public Bitmap convertToBitmap(String path, int w, int h) {
BitmapFactory.Options opts = new BitmapFactory.Options();
// 设置为ture只获取图片大小
opts.inJustDecodeBounds = true;
opts.inPreferredConfig = Bitmap.Config.ARGB_8888;
// 返回为空
BitmapFactory.decodeFile(path, opts);
int width = opts.outWidth;
int height = opts.outHeight;
float scaleWidth = 0.f, scaleHeight = 0.f;
if (width > w || height > h) {
// 缩放
scaleWidth = ((float) width) / w;
scaleHeight = ((float) height) / h;
}
opts.inJustDecodeBounds = false;
float scale = Math.max(scaleWidth, scaleHeight);
opts.inSampleSize = (int)scale;
WeakReference<Bitmap> weak = new WeakReference<Bitmap>(BitmapFactory.decodeFile(path, opts));
return Bitmap.createScaledBitmap(weak.get(), w, h, true);
}
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其中w和h你需要转换的大小
path转换为bitmap:上面方法即可；
imageview获取drawable并转换为 bitmap ：Bitmap bt= ((BitmapDrawable) mImageview.getDrawable()).getBitmap();
resourceid转换为bitmap：Bitmap bt = BitmapFactory.decodeResource(getResources(), R.drawable.resourceid);
Drawable转换为bitmap：Bitmap bt= ((BitmapDrawable) Drawable).getBitmap();
因为BitmapDrawable是继承Drawable，所以可以灵活的转换