Taking screenshot of android returning Null? -

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i want take screenshot of screen of rooted device ( not of particular activity of whole screen ) code -

try {   process sh = runtime.getruntime().exec("su", null,null);             outputstream  os = sh.getoutputstream();             os.write(("/system/bin/screencap -p " + ""+mpath).getbytes("ascii"));             os.flush();             os.close();             sh.waitfor();      } catch (exception e)       {          log.e("tag_err", "error: "+e);        }

where

mpath= environment.getexternalstoragedirectory().tostring() + "/screenshots.png";

now trying display -

        try                  {             bitmap bmap = bitmapfactory.decodefile(""+mpath);             imageview image = (imageview)findviewbyid(r.id.imageview1);             image.setimagebitmap(bmap);             }             catch(exception e)             {                 log.e("tag_display_err","error : "+e);             }`

permissions :

<uses-permission android:name="android.permission.write_external_storage" />  <uses-permission android:name="android.permission.read_external_storage" />

but image not being dosplayed saying - unable decode stream - java.io.filenotfound exception .. searched in sdcard , there no file/image name screenshots.png .

why ? wrong code ? should ?

to save file can use 

      outputstream fout = null;                     file file = new file(directoyname,imagename);                         fout = new fileoutputstream(file);                      bitmap.compress(bitmap.compressformat.jpeg, 85, fout);                         fout.flush();                         fout.close();              mediastore.images.media.insertimage(getcontentresolver(),file.getabsolutepath(),file.getname(),file.getname());

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