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我是 android 开发的菜鸟，我正在尝试在对话框中显示饼图。但是，我无法显示饼图。我使用 XYChartBuilder.java 作为我的指南，正如这个 SO question here所建议的那样. 我使用 achart 演示 xychart.xml 来测试我的布局设计，它与演示完美配合。但是当我尝试对我的应用程序使用相同的 xml 配置时，我得到一个 nullpointerexception 说 android.graphics.Canvas.throwIfRecycled。我所做的唯一更改是在通过 layoutinflater 打开对话框时实例化 ChartView，而不是在演示中的 onResume 期间。当我将图表线性布局从定义的 200dp 高度更改为“wrap_content”时，不会引发异常。我在清单中包含了活动 android:name="org.achartengine.GraphicalActivity" /> 所以这不是问题。问题必须与对话框有关。任何帮助是极大的赞赏。

我的 XML

  <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <com.activity.GSCC.SegmentedRadioGroup
        android:id="@+id/segment_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dip"
        android:checkedButton="@+id/button_one"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@id/button_one"
            android:layout_weight="0.25"
            android:button="@null"
            android:gravity="center"
            android:minHeight="33dip"
            android:minWidth="40dip"
            android:text="Ledger"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:textColor="@color/radio_colors" />

        <RadioButton
            android:id="@+id/button_two"
            android:layout_weight="0.25"
            android:button="@null"
            android:gravity="center"
            android:minHeight="33dip"
            android:minWidth="40dip"
            android:text="Chart"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:textColor="@color/radio_colors" />
    </com.activity.GSCC.SegmentedRadioGroup>
</LinearLayout>

<ScrollView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fillViewport="true"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <TableLayout
            android:id="@+id/tableLayout1"
            android:layout_width="fill_parent"
            android:layout_height="105dp" >

            <TableRow>

                <TextView
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="Coin"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" />

                <TextView
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="Qty."
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" />

                <TextView
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="Oz."
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" />

                <TextView
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="Value"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" />
            </TableRow>

            <TableRow>

                <TextView
                    android:id="@+id/tvcurrentcoin"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:ellipsize="none"
                    android:maxWidth="100dp"
                    android:text="CurrentCoin"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" >
                </TextView>

                <TextView
                    android:id="@+id/tvcurrentqty"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="CurrentQuantity"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" />

                <TextView
                    android:id="@+id/tvcurrentoz"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="CurrentOunces"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" >
                </TextView>

                <TextView
                    android:id="@+id/tvcurrentvalue"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="CurrentValue"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" >
                </TextView>
            </TableRow>

            <TableRow>

                <TextView
                    android:id="@+id/nothing2"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:ellipsize="none"
                    android:maxWidth="100dp"
                    android:text=""
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" >
                </TextView>

                <TextView
                    android:id="@+id/nothing"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text=""
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" />

                <TextView
                    android:id="@+id/tvTotalValue"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="TOTAL:"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" >
                </TextView>

                <TextView
                    android:id="@+id/tvportfoliovalue"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1"
                    android:text="CurrentValue"
                    android:textColor="#FFFFFF"
                    android:textSize="12dp" >
                </TextView>
            </TableRow>
        </TableLayout>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/add_values" />

        <TableLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TableRow>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="5dip"
                    android:text="@string/x" />

                <EditText
                    android:id="@+id/xValue"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:enabled="false" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="5dip"
                    android:text="@string/y" />

                <EditText
                    android:id="@+id/yValue"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:enabled="false" />

                <Button
                    android:id="@+id/add"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:enabled="false"
                    android:text="@string/add" />
            </TableRow>
        </TableLayout>

        <LinearLayout
            android:id="@+id/chart"
            android:layout_width="fill_parent"
            android:layout_height="200dp" //Doesn't throw exception when set to "wrap content"
            android:layout_weight="1"
            android:orientation="horizontal" />

