/*** Drawable 就是一个可画的对象,* 其可能是一张位图(BitmapDrawable),* 也可能是一个图形(ShapeDrawable),* 还有可能是一个图层(LayerDrawable),* 我们根据画图的需求,创建相应的可画对象*/ public class DrawTestActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(new MyView(this));}class MyView extends View {private ShapeDrawable shapeDrawable;private Paint paint;public MyView(Context context) {super(context);shapeDrawable = new ShapeDrawable(new OvalShape());shapeDrawable.getPaint().setColor(Color.RED);//指定颜色shapeDrawable.setBounds(10, 10, 200, 100);//指定位置 paint = new Paint();paint.setColor(Color.BLUE); //颜色paint.setTextSize(20);//字体大小 paint.setTypeface(Typeface.DEFAULT_BOLD);//粗体字paint.setAntiAlias(true);//消除锯齿 }@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//画绿色背景 canvas.drawColor(Color.GREEN);//画椭圆shapeDrawable.draw(canvas);//将自己画到画布上//画文本,坐标是指矩形左下角坐标canvas.drawText("来自尚硅谷的你, 很NB", 10, 120, paint);}} }