绘制位图时未调用Android surfaceview oncreated
我在SurfaceView.updateWindow中遇到一个空指针异常,我想这是因为我在onDraw中,但从未收到surfaceCreated on the surface。所以有没有办法解决这个问题,或者在直接渲染到位图时强制调用surfacecreated 当在活动中添加为contentview时,此曲面视图将正确呈现。但实际上我想直接将surfaceview渲染为位图,而不在任何地方显示它 SurfaceView构造函数:绘制位图时未调用Android surfaceview oncreated,android,surfaceview,android-canvas,Android,Surfaceview,Android Canvas,我在SurfaceView.updateWindow中遇到一个空指针异常,我想这是因为我在onDraw中,但从未收到surfaceCreated on the surface。所以有没有办法解决这个问题,或者在直接渲染到位图时强制调用surfacecreated 当在活动中添加为contentview时,此曲面视图将正确呈现。但实际上我想直接将surfaceview渲染为位图,而不在任何地方显示它 SurfaceView构造函数: public ObservationDetailsGraphic
public ObservationDetailsGraphicView(Context context) {
super(context);
getHolder().addCallback(this);
}
SurfaceView onDraw:
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
LayoutInflater inflater = LayoutInflater.from(c);
View detailView = inflater.inflate(R.layout.observation_details_graphic_view,null);
detailView.setLayoutParams(new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
detailView.measure(bmWidth, bmHeight);
detailView.layout(0, 0, bmWidth, bmHeight);
detailView.draw(canvas); //null pointer exception here
}
呼叫代码:
Bitmap exportBitmap = Bitmap.createBitmap(640, 960, Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(exportBitmap);
ObservationDetailsGraphicView view = new ObservationDetailsGraphicView(this);
view.draw(canvas);
我在logcat中看不到任何相关内容,但以下是堆栈的相关部分:
ObservationDetailsGraphicView(SurfaceView).updateWindow(boolean, boolean) line: 473
ObservationDetailsGraphicView(SurfaceView).dispatchDraw(Canvas) line: 350
ObservationDetailsGraphicView(View).draw(Canvas) line: 6883
ObservationDetailsGraphicView(SurfaceView).draw(Canvas) line: 336
你面临什么问题。。在oncreate中,您正在创建surfaceview,因为它正在发生或通货膨胀中存在一些问题。您面临的问题是。。在oncreate中,您正在创建surfaceview,因为它正在发生或存在通货膨胀问题。。