Question

在MPAndroid图表库中，如何在条形图中的x轴或y轴项目中单击每个项目？

例如：如果条形图的x轴为条形图的1,2,3,4,5,6,7和y轴，则为100,200,300,400,500,600,700

如果单击1或100，则应打开一个活动，如果点击2或200，它应该打开另一个活动，依此类推..

MainActivity.java

 public class MainActivity extends AppCompatActivity implements OnChartValueSelectedListener {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            BarChart barChart = (BarChart) findViewById(R.id.chart);

    barChart.setHighlightPerTapEnabled(false);


            barChart.setDescription("");
            // set xaxis at bottom
            barChart.getXAxis().setPosition(XAxis.XAxisPosition.BOTTOM);
            // set xaxis
            barChart.getXAxis().setGridColor(Color.rgb(255,255,255));
            // set x axis text color
            barChart.getXAxis().setTextColor(Color.argb(42,44,44,44));
           // HorizontalBarChart barChart= (HorizontalBarChart) findViewById(R.id.chart);

            barChart.getAxisRight().setEnabled(false);
            barChart.setScaleEnabled(false);

            barChart.getLegend().setEnabled(false);
            barChart.setTouchEnabled(true);
            barChart.setDragEnabled(false);
            barChart.setScaleEnabled(false);
            barChart.setScaleXEnabled(false);
            barChart.setScaleYEnabled(false);
            barChart.setPinchZoom(false);
            barChart.setHighlightPerDragEnabled(false);
            barChart.setHighlightPerTapEnabled(false);
            barChart.setDrawGridBackground(false);
            barChart.setGridBackgroundColor(Color.rgb(255,255,255));
            barChart.getXAxis().setGridColor(Color.rgb(255,255,255));
            ArrayList<BarEntry> entries = new ArrayList<>();
            entries.add(new BarEntry(100, 0));
            entries.add(new BarEntry(200, 1));
            entries.add(new BarEntry(300, 2));
            entries.add(new BarEntry(400, 3));
            entries.add(new BarEntry(500, 4));
            entries.add(new BarEntry(600, 5));
            entries.add(new BarEntry(700, 6));
            barChart.setOnChartValueSelectedListener(this);

            BarDataSet dataset = new BarDataSet(entries, "# of Calls");

            ArrayList<String> labels = new ArrayList<String>();
            labels.add("1");
            labels.add("2");
            labels.add("3");
            labels.add("4");
            labels.add("5");
            labels.add("6");
            labels.add("7");




            BarData data = new BarData(labels, dataset);
            dataset.setColor(Color.rgb(33,200,215));

            barChart.setData(data);
            barChart.animateY(5000);

        }

        @Override
        public void onValueSelected(Entry e, int dataSetIndex, Highlight h) {

                Intent i = new Intent(MainActivity.this, Second.class);
                startActivity(i);

        }

        @Override
        public void onNothingSelected() {

        }
    }

Answer 1

The answer should be like this (for an older version of MPAndroidChart):

By e.getXIndex(); we can find x-Axis index then put condition on it. Every individual item click goes to different activity.

@Override
public void onValueSelected(Entry e, int dataSetIndex, Highlight h) {
    int x = e.getXIndex(); 

    if (x == 0) {
        Intent j = new Intent(MainActivity.this, Second.class);
        startActivity(j);
    }
    else if (x==1) {
        Intent i= new Intent(MainActivity.this, Third.class);
        startActivity(i);
        }
    else if (x==2) {
        Intent k= new Intent(MainActivity.this, Fourth.class);
        startActivity(k);
    }
    else if (x==3) {
        Intent k1 = new Intent(MainActivity.this, Fifth.class);
        startActivity(k1);
    }
    else if (x==4) {
        Intent k2 = new Intent(MainActivity.this, Sixth.class);
        startActivity(k2);
    }
    else if (x==5) {
        Intent k3 = new Intent(MainActivity.this, Seventh.class);
        startActivity(k3);
    }
    else if (x==6) {
        Intent k4 = new Intent(MainActivity.this, Eight.class);
        startActivity(k4);
    }
}

Answer 2

请花一些时间阅读MPAndroidChart的wiki和javadoc以了解基本概念。请记住，您可以在PC上使用 Ctr-Q 或在Mac上使用 Cmd-J 来获取Android Studio中光标所在类的工具提示。

MPAndroidChart 3.0.2中的解决方案如下所示：

    @Override
    public void onValueSelected(Entry e, Highlight h) {
        float x = e.getX(); //get the x value
        int roundedX = (int) Math.round(x); //round it to an integer
        Intent nextActivity;
        if (roundedX == 1) {
            nextActivity = new Intent(MainActivity.this, FirstActivity.class);
            startActivity(nextActivity);
        }
    }

更智能的解决方案是将类对象存储在数组或列表中而不是使用条件，但最好先尝试简单。请花更多时间学习Java和Android的基本概念，否则你会发现很难取得进展。

如何使用MPAndroid图表库在条形图中的x轴或y轴项目上单击每个项目打开不同的活动？

2 个答案: