hellocharts-android 简单使用

这次介绍一个超级好用的图标库，hellocharts-android-master，大家先预览一下这个库的效果

github原链接HelloCharts-Android-master

这个库的动画及手势效果极佳，用户体验也很棒，但是！

他的坐标轴似乎不能定义。基本只能显示为固定的内容。

AxisValueFormatter接口只定义了两个int方法，根本没有给出String的写法，如果有哪位大神有办法能给出string的写法请留言，我先谢谢了。

public interface AxisValueFormatter {    /**     * Formats AxisValue for manual(custom) axis. Result is stored in (output) formattedValue array. Method     * returns number of chars of formatted value. The formatted value starts at index [formattedValue.length -     * charsNumber] and ends at index [formattedValue.length-1].     */    public int formatValueForManualAxis(char[] formattedValue, AxisValue axisValue);    /**     * Used only for auto-generated axes. If you are not going to use your implementation for aut-generated axes you can     * skip implementation of this method and just return 0. SFormats values with given number of digits after     * decimal separator. Result is stored in given array. Method returns number of chars for formatted value. The     * formatted value starts at index [formattedValue.length - charsNumber] and ends at index [formattedValue     * .length-1].     */    public int formatValueForAutoGeneratedAxis(char[] formattedValue, float value, int autoDecimalDigits);}

闲话少许，请看小小的demo，希望能给困惑绘图的小伙伴们些许灵感。

先上个小实例：

简单的折线图

package com.leo.test.activity;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import com.leo.test.R;import java.util.ArrayList;import java.util.List;import lecho.lib.hellocharts.model.Axis;import lecho.lib.hellocharts.model.Line;import lecho.lib.hellocharts.model.LineChartData;import lecho.lib.hellocharts.model.PointValue;import lecho.lib.hellocharts.model.ValueShape;import lecho.lib.hellocharts.model.Viewport;import lecho.lib.hellocharts.view.LineChartView;/** * @Function * @Author Leo * @CreateTime 2015/12/21 0021 */public class LineChartActivity extends AppCompatActivity {    private LineChartView line_chart_view;    private LineChartData data;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_line_chart);        line_chart_view = (LineChartView) findViewById(R.id.line_chart_view);<span style="white-space:pre"></span>        List<Line> lines = initLine();        data = initData(lines);        line_chart_view.setLineChartData(data);        Viewport viewport = initViewPort();        line_chart_view.setMaximumViewport(viewport);        line_chart_view.setCurrentViewport(viewport);    }    /**     * 设置4个边距     */    private Viewport initViewPort() {        Viewport viewport = new Viewport();        viewport.top = 100;        viewport.bottom = 0;        viewport.left = 0;        viewport.right = 90;        return viewport;    }    /**     * 初始化线属性     *     * @return     */    private List<Line> initLine() {        List<Line> lineList = new ArrayList<>();        List<PointValue> pointValueList = new ArrayList<>();        PointValue pointValue1 = new PointValue(10,30);        pointValueList.add(pointValue1);        PointValue pointValue2 = new PointValue(20,20);        pointValueList.add(pointValue2);        PointValue pointValue3 = new PointValue(30,70);        pointValueList.add(pointValue3);        PointValue pointValue4 = new PointValue(40,69);        pointValueList.add(pointValue4);        PointValue pointValue5 = new PointValue(50,64);        pointValueList.add(pointValue5);        PointValue pointValue6 = new PointValue(60,31);        pointValueList.add(pointValue6);        PointValue pointValue7 = new PointValue(70,22);        pointValueList.add(pointValue7);        PointValue pointValue8 = new PointValue(80,100);        pointValueList.add(pointValue8);        Line line = new Line(pointValueList);        line.setColor(getResources().getColor(R.color.colorAccent));        line.setShape(ValueShape.CIRCLE);        lineList.add(line);        return lineList;    }    /**     * 初始化数据     *     * @return     */    private LineChartData initData(List<Line> lines) {        LineChartData data = new LineChartData(lines);        //初始化轴        Axis axisX = new Axis();        Axis axisY = new Axis().setHasLines(true);        axisX.setName("时间");        //前加字符//        axisX.setFormatter(new SimpleAxisValueFormatter().setPrependedText("aaaa".toCharArray()));        //后加字符//        axisX.setFormatter(new SimpleAxisValueFormatter().setAppendedText("aaaa".toCharArray()));//        axisX.setFormatter(new SimpleAxisValueFormatter());        axisY.setName("销量");        //设置轴        data.setAxisYLeft(axisY);        data.setAxisXBottom(axisX);        //设置负值 设置为负无穷 默认为0//        data.setBaseValue(Float.NEGATIVE_INFINITY);        return data;    }}

下面是xml文件

<?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:padding="16dp"    android:orientation="vertical">    <lecho.lib.hellocharts.view.LineChartView        android:background="#123456"        android:id="@+id/line_chart_view"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

附上官方demo的CSDN下载地址，送给那些github上不去的童鞋官方demo