android 自定義view

自定義的控件只需繼承android的View，並實現 onDraw()方法即可，上代碼：

public class GameView extends View {

    private Paint paint;
    public int angle = 10;
    public int scale = 1;

    public GameView(Context context) {
        super(context);
         paint = new Paint();
        new Thread(new MyThread()).start();
    }

    public GameView(Context context, AttributeSet attrs) {
        super(context, attrs);
        paint = new Paint();
        new Thread(new MyThread()).start();
    }
    //重寫onDraw方法
    public void onDraw(Canvas canvas){
        //設置畫筆
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);

        //畫一個矩形
        canvas.drawColor(Color.YELLOW);
        canvas.drawRect(50,5,90,25,paint);

        //在畫布上畫一個旋轉的文字
        canvas.save();//先調用save
        canvas.rotate(30);//旋轉
        paint.setColor(Color.BLACK);
        canvas.drawText("tesdsfsdfsdfsdfsdfsdf",0,20,80,60,paint);
        canvas.restore();//在調用restore，恢復

       Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.icon);

        Matrix matrix = new Matrix();

        matrix.setRotate(angle);//控制圖片旋轉
        matrix.postScale(scale, scale);//控制圖片縮放

        Bitmap dstbmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(),

                bmp.getHeight(), matrix, true);

        canvas.drawColor(Color.BLACK);

        canvas.drawBitmap(dstbmp, 10, 10, null);    }

    class  MyThread implements Runnable{

        @Override
        public void run() {
            while(!Thread.currentThread().isInterrupted()){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
                postInvalidate();//直接更新view
            }
        }
    }
}