java将整数数组从一个类传递到另一个类

Question

我有两节课。我正试图根据数据库值绘制一个图表 但我无法将值从一个类发送到另一个类，因为使用了数组。请通读我的密码并帮我解决

下面是存在数组值的类（现在我使用的是静态值）

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.achartengine.chartdemo.demo.chart.IDemoChart;
import org.achartengine.chartdemo.demo.chart.TemperatureChart;
import 安卓.app.ListActivity;
import 安卓.content.Intent;
import 安卓.os.Bundle;
import 安卓.util.Log;
import 安卓.view.View;
import 安卓.widget.ListView;
import 安卓.widget.SimpleAdapter;

public class ChartDemo extends ListActivity {
    double a = 10;
    double pass[] = { 7, 0, 4, 8, 3, 5, 7, 6, 8, 19, 11, 4 };
    Intent intent;
    private IDemoChart[] mCharts = new IDemoChart[] { new TemperatureChart() };

    private String[] mMenuText;

    private String[] mMenuSummary;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        int length = mCharts.length;
        mMenuText = new String[length];
        mMenuSummary = new String[length];

        TemperatureChart obj=new TemperatureChart();
        obj.getArray(pass);
        for(int i=0;i<pass.length;i++)
        {
            Log.i("sanket",pass[i]+"");
        }

        for (int i = 0; i < length; i++) {
            mMenuText[i] = mCharts[i].getName();
            mMenuSummary[i] = mCharts[i].getDesc();
        }
        setListAdapter(new SimpleAdapter(this, getListValues(),
                安卓.R.layout.simple_list_item_2, new String[] {
                        IDemoChart.NAME, IDemoChart.DESC }, new int[] {
                        安卓.R.id.text1, 安卓.R.id.text2 }));
    }

    private List<Map<String, String>> getListValues() {
        List<Map<String, String>> values = new ArrayList<Map<String, String>>();
        int length = mMenuText.length;
        for (int i = 0; i < length; i++) {
            Map<String, String> v = new HashMap<String, String>();
            v.put(IDemoChart.NAME, mMenuText[i]);
            v.put(IDemoChart.DESC, mMenuSummary[i]);
            values.add(v);
        }
        return values;
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);

        // intent = new Intent(this, TemperatureChart.class);

        // if (position <= mCharts.length + 1) {

        intent = mCharts[position].execute(this);

        // intent.putExtra("sam", a);
        // Log.i("sanket",a+"");

        // }

        startActivity(intent);
    }
}

现在这是第二个类，我想要这些数组值 问题是这个类在填充数组中的那些项之前被初始化，所以这个类中的数组是空的

package org.achartengine.chartdemo.demo.chart;

import org.achartengine.ChartFactory;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.model.RangeCategorySeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer;

import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.graphics.Color;
import 安卓.graphics.Paint.Align;
import 安卓.util.Log;

/**
 * Temperature demo range chart.
 */
public class TemperatureChart implements IDemoChart {
    // static double b;

    double[] maxValues;

    public void getArray(double array1[]) {

        array1 = new double[12];
        this.maxValues = array1;

        for(int i=0;i<array1.length;i++)
        {
            Log.i("sanket",maxValues[i]+"");
        }
    }


    /**
     * Returns the chart name.
     * 
     * @return the chart name
     */
    public String getName() {
        return "MarkS range chart";
    }

    /**
     * Returns the chart description.
     * 
     * @return the chart description
     */
    public String getDesc() {
        return "The monthly Marks (vertical range chart)";
    }

    /**
     * Executes the chart demo.
     * 
     * @param context
     *            the context
     * @return the built intent
     */
    public Intent execute(Context context) {





        // b = getIntent().getIntExtra("sam", 0);
        // Log.i("sanket",b+"");
        double[] minValues = new double[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        // double[] maxValues = new double[] { 7, 0, 4, 8, 3, 5, 7, 6, 8, 19,
        // 11,
        // 4 };

        XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
        RangeCategorySeries series = new RangeCategorySeries("Marks");
        int length = minValues.length;
        for (int k = 0; k < length; k++) {
            series.add(minValues[k], maxValues[k]);
        }
        dataset.addSeries(series.toXYSeries());
        int[] colors = new int[] { Color.CYAN };
        XYMultipleSeriesRenderer renderer = buildBarRenderer(colors);
        setChartSettings(renderer, "Monthly Marks range", "Month",
                "Marks Obtained", 0.5, 12.5, 0, 20, Color.GRAY, Color.LTGRAY);
        renderer.setBarSpacing(0.5);
        renderer.setXLabels(0);
        renderer.setYLabels(10);
        renderer.addXTextLabel(1, "Jan");
        renderer.addXTextLabel(3, "Mar");
        renderer.addXTextLabel(5, "May");
        renderer.addXTextLabel(7, "Jul");
        renderer.addXTextLabel(10, "Oct");
        renderer.addXTextLabel(12, "Dec");
        renderer.addYTextLabel(5, "OK");
        renderer.addYTextLabel(10, "GOOD");
        renderer.addYTextLabel(20, "Nice");
        renderer.setMargins(new int[] { 30, 70, 10, 0 });
        renderer.setYLabelsAlign(Align.RIGHT);
        SimpleSeriesRenderer r = renderer.getSeriesRendererAt(0);
        r.setDisplayChartValues(true);
        r.setChartValuesTextSize(12);
        r.setChartValuesSpacing(3);
        r.setGradientEnabled(true);
        r.setGradientStart(-20, Color.BLUE);
        r.setGradientStop(20, Color.GREEN);
        return ChartFactory.getRangeBarChartIntent(context, dataset, renderer,
                Type.DEFAULT, "Marks Range");
    }

    protected void setChartSettings(XYMultipleSeriesRenderer renderer,
            String title, String xTitle, String yTitle, double xMin,
            double xMax, double yMin, double yMax, int axesColor,
            int labelsColor) {
        renderer.setChartTitle(title);
        renderer.setXTitle(xTitle);
        renderer.setYTitle(yTitle);
        renderer.setXAxisMin(xMin);
        renderer.setXAxisMax(xMax);
        renderer.setYAxisMin(yMin);
        renderer.setYAxisMax(yMax);
        renderer.setAxesColor(axesColor);
        renderer.setLabelsColor(labelsColor);
    }

    protected XYMultipleSeriesRenderer buildBarRenderer(int[] colors) {
        XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
        renderer.setAxisTitleTextSize(16);
        renderer.setChartTitleTextSize(20);
        renderer.setLabelsTextSize(15);
        renderer.setLegendTextSize(15);
        int length = colors.length;
        for (int i = 0; i < length; i++) {
            SimpleSeriesRenderer r = new SimpleSeriesRenderer();
            r.setColor(colors[i]);
            renderer.addSeriesRenderer(r);
        }
        return renderer;
    }
}

Answer 1

//Create a public class:
public class Values{

public static int[] val = null;

}


//Set array in one class:
Values.val = int[] arr1;//arr1 containing your values


//Get array in another class:
int[] arr2 = Values.val;

Answer 2

不知道你在这里做什么：

public void getArray(double array1[]) {

    array1 = new double[12];
    this.maxValues = array1;

    for(int i=0;i<array1.length;i++)
    {
        Log.i("sanket",maxValues[i]+"");
    }
}

您正在用新的double[12]覆盖输入参数array1，因此。最大值

Answer 3

你可以通过使用静态变量和方法来解决你的问题。将要共享的变量设为静态变量。还要在同一个类中编写静态方法来获得它。并从另一个类访问该方法。你可以看看这里的例子：-http://www.daniweb.com/software-development/java/threads/326941/passing-data-between-classes

Answer 4

如果将数组转换为int arraylist，然后在活动之间传递，然后在另一个活动中将其转换回数组，效果会更好