ImageView根据宽高完整显示图片

本文主要是介绍ImageView根据宽高完整显示图片，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

根据图片的宽高和ImageView的宽高，实现图片不压缩、不裁剪显示图片。

自定义控件继承ImageView,在onDraw中计算图片和控件的宽高比，按最小的宽高比进行缩放。

 @Overrideprotected void onDraw(Canvas canvas) {Drawable drawable = getDrawable();if (drawable == null) {return;}if (getWidth() == 0 || getHeight() == 0) {return;}this.measure(0, 0);if (drawable.getClass() == NinePatchDrawable.class) {return;} else if (drawable instanceof AsyncDrawable) {return;}Bitmap b = ((BitmapDrawable) drawable).getBitmap();Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);if (bitmap.getWidth() == 0 || bitmap.getHeight() == 0) {return;}if (defaultWidth == 0) {defaultWidth = getWidth();}if (defaultHeight == 0) {defaultHeight = getHeight();}float scaleHeght = (float) defaultHeight / (float) bitmap.getHeight();float scaleWight = (float) defaultWidth / (float) bitmap.getWidth();if (scaleHeght >= scaleWight) {scale = scaleWight;} else {scale = scaleHeght;}
//        scale = (float) defaultHeight / (float) bitmap.getHeight();defaultWidth = Math.round(bitmap.getWidth() * scale);defaultHeight = Math.round(bitmap.getHeight() * scale);LayoutParams params = this.getLayoutParams();params.width = defaultWidth;params.height = defaultHeight;this.setLayoutParams(params);super.onDraw(canvas);}

这篇关于ImageView根据宽高完整显示图片的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---