SurfaceHolder源代码分析

最新推荐文章于 2021-09-06 23:47:50 发布

原创最新推荐文章于 2021-09-06 23:47:50 发布 · 1.3k 阅读

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本文介绍了Android中SurfaceHolder接口的源代码及其使用方法。重点讲解了如何实现Callback接口，并重写surfaceCreated、surfaceChanged和surfaceDestroyed方法。此外还涉及了Canvas的基本操作。

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package android.view;

import android.graphics.Canvas;
import android.graphics.Rect;

public interface SurfaceHolder {
    @Deprecated
    public static final int SURFACE_TYPE_NORMAL = 0;
    @Deprecated
    public static final int SURFACE_TYPE_HARDWARE = 1;
    @Deprecated
    public static final int SURFACE_TYPE_GPU = 2;
    @Deprecated
    public static final int SURFACE_TYPE_PUSH_BUFFERS = 3;
    
    public static class BadSurfaceTypeException extends RuntimeException {
        public BadSurfaceTypeException() {
        }

        public BadSurfaceTypeException(String name) {
            super(name);
        }
    }

    public interface Callback {
        public void surfaceCreated(SurfaceHolder holder);

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

        public void surfaceDestroyed(SurfaceHolder holder);
    }

    public interface Callback2 extends Callback {
        public void surfaceRedrawNeeded(SurfaceHolder holder);
    }
    public void addCallback(Callback callback);
    public void removeCallback(Callback callback);
    public boolean isCreating();
    @Deprecated
    public void setType(int type);
    public void setFixedSize(int width, int height);
    public void setSizeFromLayout();
    public void setFormat(int format);
    public void setKeepScreenOn(boolean screenOn);
    public Canvas lockCanvas();
    public Canvas lockCanvas(Rect dirty);
    public void unlockCanvasAndPost(Canvas canvas);
    public Rect getSurfaceFrame();
    public Surface getSurface();
}

在看SurfaceView时，得知利用SurfaceHolder来控制Surface，所以对这个Holder进行了了解。以上就是source for sdk中关于SurfaceHolder的源代码。

通过阅读该代码段，我们了解到在该接口中，主要就是需要实现Callback接口以及重写其中的created、changed和destroyed方法。对于画布Canvas的操作主要就是LOCK和UNLOCK