我正在尝试使用以下方法在画布上叠加图像:
private Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
bmOverlay = Bitmap.createBitmap(70, 70, Bitmap.Config.RGB_565);
canvas = new Canvas(bmOverlay);
canvas.drawBitmap(bmp1, 0, 0, null); //line 179
canvas.drawBitmap(bmp2, 0, 0, null);
return bmOverlay;
}
然而,我的应用程序一直崩溃,日志显示:
java.lang.NullPointerException at android.graphics.Canvas.throwIfRecycled(Canvas.java:954) at android.graphics.Canvas.drawBitmap(Canvas.java:980) at com.MyApp.overlay(MyApp.java:179)
有人能帮忙吗?