使用aChartengine折线图 [英] Line chart using aChartengine

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本文介绍了使用aChartengine折线图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想用折线图在我的应用程序,我想,我使用achart引擎来显示它在其中设置为背景图片为线性布局1,在第2线性布局我想补充线图下方的图片库。空指针异常在66行(layout.addView(mChartView,新的LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));),请帮助

 包com.android.linegraph;

    进口的java.util.ArrayList;
    进口的java.util.List;

    进口org.achartengine.ChartFactory;
    进口org.achartengine.GraphicalView;
    进口org.achartengine.chart.PointStyle;
    进口org.achartengine.model.XYMultipleSeriesDataset;
    进口org.achartengine.model.XYSeries;
    进口org.achartengine.renderer.XYMultipleSeriesRenderer;
    进口org.achartengine.renderer.XYSeriesRenderer;

    进口android.app.Activity;
    进口android.graphics.Color;
    进口android.graphics.Paint.Align;
    进口android.os.Bundle;
    进口android.util.Log;
    进口android.view.ViewGroup.LayoutParams;
    进口android.widget.LinearLayout;

    公共类LineGraph延伸活动{
        私人GraphicalView mChartView;

        XYMultipleSeriesRenderer渲染器;

        @覆盖
        保护无效的onCreate(包savedInstanceState){
            // TODO自动生成方法存根
            super.onCreate(savedInstanceState);

            的LinearLayout布局=(的LinearLayout)findViewById(R.id.linearLayout2);

            的String []标题=新的String [] {spens1};
            名单<加倍[]> X =新的ArrayList<加倍[]>();
            x.add(新双[] {1,2,3,4,5,6,7,8,9,10,11,12});
            //}
            名单<加倍[]>值=新的ArrayList<加倍[]>();
            值
                    。新增(新的双[] {9,10,11,15,19,23,26,25,22,18,13,
                            10});
            INT []颜色=新INT [] {Color.BLUE};
            PointStyle []风格=新PointStyle [] {PointStyle.CIRCLE};

            渲染= buildRenderer(颜色,款式);
            INT长度= renderer.getSeriesRendererCount();
            的for(int i = 0; I<长度;我++){
                ((XYSeriesRenderer)renderer.getSeriesRendererAt(I))
                        .setFillPoints(真正的);
            }
            setChartSettings(渲染器,记分卡VIEW,Attetempts
                    马克斯拿下,0.5%,12.5,-10,40,Color.LTGRAY,Color.LTGRAY);
            renderer.setXLabels(12);
            renderer.setYLabels(10);
            renderer.setShowGrid(真正的);
            renderer.setXLabelsAlign(Align.RIGHT);
            renderer.setYLabelsAlign(Align.RIGHT);
            renderer.setZoomButtonsVisible(真正的);
            renderer.setPanLimits(新的双[] {-​​10,20,-10,40});
            renderer.setZoomLimits(新的双[] {-​​10,20,-10,40});

            如果(mChartView == NULL){
                Log.d(OnCreate中,如果(mChartView == NULL));
                mChartView = ChartFactory.getLineChartView(这一点,mDataset(标题,
                        X,值),渲染器);
                layout.addView(mChartView,新的LayoutParams(
                        LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));

            } 其他 {
    // mChartView.repaint();
                Log.d(OnCreate中,如果(mChartView = NULL)!);
            }
        }

        私人无效setChartSettings(XYMultipleSeriesRenderer renderer3,
                标题字符串,字符串xTitle,字符串yTitle,双XMIN,
                双XMAX,双YMIN,双YMAX,INT axesColor,
                INT labelsColor){
            // TODO自动生成方法存根

            renderer3.setChartTitle(职称);
            renderer3.setXTitle(xTitle);
            renderer3.setYTitle(yTitle);
            renderer3.setXAxisMin(XMIN);
            renderer3.setXAxisMax(XMAX);
            renderer3.setYAxisMin(YMIN);
            renderer3.setYAxisMax(YMAX);
            renderer3.setAxesColor(axesColor);
            renderer3.setLabelsColor(labelsColor);

        }

        私人XYMultipleSeriesRenderer buildRenderer(INT []的颜色,
                PointStyle []样式){
            // TODO自动生成方法存根
            XYMultipleSeriesRenderer渲染器=新XYMultipleSeriesRenderer();
            setRenderer(渲染,颜色,款式);
            返回渲染器;
        }

        私人无效setRenderer(XYMultipleSeriesRenderer renderer2,INT []的颜色,
                PointStyle []样式){
            // TODO自动生成方法存根
            renderer2.setAxisTitleTextSize(16);
            renderer2.setChartTitleTextSize(20);
            renderer2.setLabelsTextSize(15);
            renderer2.setLegendTextSize(15);
            renderer2.setPointSize(5F);
            renderer2.setMargins(新INT [] {20,30,15,20});
            INT长度= colors.length;
            的for(int i = 0; I<长度;我++){
                XYSeriesRenderer R =新XYSeriesRenderer();
                r.setColor(颜色[I]);
                r.setPointStyle(样式[I]);
                renderer2.addSeriesRenderer(r)的;
            }
        }

        私人XYMultipleSeriesDataset mDataset(字符串[]冠军,
                名单<加倍[]> xValues​​,列表和LT;加倍[]> yValues​​){
            // TODO自动生成方法存根
            XYMultipleSeriesDataset为dataSet1 =新XYMultipleSeriesDataset();
            addXYSeries(为dataSet1,职称,xValues​​,yValues​​,0);
            返回为dataSet1;
        }

        私人无效addXYSeries(XYMultipleSeriesDataset数据集的String []冠军,
                名单<加倍[]> xValues​​,列表和LT;加倍[]> yValues​​,int标){
            // TODO自动生成方法存根

            INT长度= titles.length;
            的for(int i = 0; I<长度;我++){
                XYSeries系列=新XYSeries(标题[我],规模);
                双[] XV = xValues​​.get(我);
                双[] YV = yValues​​.get(我);
                INT seriesLength = xV.length;
                对于(INT K = 0; K< seriesLength; k ++){
                    series.add(XV [K],YV [K]);
                }
                dataset.addSeries(系列);
            }

        }

    }

< RelativeLayout的机器人:ID =@ + ID / relativeLayout1
    机器人:layout_width =FILL_PARENT机器人:layout_height =FILL_PARENT
    的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android>
    <的LinearLayout机器人:ID =@ + ID / linearLayout1
        机器人:背景=@可绘制/蟋蟀机器人:layout_alignParentLeft =真
        机器人:layout_height =WRAP_CONTENT机器人:layout_width =WRAP_CONTENT>< / LinearLayout中>

    <的LinearLayout机器人:ID =@ + ID / linearLayout2
        机器人:layout_below =@ ID / linearLayout1
        机器人:layout_alignParentLeft =真正的机器人:layout_height =WRAP_CONTENT
        机器人:layout_width =WRAP_CONTENT>< / LinearLayout中>
< / RelativeLayout的>
 

解决方案

我不能在实践中目前测试这一点,但我认为你缺少一个呼叫

 的setContentView(R.layout.NAME_OF_YOUR_XML_FILE);
 

这可能例如是该行之后:

  super.onCreate(savedInstanceState);
 

如果没有这个的布局变量为null,从而导致异常(我的猜测)。

I want to use line chart in my application, I want to show it in below the image which is setting as background image for linear layout 1, in 2nd linear layout i want to add line chart, I'm using achart engine libraries. Null pointer exception at line 66(layout.addView(mChartView, new LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));) please help

    package com.android.linegraph;

    import java.util.ArrayList;
    import java.util.List;

    import org.achartengine.ChartFactory;
    import org.achartengine.GraphicalView;
    import org.achartengine.chart.PointStyle;
    import org.achartengine.model.XYMultipleSeriesDataset;
    import org.achartengine.model.XYSeries;
    import org.achartengine.renderer.XYMultipleSeriesRenderer;
    import org.achartengine.renderer.XYSeriesRenderer;

    import android.app.Activity;
    import android.graphics.Color;
    import android.graphics.Paint.Align;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.ViewGroup.LayoutParams;
    import android.widget.LinearLayout;

    public class LineGraph extends Activity {
        private GraphicalView mChartView;

        XYMultipleSeriesRenderer renderer;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);

            LinearLayout layout = (LinearLayout) findViewById(R.id.linearLayout2);

            String[] titles = new String[] { "spens1" };
            List<double[]> x = new ArrayList<double[]>();
            x.add(new double[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 });
            // }
            List<double[]> values = new ArrayList<double[]>();
            values
                    .add(new double[] { 9, 10, 11, 15, 19, 23, 26, 25, 22, 18, 13,
                            10 });
            int[] colors = new int[] { Color.BLUE };
            PointStyle[] styles = new PointStyle[] { PointStyle.CIRCLE };

            renderer = buildRenderer(colors, styles);
            int length = renderer.getSeriesRendererCount();
            for (int i = 0; i < length; i++) {
                ((XYSeriesRenderer) renderer.getSeriesRendererAt(i))
                        .setFillPoints(true);
            }
            setChartSettings(renderer, "SCORE CARD VIEW", "Attetempts",
                    "Marks Scored", 0.5, 12.5, -10, 40, Color.LTGRAY, Color.LTGRAY);
            renderer.setXLabels(12);
            renderer.setYLabels(10);
            renderer.setShowGrid(true);
            renderer.setXLabelsAlign(Align.RIGHT);
            renderer.setYLabelsAlign(Align.RIGHT);
            renderer.setZoomButtonsVisible(true);
            renderer.setPanLimits(new double[] { -10, 20, -10, 40 });
            renderer.setZoomLimits(new double[] { -10, 20, -10, 40 });

            if (mChartView == null) {
                Log.d("Oncreate ", "if (mChartView == null)");
                mChartView = ChartFactory.getLineChartView(this, mDataset(titles,
                        x, values), renderer);
                layout.addView(mChartView, new LayoutParams(
                        LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

            } else {
    //          mChartView.repaint();
                Log.d("Oncreate ", "if (mChartView != null)");
            }
        }

        private void setChartSettings(XYMultipleSeriesRenderer renderer3,
                String title, String xTitle, String yTitle, double xMin,
                double xMax, double yMin, double yMax, int axesColor,
                int labelsColor) {
            // TODO Auto-generated method stub

            renderer3.setChartTitle(title);
            renderer3.setXTitle(xTitle);
            renderer3.setYTitle(yTitle);
            renderer3.setXAxisMin(xMin);
            renderer3.setXAxisMax(xMax);
            renderer3.setYAxisMin(yMin);
            renderer3.setYAxisMax(yMax);
            renderer3.setAxesColor(axesColor);
            renderer3.setLabelsColor(labelsColor);

        }

        private XYMultipleSeriesRenderer buildRenderer(int[] colors,
                PointStyle[] styles) {
            // TODO Auto-generated method stub
            XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
            setRenderer(renderer, colors, styles);
            return renderer;
        }

        private void setRenderer(XYMultipleSeriesRenderer renderer2, int[] colors,
                PointStyle[] styles) {
            // TODO Auto-generated method stub
            renderer2.setAxisTitleTextSize(16);
            renderer2.setChartTitleTextSize(20);
            renderer2.setLabelsTextSize(15);
            renderer2.setLegendTextSize(15);
            renderer2.setPointSize(5f);
            renderer2.setMargins(new int[] { 20, 30, 15, 20 });
            int length = colors.length;
            for (int i = 0; i < length; i++) {
                XYSeriesRenderer r = new XYSeriesRenderer();
                r.setColor(colors[i]);
                r.setPointStyle(styles[i]);
                renderer2.addSeriesRenderer(r);
            }
        }

        private XYMultipleSeriesDataset mDataset(String[] titles,
                List<double[]> xValues, List<double[]> yValues) {
            // TODO Auto-generated method stub
            XYMultipleSeriesDataset dataset1 = new XYMultipleSeriesDataset();
            addXYSeries(dataset1, titles, xValues, yValues, 0);
            return dataset1;
        }

        private void addXYSeries(XYMultipleSeriesDataset dataset, String[] titles,
                List<double[]> xValues, List<double[]> yValues, int scale) {
            // TODO Auto-generated method stub

            int length = titles.length;
            for (int i = 0; i < length; i++) {
                XYSeries series = new XYSeries(titles[i], scale);
                double[] xV = xValues.get(i);
                double[] yV = yValues.get(i);
                int seriesLength = xV.length;
                for (int k = 0; k < seriesLength; k++) {
                    series.add(xV[k], yV[k]);
                }
                dataset.addSeries(series);
            }

        }

    }

<RelativeLayout android:id="@+id/relativeLayout1"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <LinearLayout android:id="@+id/linearLayout1"
        android:background="@drawable/cricket" android:layout_alignParentLeft="true"
        android:layout_height="wrap_content" android:layout_width="wrap_content"></LinearLayout>

    <LinearLayout android:id="@+id/linearLayout2"
        android:layout_below="@id/linearLayout1"
        android:layout_alignParentLeft="true" android:layout_height="wrap_content"
        android:layout_width="wrap_content"></LinearLayout>
</RelativeLayout>

解决方案

I can't test this in practice now, but I think you are missing a call to

 setContentView(R.layout.NAME_OF_YOUR_XML_FILE);

this could e.g. be after this line:

 super.onCreate(savedInstanceState);

Without this the layout variable is null, thus causing the exception (my guess).

这篇关于使用aChartengine折线图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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