java - AChartEngine，点击获取图表值

Question

我使用 achartengine 编写了一个简单的时间图表。我想要做的是通过单击图表上的点来获取已经绘制的值，这可能吗？

Answer 1

假设 mChartView 是您的 GraphicalView:

mChartView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                  SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
                  double[] xy = mChartView.toRealPoint(0);

                  if (seriesSelection == null) {
                    Toast.makeText(GraficoMensile.this, "No chart element was clicked", Toast.LENGTH_SHORT)
                        .show();
                  } else {
                    Toast.makeText(
                            GraficoMensile.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();
                  }
                }
              }); 

来源: http://code.google.com/p/achartengine/source/browse/trunk/achartengine/demo/org/achartengine/chartdemo/demo/chart/XYChartBuilder.java