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我正在使用 AChartEngine 制作图表，到目前为止似乎运行良好。唯一能让这个完美的事情就是能够把这个图表放在一个弹出窗口上。不幸的是，我不知道该怎么做。每当我尝试在弹出窗口中包含要调用的图表函数时，我都会得到 NullPointerException。这是我的弹出窗口的代码（每当我单击按钮时都会调用它）

void popupWindow(){
     LayoutInflater layoutInflater 
     = (LayoutInflater)getBaseContext()
      .getSystemService(LAYOUT_INFLATER_SERVICE);  
    View popupView = layoutInflater.inflate(R.layout.activity_report_popup_layout, null);  
             final PopupWindow popupWindow = new PopupWindow(
               popupView, 
               LayoutParams.WRAP_CONTENT,  
                     LayoutParams.WRAP_CONTENT);  
             Button btnDismiss = (Button)popupView.findViewById(R.id.dismiss);
             btnDismiss.setOnClickListener(new Button.OnClickListener(){

     @Override
     public void onClick(View v) {
      // TODO Auto-generated method stub
      popupWindow.dismiss();
     }});

             popupWindow.showAsDropDown(plotsButton, 50, -30);

   }

这是相关的弹出布局xml代码：

      <TextView
         android:id="@+id/textView1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Popup"
         android:textAppearance="?android:attr/textAppearanceLarge" />

      <TextView
         android:id="@+id/textView2"
         android:layout_marginTop="5dp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="This is a simple popup" />

         <Button
         android:id="@+id/dismiss"
         android:layout_marginTop="10dp"
         android:layout_gravity="center_horizontal"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Close" />


         <LinearLayout
              android:orientation="horizontal"
              android:id="@+id/chart_container"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_below="@id/tv_title" >

          </LinearLayout>

编辑：决定还添加图表代码：

 private void openChart(){

        Date[] dt = new Date[dates.size()];
        float[] visits = new float[dates.size()];
        for(int i=0;i<dates.size();i++){
            try {
                dt[i]= new SimpleDateFormat("yyyy-MM-dd").parse(dates.get(i));
                visits[i] = Float.parseFloat(distance.get(i));
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        TimeSeries visitsSeries = new TimeSeries("Visits");

        for(int i=0;i<dt.length;i++){
            visitsSeries.add(dt[i], visits[i]);
        }

        XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();

        dataset.addSeries(visitsSeries);

        XYSeriesRenderer visitsRenderer = new XYSeriesRenderer();
        visitsRenderer.setColor(Color.BLACK);
        visitsRenderer.setPointStyle(PointStyle.CIRCLE);
        visitsRenderer.setFillPoints(true);
        visitsRenderer.setLineWidth(2);
        visitsRenderer.setDisplayChartValues(true);

        XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();

        multiRenderer.addSeriesRenderer(visitsRenderer);

        LinearLayout chartContainer = (LinearLayout) findViewById(R.id.chart_container);

        mChart = (GraphicalView) ChartFactory.getTimeChartView(getBaseContext(), dataset, multiRenderer,"dd-MMM-yyyy");

        multiRenderer.setClickEnabled(true);
        multiRenderer.setSelectableBuffer(10);

            chartContainer.addView(mChart);
    }

编辑 2：添加了错误日志：

 05-16 10:45:39.013: E/AndroidRuntime(6311): FATAL EXCEPTION: main
 05-16 10:45:39.013: E/AndroidRuntime(6311): Process: com.example.jfitnessfunctiontester, PID: 6311
 05-16 10:45:39.013: E/AndroidRuntime(6311): java.lang.NullPointerException
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at activities.ReportListViewActivity.openChart(ReportListViewActivity.java:256)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at activities.ReportListViewActivity.popupWindow(ReportListViewActivity.java:115)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at activities.ReportListViewActivity$2.onClick(ReportListViewActivity.java:137)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at android.view.View.performClick(View.java:4438)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at android.view.View$PerformClick.run(View.java:18422)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at android.os.Handler.handleCallback(Handler.java:733)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at android.os.Handler.dispatchMessage(Handler.java:95)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at android.os.Looper.loop(Looper.java:136)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at android.app.ActivityThread.main(ActivityThread.java:5017)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at java.lang.reflect.Method.invokeNative(Native Method)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at java.lang.reflect.Method.invoke(Method.java:515)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
 05-16 10:45:39.013: E/AndroidRuntime(6311):    at dalvik.system.NativeStart.main(Native Method)
4

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