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/new_series"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/new_series" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <Spinner
                android:id="@+id/spinneradd"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.77" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent" >

                <Spinner
                    android:id="@+id/spinnermodify"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.70" />
            </LinearLayout>
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <Spinner
                android:id="@+id/spinnerdelete"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.77" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <Spinner
                android:id="@+id/spinnerchange"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1.40" />
        </LinearLayout>

        <Button
            android:id="@+id/bSQLdeleteall"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Delete All Entries" />
    </LinearLayout>
</ScrollView>

我的代码

LayoutInflater layoutInflater = getLayoutInflater();
View view=layoutInflater.inflate(R.layout.sqliteexample2,null);

//CHART ADDITIONS
            if (mChartView == null) {
                  piechartlayout = (LinearLayout) view.findViewById(R.id.chart);
                  mChartView = ChartFactory.getLineChartView(Activity.this, mDataset, mRenderer);
                  mRenderer.setClickEnabled(true);
                  mRenderer.setSelectableBuffer(100);                     
                  mChartView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                      SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
                      double[] xy = mChartView.toRealPoint(0);
                      if (seriesSelection == null) {
                        Toast.makeText(Activity.this, "No chart element was clicked", Toast.LENGTH_SHORT)
                            .show();
                      } else {
                        Toast.makeText(Activity.this,
                            "Chart element in series index " + seriesSelection.getSeriesIndex()
                                + " data point index " + seriesSelection.getPointIndex() + " was clicked"
                                + " closest point value X=" + seriesSelection.getXValue() + ", Y=" + seriesSelection.getValue()
                                + " clicked point value X=" + (float) xy[0] + ", Y=" + (float) xy[1], Toast.LENGTH_SHORT).show();
                      }
                    }
                  });
                  mChartView.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                      SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
                      if (seriesSelection == null) {
                        Toast.makeText(Activity.this, "No chart element was long pressed",
                            Toast.LENGTH_SHORT);
                        return false; // no chart element was long pressed, so let something
                        // else handle the event
                      } else {
                        Toast.makeText(Activity.this, "Chart element in series index "
                            + seriesSelection.getSeriesIndex() + " data point index "
                            + seriesSelection.getPointIndex() + " was long pressed", Toast.LENGTH_SHORT);
                        return true; // the element was long pressed - the event has been
                        // handled
                      }
                    }
                  });
                  mChartView.addZoomListener(new ZoomListener() {
                    public void zoomApplied(ZoomEvent e) {
                      String type = "out";
                      if (e.isZoomIn()) {
                        type = "in";
                      }
                      System.out.println("Zoom " + type + " rate " + e.getZoomRate());
                    }

                    public void zoomReset() {
                      System.out.println("Reset");
                    }
                  }, true, true);
                  mChartView.addPanListener(new PanListener() {
                    public void panApplied() {
                      System.out.println("New X range=[" + mRenderer.getXAxisMin() + ", " + mRenderer.getXAxisMax()
                          + "], Y range=[" + mRenderer.getYAxisMax() + ", " + mRenderer.getYAxisMax() + "]");
                    }
                  });
                  piechartlayout.addView(mChartView, new LayoutParams(LayoutParams.WRAP_CONTENT,
                      LayoutParams.WRAP_CONTENT));
                  boolean enabled = mDataset.getSeriesCount() > 0;
                  setSeriesEnabled(enabled);
                } else {
                  mChartView.repaint();
                }

