SurfaceView的用法

新建工程UsingSurfaceView

新建一个类GameView继承至SurfaceView并实现Callback接口

添加构造方法，并复写Callback的三个未实现的方法

创建一个容器Contanier承载所有的View

public class Contanier {

private List<Contanier> children=null;

public Contanier(){

children = new ArrayList<Contanier>();

}

public void draw(Canvas canvas){

childrenView(canvas);

for (Contanier c:children) {

c.draw(canvas);

}

}

public void childrenView(Canvas canvas){

}

public void addChildrenView(Contanier child){

children.add(child);

}

public void removeChildrenView(Contanier child){

children.remove(child);

}

}

新建一个Contanier子类Rect

public class Rect extends Contanier{

private Paint paint = null;

public Rect(){

paint=new Paint();

paint.setColor(Color.RED);

}

//复写childrenView方法

public void childrenView(Canvas canvas) {

super.childrenView(canvas);

canvas.drawRect(0, 0, 100, 100, paint);

}

}

再新建一个Contanier子类

public class Circle extends Contanier{

private Paint paint=null;

public Circle(){

paint=new Paint();

paint.setColor(Color.BLUE);

}

@Override

public void childrenView(Canvas canvas) {

// TODO Auto-generated method stub

super.childrenView(canvas);

canvas.drawCircle(50, 50, 50, paint);

}

}

返回类GameView进行初始化

private Contanier contanier;

private Rect rect;

private Circle circle;

public GameView(Context context) {

super(context);

contanier = new Contanier();

rect = new Rect();

circle = new Circle();

rect.addChildrenView(circle);

contanier.addChildrenView(rect);

//添加回调

getHolder().addCallback(this);

}

在surfaceChanged方法中调用draw方法

在MainActivity中

setContentView(new GameView(this));

使绘制的图形移动起来

修改Contanier类

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 void draw(Canvas canvas){

canvas.save();

canvas.translate(getX(), getY());

childrenView(canvas);

for (Contanier c:children) {

c.draw(canvas);

}

canvas.restore();

}

修改Rect类的childrenView方法

public void childrenView(Canvas canvas) {

super.childrenView(canvas);

canvas.drawRect(0, 0, 100, 100, paint);

this.setY(getY()+1);

}

对移动操作 修改类GameView

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;

}

}

public void surfaceCreated(SurfaceHolder holder) {

// TODO Auto-generated method stub

startTimer();

}

@Override

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

// TODO Auto-generated method stub

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

// TODO Auto-generated method stub

stopTimer();

}