Android图表库MPAndroidChart(七)—饼状图可以再简单一点

    xiaoxiao2021-11-13  65

    Android图表库MPAndroidChart(七)—饼状图可以再简单一点


    接上文,今天实现的是用的很多的,作用在统计上的饼状图,我们看下今天的效果

    这个效果,我们实现,和之前一样的套路,我先来说下这个的应用场景,假设,我是一名小学老师,现在教务处让我设置一个图表,说明下我带的班级期末考试有多少人优秀,多少人及格和不及格等等,而这些呢,我已经算出来百分比了,只剩下画图了,那好,我们就来实现以下吧

    一.基本实现

    首先是我们的布局

    <com.github.mikephil.charting.charts.PieChart android:id="@+id/mPieChart" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"/>

    我们的饼状图是PieChart,然后进行初始化

    //饼状图 mPieChart = (PieChart) findViewById(R.id.mPieChart); mPieChart.setUsePercentValues(true); mPieChart.getDescription().setEnabled(false); mPieChart.setExtraOffsets(5, 10, 5, 5); mPieChart.setDragDecelerationFrictionCoef(0.95f); //设置中间文件 mPieChart.setCenterText(generateCenterSpannableText()); mPieChart.setDrawHoleEnabled(true); mPieChart.setHoleColor(Color.WHITE); mPieChart.setTransparentCircleColor(Color.WHITE); mPieChart.setTransparentCircleAlpha(110); mPieChart.setHoleRadius(58f); mPieChart.setTransparentCircleRadius(61f); mPieChart.setDrawCenterText(true); mPieChart.setRotationAngle(0); // 触摸旋转 mPieChart.setRotationEnabled(true); mPieChart.setHighlightPerTapEnabled(true); //变化监听 mPieChart.setOnChartValueSelectedListener(this);

    饼状图还是比较简单粗暴的,这里我们把数据写上去

    //模拟数据 ArrayList<PieEntry> entries = new ArrayList<PieEntry>(); entries.add(new PieEntry(40, "优秀")); entries.add(new PieEntry(20, "满分")); entries.add(new PieEntry(30, "及格")); entries.add(new PieEntry(10, "不及格")); //设置数据 setData(entries); mPieChart.animateY(1400, Easing.EasingOption.EaseInOutQuad); Legend l = mPieChart.getLegend(); l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP); l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT); l.setOrientation(Legend.LegendOrientation.VERTICAL); l.setDrawInside(false); l.setXEntrySpace(7f); l.setYEntrySpace(0f); l.setYOffset(0f); // 输入标签样式 mPieChart.setEntryLabelColor(Color.WHITE); mPieChart.setEntryLabelTextSize(12f);

    这里有一点要注意,他中间也是有文字的,当然,你也是可以关闭的,我们就不给他设置更多的属性了,大家有兴趣自己去实现下,我注释掉的部分

    //设置中间文字 private SpannableString generateCenterSpannableText() { //原文:MPAndroidChart\ndeveloped by Philipp Jahoda SpannableString s = new SpannableString("刘某人程序员\n我仿佛听到有人说我帅"); //s.setSpan(new RelativeSizeSpan(1.7f), 0, 14, 0); //s.setSpan(new StyleSpan(Typeface.NORMAL), 14, s.length() - 15, 0); // s.setSpan(new ForegroundColorSpan(Color.GRAY), 14, s.length() - 15, 0); //s.setSpan(new RelativeSizeSpan(.8f), 14, s.length() - 15, 0); // s.setSpan(new StyleSpan(Typeface.ITALIC), s.length() - 14, s.length(), 0); // s.setSpan(new ForegroundColorSpan(ColorTemplate.getHoloBlue()), s.length() - 14, s.length(), 0); return s; }

