bitmap - How to create resizable ImageView in Android -

i want user of app able modify image @ run time. user should able modify image height , width tapping on corner of image-view , dragging illustrated in following diagram:

i have spent lot of time researching , found making sense of multitouch , resize large bitmap file scaled output file pinch zoom none of these quite match requirements.

currently resizing bitmap using below finction , changing width in onprogress change method of seekbar instead of frame. using function changing image size not working smooth.

public static bitmap decodefile(file f,int width,int hight){      try {         //decode image size         bitmapfactory.options o = new bitmapfactory.options();         o.injustdecodebounds = true;         bitmapfactory.decodestream(new fileinputstream(f),null,o);          //the new size want scale         final int required_width=width;         final int required_hight=hight;          //find correct scale value. should power of 2.         int scale=1;         while(o.outwidth/scale/2>=required_width && o.outheight/scale/2>=required_hight)             scale*=2;          //decode insamplesize         bitmapfactory.options o2 = new bitmapfactory.options();         o2.insamplesize=scale;         return bitmapfactory.decodestream(new fileinputstream(f), null, o2);     }         catch (filenotfoundexception e) {}     return null;  } 

update :

now working smoothly using drawing bitmap in canvas using accepted answer of this question .

now reaming part setting frame around image crop frame.

please me achieve this.

you can accomplish using library use cropimageview3 , set image in float drawable , done