Android图表库MPAndroidChart——神神秘秘的散点图 _散点图

亦余心之所善兮，虽九死其犹未悔。这篇文章主要讲述Android图表库MPAndroidChart——神神秘秘的散点图相关的知识，希望能为你提供帮助。
android图表库MPAndroidChart(九)——神神秘秘的散点图

今天所的散点图可能用的人不多，但是也算是图表界的一股清流，我们来看下实际的效果

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添加的数据有点少，但是足以表示散点图了，我们先实现它

一.基本实现

实现还是老套路，看下布局

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

散点图的View是ScatterChart，我们看下初始化

//散点图 mScatterChart = (ScatterChart) findViewById(R.id.mScatterChart); mScatterChart.getDescription().setEnabled(false); mScatterChart.setOnChartValueSelectedListener(this); mScatterChart.setDrawGridBackground(false); mScatterChart.setTouchEnabled(true); mScatterChart.setMaxHighlightDistance(10f); // 支持缩放和拖动 mScatterChart.setDragEnabled(true); mScatterChart.setScaleEnabled(true); mScatterChart.setMaxVisibleValueCount(10); mScatterChart.setPinchZoom(true); Legend l = mScatterChart.getLegend(); l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP); l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT); l.setOrientation(Legend.LegendOrientation.VERTICAL); l.setDrawInside(false); l.setXOffset(5f); YAxis yl = mScatterChart.getAxisLeft(); yl.setAxisMinimum(0f); mScatterChart.getAxisRight().setEnabled(false); XAxis xl = mScatterChart.getXAxis(); xl.setDrawGridLines(false); setData();

可以明确一点的是，他的代码量是比较少的，说明简单啊，我们去理解就不是这么难了，我们模拟一些数据

//设置数据 private void setData() { ArrayList< Entry> yVals1 = new ArrayList< Entry> (); ArrayList< Entry> yVals2 = new ArrayList< Entry> (); ArrayList< Entry> yVals3 = new ArrayList< Entry> (); for (int i = 0; i < 10; i+ + ) { float val = (float) (Math.random() * 10 + 3); yVals1.add(new Entry(i, val)); }for (int i = 0; i < 10; i+ + ) { float val = (float) (Math.random() * 10 + 3); yVals2.add(new Entry(i + 0.33f, val)); }for (int i = 0; i < 10; i+ + ) { float val = (float) (Math.random() * 10 + 3); yVals3.add(new Entry(i + 0.66f, val)); }//创建一个数据集,并给它一个类型 ScatterDataSet set1 = new ScatterDataSet(yVals1, " 优秀" ); set1.setScatterShape(ScatterChart.ScatterShape.SQUARE); //设置颜色 set1.setColor(ColorTemplate.COLORFUL_COLORS[0]); ScatterDataSet set2 = new ScatterDataSet(yVals2, " 及格" ); set2.setScatterShape(ScatterChart.ScatterShape.CIRCLE); set2.setScatterShapeHoleColor(ColorTemplate.COLORFUL_COLORS[3]); set2.setScatterShapeHoleRadius(3f); set2.setColor(ColorTemplate.COLORFUL_COLORS[1]); ScatterDataSet set3 = new ScatterDataSet(yVals3, " 不及格" ); set3.setShapeRenderer(new CustomScatterShapeRenderer()); set3.setColor(ColorTemplate.COLORFUL_COLORS[2]); set1.setScatterShapeSize(8f); set2.setScatterShapeSize(8f); set3.setScatterShapeSize(8f); ArrayList< IScatterDataSet> dataSets = new ArrayList< IScatterDataSet> (); dataSets.add(set1); dataSets.add(set2); dataSets.add(set3); //创建一个数据集的数据对象 ScatterData data = new ScatterData(dataSets); mScatterChart.setData(data); mScatterChart.invalidate(); }

这样就实现完成了，也就是上面的那幅图片的效果了

二.x轴动画

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三.y轴动画

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四.xy轴动画

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【Android图表库MPAndroidChart——神神秘秘的散点图】可以看到，他的扩展也是比较少的，我们看一下完整的代码

activity_scatter.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.ScatterChart android:id= " @ + id/mScatterChart" 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_values" android:layout_width= " wrap_content" android:layout_height= " wrap_content" android:text= " 顶点显示值" /> < 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" /> < Button android:id= " @ + id/btn_anim_xy" android:layout_width= " wrap_content" android:layout_height= " wrap_content" android:text= " XY轴动画" /> < /LinearLayout> < LinearLayout android:layout_width= " match_parent" android:layout_height= " wrap_content" android:orientation= " horizontal" > < Button android:id= " @ + id/btn_save_pic" android:layout_width= " wrap_content" android:layout_height= " wrap_content" android:text= " 保存到相册" /> < Button android:id= " @ + id/btn_auto_mix_max" android:layout_width= " wrap_content" android:layout_height= " wrap_content" android:text= " 自动最大最小值" /> < Button android:id= " @ + id/btn_actionToggleHighlight" android:layout_width= " wrap_content" android:layout_height= " wrap_content" android:text= " 高亮显示" /> < /LinearLayout> < /LinearLayout>

