Android 优秀图标库MPAndroidChart之柱状图（适应百分之八十项目需求）
在项目当中很多时候要对数据进行分析就要用到图表，在gitHub上有很多优秀的图表开源库，今天给大家分享的就是MPAndroidChart中的柱状图。简单介绍一下MPAndroidChart：他可以实现图表的拖动，3D，局部查看，数据动态展示等功能。
官方源码地址：github.com/PhilJay/MPA…
废话就不多说了，先给看大家看看效果图
操作步骤第一步：需要将依赖的库添加到你的项目中第二步：xml中implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha'
implementation 'com.google.android.material:material:1.0.0'
<com.github.mikephil.charting.charts.BarChart android:id="@+id/chart1" android:layout_width="match_parent" android:layout_height="300dp" />第三步：ValueFormatter.java
/** * Class to format all values before they are drawn as labels. */ public abstract class ValueFormatter implements IAxisValueFormatter, IValueFormatter {/** * <b>DO NOT USE</b>, only for backwards compatibility and will be removed in future versions. * * @param value the value to be formatted * @param axis the axis the value belongs to * @return formatted string label */@Override@Deprecatedpublic String getFormattedValue(float value, AxisBase axis) { return getFormattedValue(value);}/** * <b>DO NOT USE</b>, only for backwards compatibility and will be removed in future versions. * @param value the value to be formatted * @param entry the entry the value belongs to - in e.g. BarChart, this is of class BarEntry * @param dataSetIndex the index of the DataSet the entry in focus belongs to * @param viewPortHandler provides information about the current chart state (scale, translation, ...) * @return formatted string label */@Override@Deprecatedpublic String getFormattedValue(float value, Entry entry, int dataSetIndex, ViewPortHandler viewPortHandler) { return getFormattedValue(value);}/** * Called when drawing any label, used to change numbers into formatted strings. * * @param value float to be formatted * @return formatted string label */public String getFormattedValue(float value) { return String.valueOf(value);}/** * Used to draw axis labels, calls {@link #getFormattedValue(float)} by default. * * @param value float to be formatted * @param axis axis being labeled * @return formatted string label */public String getAxisLabel(float value, AxisBase axis) { return getFormattedValue(value);}/** * Used to draw bar labels, calls {@link #getFormattedValue(float)} by default. * * @param barEntry bar being labeled * @return formatted string label */public String getBarLabel(BarEntry barEntry) { return getFormattedValue(barEntry.getY());}/** * Used to draw stacked bar labels, calls {@link #getFormattedValue(float)} by default. * * @param value current value to be formatted * @param stackedEntry stacked entry being labeled, contains all Y values * @return formatted string label */public String getBarStackedLabel(float value, BarEntry stackedEntry) { return getFormattedValue(value);}/** * Used to draw line and scatter labels, calls {@link #getFormattedValue(float)} by default. * * @param entry point being labeled, contains X value * @return formatted string label */public String getPointLabel(Entry entry) { return getFormattedValue(entry.getY());}/** * Used to draw pie value labels, calls {@link #getFormattedValue(float)} by default. * * @param value float to be formatted, may have been converted to percentage * @param pieEntry slice being labeled, contains original, non-percentage Y value * @return formatted string label */public String getPieLabel(float value, PieEntry pieEntry) { return getFormattedValue(value);}/** * Used to draw radar value labels, calls {@link #getFormattedValue(float)} by default. * * @param radarEntry entry being labeled * @return formatted string label */public String getRadarLabel(RadarEntry radarEntry) { return getFormattedValue(radarEntry.getY());}/** * Used to draw bubble size labels, calls {@link #getFormattedValue(float)} by default. * * @param bubbleEntry bubble being labeled, also contains X and Y values * @return formatted string label */public String getBubbleLabel(BubbleEntry bubbleEntry) { return getFormattedValue(bubbleEntry.getSize());}/** * Used to draw high labels, calls {@link #getFormattedValue(float)} by default. * * @param candleEntry candlestick being labeled * @return formatted string label */public String getCandleLabel(CandleEntry candleEntry) { return getFormattedValue(candleEntry.getHigh());}}第四步：MyValueFormatter
