Edit and sync features

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Sample viewer app

Synchronize offline edits with a feature service.

screenshot

Use case

A survey worker who works in an area without an internet connection could take a geodatabase of survey features offline at their office, make edits and add new features to the offline geodatabase in the field, and sync the updates with the online feature service after returning to the office.

How to use the sample

Pan and zoom to position the red rectangle around the area you want to take offline. Click "Generate geodatabase" to take the area offline. When complete, the map will update to only show the offline area. To edit features, click to select a feature, and click again anywhere else on the map to move the selected feature to the clicked location. To sync the edits with the feature service, click the "Sync geodatabase" button.

How it works

  1. Create a GeodatabaseSyncTask from a URL to a feature service.
  2. Create GenerateGeodatabaseParameters, passing in an Envelope extent as the parameter.
  3. Create a GenerateGeodatabaseJob from the GeodatabaseSyncTask using generateGeodatabase(...), passing in the parameters and a path to where the geodatabase should be downloaded locally.
  4. Start the job and get the result Geodatabase.
  5. Load the geodatabase and get its feature tables. Create feature layers from the feature tables and add them to the map's operational layers collection.
  6. Create SyncGeodatabaseParameters and set the sync direction.
  7. Create a SyncGeodatabaseJob from GeodatabaseSyncTask using syncGeodatabase(...) passing in the parameters and geodatabase as arguments.
  8. Start the sync job to synchronize the edits.

Relevant API

  • FeatureLayer
  • FeatureTable
  • GenerateGeodatabaseJob
  • GenerateGeodatabaseParameters
  • GeodatabaseSyncTask
  • SyncGeodatabaseJob
  • SyncGeodatabaseParameters
  • SyncLayerOption

Offline Data

Read more about how to set up the sample's offline data here.

Link Local Location
San Francisco Streets TPK <userhome>/ArcGIS/Runtime/Data/tpk/SanFrancisco.tpk

About the data

The basemap uses an offline tile package of San Francisco. The online feature service has features with wildfire information.

Tags

feature service, geodatabase, offline, synchronize

Sample Code

EditAndSyncFeatures.qmlEditAndSyncFeatures.cppEditAndSyncFeatures.h
                                                                                                                                                                                                                     
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// [WriteFile Name=EditAndSyncFeatures, Category=EditData]
// [Legal]
// Copyright 2016 Esri.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]

import QtQuick 2.6
import QtQuick.Controls 2.2
import QtGraphicalEffects 1.0
import Esri.Samples 1.0

EditAndSyncFeaturesSample {
    id: editAndSyncSample
    clip: true
    width: 800
    height: 600

    property string statusText: ""
    property string instructionText: ""
    property alias isOffline: editAndSyncSample.isOffline
    property var selectedFeature: null

    // add a mapView component
    MapView {
        anchors.fill: parent
        objectName: "mapView"
    }

    onHideWindow: {
        syncWindow.hideWindow(time);

        if (success) {
            extentRectangle.visible = false;
            syncButton.visible = false;
        }
    }

    onUpdateInstruction: {
        instructions.visible = true;
        instructionText = instruction;
    }

    onShowButton: syncButton.visible = true;

    onUpdateStatus: statusText = status;

    // create an extent rectangle for the output geodatabase
    Rectangle {
        id: extentRectangle
        anchors.centerIn: parent
        width: parent.width - (50)
        height: parent.height - (125)
        color: "transparent"
        border {
            color: "red"
            width: 3
        }
    }

    // Create the button to generate/sync geodatabase
    Rectangle {
        id: syncButton
        property bool pressed: false
        anchors {
            horizontalCenter: parent.horizontalCenter
            bottom: parent.bottom
            bottomMargin: 23
        }

        width: isOffline ? 175 : 200
        height: 35
        color: pressed ? "#959595" : "#D6D6D6"
        radius: 8
        border {
            color: "#585858"
            width: 1
        }

        Row {
            anchors.fill: parent
            spacing: 5
            Image {
                width: 38
                height: width
                source: isOffline ? "qrc:/Samples/EditData/EditAndSyncFeatures/sync.png" : "qrc:/Samples/EditData/EditAndSyncFeatures/download.png"
            }

            Text {
                anchors.verticalCenter: parent.verticalCenter
                text: isOffline ? "Sync Geodatabase" : "Generate Geodatabase"
                font.pixelSize: 14
                color: "#474747"
            }
        }

        MouseArea {
            anchors.fill: parent
            onPressed: syncButton.pressed = true
            onReleased: syncButton.pressed = false
            onClicked: {
                if (isOffline) {
                    instructions.visible = false;
                    editAndSyncSample.executeSync();
                    syncWindow.visible = true;
                } else {
                    editAndSyncSample.generateGeodatabaseFromCorners(extentRectangle.x, extentRectangle.y, (extentRectangle.x + extentRectangle.width), (extentRectangle.y + extentRectangle.height));
                    syncWindow.visible = true;
                }
            }
        }
    }

    // Create a bar to display editing instructions
    Rectangle {
        id: instructions
        anchors {
            top: parent.top
            left: parent.left
            right: parent.right
        }
        height: 25
        color: "gray"
        opacity: 0.9
        visible: false

        Text {
            anchors.centerIn: parent
            text: instructionText
            font.pixelSize: 16
            color: "white"
        }
    }

    // Create a window to display the generate/sync window
    Rectangle {
        id: syncWindow
        anchors.fill: parent
        color: "transparent"
        clip: true
        visible: false

        RadialGradient {
            anchors.fill: parent
            opacity: 0.7
            gradient: Gradient {
                GradientStop { position: 0.0; color: "lightgrey" }
                GradientStop { position: 0.7; color: "black" }
            }
        }

        MouseArea {
            anchors.fill: parent
            onClicked: mouse.accepted = true
            onWheel: wheel.accepted = true
        }

        Rectangle {
            anchors.centerIn: parent
            width: 125
            height: 100
            color: "lightgrey"
            opacity: 0.8
            radius: 5
            border {
                color: "#4D4D4D"
                width: 1
            }

            Column {
                anchors {
                    fill: parent
                    margins: 10
                }
                spacing: 10

                BusyIndicator {
                    anchors.horizontalCenter: parent.horizontalCenter
                }

                Text {
                    anchors.horizontalCenter: parent.horizontalCenter
                    text: statusText
                    font.pixelSize: 16
                }
            }
        }

        Timer {
            id: hideWindowTimer

            onTriggered: {
                syncWindow.visible = false;
                instructions.visible = true;
                instructionText = "Tap on a feature";
            }
        }

        function hideWindow(time) {
            hideWindowTimer.interval = time;
            hideWindowTimer.restart();
        }
    }
}

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