    关于设置数据,就是调用我们的setdata方法

    //设置数据 private void setData(ArrayList<PieEntry> entries) { PieDataSet dataSet = new PieDataSet(entries, "三年级一班"); dataSet.setSliceSpace(3f); dataSet.setSelectionShift(5f); //数据和颜色 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(dataSet); data.setValueFormatter(new PercentFormatter()); data.setValueTextSize(11f); data.setValueTextColor(Color.WHITE); mPieChart.setData(data); mPieChart.highlightValues(null); //刷新 mPieChart.invalidate(); }

    现在运行,就是实现的了,我们再来看下其他的效果

    二.显示百分比

    三.显示类型

    四.x轴动画

    五.y轴动画

    六.xy轴动画

    七.显示中间文字

    八.旋转动画

    这些细节都是一句话就能实现的,仔细看下嘛的代码

    activity_piechart.xml

    <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <com.github.mikephil.charting.charts.PieChart android:id="@+id/mPieChart" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/btn_show_percentage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示百分比"/> <Button android:id="@+id/btn_show_type" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="是否铺满"/> <Button android:id="@+id/btn_anim_x" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="X轴动画"/> <Button android:id="@+id/btn_anim_y" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Y轴动画"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/btn_anim_xy" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="XY轴动画"/> <Button android:id="@+id/btn_show_center_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示中间文字"/> <Button android:id="@+id/btn_save_pic" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="保存画廊"/> <Button android:id="@+id/btn_anim_rotating" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="旋转动画"/> </LinearLayout> </LinearLayout>

