AChartEngine, GraphicalView OnClickListener not working

Question

I am new to android and use aChartEngine to create a histogram. I want to capture the x and y values ​​when the user clicks on the chart. I watched a demo from aChartEngine and created a good chart. However, onClickListner does not work when I click on the graphic. I defined a listener in the OnResume method, but it does not work. Any ideas are greatly appreciated. Did I miss something?

Here is my OnResume method, which is taken from XYChartBuilder

@Override protected void onResume() { super.onResume(); Toast.makeText(Clickable2.this, "In OnResume", Toast.LENGTH_SHORT).show(); if (mChartView == null) { Toast.makeText(Clickable2.this, "mChartView is null", Toast.LENGTH_SHORT).show(); LinearLayout layout = (LinearLayout) findViewById(R.id.chart); mChartView = ChartFactory.getBarChartView(this,mDatasetMethod(titles,x,values),renderer,Type.DEFAULT); renderer.setClickEnabled(true); renderer.setSelectableBuffer(100); //OnClickListener mChartView.setOnClickListener(new View.OnClickListener() { // @Override public void onClick(View v) { Toast.makeText(Clickable2.this, "ON CLICK", Toast.LENGTH_SHORT).show(); SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); double[] xy = mChartView.toRealPoint(0); if (seriesSelection == null) { Toast.makeText(Clickable2.this, "No chart element was clicked", Toast.LENGTH_SHORT) .show(); } else { Toast.makeText( Clickable2.this, "Chart element in series index " + seriesSelection.getSeriesIndex() + " data point index " + seriesSelection.getPointIndex() + " was clicked" + " closest point value X=" + seriesSelection.getXValue() + ", Y=" + seriesSelection.getValue() + " clicked point value X=" + (float) xy[0] + ", Y=" + (float) xy[1], Toast.LENGTH_SHORT).show(); } } }); //LongClickListener mChartView.setOnLongClickListener(new View.OnLongClickListener() { // @Override public boolean onLongClick(View v) { SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); Toast.makeText(Clickable2.this, "ON LONG CLICK", Toast.LENGTH_SHORT).show(); if (seriesSelection == null) { Toast.makeText(Clickable2.this, "No chart element was long pressed", Toast.LENGTH_SHORT); return false; // no chart element was long pressed, so let something // else handle the event } else { Toast.makeText(Clickable2.this, "Chart element in series index " + seriesSelection.getSeriesIndex() + " data point index " + seriesSelection.getPointIndex() + " was long pressed", Toast.LENGTH_SHORT); return true; // the element was long pressed - the event has been // handled } } }); mChartView.addZoomListener(new ZoomListener() { public void zoomApplied(ZoomEvent e) { String type = "out"; if (e.isZoomIn()) { type = "in"; } System.out.println("Zoom " + type + " rate " + e.getZoomRate()); } public void zoomReset() { System.out.println("Reset"); } }, true, true); mChartView.addPanListener(new PanListener() { public void panApplied() { System.out.println("New X range=[" + renderer.getXAxisMin() + ", " + renderer.getXAxisMax() + "], Y range=[" + renderer.getYAxisMax() + ", " + renderer.getYAxisMax() + "]"); } }); layout.addView(mChartView, new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT)); boolean enabled = mDataset.getSeriesCount() > 0; } else { mChartView.repaint(); Toast.makeText(Clickable2.this, "mChartView is NOT null", Toast.LENGTH_SHORT).show(); } } 

Answer 1

Can you check your code for some object definition like XYMultipleSeriesRenderer? Perhaps you forgot to set setClickEnabled to true ?!

Or maybe you should try:

 setOnTouchListener 

using the method:

 public boolean onTouch(View v, MotionEvent event) 

This works for me.

Answer 2

Change the parameter value of the setSelectableBuffer method to a larger number.