Update to compileSdkVersion 28 to fix build

build:

  stage: build

  script:

  - ./gradlew build -x test

  - ./gradlew assemble

  artifacts:

    paths:

    - app/build/outputs/apk/

android {

    compileSdkVersion 26

    compileSdkVersion 28

    defaultConfig {

        applicationId "foundation.e.drive"

        minSdkVersion 26

    androidTestImplementation 'com.android.support.test:runner:1.0.2'

    androidTestImplementation 'com.android.support.test:rules:1.0.2'

    androidTestImplementation 'com.android.support:support-annotations:27.1.1'

    androidTestImplementation 'androidx.annotation:annotation:1.3.0'

    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

    api 'com.android.support:support-annotations:27.1.1'

    api 'androidx.annotation:annotation:1.3.0'

    api project(':NextcloudLib')

    //start to add lib for test - 1/4/21

import android.content.Context;

import android.os.Parcel;

import android.os.Parcelable;

import android.support.annotation.VisibleForTesting;

import android.util.Log;

import androidx.annotation.VisibleForTesting;

import com.owncloud.android.lib.common.OwnCloudClient;

import com.owncloud.android.lib.common.UserInfo;

import com.owncloud.android.lib.common.operations.RemoteOperation;

import android.content.ContentValues;

import android.database.Cursor;

import android.net.Uri;

import android.support.annotation.NonNull;

import android.support.annotation.Nullable;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

import android.content.ContentValues;

import android.database.Cursor;

import android.net.Uri;

import android.support.annotation.NonNull;

import android.support.annotation.Nullable;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

 *