Android学习札记17：ImageView中的setImageBitmap()方法
16lz
2021-12-04
在4.0.4 r1.2中查看android.widget.ImageView源代码可以发现，setImageBitmap()方法其实是调用了setImageDrawable()方法进行重绘。
Sets a Bitmap as the content of this ImageView.Parameters:bm The bitmap to set@android.view.RemotableViewMethodpublic void setImageBitmap(Bitmap bm) {// if this is used frequently, may handle bitmaps explicitly// to reduce the intermediate drawable objectsetImageDrawable(new BitmapDrawable(mContext.getResources(), bm));}
Sets a drawable as the content of this ImageView.Parameters:drawable The drawable to setpublic void setImageDrawable(Drawable drawable) {if (mDrawable != drawable) {mResource = 0;mUri = null;int oldWidth = mDrawableWidth;int oldHeight = mDrawableHeight;updateDrawable(drawable);if (oldWidth != mDrawableWidth || oldHeight != mDrawableHeigh{requestLayout();}invalidate();}}
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