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如何在android中创建条形图？

注意： - 但我需要使用 Web 服务中的 x 轴和 y 轴值。 这意味着 Web 服务将显示 x 和 y 轴值。然后我需要使用这些值作为 x 和 y 轴值来创建条形图。

如何做到这一点？请提出建议。

LOGCAT

09-21 15:09:53.103: D/AndroidRuntime(271): Shutting down VM
09-21 15:09:53.103: W/dalvikvm(271): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-21 15:09:53.114: E/AndroidRuntime(271): FATAL EXCEPTION: main
09-21 15:09:53.114: E/AndroidRuntime(271): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.xmlparsing_test/com.example.xmlparsing_test.BarGraphActivity}: java.lang.NullPointerException
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.os.Looper.loop(Looper.java:123)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.ActivityThread.main(ActivityThread.java:4627)
09-21 15:09:53.114: E/AndroidRuntime(271):  at java.lang.reflect.Method.invokeNative(Native Method)
09-21 15:09:53.114: E/AndroidRuntime(271):  at java.lang.reflect.Method.invoke(Method.java:521)
09-21 15:09:53.114: E/AndroidRuntime(271):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-21 15:09:53.114: E/AndroidRuntime(271):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-21 15:09:53.114: E/AndroidRuntime(271):  at dalvik.system.NativeStart.main(Native Method)
09-21 15:09:53.114: E/AndroidRuntime(271): Caused by: java.lang.NullPointerException
09-21 15:09:53.114: E/AndroidRuntime(271):  at com.example.xmlparsing_test.BarGraphActivity.buildBarDataset(BarGraphActivity.java:115)
09-21 15:09:53.114: E/AndroidRuntime(271):  at com.example.xmlparsing_test.BarGraphActivity.DrawGraph(BarGraphActivity.java:57)
09-21 15:09:53.114: E/AndroidRuntime(271):  at com.example.xmlparsing_test.BarGraphActivity.onCreate(BarGraphActivity.java:22)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-21 15:09:53.114: E/AndroidRuntime(271):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
09-21 15:09:53.114: E/AndroidRuntime(271):  ... 11 more
09-21 15:10:04.033: I/Process(271): Sending signal. PID: 271 SIG: 9

图表.java

 public class Chart extends Activity 
 {      
    EditText edt1,edt2;
TextView txtv1;
Button btn;

   @Override
   public void onCreate(Bundle savedInstanceState) 
   {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    edt1 = (EditText)findViewById(R.id.editText1);
    edt2 = (EditText)findViewById(R.id.editText2);

    btn = (Button)findViewById(R.id.button1);
    btn.setOnClickListener(new View.OnClickListener()
    {

public void onClick(View v) 
{
    getTMSChart(edt1.getText().toString(),edt2.getText().toString());

    Intent intnt = new Intent(v.getContext(), BarGraphActivity.class);
            startActivity(intnt);
        }
    });
    }
public void getTMSChart(String FromDate, String ToDate) 
   {
    System.setProperty("http.keepAlive", "false");        
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);        

    envelope.dotNet = true;

    String METHOD = "GetTMSChart";
    String NAMESPACE = "http://tempuri.org/";
    String SOAP_ACTION = "http://tempuri.org/GetTMSChart"; 
    String URL = "http://54.251.60.177/TMSOrdersService/TMSDetails.asmx";

    SoapObject request = new SoapObject(NAMESPACE, METHOD); 

    request.addProperty("FromDate","");               
    request.addProperty("ToDate","");

    envelope.setOutputSoapObject(request);


    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

    try 
    {
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapObject result = (SoapObject) envelope.bodyIn;
        SoapObject root =  (SoapObject) ((SoapObject)(result).getProperty(0)).getProperty("NewDataSet");
        int tablesCount = root.getPropertyCount();

    for (int i = 0; i < tablesCount; i++)
    {
        SoapObject table = (SoapObject) root.getProperty(i);
        int propertyCount = table.getPropertyCount();

     for (int j = 0; j < propertyCount; j++)
     {           
        //String ord = table.getPropertyAsString("");

         int orderNo = Integer.parseInt(table.getPropertyAsString("Order_No"));
         int freightRate = Integer.parseInt(table.getPropertyAsString("Freight_Rate"));
         int marginPercent =     Integer.parseInt(table.getPropertyAsString("Margin_Percent"));
        }
    }
}
catch (Exception e) 
{}
}   }