ScatterChartActivity

public class ScatterChartActivity extends BaseActivity implements OnChartValueSelectedListener, View.OnClickListener {private ScatterChart mScatterChart; //显示顶点值 private Button btn_show_values; //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; //切换自动最大最小值 private Button btn_auto_mix_max; //高亮显示 private Button btn_actionToggleHighlight; @ Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_scatter); initView(); }//初始化View private void initView() {//基本控件 btn_show_values = (Button) findViewById(R.id.btn_show_values); btn_show_values.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_auto_mix_max = (Button) findViewById(R.id.btn_auto_mix_max); btn_auto_mix_max.setOnClickListener(this); btn_actionToggleHighlight = (Button) findViewById(R.id.btn_actionToggleHighlight); btn_actionToggleHighlight.setOnClickListener(this); //散点图 mScatterChart = (ScatterChart) findViewById(R.id.mScatterChart); mScatterChart.getDescription().setEnabled(false); mScatterChart.setOnChartValueSelectedListener(this); mScatterChart.setDrawGridBackground(false); mScatterChart.setTouchEnabled(true); mScatterChart.setMaxHighlightDistance(10f); // 支持缩放和拖动 mScatterChart.setDragEnabled(true); mScatterChart.setScaleEnabled(true); mScatterChart.setMaxVisibleValueCount(10); mScatterChart.setPinchZoom(true); Legend l = mScatterChart.getLegend(); l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP); l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT); l.setOrientation(Legend.LegendOrientation.VERTICAL); l.setDrawInside(false); l.setXOffset(5f); YAxis yl = mScatterChart.getAxisLeft(); yl.setAxisMinimum(0f); mScatterChart.getAxisRight().setEnabled(false); XAxis xl = mScatterChart.getXAxis(); xl.setDrawGridLines(false); setData(); }//设置数据 private void setData() { ArrayList< Entry> yVals1 = new ArrayList< Entry> (); ArrayList< Entry> yVals2 = new ArrayList< Entry> (); ArrayList< Entry> yVals3 = new ArrayList< Entry> (); for (int i = 0; i < 10; i+ + ) { float val = (float) (Math.random() * 10 + 3); yVals1.add(new Entry(i, val)); }for (int i = 0; i < 10; i+ + ) { float val = (float) (Math.random() * 10 + 3); yVals2.add(new Entry(i + 0.33f, val)); }for (int i = 0; i < 10; i+ + ) { float val = (float) (Math.random() * 10 + 3); yVals3.add(new Entry(i + 0.66f, val)); }//创建一个数据集,并给它一个类型 ScatterDataSet set1 = new ScatterDataSet(yVals1, " 优秀" ); set1.setScatterShape(ScatterChart.ScatterShape.SQUARE); //设置颜色 set1.setColor(ColorTemplate.COLORFUL_COLORS[0]); ScatterDataSet set2 = new ScatterDataSet(yVals2, " 及格" ); set2.setScatterShape(ScatterChart.ScatterShape.CIRCLE); set2.setScatterShapeHoleColor(ColorTemplate.COLORFUL_COLORS[3]); set2.setScatterShapeHoleRadius(3f); set2.setColor(ColorTemplate.COLORFUL_COLORS[1]); ScatterDataSet set3 = new ScatterDataSet(yVals3, " 不及格" ); set3.setShapeRenderer(new CustomScatterShapeRenderer()); set3.setColor(ColorTemplate.COLORFUL_COLORS[2]); set1.setScatterShapeSize(8f); set2.setScatterShapeSize(8f); set3.setScatterShapeSize(8f); ArrayList< IScatterDataSet> dataSets = new ArrayList< IScatterDataSet> (); dataSets.add(set1); dataSets.add(set2); dataSets.add(set3); //创建一个数据集的数据对象 ScatterData data = new ScatterData(dataSets); mScatterChart.setData(data); mScatterChart.invalidate(); }@ Override public void onValueSelected(Entry e, Highlight h) {}@ Override public void onNothingSelected() {}@ Override public void onClick(View v) { switch (v.getId()) { //显示顶点值 case R.id.btn_show_values: for (IDataSet set : mScatterChart.getData().getDataSets()) set.setDrawValues(!set.isDrawValuesEnabled()); mScatterChart.invalidate(); break; //x轴动画 case R.id.btn_anim_x: mScatterChart.animateX(3000); break; //y轴动画 case R.id.btn_anim_y: mScatterChart.animateY(3000); break; //xy轴动画 case R.id.btn_anim_xy: mScatterChart.animateXY(3000, 3000); break; //保存到sd卡 case R.id.btn_save_pic: if (mScatterChart.saveToGallery(" title" + System.currentTimeMillis(), 50)) { Toast.makeText(getApplicationContext(), " 保存成功" , Toast.LENGTH_SHORT).show(); } else Toast.makeText(getApplicationContext(), " 保存失败" , Toast.LENGTH_SHORT).show(); break; //切换自动最大最小值 case R.id.btn_auto_mix_max: mScatterChart.setAutoScaleMinMaxEnabled(!mScatterChart.isAutoScaleMinMaxEnabled()); mScatterChart.notifyDataSetChanged(); break; //高亮显示 case R.id.btn_actionToggleHighlight: if (mScatterChart.getData() != null) { mScatterChart.getData().setHighlightEnabled( !mScatterChart.getData().isHighlightEnabled()); mScatterChart.invalidate(); } break; } } }

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