<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.truiton.runtimepermissions"
          xmlns:android="http://schemas.android.com/apk/res/android">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

    if (ContextCompat.checkSelfPermission(MainActivity.this,
    Manifest.permission.WRITE_EXTERNAL_STORAGE) + ContextCompat
            .checkSelfPermission(MainActivity.this,
    Manifest.permission.READ_CONTACTS)
            != PackageManager.PERMISSION_GRANTED) {
        if (ActivityCompat.shouldShowRequestPermissionRationale
                (MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) ||
                ActivityCompat.shouldShowRequestPermissionRationale
                        (MainActivity.this, Manifest.permission.READ_CONTACTS)) {
            Snackbar.make(findViewById(android.R.id.content),
                    "Please Grant Permissions",
                    Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            ActivityCompat.requestPermissions(MainActivity.this,
                                    new String[]{Manifest.permission
                                            .WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_CONTACTS},
                                    REQUEST_PERMISSIONS);
                        }
                    }).show();
        } else {
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission
                            .WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_CONTACTS},
                    REQUEST_PERMISSIONS);
        }
    } else {
        //Call whatever you want
        myMethod();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String permissions[],
                                           @NonNull int[] grantResults) {
        switch (requestCode) {
            case REQUEST_PERMISSIONS: {
                if ((grantResults.length > 0) && (grantResults[0] +
                        grantResults[1]) == PackageManager.PERMISSION_GRANTED) {
                    //Call whatever you want
                    myMethod();
                } else {
                    Snackbar.make(findViewById(android.R.id.content), "Enable Permissions from settings",
                            Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                            new View.OnClickListener() {
                                @Override
                                public void onClick(View v) {
                                    Intent intent = new Intent();
                                    intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                    intent.addCategory(Intent.CATEGORY_DEFAULT);
                                    intent.setData(Uri.parse("package:" + getPackageName()));
                                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                    intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                                    intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
                                    startActivity(intent);
                                }
                            }).show();
                }
                return;
            }
        }
    }

package ir.zerotohero.runtimepermissions;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.SparseIntArray;
import android.view.View;

/**
 * Created by MG on 03-04-2016.
 */
public abstract class RuntimePermissionsActivity extends AppCompatActivity {
    private SparseIntArray mErrorString;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mErrorString = new SparseIntArray();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        int permissionCheck = PackageManager.PERMISSION_GRANTED;
        for (int permission : grantResults) {
            permissionCheck = permissionCheck + permission;
        }
        if ((grantResults.length > 0) && permissionCheck == PackageManager.PERMISSION_GRANTED) {
            onPermissionsGranted(requestCode);
        } else {
            Snackbar.make(findViewById(android.R.id.content), mErrorString.get(requestCode),
                    Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            Intent intent = new Intent();
                            intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                            intent.addCategory(Intent.CATEGORY_DEFAULT);
                            intent.setData(Uri.parse("package:" + getPackageName()));
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
                            startActivity(intent);
                        }
                    }).show();
        }
    }

    public void requestAppPermissions(final String[] requestedPermissions,
                                      final int stringId, final int requestCode) {
        mErrorString.put(requestCode, stringId);
        int permissionCheck = PackageManager.PERMISSION_GRANTED;
        boolean shouldShowRequestPermissionRationale = false;
        for (String permission : requestedPermissions) {
            permissionCheck = permissionCheck + ContextCompat.checkSelfPermission(this, permission);
            shouldShowRequestPermissionRationale = shouldShowRequestPermissionRationale || ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
        }
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            if (shouldShowRequestPermissionRationale) {
                Snackbar.make(findViewById(android.R.id.content), stringId,
                        Snackbar.LENGTH_INDEFINITE).setAction("GRANT",
                        new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                ActivityCompat.requestPermissions(RuntimePermissionsActivity.this, requestedPermissions, requestCode);
                            }
                        }).show();
            } else {
                ActivityCompat.requestPermissions(this, requestedPermissions, requestCode);
            }
        } else {
            onPermissionsGranted(requestCode);
        }
    }

    public abstract void onPermissionsGranted(int requestCode);
}

package ir.zerotohero.runtimepermissions;
 
import android.Manifest;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Toast;
 
public class MainActivity extends RuntimePermissionsActivity {
 
    private static final int REQUEST_PERMISSIONS = 20;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
 
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                MainActivity.super.requestAppPermissions(new
                                String[]{Manifest.permission.READ_CONTACTS,
                                Manifest.permission.WRITE_EXTERNAL_STORAGE}, R.string
                                .runtime_permissions_txt
                        , REQUEST_PERMISSIONS);
            }
        });
    }
 
    @Override
    public void onPermissionsGranted(final int requestCode) {
        Toast.makeText(this, "Permissions Received.", Toast.LENGTH_LONG).show();
    }
}