allprojects {
    repositories {
        ...
        maven { url "https://maven.google.com" }
        maven { url "https://jitpack.io" }
    }
}

dependencies {
    implementation 'com.github.nguyenhoanglam:ImagePicker:2.0.0'
}

AssetPicker.with(this)                         //  Initialize ImagePicker with activity or fragment context
           .setToolbarColor("#212121")         //  Toolbar color
           .setStatusBarColor("#000000")       //  StatusBar color (works with SDK >= 21  )
           .setToolbarTextColor("#FFFFFF")     //  Toolbar text color (Title and Done button)
           .setToolbarIconColor("#FFFFFF")     //  Toolbar icon color (Back and Camera button)
           .setProgressBarColor("#4CAF50")     //  ProgressBar color
           .setBackgroundColor("#212121")      //  Background color
           .setCameraOnly(false)               //  Camera mode
           .setMultipleMode(true)              //  Select multiple images or single image
           .setFolderMode(true)                //  Folder mode
           .setIncludeVideos(true)             //  If the picker should include Videos or only Image Assets
           .setShowCamera(true)                //  Show camera button
           .setFolderTitle("Albums")           //  Folder title (works with FolderMode = true)
           .setImageTitle("Galleries")         //  Image title (works with FolderMode = false)
           .setDoneTitle("Done")               //  Done button title
           .setLimitMessage("You have reached selection limit")    // Selection limit message
           .setMaxSize(10)                     //  Max images can be selected
           .setSavePath("ImagePicker")         //  Image capture folder name
           .setSelectedImages(images)          //  Selected images
           .setAlwaysShowDoneButton(true)      //  Set always show done button in multiple mode
           .setRequestCode(100)                //  Set request code, default Config.RC_PICK_IMAGES
           .setKeepScreenOn(true)              //  Keep screen on when selecting images
           .start();                           //  Start ImagePicker    

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == Config.RC_PICK_ASSETS && resultCode == RESULT_OK && data != null) {
        ArrayList<Asset> assets = data.getParcelableArrayListExtra(Config.EXTRA_ASSETS);
        // Assets can be of type Image or Video, filter them here if needed, so your have a list of Images for example.
        // do your logic here...
    }
    super.onActivityResult(requestCode, resultCode, data);  // You MUST have this line to be here
                                                            // so ImagePicker can work with fragment mode
}