public class AndroidTest extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         MyView mv = new MyView(this);         setContentView(mv);     }     public class MyView extends View {      MyView(Context context) {       super(context);      }   @Override   protected void onDraw(Canvas canvas) {    // TODO Auto-generated method stub    super.onDraw(canvas);    // 首先定义一个paint    Paint paint = new Paint();    // 绘制矩形区域-实心矩形    // 设置颜色    paint.setColor(Color.BLUE);    // 设置样式-填充    paint.setStyle(Style.FILL);    // 绘制一个矩形    canvas.drawRect(new Rect(0, 0, getWidth(), getHeight()), paint);    // 绘空心矩形    // 设置颜色    paint.setColor(Color.RED);    // 设置样式-空心矩形    paint.setStyle(Style.STROKE);    // 绘制一个矩形    canvas.drawRect(new Rect(10, 10, 100, 30), paint);    // 绘文字    // 设置颜色    paint.setColor(Color.GREEN);    // 绘文字    canvas.drawText("Hello", 10, 50, paint);    // 绘图    // 从资源文件中生成位图    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);    // 绘图    canvas.drawBitmap(bitmap, 10, 60, paint);   }     } }