条形图活动.java

public class BarGraphActivity extends Chart
{   
public void onCreate(Bundle savedInstanceState)  
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main1);
    DrawGraph();
   }
Chart ch = new Chart();


 public void DrawGraph() 
 {

String[] titles = new String[] { " Barcharts",""};

int[] x_axis =null;   
int[] y_axis =null;

List<int[]> values = new ArrayList<int[]>();
values.add(x_axis);
values.add(y_axis);

int[] colors = new int[] { Color.WHITE, Color.BLACK};

XYMultipleSeriesRenderer renderer = buildBarRenderer(colors);
renderer.setOrientation(Orientation.HORIZONTAL);
setChartSettings(renderer, "some texts", " ", " ",0,x_axis, 0,y_axis, Color.GRAY, Color.LTGRAY);

renderer.setXLabels(1);
renderer.addXTextLabel(2, "orderNo");
renderer.addYTextLabel(2, "freight");
renderer.setPanEnabled(false, false);

int length = renderer.getSeriesRendererCount();
for (int i = 0; i < length; i++) 
{
  SimpleSeriesRenderer seriesRenderer = renderer.getSeriesRendererAt(i);
  seriesRenderer.setDisplayChartValues(true);
  }

    ChartFactory.getBarChartIntent(this, buildBarDataset(titles, values), renderer,Type.DEFAULT);
  }

public XYMultipleSeriesRenderer buildBarRenderer(int[] colors) 
{
    // creates a SeriesRenderer and initializes it with useful default values as well as colors

XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();

 renderer.setAxisTitleTextSize(15);
 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;
   }

 public void setChartSettings(XYMultipleSeriesRenderer renderer, String title, String xTitle,String yTitle, int xMin, int[] x_axis, int yMin, int[] y_axis, int axesColor,int labelsColor) 
 {
    // sets lots of default values for this renderer

renderer.setChartTitle(title);

renderer.setXTitle(xTitle);
renderer.setYTitle(yTitle);

renderer.setXAxisMin(xMin);

renderer.setYAxisMin(yMin);
renderer.setAxesColor(axesColor);
renderer.setLabelsColor(labelsColor);

renderer.setApplyBackgroundColor(true);
renderer.setBackgroundColor(Color.BLACK);
}

public XYMultipleSeriesDataset buildBarDataset(String[] titles, List<int[]> values) 
 {
    // adds the axis titles and values into the dataset

XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();

int length = titles.length;

 for (int i = 0; i < length; i++) 
 {
   CategorySeries series = new CategorySeries(titles[i]);

   int[] v = values.get(i);

   int seriesLength = v.length;

   for (int k = 0; k < seriesLength; k++) 
   {
     series.add(v[k]);
    }

   dataset.addSeries(series.toXYSeries());
   }
   return dataset;
  } }

感谢您宝贵的时间！..

4

2 回答 2

2

1- 从 Web 服务中获取值。

这实际上与条形图无关。只需调用 Web 服务并获取您需要的值。

2- 获得值后，您可以使用achartengine创建条形图。

编辑：

阅读您的更新后，这是我的一般想法。

在chart.java中，您正在调用 Web 服务并将值读入局部变量，因此这些值不会存储在任何地方。

在BarGraphActivity.DrawGraph()，x_axis并且y_axis总是null，因此NullPointerException。

解决方案：

在您的第一个活动中，将您的值收集到int数组中，并在您开始第二个活动时将它们发送到 Intent 中。

在后者中，检索数组并将它们传递给DrawGraph().

还有一点需要注意：您在主线程上调用 Web 服务，这是不可取的。你应该把它移到doInBackground()an 的方法中AsyncTask。

于 2012-09-21T09:39:49.793 回答
0

对我来说，这看起来像是一些糟糕的 XML。你的解析器给了你一个NullPointerException.

我不知道您的 Android 代码使用的是哪个解析器，SAX 还是 DOM。我不知道您调用的服务是发回原始 XML 还是包装在 SOAP 信封中。我不知道您是否使用知道如何从 SOAP 信封中提取有效负载的 SOAP 客户端。我不知道一旦你拥有了你的数据，你在做什么。

但你应该。

于 2012-09-21T09:45:06.710 回答