的Android GridView控件與扇形圖，UnsupportedOperationException異常：addView（查看，的LayoutParams）

Question

我想通過使用Achartengine顯示扇形圖在的GridView，

它說java.lang.UnsupportedOperationException：addView（查看，的LayoutParams）在適配器視圖不支持 我不知道爲什麼，有些建議PLZ ....

我的適配器類別：

public class GraphAdapter extends BaseAdapter { 
    class ViewHolder { 

     private LinearLayout layout; 
     private int[] COLORS = new int[] { Color.GREEN, Color.BLUE, 
       Color.MAGENTA, Color.CYAN }; 
     private CategorySeries mSeries; 
     private DefaultRenderer mRenderer; 
     private GraphicalView mChartView; 

     public ViewHolder(View view) { 
      layout = (LinearLayout) view.findViewById(R.id.adapter_dash_graph); 
      mRenderer = new DefaultRenderer(); 
      mSeries = new CategorySeries(""); 
      mChartView = ChartFactory.getPieChartView(mContext, mSeries, 
        mRenderer); 
     } 

     private void updateChild(String[] names, int[] values) { 
      renderGraph(names, values); 
      // Draw chart 
      mChartView.repaint(); 
      layout.addView(mChartView); 
     } 

     private void renderGraph(String[] names, int[] values) { 
      mRenderer.setApplyBackgroundColor(true); 
      mRenderer.setBackgroundColor(mContext.getResources().getColor(
        android.R.color.white)); 
      mRenderer.setChartTitleTextSize(20); 
      mRenderer.setLabelsTextSize(20); 
      mRenderer.setLabelsColor(mContext.getResources().getColor(
        R.color.blue_dark)); 
      mRenderer.setLegendTextSize(20); 
      mRenderer.setShowLegend(true); 
      mRenderer.setMargins(new int[] { 20, 30, 15, 0 }); 
      mRenderer.setZoomButtonsVisible(false); 
      mRenderer.setStartAngle(90); 
      mRenderer.setZoomEnabled(false); 
      mRenderer.setPanEnabled(false); 
      for (int i = 0; i < values.length; i++) { 
       mSeries.add(names[i] + " " + values[i], values[i]); 
       SimpleSeriesRenderer renderer = new SimpleSeriesRenderer(); 
       renderer.setColor(COLORS[(mSeries.getItemCount() - 1) 
         % COLORS.length]); 
       mRenderer.addSeriesRenderer(renderer); 
      } 
     } 
    } 

    private Context mContext; 
    private List<OverallDetails> mUserMenus; 

    public GraphAdapter(Context context, List<OverallDetails> slideMenus) { 

     this.mContext = context; 
     this.mUserMenus = slideMenus; 
    } 

    @Override 
    public int getCount() { 
     return mUserMenus.size(); 
    } 

    @Override 
    public OverallDetails getItem(int position) { 
     return mUserMenus.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup group) { 
     ViewHolder viewHolder = null; 
     if (convertView == null) { 
      convertView = View.inflate(mContext, R.layout.adapter_graph, group); 
      viewHolder = new ViewHolder(convertView); 
      convertView.setTag(viewHolder); 
     } 
     viewHolder.updateChild(
       mContext.getResources().getStringArray(R.array.graph_name), 
       mContext.getResources().getIntArray(R.array.graph_values)); 
     return convertView; 
    } 

} 

Answer 1

嘗試實施ViewHolder這樣：

public class GraphAdapter extends BaseAdapter { 

    private int[] COLORS = new int[] { Color.GREEN, Color.BLUE,Color.MAGENTA, Color.CYAN }; 
    private Context mContext; 
    private List<OverallDetails> mUserMenus; 

    public GraphAdapter(Context context, List<OverallDetails> slideMenus) { 
     this.mContext = context; 
     this.mUserMenus = slideMenus; 
    } 

    @Override 
    public int getCount() { 
     return mUserMenus.size(); 
    } 

    @Override 
    public Objects getItem(int position) { 
     return mUserMenus.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup group) { 
     ViewHolder viewHolder; 
     if (convertView == null) { 
      viewHolder = new ViewHolder(); 
      convertView = LayoutInflater.from(mContext).inflate(R.layout.adapter_graph, null); 
      viewHolder.layout = (LinearLayout) convertView.findViewById(R.id.adapter_dash_graph); 
      convertView.setTag(viewHolder); 

     }else{ 
      viewHolder = (ViewHolder) convertView.getTag(); 
     } 

     DefaultRenderer mRenderer = new DefaultRenderer(); 
     CategorySeries mSeries = new CategorySeries(""); 
     GraphicalView mChartView = ChartFactory.getPieChartView(mContext, mSeries,mRenderer); 
     renderGraph(mRenderer,mSeries,mContext.getResources().getStringArray(R.array.graph_name),mContext.getResources().getIntArray(R.array.graph_values)); 
     // Draw chart 
     mChartView.repaint(); 
     viewHolder.layout.removeAllViews(); 
     viewHolder.layout.addView(mChartView); 

     return convertView; 
    } 

    class ViewHolder{ 
     LinearLayout layout; 
    } 
    private void renderGraph(DefaultRenderer mRenderer,CategorySeries mSeries,String[] names, int[] values) { 
     mRenderer.setApplyBackgroundColor(true); 
     mRenderer.setBackgroundColor(mContext.getResources().getColor(android.R.color.white)); 
     mRenderer.setChartTitleTextSize(20); 
     mRenderer.setLabelsTextSize(20); 
     mRenderer.setLabelsColor(mContext.getResources().getColor(R.color.blue_dark)); 
     mRenderer.setLegendTextSize(20); 
     mRenderer.setShowLegend(true); 
     mRenderer.setMargins(new int[] { 20, 30, 15, 0 }); 
     mRenderer.setZoomButtonsVisible(false); 
     mRenderer.setStartAngle(90); 
     mRenderer.setZoomEnabled(false); 
     mRenderer.setPanEnabled(false); 

     for (int i = 0; i < values.length; i++) { 
      mSeries.add(names[i] + " " + values[i], values[i]); 
      SimpleSeriesRenderer renderer = new SimpleSeriesRenderer(); 
      renderer.setColor(COLORS[(mSeries.getItemCount() - 1)% COLORS.length]); 
      mRenderer.addSeriesRenderer(renderer); 
     } 
    } 

}