做Android开发经常会需要画一些图表，ECharts就是很好用的一款第三方的框架
1、配置ECharts
echarts.min.js文件就需要你自己去下载啦，可以直接选择：
echart.html:
<!DOCTYPE html>
<html style="height: 100%">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta charset="utf-8">
</head>
<body style="height: 100%; margin: 0">
<div id="container" style="height: 100%"></div>
<script type="text/javascript" src="./echarts.min.js"></script>
<script type="text/javascript">
var dom =document.getElementById("container");
var myChart =echarts.init(dom);
var app ={};
function loadEcharts(echartJson){
var option = JSON.parse(echartJson);
if (option &&typeof option ==="object") {
myChart.setOption(option,true);
}
}
</script>
</body>
</html>
2、添加依赖
implementation 'com.github.abel533:ECharts:3.0.0.2'
implementation 'com.google.code.gson:gson:2.8.6'
3、因为Echarts需要在WebView中显示，所以我们直接自定义一个EchartView继承自WebView用来显示图表。
public class EchartView extends WebView {
private static final String TAG = EchartView.class.getSimpleName();
public EchartView(Context context) {
this(context, null);
}
public EchartView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public EchartView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
WebSettings webSettings = getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setSupportZoom(false);
webSettings.setDisplayZoomControls(false);
loadUrl("file:///android_asset/echarts.html");
}
/**刷新图表
* java调用js的loadEcharts方法刷新echart
* 不能在第一时间就用此方法来显示图表，因为第一时间html的标签还未加载完成，不能获取到标签值
* @param option
*/
public void refreshEchartsWithOption(GsonOption option) {
if (option == null) {
return;
}
String optionString = option.toString();
String call = "javascript:loadEcharts('" + optionString + "')";
loadUrl(call);
}
}
4、EchartOptionUtil工具类，简单封装了折线圆柱饼状，更多图表的封装请参照EChart java 对象库和ECharts官方例子。
public class EchartOptionUtil {
//折线图
public static GsonOption getLineChartOptions(Object[] xAxis, Object[] yAxis, Object[] yAxis2) {
GsonOption option = new GsonOption();
option.title("折线图");
option.legend("销量");
option.legend("销量2");
option.tooltip().trigger(Trigger.axis);
ValueAxis valueAxis = new ValueAxis();
option.yAxis(valueAxis);
CategoryAxis categorxAxis = new CategoryAxis();
categorxAxis.axisLine().onZero(false);
categorxAxis.boundaryGap(true);
categorxAxis.data(xAxis);
option.xAxis(categorxAxis);
Line line = new Line();
line.smooth(false).name("销量").data(yAxis).itemStyle().normal().lineStyle().shadowColor("rgba(0,0,0,0.4)");
Line line1 = new Line();
line1.smooth(false).name("销量2").data(yAxis2).itemStyle().normal().lineStyle().shadowColor("rgba(6,6,6,0.4)");
option.series(line,line1);
return option;
}
public static GsonOption getBarChartOptions(Object[] xAxis, Object[] yAxis){
GsonOption option = new GsonOption();
option.title("柱状图");
option.legend("销量");
ValueAxis valueAxis = new ValueAxis();
option.yAxis(valueAxis);
CategoryAxis categorxAxis = new CategoryAxis();
categorxAxis.axisLine().onZero(false);
categorxAxis.boundaryGap(true);
categorxAxis.data(xAxis);
option.xAxis(categorxAxis);
Bar bar = new Bar();
bar.name("销量").data(yAxis).itemStyle().normal().setBarBorderColor("rgba(0,0,0,0.4)");
option.series(bar);
return option;
}
public static GsonOption getPieChartOptions(){
GsonOption option = new GsonOption();
option.title("圆饼图");
option.legend("陕西");
option.legend("陕西2");
option.legend("陕西3");
option.tooltip().trigger(Trigger.item);
Pie pie = new Pie();
HashMap hashMap = new HashMap();
hashMap.put("value",50);
hashMap.put("name","陕西");
HashMap hashMap1 = new HashMap();
hashMap1.put("value",30);
hashMap1.put("name","陕西2");
HashMap hashMap2 = new HashMap();
hashMap2.put("value",20);
hashMap2.put("name","陕西3");
pie.radius(60).data(hashMap,hashMap1,hashMap2);
option.series(pie);
return option;
}
}
5、activity_main布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<com.example.echartdemo.EchartView
android:id="@+id/lineChart"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="20dp"/>
<com.example.echartdemo.EchartView
android:id="@+id/barChart"
android:layout_width="match_parent"
android:layout_height="200dp"/>
<com.example.echartdemo.EchartView
android:id="@+id/pieChart"
android:layout_width="match_parent"
android:layout_height="300dp"/>
</LinearLayout>
6、MainActivity主页面使用
public class MainActivity extends AppCompatActivity {
private EchartView lineChart;
private EchartView barChart;
private EchartView pieChart;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
lineChart = findViewById(R.id.lineChart);
barChart = findViewById(R.id.barChart);
pieChart = findViewById(R.id.pieChart);
lineChart.setWebViewClient(new WebViewClient(){
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
//最好在h5页面加载完毕后再加载数据，防止html的标签还未加载完成，不能正常显示
refreshLineChart();
}
});
barChart.setWebViewClient(new WebViewClient(){
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
//最好在h5页面加载完毕后再加载数据，防止html的标签还未加载完成，不能正常显示
refreshBarChart();
}
});
pieChart.setWebViewClient(new WebViewClient(){
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
//最好在h5页面加载完毕后再加载数据，防止html的标签还未加载完成，不能正常显示
refreshPieChart();
}
});
}
private void refreshPieChart() {
pieChart.refreshEchartsWithOption(EchartOptionUtil.getPieChartOptions());
}
private void refreshBarChart() {
Object[] x = new Object[]{
"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
};
Object[] y = new Object[]{
820, 932, 901, 934, 1290, 1330, 1320
};
barChart.refreshEchartsWithOption(EchartOptionUtil.getBarChartOptions(x, y));
}
private void refreshLineChart() {
Object[] x = new Object[]{
"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
};
Object[] y = new Object[]{
820, 932, 901, 934, 1290, 1330, 1320
};
Object[] y2 = new Object[]{
420, 532, 601, 734, 890, 530, 1020
};
lineChart.refreshEchartsWithOption(EchartOptionUtil.getLineChartOptions(x, y,y2));
}
}