A helper class to make Android run time permission a little easier.

PermissionsHelper.java

import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.provider.Settings;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.view.View;

/**
 * A helper class to make run time permission a little easier.
 *
 * To bind the PermissionHelper with the activity you need to
 * call PermissionsHelper.onRequestPermissionsResult() from the Activity.onRequestPermissionsResult()
 *
 * Depending on which PermissionsHelper.requestPermission() flavor is used,
 * an AlertDialog for manual permission enable in application Settings will be displayed on denial (or not).
 *
 */
public class PermissionsHelper {

    private static final int REQ_PERMISSION = 0x1337;

    private Activity mActivity;
    private int mSettingsPromptResId;

    public PermissionsHelper(Activity activity) {
        this.mActivity = activity;
    }

    /**
     * @param manifestPermission Manifest.permission.*
     * @param rationaleResId will be displayed in a Snackbar to inform the user about needed permission
     */
    public void requestPermission(final String manifestPermission, int rationaleResId) {
        requestPermission(manifestPermission, rationaleResId, -1);
    }


    /**
     * @param manifestPermission Manifest.permission.*
     * @param rationaleResId will be displayed in a Snackbar to inform the user about needed permission
     * @param settingsPromptResId will be displayed in an AlertDialog to prompt the user to enable permission manually from application settings
     */
    public void requestPermission(final String manifestPermission, int rationaleResId, int settingsPromptResId) {
        this.mSettingsPromptResId = settingsPromptResId;
        if (ContextCompat.checkSelfPermission(mActivity, manifestPermission) != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(mActivity, manifestPermission)) {

                Snackbar.make(mActivity.findViewById(android.R.id.content), rationaleResId, Snackbar.LENGTH_INDEFINITE)
                        .setAction(android.R.string.ok, new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {
                                ActivityCompat.requestPermissions(mActivity, new String[]{manifestPermission}, REQ_PERMISSION);
                            }
                        })
                        .show();
            } else {

                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(mActivity, new String[]{manifestPermission}, REQ_PERMISSION);
            }
        }
    }

    public boolean onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case REQ_PERMISSION: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    return true;

                } else {
                    if(mSettingsPromptResId > 0) {
                        new AlertDialog.Builder(mActivity)
                                .setMessage(mSettingsPromptResId)
                                .setPositiveButton(R.string.permission_helper_settings, new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog, int which) {
                                        Intent intent = new Intent();
                                        intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                        Uri uri = Uri.fromParts("package", mActivity.getPackageName(), null);
                                        intent.setData(uri);
                                        mActivity.startActivity(intent);
                                    }
                                }).setNegativeButton(android.R.string.cancel, null)
                                .show();
                    }
                }
            }
        }
        return false;
    }
}