MPAndroidChart:图表不显示 [英] MPAndroidChart: Chart Not Displaying

问题描述

我在我的项目XML中添加了一个BarChart(下面的布局片段):

I added a BarChart into my project XML (snippet of layout below):

<RelativeLayout
    android:id="@+id/relative_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >

 <com.github.mikephil.charting.charts.BarChart
    android:id="@+id/chart"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<TextView
    android:id="@+id/stepsTitle_textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:textSize="28sp"
    android:layout_below="@+id/chart"
    android:text="STEPS TODAY"
    android:layout_marginTop="8dp" />

然后我在onCreate()方法中向图表添加了数据:

And I added data to chart in my onCreate() method:

    chart = (BarChart) findViewById(R.id.chart);
    chart.setLogEnabled(true);

    chart.setDrawBarShadow(false);
    chart.setDrawValueAboveBar(true);

    chart.setDescription("");

    // if more than 60 entries are displayed in the chart, no values will be
    // drawn
     chart.setMaxVisibleValueCount(60);

    List<String> usernamesArray = new ArrayList<String>();
    //ArrayList<Long> stepsArray = new ArrayList<Long>();
    List<BarEntry> entryArray = new ArrayList<BarEntry>();

    usernamesArray.add("a");
    usernamesArray.add("b");
    usernamesArray.add("c");

    BarEntry entry1 = new BarEntry(500, 0);
    BarEntry entry2 = new BarEntry(500, 1);
    BarEntry entry3 = new BarEntry(500, 2);
    entryArray.add(entry1);
    entryArray.add(entry2);
    entryArray.add(entry3);

    BarDataSet dataSet = new BarDataSet(entryArray, "Steps");
    dataSet.setColor(Color.rgb(104, 241, 175));
    BarData data = new BarData(usernamesArray, dataSet);
    //graphRow.addView(chart);
    //leaderboard_tableLayout.addView(graphRow);
    //chart = new BarChart(this);
    chart.setData(data);
    chart.fitScreen();
    chart.setBackgroundColor(Color.WHITE);
    chart.invalidate();

但是，图表对象未显示；实际上，我在图表应有的位置根本看不到任何东西.

However, the chart object is not displaying; in fact, I do not see anything at all in the place where the chart should be.

对我可能会缺少的东西有什么想法吗?如有必要，我当然可以提供更多详细信息.

Any thoughts on what I may be missing? I can certainly provide more details if necessary.

谢谢！

推荐答案

因此，结果证明宽度和高度都设置为0，因此我将它们都从"match_parent"更改为以dp为单位的显式设置( 400dp和200dp)分别解决了该问题.

So it turns out that the width and height were being set to 0, so I changed them both from "match_parent" to an explicit setting in units of dp's (400dp and 200dp, respecitively), and that resolved the problem.

这篇关于MPAndroidChart:图表不显示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！