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我使用achartEngine庫繪製餅圖。如何將餅圖轉換爲圖像並存儲在SD卡中。如何將AchartEngine視圖轉換爲圖像
GraphicalView mChartview;
// after draw pie graph....
Bitmap bitmap =mChartview.toBitmap()
String fileName = "test" + ".png";
File file = new File(Environment.getExternalStorageDirectory(),
fileName);
FileOutputStream output = new FileOutputStream(file);
bitmap.compress(CompressFormat.PNG, 100, output);
但創建0大小的圖像問題。