在android中创建条形图

有没有人遇到过这个问题。现在我正在试图在android中显示一个条形图，但是我通过使用它来从Web服务中获取x和y轴的值。我正在消耗它由SOAP的方法。在这里我得到这个问题，谁能告诉我如何解决这个问题？在android中创建条形图

logcat的

09-17 10:18:09.651: W/KeyCharacterMap(339): No keyboard for id 0 
09-17 10:18:09.651: W/KeyCharacterMap(339): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 
09-17 10:18:20.450: D/AndroidRuntime(339): Shutting down VM 
09-17 10:18:20.450: W/dalvikvm(339): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
09-17 10:18:20.460: E/AndroidRuntime(339): FATAL EXCEPTION: main 
09-17 10:18:20.460: E/AndroidRuntime(339): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.xmlparsing_test/com.example.xmlparsing_test.BarGraphActivity}: java.lang.NullPointerException 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.os.Looper.loop(Looper.java:123) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.ActivityThread.main(ActivityThread.java:4627) 
09-17 10:18:20.460: E/AndroidRuntime(339): at java.lang.reflect.Method.invokeNative(Native Method) 
09-17 10:18:20.460: E/AndroidRuntime(339): at java.lang.reflect.Method.invoke(Method.java:521) 
09-17 10:18:20.460: E/AndroidRuntime(339): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
09-17 10:18:20.460: E/AndroidRuntime(339): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
09-17 10:18:20.460: E/AndroidRuntime(339): at dalvik.system.NativeStart.main(Native Method) 
09-17 10:18:20.460: E/AndroidRuntime(339): Caused by: java.lang.NullPointerException 
09-17 10:18:20.460: E/AndroidRuntime(339): at com.example.xmlparsing_test.BarGraphActivity.buildBarDataset(BarGraphActivity.java:120) 
09-17 10:18:20.460: E/AndroidRuntime(339): at com.example.xmlparsing_test.BarGraphActivity.DrawGraph(BarGraphActivity.java:61) 
09-17 10:18:20.460: E/AndroidRuntime(339): at com.example.xmlparsing_test.BarGraphActivity.onCreate(BarGraphActivity.java:26) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
09-17 10:18:20.460: E/AndroidRuntime(339): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
09-17 10:18:20.460: E/AndroidRuntime(339): ... 11 more

BarGraphActivity.java

public class BarGraphActivity extends Chart 
{ 

public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main1); 

    Chart ch = new Chart(); 
    DrawGraph(); 
} 

public void DrawGraph() 
{ 
String[] titles = new String[] { " Barcharts",""}; 

double[] x_axis = null; 
double[] y_axis = null; 

List<double[]> values = new ArrayList<double[]>(); 

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(1, "x_axis"); 
renderer.addYTextLabel(1, "y_axis"); 

renderer.setPanEnabled(true, 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); 
} 

protected 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; 
    } 

protected void setChartSettings(XYMultipleSeriesRenderer renderer, String title, String xTitle, 
String yTitle, double xMin, double[] x_axis, double yMin, double[] 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); 
} 

protected XYMultipleSeriesDataset buildBarDataset(String[] titles, List<double[]> 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]); 

    double[] 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; 
} }

感谢您的宝贵时间！..

来源

2012-09-17 andro prabu

有在BarGraphActivity类，并在buildBarDataset方法 –

@GoogleResearcher我给BarGraphActivity.java对上述问题的参考的一个错误，你可以告诉什么我在这里犯的错误？ –

朋友可以发布你的第120行你的酒吧活动类 –

还有其他的方法，使图形做u需要此方法只或你想要其他吗？？如果是的，我将修改我的答案有一个新的Bar Graph Activity

来源

2012-09-17 07:27:18

在android中创建条形图

回答

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