6.0 Permissions

import Android. Manifest;import Android.app.activity;import Android.app.alertdialog;import Android.content.dialoginterface;import Android.content.pm.packagemanager;import Android.os.bundle;import Android.os.systemclock;import Android.util.Log; Import Android.view.view;import android.widget.button;import Android.widget.toast;import Java.io.File;import Java.io.ioexception;importStaticAndroid.content.ContentValues.TAG; Public classMainactivity extends Activity {PrivateButton Btn3; @Overrideprotected voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Btn3=(Button) Findviewbyid (R.ID.BTN3); Btn3.setonclicklistener (NewView.onclicklistener () {@Override Public voidOnClick (View v) {Boolean flag=permissionsutils.haspermission (mainactivity. This, Manifest.permission.WRITE_EXTERNAL_STORAGE); Final string[] Permissions_storage={Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_                External_storage}; if(Flag = =true) {WriteFile (); } Else {                    if(!Shouldshowrequestpermissionrationale (Manifest.permission.WRITE_EXTERNAL_STORAGE)) {Showmessageokcancel ("permission to read the store",                                NewDialoginterface.onclicklistener () {@Override /c6> Public voidOnClick (Dialoginterface Dialog,intwhich) {permissionsutils.requestpermission (mainactivity). This, Permissions_storage);                    }                                }                        ); } Else{permissionsutils.requestpermission (mainactivity). This, Permissions_storage); }                }            }            Private voidshowmessageokcancel (String message, Dialoginterface.onclicklistener oklistener) {NewAlertdialog.builder (mainactivity. This). Setmessage (Message). Setpositivebutton ("OK", Oklistener). Setnegativebutton ("Cancel",NULL). Create (). Show ();    }        }); } @Override Public voidOnrequestpermissionsresult (intRequestcode, string[] permissions,int[] grantresults) {        Switch(requestcode) { CasePermissionsutils.requestcode:if(grantresults[0] ==packagemanager.permission_granted) {                    //Permission grantedWriteFile (); } Else {                    //Permission DeniedToast.maketext ( This,"Deny authorization", Toast.length_short). Show (); }                 Break; default: Super.onrequestpermissionsresult (Requestcode, permissions, grantresults); }    }    Private voidWriteFile () {String fileName="ABC"+ systemclock.currentthreadtimemillis () +". txt"; File File=NewFile ("/storage/emulated/0/"+fileName); Try{file.createnewfile (); if(File.exists ()) {log.i (TAG,"WriteFile:"+File.getabsolutepath ()); }        } Catch(IOException e) {e.printstacktrace (); }    }    Private voidreadFile () {File file=NewFile ("/storage/emulated/0/blank_500_500.png"); if(File.exists ()) {log.i (TAG,"ReadFile:"+File.getabsolutepath ()); }    }}

Import Android.app.activity;import Android.content.pm.packagemanager;import Android.support.v4.app.ActivityCompat; Public classpermissionsutils {FinalStatic intRequestcode =111;  Public Static voidrequestpermission (activity activity, string[] permisssions) {activitycompat.requestpermissions (    Activity, permisssions, Requestcode); }     Public StaticBoolean haspermission (activity activity, String permission) {intPermissioncode =activitycompat.checkselfpermission (activity, permission); if(Permissioncode! =packagemanager.permission_granted) {            return false; } Else {            return true; }    }}

6.0 Permissions