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我想用Xamarin opengl实现android LiveWallpaper。 但是当我激活LiveWallpaper时,GLSurfaceView在构造函数中抛出空引用异常。Xamarin OpenGL GLSurfaceView构造函数抛出空引用异常
错误行: 调用GLSurfaceView的基础构造函数时调用base(context)。
错误细节: 显示java.lang.NullPointerException:尝试上的空对象引用调用接口方法 '空隙android.view.SurfaceHolder.addCallback(android.view.SurfaceHolder $回调)'
[Service(Label = "@string/ApplicationName", Permission = "android.permission.BIND_WALLPAPER")]
[IntentFilter(new[] { "android.service.wallpaper.WallpaperService" })]
[MetaData("android.service.wallpaper", Resource = "@layout/MyLiveWallpaper")]
public class OpenGLWallpaperService : WallpaperService
{
public override Engine OnCreateEngine()
{
return new OpenGLWallpaperEngine(this);
}
public class OpenGLWallpaperEngine : Engine
{
private readonly OpenGLWallpaperService _serviceInstance;
public OpenGLWallpaperView GLWallpaperView { get; set; }
public OpenGLWallpaperEngine(OpenGLWallpaperService serviceInstance)
: base(serviceInstance)
{
_serviceInstance = serviceInstance;
}
public override void OnCreate(ISurfaceHolder surfaceHolder)
{
base.OnCreate(surfaceHolder);
GLWallpaperView = new OpenGLWallpaperView(this, _serviceInstance, surfaceHolder);
}
}
}
public class OpenGLWallpaperView : GLSurfaceView
{
private readonly OpenGLWallpaperService.OpenGLWallpaperEngine _engineInstance;
public override ISurfaceHolder Holder { get; }
public OpenGLWallpaperView(OpenGLWallpaperService.OpenGLWallpaperEngine engineInstance,
Context context, ISurfaceHolder surfaceHolder)
: base(context)
{
_engineInstance = engineInstance;
Holder = surfaceHolder;
}
}