在膨胀布局上调用measure时，空指针异常

在膨胀布局上调用measure时，空指针异常

measure()

抛出该错误的

Null Pointer Exception

原因是，当您为布局充气时，它不会读取布局的高度，宽度，属性。

只需在调用前

view.measure()

根据您使用的布局类型添加此行

v.measure（MeasureSpec.makeMeasureSpec（0，MeasureSpec.UNSPECIFIED），MeasureSpec.makeMeasureSpec（0，MeasureSpec.UNSPECIFIED））;

public Bitmap getBitmapFromView(RelativeLayout v) {        v.setLayoutParams(new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));        v.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));        v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());        Bitmap b = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(), Bitmap.Config.ARGB_8888);        Canvas c = new Canvas(b);        v.draw(c);        return b;    }