It always say NullPointerException. Thank you
This is my code:
my OnCreate Method
//region transpo
mRef.orderByChild("expensetitle").equalTo("Transportation").addValueEventListener(new
ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//String transpo =
String.valueOf(dataSnapshot.child("expensetitle").getValue());
GenericTypeIndicator<HashMap<String, ExpenseData>> t = new
GenericTypeIndicator<HashMap<String, ExpenseData>>() {
};
HashMap<String, ExpenseData> expenses = dataSnapshot.getValue(t);
// Loop through it to get the sum
double sum = 0;
for (HashMap.Entry<String, ExpenseData> entry :
expenses.entrySet()) {
sum += entry.getValue().getAmount();
}
// You have your sum now
txt3.setText(String.valueOf(sum));
getTrans = Double.parseDouble(txt3.getText().toString());
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
//endregion
openChart();
}
MyChart method:
private void openChart() {
// Pie Chart Section Names
String[] code = new String[] { "Froyo", "Gingerbread",
"IceCream Sandwich", "Jelly Bean", "KitKat" };
// Pie Chart Section Value
double[] distribution = { getTrans, 9.1, 7.8, 45.5, 33.9 };
// Color of each Pie Chart Sections
int[] colors = { Color.BLUE, Color.MAGENTA, Color.GREEN, Color.CYAN,
Color.RED };
// Instantiating CategorySeries to plot Pie Chart
CategorySeries distributionSeries = new CategorySeries(
" Android version distribution as on October 1, 2012");
for (int i = 0; i < distribution.length; i++) {
// Adding a slice with its values and name to the Pie Chart
distributionSeries.add(code[i], distribution[i]);
}
// Instantiating a renderer for the Pie Chart
DefaultRenderer defaultRenderer = new DefaultRenderer();
for (int i = 0; i < distribution.length; i++) {
SimpleSeriesRenderer seriesRenderer = new SimpleSeriesRenderer();
seriesRenderer.setColor(colors[i]);
seriesRenderer.setDisplayChartValues(true);
//Adding colors to the chart
defaultRenderer.setBackgroundColor(Color.BLACK);
defaultRenderer.setApplyBackgroundColor(true);
// Adding a renderer for a slice
defaultRenderer.addSeriesRenderer(seriesRenderer);
}
defaultRenderer
.setChartTitle("Android version distribution as on December 1,
2014. ");
defaultRenderer.setChartTitleTextSize(20);
defaultRenderer.setZoomButtonsVisible(false);
LinearLayout chartContainer = (LinearLayout) findViewById(R.id.chart);
// remove any views before u paint the chart
chartContainer.removeAllViews();
// drawing pie chart
mChart = ChartFactory.getPieChartView(getBaseContext(),
distributionSeries, defaultRenderer);
// adding the view to the linearlayout
chartContainer.addView(mChart);
}
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