space-android/src/main/java/com/owncloud/android/utils/PermissionUtil.java

package com.owncloud.android.utils;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;

/**
 * Created by scherzia on 29.12.2015.
 */
public class PermissionUtil {
    public static final int PERMISSIONS_WRITE_EXTERNAL_STORAGE = 1;
    public static final int PERMISSIONS_READ_CONTACTS_AUTOMATIC = 2;
    public static final int PERMISSIONS_READ_CONTACTS_MANUALLY = 3;
    public static final int PERMISSIONS_WRITE_CONTACTS = 4;

    /**
     * Wrapper method for ContextCompat.checkSelfPermission().
     * Determine whether <em>the app</em> has been granted a particular permission.
     *
     * @param permission The name of the permission being checked.
     * @return <code>true</code> if app has the permission, or <code>false</code> if not.
     */
    public static boolean checkSelfPermission(Context context, String permission) {
        return ContextCompat.checkSelfPermission(context, permission)
                == android.content.pm.PackageManager.PERMISSION_GRANTED;
    }

    /**
     * Wrapper method for ActivityCompat.shouldShowRequestPermissionRationale().
     * Gets whether you should show UI with rationale for requesting a permission.
     * You should do this only if you do not have the permission and the context in
     * which the permission is requested does not clearly communicate to the user
     * what would be the benefit from granting this permission.
     *
     * @param activity   The target activity.
     * @param permission A permission to be requested.
     * @return Whether to show permission rationale UI.
     */
    public static boolean shouldShowRequestPermissionRationale(Activity activity, String permission) {
        return ActivityCompat.shouldShowRequestPermissionRationale(activity, permission);
    }

    /**
     * request the write permission for external storage.
     *
     * @param activity The target activity.
     */
    public static void requestWriteExternalStoreagePermission(Activity activity) {
        ActivityCompat.requestPermissions(activity,
                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                PERMISSIONS_WRITE_EXTERNAL_STORAGE);
    }
}