Android通过onDraw实现在View中绘图操作

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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);    }    @Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.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); }        }}

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