http://blog.sina.com.cn/s/blog_4b93170a0102e1m9.html
//调用setCompoundDrawables时，必须调用Drawable.setBounds()方法,否则图片不显示 最主要一点，不然不显示图片，搞了半天
/**
* 从png文件得到Bitmap
* 并且将尺寸调整为宽=w、高=h
*/
public static Bitmap getMyBitmap(String imageName, int w, int h){
String filePath = IMAGE_PATH + "/" + imageName + ".png";
Bitmap oldbmp = BitmapFactory.decodeFile(filePath);
if(oldbmp!=null){
int width = oldbmp.getWidth();
int height = oldbmp.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) w / width);
float scaleHeight = ((float) h / height);
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height, matrix, true);
return newbmp;
}
else{
return null;
}
}
调整分辨率
http://blog.sina.com.cn/s/blog_4607d856010125sl.html BitmapDrawable的使用转换