            //////CHART ADDITIONS
                    mX = (EditText) view.findViewById(R.id.xValue);
                    mX.setEnabled(true);
                    mY = (EditText) view.findViewById(R.id.yValue);
                    mY.setEnabled(true);
                    mRenderer.setApplyBackgroundColor(true);
                    mRenderer.setBackgroundColor(Color.argb(100, 50, 50, 50));
                    mRenderer.setAxisTitleTextSize(16);
                    mRenderer.setChartTitleTextSize(20);
                    mRenderer.setLabelsTextSize(15);
                    mRenderer.setLegendTextSize(15);
                    mRenderer.setMargins(new int[] { 20, 30, 15, 0 });
                    mRenderer.setZoomButtonsVisible(true);
                    mRenderer.setPointSize(10);
                    mRenderer.setInScroll(true);

                    mAdd = (Button) view.findViewById(R.id.add);
                    mAdd.setEnabled(true);
                    mNewSeries = (Button) view.findViewById(R.id.new_series);
                    mNewSeries.setOnClickListener(new View.OnClickListener() {
                      public void onClick(View v) {
                        String seriesTitle = "Series " + (mDataset.getSeriesCount() + 1);
                        XYSeries series = new XYSeries(seriesTitle);
                        mDataset.addSeries(series);
                        mCurrentSeries = series;
                        XYSeriesRenderer renderer = new XYSeriesRenderer();
                        mRenderer.addSeriesRenderer(renderer);
                        renderer.setPointStyle(PointStyle.CIRCLE);
                        renderer.setFillPoints(true);
                        mCurrentRenderer = renderer;
                        setSeriesEnabled(true);
                      }
                    });


                    mAdd.setOnClickListener(new View.OnClickListener() {
                      public void onClick(View v) {
                        double x = 0;
                        double y = 0;
                        try {
                          x = Double.parseDouble(mX.getText().toString());
                        } catch (NumberFormatException e) {
                          // TODO
                          mX.requestFocus();
                          return;
                        }
                        try {
                          y = Double.parseDouble(mY.getText().toString());
                        } catch (NumberFormatException e) {
                          // TODO
                          mY.requestFocus();
                          return;
                        }
                        mCurrentSeries.add(12, 0);
                        mX.setText("");
                        mY.setText("");
                        mX.requestFocus();
                        if (mChartView != null) {
                          mChartView.repaint();
                        }
                        Bitmap bitmap = mChartView.toBitmap();
                        try {
                          File file = new File(Environment.getExternalStorageDirectory(), "test" + index++ + ".png");
                          FileOutputStream output = new FileOutputStream(file);
                          bitmap.compress(CompressFormat.PNG, 100, output);
                        } catch (Exception e) {
                          e.printStackTrace();
                        }
                      }
                    });
                    //END CHART ADDITIONS

全栈跟踪（当我为包含图表的布局提供定义的 100dp 高度时）

11-14 20:28:13.430: E/AndroidRuntime(26620): java.lang.NullPointerException
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.graphics.Canvas.throwIfRecycled(Canvas.java:954)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.graphics.Canvas.drawBitmap(Canvas.java:980)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at org.achartengine.GraphicalView.onDraw(GraphicalView.java:174)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.View.draw(View.java:6880)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.View.draw(View.java:6986)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.widget.ScrollView.draw(ScrollView.java:1409)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.View.draw(View.java:6883)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.View.draw(View.java:6883)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2116)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewRoot.draw(ViewRoot.java:1565)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewRoot.performTraversals(ViewRoot.java:1301)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.view.ViewRoot.handleMessage(ViewRoot.java:1914)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.os.Looper.loop(Looper.java:130)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at android.app.ActivityThread.main(ActivityThread.java:3859)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at java.lang.reflect.Method.invokeNative(Native Method)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at java.lang.reflect.Method.invoke(Method.java:507)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-14 20:28:13.430: E/AndroidRuntime(26620):    at dalvik.system.NativeStart.main(Native Method)
4

2 回答 2

1

我之前遇到过类似的问题。尝试在对话框中使用缩放功能是不可能的。尝试注释掉 setzoomvisible，它应该适合你。

于 2012-11-19T04:40:31.620 回答
0

我建议您首先下载整个 AChartEngine 演示程序并按原样运行。然后，您可以开始逐步修改它，直到获得您需要的版本。

于 2012-11-15T08:22:07.820 回答