Permissions on Android M

PermissionHandlerActivity.java

/*
 * PermissionHandlerActivity.java
 *
 * Copyright (c) 2016 Auth0 (http://auth0.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.auth0.lock.util;

import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.PermissionChecker;

public abstract class PermissionHandlerActivity extends Activity implements ActivityCompat.OnRequestPermissionsResultCallback {

    private static final int PERMISSION_REQ_CODE = 324;

    /**
     * Checks if the given permission has been granted by the user to this application before.
     *
     * @param permission to check availability for
     * @return true if the permission is currently granted, false otherwise.
     */
    protected boolean isPermissionGranted(@NonNull String permission) {
        int result = ContextCompat.checkSelfPermission(this, permission);
        return result == PermissionChecker.PERMISSION_GRANTED;
    }

    /**
     * Starts the async request of the given permission.
     *
     * @param permission to request to the user
     */
    protected void requestPermission(@NonNull String permission) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
            //Show explanation dialog.
            //Optionally, call requestPermission again on positive button click
        } else {
            ActivityCompat.requestPermissions(this,
                    new String[]{permission},
                    PERMISSION_REQ_CODE);
        }
    }

    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode != PERMISSION_REQ_CODE || (permissions.length == 0 && grantResults.length == 0)) {
            return;
        }
        for (int i = 0; i < permissions.length; i++) {
            if (grantResults[i] == PermissionChecker.PERMISSION_GRANTED) {
                onPermissionGranted(permissions[i]);
            } else {
                onPermissionDenied(permissions[i]);
            }
        }
    }

    /**
     * Called when a permission request is accepted by the user.
     *
     * @param permission the user just accepted.
     */
    protected abstract void onPermissionGranted(String permission);

    /**
     * Called when a permission request is declined by the user.
     *
     * @param permission the user just declined.
     */
    protected abstract void onPermissionDenied(String permission);

}

PermissionHelper.java

/*
 * PermissionHelper.java
 *
 * Copyright (c) 2016 Auth0 (http://auth0.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.auth0.lock.util;

import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.PermissionChecker;

public class PermissionHelper implements ActivityCompat.OnRequestPermissionsResultCallback {

    private static final int PERMISSION_REQ_CODE = 324;

    private final Activity context;
    private final PermissionCallback callback;

    public PermissionHandler(@NonNull Activity context, @NonNull PermissionCallback callback) {
        this.context = context;
        this.callback = callback;
    }

    /**
     * Checks if the given permission has been granted by the user to this application before.
     *
     * @param permission to check availability for
     * @return true if the permission is currently granted, false otherwise.
     */
    public boolean isPermissionGranted(@NonNull String permission) {
        int result = ContextCompat.checkSelfPermission(context, permission);
        return result == PermissionChecker.PERMISSION_GRANTED;
    }

    /**
     * Starts the async request of the given permission.
     *
     * @param permission to request to the user
     */
    public void requestPermission(@NonNull String permission) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(context, permission)) {
            //Show explanation dialog.
            //Optionally, call requestPermission again on positive button click
        } else {
            ActivityCompat.requestPermissions(context,
                    new String[]{permission},
                    PERMISSION_REQ_CODE);
        }
    }

    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode != PERMISSION_REQ_CODE || (permissions.length == 0 && grantResults.length == 0)) {
            return;
        }
        for (int i = 0; i < permissions.length; i++) {
            if (grantResults[i] == PermissionChecker.PERMISSION_GRANTED) {
                callback.onPermissionGranted(permissions[i]);
            } else {
                callback.onPermissionDenied(permissions[i]);
            }
        }
    }

    public interface PermissionCallback {
        /**
         * Called when a permission request is accepted by the user.
         *
         * @param permission the user just accepted.
         */
        void onPermissionGranted(String permission);

        /**
         * Called when a permission request is declined by the user.
         *
         * @param permission the user just declined.
         */
        void onPermissionDenied(String permission);
    }
}

this methos never called when i accept Permission!!! Why?
public void onRequestPermissionsResult(int requestCode, @nonnull String[] permissions, @nonnull int[] grantResults)

@cliffgr You have to do it manually overriding onRequestPermissionsResult(...) in your Activity. Like this:

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    permissionHelper.onRequestPermissionsResult(requestCode, permissions, grantResults);
}