surfaceview和surfaceholde源码分析及其运用

最新推荐文章于 2024-12-24 21:31:33 发布

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最新推荐文章于 2024-12-24 21:31:33 发布 · 916 阅读

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#android #SurfaceHolder #SurfaceView #源码

本文深入探讨了SurfaceView和SurfaceHolder在Android开发中的作用和源码分析。SurfaceHolder作为Surface的控制器，提供锁定画布和更新显示内容的功能。SurfaceView是View的子类，内嵌Surface并提供独立的渲染线程，常用于游戏开发以提高程序响应速度。文章还介绍了SurfaceHolder.Callback接口，用于监听Surface的变化，并强调了在UI线程和渲染线程中操作SurfaceView的注意事项。

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1、SurfaceHolder
public interface SurfaceHolder

显示一个surface的抽象接口，使你可以控制surface的大小和格式，以及在surface上编辑像素，和监视surace的改变。

这个接口通常通过SurfaceView类实现。

源码

	public interface SurfaceHolder {
		//.........
	    public interface Callback {
	        /**
	         * This is called immediately after the surface is first created.
	         * Implementations of this should start up whatever rendering code
	         * they desire.  Note that only one thread can ever draw into
	         * a {@link Surface}, so you should not draw into the Surface here
	         * if your normal rendering will be in another thread.
	         * 
	         * @param holder The SurfaceHolder whose surface is being created.
	         */
	        public void surfaceCreated(SurfaceHolder holder);

	        /**
	         * This is called immediately after any structural changes (format or
	         * size) have been made to the surface.  You should at this point update
	         * the imagery in the surface.  This method is always called at least
	         * once, after {@link #surfaceCreated}.
	         * 
	         * @param holder The SurfaceHolder whose surface has changed.
	         * @param format The new PixelFormat of the surface.
	         * @param width The new width of the surface.
	         * @param height The new height of the surface.
	         */
	        public void surfaceChanged(SurfaceHolder holder, int format, int width,
	                int height);

	        /**
	         * This is called immediately before a surface is being destroyed. After
	         * returning from this call, you should no longer try to access this
	         * surface.  If you have a rendering thread that directly accesses
	         * the surface, you must ensure that thread is no longer touching the 
	         * Surface before returning from this function.
	         * 
	         * @param holder The SurfaceHolder whose surface is being destroyed.
	         */
	        public void surfaceDestroyed(SurfaceHolder holder);
	    }
	    //.....................
	}

surface的控制器，用来操纵surface，处理它的Canvas上画的效果和动画，控制表面，大小，像素等。
几个需要注意的方法：
(1)、abstract void addCallback(SurfaceHolder.Callback callback);
// 给SurfaceView当前的持有者一个回调对象。
(2)、