在Bitmap上画图，并显示
通过以下代码，可以在一个Activity中画图，也可将其作为Bitmap保存。

int w = 320,h = 240;String mstrTitle = "Hello, itrats!";Bitmap mbmpTest = Bitmap.createBitmap(w,h, Config.ARGB_8888);Canvas canvasTemp = new Canvas(mbmpTest);canvasTemp.drawColor(Color.YELLOW);Paint p = new Paint();p.setAntiAlias(true);String familyName = "宋体";Typeface font = Typeface.create(familyName, Typeface.BOLD);p.setColor(Color.RED);p.setTypeface(font);p.setTextSize(22);canvasTemp.drawLine(0, 0, 150, 150, p);canvasTemp.drawText(mstrTitle,0,100,p);        p.setColor(Color.GREEN);int rx = 230;int ry = 170;int r = 60;RectF rf = new RectF(rx - r, ry - r, rx + r, ry + r);canvasTemp.drawArc(rf, 0, -120, true, p);ImageView iview = (ImageView)findViewById(R.id.iv);iview.setImageBitmap(mbmpTest);

另外，这里还有几种画图表的方法：
- Java4Less (http://java4less.com/charts/chart.php?info=android)
- Chart4J (http://code.google.com/p/charts4j/)
- BlueChart (http://code.google.com/p/bluechart/)- aChartEngine (http://code.google.com/p/achartengine/)
- aiCharts (http://www.artfulbits.com/Android/aiCharts.aspx)