Why android File.delete() , File.rename() fails on some devices? -


it works on nexus 5,but not working on samsung devices , oem devices.

this code:

 file f = new file(path);         if (f.exists()) {              if (f.delete()) {                 mediascannerconnection.scanfile(ctx, new string[]{path, ""}, null, null);             } else {                 // log.e(tag, ctx.getstring(r.string.unabletodelete));             }          } else { toast.maketext(ctx,ctx.getstring(r.string.filenotfound),toast.length_short).show();         }

you need ask user if accept read/write permission

 if (activitycompat.checkselfpermission(this, manifest.permission.write_external_storage) != packagemanager.permission_granted) {             activitycompat.requestpermissions(this, new string[]{                     manifest.permission.read_external_storage,                     manifest.permission.write_external_storage,}, 1);         } else {             createtemporaryfile();         }

don't forget add 

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

i got issue device on api > 24 using file need disable uriexposure

     if(build.version.sdk_int>=24){         try{             method m = strictmode.class.getmethod("disabledeathonfileuriexposure");             m.invoke(null);         }catch(exception e){             e.printstacktrace();         }     }

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