    PieChartActivity

    public class PieChartActivity extends BaseActivity implements OnChartValueSelectedListener, View.OnClickListener { private PieChart mPieChart; //显示百分比 private Button btn_show_percentage; //显示类型 private Button btn_show_type; //x轴动画 private Button btn_anim_x; //y轴动画 private Button btn_anim_y; //xy轴动画 private Button btn_anim_xy; //保存到sd卡 private Button btn_save_pic; //显示中间文字 private Button btn_show_center_text; //旋转动画 private Button btn_anim_rotating; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_piechart); initView(); } //初始化View private void initView() { btn_show_percentage = (Button) findViewById(R.id.btn_show_percentage); btn_show_percentage.setOnClickListener(this); btn_show_type = (Button) findViewById(R.id.btn_show_type); btn_show_type.setOnClickListener(this); btn_anim_x = (Button) findViewById(R.id.btn_anim_x); btn_anim_x.setOnClickListener(this); btn_anim_y = (Button) findViewById(R.id.btn_anim_y); btn_anim_y.setOnClickListener(this); btn_anim_xy = (Button) findViewById(R.id.btn_anim_xy); btn_anim_xy.setOnClickListener(this); btn_save_pic = (Button) findViewById(R.id.btn_save_pic); btn_save_pic.setOnClickListener(this); btn_show_center_text = (Button) findViewById(R.id.btn_show_center_text); btn_show_center_text.setOnClickListener(this); btn_anim_rotating = (Button) findViewById(R.id.btn_anim_rotating); btn_anim_rotating.setOnClickListener(this); //饼状图 mPieChart = (PieChart) findViewById(R.id.mPieChart); mPieChart.setUsePercentValues(true); mPieChart.getDescription().setEnabled(false); mPieChart.setExtraOffsets(5, 10, 5, 5); mPieChart.setDragDecelerationFrictionCoef(0.95f); //设置中间文件 mPieChart.setCenterText(generateCenterSpannableText()); mPieChart.setDrawHoleEnabled(true); mPieChart.setHoleColor(Color.WHITE); mPieChart.setTransparentCircleColor(Color.WHITE); mPieChart.setTransparentCircleAlpha(110); mPieChart.setHoleRadius(58f); mPieChart.setTransparentCircleRadius(61f); mPieChart.setDrawCenterText(true); mPieChart.setRotationAngle(0); // 触摸旋转 mPieChart.setRotationEnabled(true); mPieChart.setHighlightPerTapEnabled(true); //变化监听 mPieChart.setOnChartValueSelectedListener(this); //模拟数据 ArrayList<PieEntry> entries = new ArrayList<PieEntry>(); entries.add(new PieEntry(40, "优秀")); entries.add(new PieEntry(20, "满分")); entries.add(new PieEntry(30, "及格")); entries.add(new PieEntry(10, "不及格")); //设置数据 setData(entries); mPieChart.animateY(1400, Easing.EasingOption.EaseInOutQuad); Legend l = mPieChart.getLegend(); l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP); l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT); l.setOrientation(Legend.LegendOrientation.VERTICAL); l.setDrawInside(false); l.setXEntrySpace(7f); l.setYEntrySpace(0f); l.setYOffset(0f); // 输入标签样式 mPieChart.setEntryLabelColor(Color.WHITE); mPieChart.setEntryLabelTextSize(12f); } //设置中间文字 private SpannableString generateCenterSpannableText() { //原文:MPAndroidChart\ndeveloped by Philipp Jahoda SpannableString s = new SpannableString("刘某人程序员\n我仿佛听到有人说我帅"); //s.setSpan(new RelativeSizeSpan(1.7f), 0, 14, 0); //s.setSpan(new StyleSpan(Typeface.NORMAL), 14, s.length() - 15, 0); // s.setSpan(new ForegroundColorSpan(Color.GRAY), 14, s.length() - 15, 0); //s.setSpan(new RelativeSizeSpan(.8f), 14, s.length() - 15, 0); // s.setSpan(new StyleSpan(Typeface.ITALIC), s.length() - 14, s.length(), 0); // s.setSpan(new ForegroundColorSpan(ColorTemplate.getHoloBlue()), s.length() - 14, s.length(), 0); return s; } //设置数据 private void setData(ArrayList<PieEntry> entries) { PieDataSet dataSet = new PieDataSet(entries, "三年级一班"); dataSet.setSliceSpace(3f); dataSet.setSelectionShift(5f); //数据和颜色 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(dataSet); data.setValueFormatter(new PercentFormatter()); data.setValueTextSize(11f); data.setValueTextColor(Color.WHITE); mPieChart.setData(data); mPieChart.highlightValues(null); //刷新 mPieChart.invalidate(); } @Override public void onValueSelected(Entry e, Highlight h) { } @Override public void onNothingSelected() { } @Override public void onClick(View v) { switch (v.getId()) { //显示百分比 case R.id.btn_show_percentage: for (IDataSet<?> set : mPieChart.getData().getDataSets()) set.setDrawValues(!set.isDrawValuesEnabled()); mPieChart.invalidate(); break; //显示类型 case R.id.btn_show_type: if (mPieChart.isDrawHoleEnabled()) mPieChart.setDrawHoleEnabled(false); else mPieChart.setDrawHoleEnabled(true); mPieChart.invalidate(); break; //x轴动画 case R.id.btn_anim_x: mPieChart.animateX(1400); break; //y轴动画 case R.id.btn_anim_y: mPieChart.animateY(1400); break; //xy轴动画 case R.id.btn_anim_xy: mPieChart.animateXY(1400, 1400); break; //保存到sd卡 case R.id.btn_save_pic: mPieChart.saveToPath("title" + System.currentTimeMillis(), ""); break; //显示中间文字 case R.id.btn_show_center_text: if (mPieChart.isDrawCenterTextEnabled()) mPieChart.setDrawCenterText(false); else mPieChart.setDrawCenterText(true); mPieChart.invalidate(); break; //旋转动画 case R.id.btn_anim_rotating: mPieChart.spin(1000, mPieChart.getRotationAngle(), mPieChart.getRotationAngle() + 360, Easing.EasingOption .EaseInCubic); break; } } }

    是不是觉得很欢快呢?就是这样,我都有考虑是不是要二次封装一个MP了,因为基本的套路都是一模一样的,好了,接下来,我们最后看下运行效果

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