Android-饼图 [英] Android - Pie Chart

问题描述

为什么我的图表饼形图是如此之小.我使用的库是mpandroidchartlibrary-2-1-2.jar，并且我具有activity_main.xml android:id ="@ + id/mainLayout".任何人都知道问题可能出在哪里吗?

Why my diagram pie chart is so small. I use the library mpandroidchartlibrary-2-1-2.jar and I have activity_main.xml android:id="@+id/mainLayout". Anyone have any idea what the problem can be?

public class MainActivity extends Activity{

private RelativeLayout mainLayout;
private PieChart mChart;


DatabaseHelper datahelper = new DatabaseHelper(this);

 private float[] yData = {5, 10, 15, 30, 40};
 private String[] xData = { "Sony", "Huawei", "LG", "Apple", "Samsung"};




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


    mainLayout = (RelativeLayout)findViewById(R.id.mainLayout);
    mChart = new PieChart(this);

    mainLayout.addView(mChart);
    mainLayout.setBackgroundColor(Color.LTGRAY);

    mChart.setUsePercentValues(true);
    mChart.setDescription("Smartphones Market Share");

    mChart.setDrawHoleEnabled(true);
    mChart.setHoleColorTransparent(true);
    mChart.setHoleRadius(7);
    mChart.setTransparentCircleRadius(10);

    mChart.setRotationAngle(0);
    mChart.setRotationEnabled(true);

    mChart.setOnChartValueSelectedListener(new OnChartValueSelectedListener() {

        @Override
        public void onValueSelected(Entry e, int dataSetIndex, Highlight h) {
            if (e == null)
                return;

            Toast.makeText(Main6Activity.this, xData[e.getXIndex()] + " = " + e.getVal() + "%", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onNothingSelected() {


        }


    });


    addData();
    Legend l = mChart.getLegend();
    l.setPosition(Legend.LegendPosition.RIGHT_OF_CHART);
    l.setXEntrySpace(7);
    l.setYEntrySpace(5);






}

private void addData()
{
    ArrayList<Entry> yVals1 = new ArrayList<Entry>();
    for (int i =0; i <yData.length; i++)

        yVals1.add(new Entry(yData[i],i));

    ArrayList<String> xVals = new ArrayList<String>();
    for (int i =0; i<xData.length; i++)
        xVals.add(xData[i]);

    PieDataSet dataSet = new PieDataSet(yVals1,"Market Share");
    dataSet.setSliceSpace(3);
    dataSet.setSelectionShift(5);

    ArrayList<Integer> colors = new ArrayList<Integer>();
    for (int c : ColorTemplate.VORDIPLOM_COLORS)
        colors.add(c);

    for (int c : ColorTemplate.JOYFUL_COLORS)
        colors.add(c);

    for (int c : ColorTemplate.COLORFUL_COLORS)
        colors.add(c);

    for (int c : ColorTemplate.LIBERTY_COLORS)
        colors.add(c);

    for (int c : ColorTemplate.PASTEL_COLORS)
        colors.add(c);

    colors.add(ColorTemplate.getHoloBlue());
    dataSet.setColors(colors);

    PieData data = new PieData(xVals,dataSet);
    data.setValueFormatter(new PercentFormatter());
    data.setValueTextSize(11f);
    data.setValueTextColor(Color.GRAY);

    mChart.setData(data);

    mChart.highlightValues(null);

    mChart.invalidate();


}}

推荐答案

我通过以下方式解决:

 ViewGroup.LayoutParams lp = barchart.getLayoutParams();
    lp.height=Extra.convertDpToPixel(yVals1.size()*150,this);
    barchart.setLayoutParams(lp);

之前 barchart.setData(data); barchart.groupBars(0, 0.03f, 0.03f); barchart.invalidate();

befor barchart.setData(data); barchart.groupBars(0, 0.03f, 0.03f); barchart.invalidate();

这篇关于Android-饼图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！