInt(getRating);


            readinessRatng.add(rating);
            String printratings=readinessRatng.toString();
            Log.e("ratings are", printratings);
            }

        }


    else{

                     }
        }

    catch (JSONException e) {
        e.printStackTrace();
            }
</code>