public class MyValueFormatter extends ValueFormatter{private final DecimalFormat mFormat;private String suffix;public MyValueFormatter(String suffix) { mFormat = new DecimalFormat("0000"); this.suffix = suffix;}@Overridepublic String getFormattedValue(float value) { return mFormat.format(value) + suffix;}@Overridepublic String getAxisLabel(float value, AxisBase axis) { if (axis instanceof XAxis) { return mFormat.format(value); } else if (value > 0) { return mFormat.format(value) + suffix; } else { return mFormat.format(value); }}}复制代码第五步：MainAcyivity
package detongs.hbqianze.him.linechart; import android.os.Bundle; import android.util.Log; import android.view.WindowManager; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import com.github.mikephil.charting.charts.BarChart; import com.github.mikephil.charting.components.XAxis; import com.github.mikephil.charting.components.YAxis; import com.github.mikephil.charting.data.BarData; import com.github.mikephil.charting.data.BarDataSet; import com.github.mikephil.charting.data.BarEntry; import com.github.mikephil.charting.interfaces.datasets.IBarDataSet; import com.github.mikephil.charting.interfaces.datasets.IDataSet; import com.github.mikephil.charting.utils.ColorTemplate; import java.util.ArrayList; import detongs.hbqianze.him.linechart.chart.MyValueFormatter; import detongs.hbqianze.him.linechart.chart.ValueFormatter; public class MainActivity extends AppCompatActivity {private BarChart chart;private TextView te_cache;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_main); chart = findViewById(R.id.chart1); te_cache = findViewById(R.id.te_cache); chart.getDescription().setEnabled(false); //设置最大值条目，超出之后不会有值 chart.setMaxVisibleValueCount(60); //分别在x轴和y轴上进行缩放 chart.setPinchZoom(true); //设置剩余统计图的阴影 chart.setDrawBarShadow(false); //设置网格布局 chart.setDrawGridBackground(true); //通过自定义一个x轴标签来实现2,015 有分割符符bug ValueFormatter custom = new MyValueFormatter(" "); //获取x轴线 XAxis xAxis = chart.getXAxis(); //设置x轴的显示位置 xAxis.setPosition(XAxis.XAxisPosition.BOTTOM); //设置网格布局 xAxis.setDrawGridLines(true); //图表将避免第一个和最后一个标签条目被减掉在图表或屏幕的边缘 xAxis.setAvoidFirstLastClipping(false); //绘制标签 指x轴上的对应数值 默认true xAxis.setDrawLabels(true); xAxis.setValueFormatter(custom); //缩放后x 轴数据重叠问题 xAxis.setGranularityEnabled(true); //获取右边y标签 YAxis axisRight = chart.getAxisRight(); axisRight.setStartAtZero(true); //获取左边y轴的标签 YAxis axisLeft = chart.getAxisLeft(); //设置Y轴数值 从零开始 axisLeft.setStartAtZero(true); chart.getAxisLeft().setDrawGridLines(false); //设置动画时间 chart.animateXY(600,600); chart.getLegend().setEnabled(true); getData(); //设置柱形统计图上的值 chart.getData().setValueTextSize(10); for (IDataSet set : chart.getData().getDataSets()){ set.setDrawValues(!set.isDrawValuesEnabled()); }}public void getData(){ArrayList<BarEntry> values = new ArrayList<>(); Float aFloat = Float.valueOf("2015"); Log.v("xue","aFloat+++++"+aFloat); BarEntry barEntry = new BarEntry(aFloat,Float.valueOf("100"));BarEntry barEntry1 = new BarEntry(Float.valueOf("2016"),Float.valueOf("210"));BarEntry barEntry2 = new BarEntry(Float.valueOf("2017"),Float.valueOf("300"));BarEntry barEntry3 = new BarEntry(Float.valueOf("2018"),Float.valueOf("450"));BarEntry barEntry4 = new BarEntry(Float.valueOf("2019"),Float.valueOf("300")); BarEntry barEntry5 = new BarEntry(Float.valueOf("2020"),Float.valueOf("650")); BarEntry barEntry6 = new BarEntry(Float.valueOf("2021"),Float.valueOf("740"));values.add(barEntry);values.add(barEntry1);values.add(barEntry2);values.add(barEntry3);values.add(barEntry4);values.add(barEntry5); values.add(barEntry6);BarDataSet set1;if (chart.getData() != null && chart.getData().getDataSetCount() > 0) { set1 = (BarDataSet) chart.getData().getDataSetByIndex(0); set1.setValues(values); chart.getData().notifyDataChanged(); chart.notifyDataSetChanged();} else { set1 = new BarDataSet(values, "点折水"); set1.setColors(ColorTemplate.VORDIPLOM_COLORS); set1.setDrawValues(false); ArrayList<IBarDataSet> dataSets = new ArrayList<>(); dataSets.add(set1); BarData data = new BarData(dataSets); chart.setData(data); chart.setFitBars(true);} //绘制图表chart.invalidate();}}最后
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