Android getResource() 未定义错误
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Android getResource() undefined error
提问by Jovan
I want to draw bitmap on draw method in MyPositionOverlay extends Overlay class but I get this error: The method getResource() is undefined for the type MyPositionOverlay
我想在 MyPositionOverlay extends Overlay 类中的 draw 方法上绘制位图，但出现此错误：方法 getResource() 未定义为 MyPositionOverlay 类型
Where I'm wrong?
我错在哪里？
Here is code form draw method:
这是代码形式的绘制方法：
Bitmap bmp = BitmapFactory.decodeResource(getResource(), R.drawable.icon);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);
Thanks
谢谢
回答by Frank
The getResources() method is not a member of the Overlay class. getResources() is a member of the Context class. You need to pass a reference of a Context to your Overlay subclass so that it can load the Drawable resource:
getResources() 方法不是 Overlay 类的成员。getResources() 是 Context 类的成员。您需要将 Context 的引用传递给 Overlay 子类，以便它可以加载 Drawable 资源：
Bitmap bmp = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon);
You also don't want to load a bitmap in your draw method as it is very memory intensive and will slow down your application, you should save a member variable of the bitmap in the constructor of the overlay so that it only gets loaded once.
您也不希望在 draw 方法中加载位图，因为它非常占用内存并且会减慢您的应用程序的速度，您应该在叠加层的构造函数中保存位图的成员变量，以便它只加载一次。
回答by Jorgesys
use
用
Bitmap bmp = BitmapFactory.decodeResource(this.getResources(), R.drawable.icon);
or
或者
Bitmap bmp = BitmapFactory.decodeResource(Context.getResources(), R.drawable.icon);
