The use of Surfaceview

New Project Usingsurfaceview

Create a new class Gameview inherit to Surfaceview and implement the callback interface

Add a constructor method, and make a copy of the callback three non-implemented methods

Create a container contanier to host all 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);

}

}

Create a new Contanier sub-class rect

Public class Rect extends contanier{

Private Paint paint = null;

Public Rect () {

paint=New Paint ();

Paint.setcolor (Color. RED);

}

Replication Childrenview Method

Public void childrenview (canvas canvas) {

Super. Childrenview (canvas);

Canvas.drawrect (0, 0, +, +, paint);

}

}

Create a new Contanier subclass

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 (N, A, (), paint);

}

}

Returns class Gameview for initialization

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);

Add callback

Getholder (). Addcallback (this);

}

Call the Draw method in the Surfacechanged method

In the Mainactivity

Setcontentview (new Gameview (this));

Move a drawn shape

Modifying the Contanier class

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 ();

}

Modifying the Childrenview method of a Rect class

Public void childrenview (canvas canvas) {

Super. Childrenview (canvas);

Canvas.drawrect (0, 0, +, +, paint);

this. Sety (GetY () +1);

}

Modify the class Gameview for a move operation

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 ();

}

The use of Surfaceview