Android SurfaceView绘制组合图形_安卓手绘app 开源 surfaceview-优快云博客

本文链接：https://blog.youkuaiyun.com/monkeyzsf/article/details/39802361

本文介绍了一个使用Android SurfaceView进行绘图的应用案例。通过定义自定义视图MyOwnView及其子类Rect和Circle，实现了组合图形的绘制。这些图形能够动态更新，并通过计时器触发连续重绘，展示了一个简单的动画效果。

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Android SurfaceView绘制组合图形

完整代码如下：

MyOwnView.java

public class MyOwnView {

    private List<MyOwnView> views = null;
    private float x = 0, y = 0;

    public float getX() {
        return x;
    }

    public void setX(float x) {
        this.x = x;
    }

    public float getY() {
        return y;
    }

    public void setY(float y) {
        this.y = y;
    }

    public MyOwnView() {
        views = new ArrayList<MyOwnView>();
    }

    public void addView(MyOwnView myOwnView) {
        views.add(myOwnView);
    }

    public void removeView(MyOwnView myOwnView) {
        views.remove(myOwnView);
    }

    public void draw(Canvas canvas) {
        canvas.save();
        canvas.translate(getX(), getY());
        drawView(canvas);
        for (MyOwnView myOwnView : views) {
            myOwnView.draw(canvas);
        }
        canvas.restore();
    }

    public void drawView(Canvas canvas) {}
}

Rect.java

public class Rect extends MyOwnView {

    private Paint paint = null;

    public Rect() {
        paint = new Paint();
        paint.setColor(Color.RED);
    }

    @Override
    public void drawView(Canvas canvas) {
        super.drawView(canvas);
        canvas.drawRect(0, 0, 100, 100, paint);
        this.setY(this.getY() + 1);
    }
}

Circle.java

public class Circle extends MyOwnView {

    private Paint paint = null;

    public Circle() {
        paint = new Paint();
        paint.setColor(Color.BLUE);
    }

    @Override
    public void drawView(Canvas canvas) {
        super.drawView(canvas);
        canvas.drawCircle(50, 50, 50, paint);
    }
}

MyView.java

public class MyView extends SurfaceView implements SurfaceHolder.Callback{

    private MyOwnView myOwnView;
    private Rect rect;
    private Circle circle;

    public MyView(Context context) {
        super(context);
        myOwnView = new MyOwnView();
        rect = new Rect();
        circle = new Circle();
        rect.addView(circle);
        myOwnView.addView(rect);
        getHolder().addCallback(this);
    }

    public void draw() {
        Canvas canvas = getHolder().lockCanvas();
        canvas.drawColor(Color.WHITE);        
        myOwnView.draw(canvas);
        getHolder().unlockCanvasAndPost(canvas);
    }

    private Timer timer = null;
    private TimerTask task = null;

    public void startTimer() {
        timer = new Timer();
        task = new TimerTask() {

            @Override
            public void run() {
                draw();
            }
        };
        timer.schedule(task, 100, 100);
    }

    public void stopTimer() {
        if(timer != null) {
            timer.cancel();
            timer = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        startTimer();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        stopTimer();
    }

}

MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new MyView(this));
    }

}