MPAndroidChart时间图表x轴未显示所有值

Question

我正在开发一个应用程序，其中我使用了MPAndroidChart。它显示特定月份的特定值。数据如下：

1430418600000, 130.279999\n1433097000000, 125.43\n1435689000000, 121.300003\n1438540200000, 112.760002\n1441045800000, 110.300003\n1443637800000, 119.50\n1446402600000, 118.300003\n1448908200000, 105.260002\n1451845800000, 97.339996\n1454265000000, 96.690002\n1456770600000, 108.989998\n1459449000000, 93.739998\n1462127400000, 99.860001\n1464719400000, 95.599998\n1467311400000, 104.209999\n1469989800000, 106.099998\n1472668200000, 113.050003\n1475433000000, 113.540001\n1477938600000, 110.519997\n1480530600000, 115.82\n1483381800000, 121.349998\n1485887400000, 136.990005\n1488306600000, 143.660004\n1491157800000, 143.649994

现在，Y轴显示了所提供的最大和最小点，而x轴仅显示了6个点。

图表初始化代码：

Cursor cursor = getContentResolver().query(Contract.Quote.makeUriForStock(quote_symbol),
            Contract.Quote.QUOTE_COLUMNS.toArray(new String[]{}),
            null, null, Contract.Quote.COLUMN_SYMBOL);

if(cursor!=null)
{
    cursor.moveToNext();
}
chart = (LineChart) findViewById(R.id.chart);

// no description text
chart.getDescription().setEnabled(false);

// enable touch gestures
chart.setTouchEnabled(true);

chart.setDragDecelerationFrictionCoef(0.9f);

// enable scaling and dragging
chart.setDragEnabled(true);
chart.setScaleEnabled(false);
chart.setDrawGridBackground(false);
chart.setHighlightPerDragEnabled(true);

// set an alternative background color
chart.setBackgroundColor(Color.WHITE);
chart.setViewPortOffsets(0f, 0f, 0f, 0f);
chart.setScaleXEnabled(true);

;
// set data
chart.setData(prepareLineData(cursor));

// do not forget to refresh the chart
chart.invalidate();
chart.animateX(750);

准备图表数据：

private LineData prepareLineData(Cursor cursor)
{
    String historyData=cursor.getString(cursor.getColumnIndex(Contract.Quote.COLUMN_HISTORY));
    String maxValueString=cursor.getString(cursor.getColumnIndex(Contract.Quote.COLUMN_HISTORY_MAX_VALUE));
    String maxDateString=cursor.getString(cursor.getColumnIndex(Contract.Quote.COLUMN_HISTORY_MAX_DATE));
    String minValueString=cursor.getString(cursor.getColumnIndex(Contract.Quote.COLUMN_HISTORY_MIN_VALUE));
    String minDateString=cursor.getString(cursor.getColumnIndex(Contract.Quote.COLUMN_HISTORY_MIN_DATE));

    String[] historyDataArray=historyData.split("\n");
    ArrayList<Entry> e1 = new ArrayList<>();

    for (int i = 0; i < historyDataArray.length; i++) {
        String[] historyDataValues=historyDataArray[i].split(",");
        e1.add(new Entry(Float.parseFloat(historyDataValues[0]), Float.parseFloat(historyDataValues[1])));
    }

    Typeface mTf = Typeface.createFromAsset(this.getAssets(), "OpenSans-Regular.ttf");


    XAxis xAxis = chart.getXAxis();
    xAxis.setPosition(XAxis.XAxisPosition.BOTTOM_INSIDE);
    xAxis.setTypeface(mTf);
    xAxis.setTextSize(10f);
    xAxis.setTextColor(Color.WHITE);
    xAxis.setDrawAxisLine(false);
    xAxis.setDrawGridLines(true);
    xAxis.setTextColor(Color.rgb(255, 192, 56));
    xAxis.setCenterAxisLabels(true);
    xAxis.setAxisMaximum(Float.parseFloat(maxDateString));
    xAxis.setAxisMinimum(Float.parseFloat(minDateString));
    xAxis.setAvoidFirstLastClipping(true);
    xAxis.setValueFormatter(new IAxisValueFormatter() {
        private SimpleDateFormat mFormat = new SimpleDateFormat("MMM,yy");
        @Override
        public String getFormattedValue(float value, AxisBase axis) {
            return mFormat.format(new Date((long) value));
        }
    });
    YAxis leftAxis = chart.getAxisLeft();
    leftAxis.setPosition(YAxis.YAxisLabelPosition.INSIDE_CHART);
    leftAxis.setTypeface(mTf);
    leftAxis.setTextColor(ColorTemplate.getHoloBlue());
    leftAxis.setDrawGridLines(false);
    leftAxis.setGranularityEnabled(true);
    leftAxis.setAxisMinimum(0f);
    leftAxis.setAxisMaximum(Float.parseFloat(maxValueString)); 
    leftAxis.setTextColor(Color.rgb(255, 192, 56));
    YAxis rightAxis = chart.getAxisRight();
    rightAxis.setEnabled(false);
    LineDataSet d1 = new LineDataSet(e1, "Price");
    d1.setLineWidth(2.5f);
    d1.setAxisDependency(YAxis.AxisDependency.LEFT);
    d1.setHighLightColor(Color.rgb(244, 117, 117));
    d1.setDrawValues(false);
    ArrayList<ILineDataSet> sets = new ArrayList<>();
    sets.add(d1);
    return new LineData(sets);
}

Answer 1

MPAndroidChart计算要自动显示的标签。

如果要在特定位置显示标签，可以使用库的修改版本。

请参见下面的示例：

leftAxis.setShowSpecificLabelPositions(true);
leftAxis.setSpecificLabelPositions(new float[]{0, 10, 20, 50, 100, 300});

您可以在这里下载库：https://github.com/philippeauriach/MPAndroidChart/tree/custom-labels