Permissions requests by dialog for Android 6.0 or later

PermissionDemoActivity.java

package ahmad.mostafa.permissiondemo;

import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

public class PermissionDemoActivity extends AppCompatActivity {

    private static String TAG = "PermissionDemo";
    private static final int RECORD_REQUEST_CODE = 101;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_permission_demo);

        // remember ! add permission to the Manifest file
        // like this " <uses-permission android:name="android.permission.RECORD_AUDIO"/> "
        int permission = ContextCompat.checkSelfPermission(this
                , Manifest.permission.RECORD_AUDIO);
        if ( permission != PackageManager.GET_PERMISSIONS )
        {
            Log.i(TAG, "Permission to record denied");

            // show the user why we need this permission by dialog
            if ( ActivityCompat.shouldShowRequestPermissionRationale(this
                    ,Manifest.permission.RECORD_AUDIO) )
            {
                AlertDialog.Builder builder = new  AlertDialog.Builder(this);
                builder.setTitle("Permission required");
                builder.setMessage("Permission to access the microphone is\n" +
                        "required for this app to record audio.");
                builder.setPositiveButton("ok" , new DialogInterface.OnClickListener(){

                    public void onClick(DialogInterface dialog, int id) {
                        Log.i(TAG, "Clicked");
                        makeRequest();
                    }
                });

                AlertDialog dialog = builder.create();
                dialog.show();

            }else {
                // check permission if 
                makeRequest();
            }
        }
    }

    protected void makeRequest(){
        ActivityCompat.requestPermissions(this
                , new String[]{Manifest.permission.RECORD_AUDIO}
                , RECORD_REQUEST_CODE);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode
            , @NonNull String[] permissions
            , @NonNull int[] grantResults) {
        switch (requestCode) {
            case RECORD_REQUEST_CODE: {
                if (grantResults.length == 0
                        || grantResults[0] !=
                        PackageManager.PERMISSION_GRANTED) {
                    Log.i(TAG, "Permission has been denied by user");
                } else {
                        Log.i(TAG, "Permission has been granted by user");
                }
                    return;
            }
        }
    }

}