Android Runtime Permission Demo in Android

package com.onecommunity;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Message;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.telephony.TelephonyManager;
import android.view.View;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.messaging.FirebaseMessaging;
import com.onecommunity.Font.Font;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.UUID;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class RuntimePermission extends Activity {

    final private int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_home);
     


        TelephonyManager telephonyManager;
        telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        deviceId = telephonyManager.getDeviceId();

//        String str = Build.ID;
        String str = UUID.randomUUID().toString();
    }

    //permission access
    private void openRun() {
        if (Build.VERSION.SDK_INT >= 23) {
            insertDummyContactWrapper();
// Marshmallow+
        } else {
// Pre-Marshmallow
        }
    }

    private void insertDummyContactWrapper() {
        List<String> permissionsNeeded = new ArrayList<String>();

        final List<String> permissionsList = new ArrayList<String>();
        if (!addPermission(permissionsList, android.Manifest.permission.CAMERA))
            permissionsNeeded.add("Camera");
        if (!addPermission(permissionsList, android.Manifest.permission.READ_EXTERNAL_STORAGE))
            permissionsNeeded.add("Read Storage");
        if (!addPermission(permissionsList, android.Manifest.permission.WRITE_EXTERNAL_STORAGE))
            permissionsNeeded.add("Write Storage");
        if (!addPermission(permissionsList, Manifest.permission.READ_PHONE_STATE))
            permissionsNeeded.add("Read Phone State");


        if (permissionsList.size() > 0) {
            if (permissionsNeeded.size() > 0) {
// Need Rationale
                String message = "You need to grant access to " + permissionsNeeded.get(0);
                for (int i = 1; i < permissionsNeeded.size(); i++)
                    message = message + ", " + permissionsNeeded.get(i);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),
                            REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
                }
                return;
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),
                        REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
            }
            return;
        }
    }

    private boolean addPermission(List<String> permissionsList, String permission) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
                permissionsList.add(permission);
// Check for Rationale Option
                if (!shouldShowRequestPermissionRationale(permission))
                    return false;
            }
        }
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: {
                Map<String, Integer> perms = new HashMap<String, Integer>();
// Initial
                perms.put(android.Manifest.permission.CAMERA, PackageManager.PERMISSION_GRANTED);
                perms.put(android.Manifest.permission.READ_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
                perms.put(android.Manifest.permission.WRITE_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
                perms.put(Manifest.permission.READ_PHONE_STATE, PackageManager.PERMISSION_GRANTED);
// Fill with results
                for (int i = 0; i < permissions.length; i++)
                    perms.put(permissions[i], grantResults[i]);
// Check for ACCESS_FINE_LOCATION
                if (perms.get(android.Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED
                        && perms.get(android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
                        && perms.get(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
                        && perms.get(Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED) {


// All Permissions Granted
                } else {
// Permission Denied
                    openRun();
                    Intent intent = new Intent();
                    intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                    Uri uri = Uri.fromParts("package", LanguageSelectionActivity.this.getPackageName(), null);
                    intent.setData(uri);
                    LanguageSelectionActivity.this.startActivity(intent);
                    Toast.makeText(LanguageSelectionActivity.this, "Please Allow All Permissions", Toast.LENGTH_LONG);
//                    finish();
                }
            }
            break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}