Creating a MapView and Waypoint Application

2019-01-31v4.9Github

If you come across any mistakes or bugs in this tutorial, please let us know by sending emails to dev@dji.com. Please feel free to send us Github pull request and help us fix any issues.


In this tutorial, you will learn how to implement the DJIWaypoint Mission feature and get familiar with the usages of MissionControl. Also you will know how to test the Waypoint Mission API with DJI Assistant 2 Simulator too. So let's get started!

You can download the tutorial's final sample project from this Github Page.

Note: In this tutorial, we will use Mavic Pro for testing, use Android Studio 2.1.1 for developing the demo application, and use the Gaode Map API for navigating.

Preparation

Download the SDK

You can download the latest Android SDK from here: https://developer.dji.com/mobile-sdk/downloads.

Setup Android Development Environment

Throughout this tutorial we will be using Android Studio 3.0, which you can download from here: http://developer.android.com/sdk/index.html.

Application Activation and Aircraft Binding in China

For DJI SDK mobile application used in China, it's required to activate the application and bind the aircraft to the user's DJI account.

If an application is not activated, the aircraft not bound (if required), or a legacy version of the SDK (< 4.1) is being used, all camera live streams will be disabled, and flight will be limited to a zone of 100m diameter and 30m height to ensure the aircraft stays within line of sight.

To learn how to implement this feature, please check this tutorial Application Activation and Aircraft Binding.

Implementing the UI of Application

We can use the map view to display waypoints and show the flight route of the aircraft when waypoint mission is being executed. Here, we take Gaode Map for an example.

Configurating AMAP API Key

1. Create the project

Open Android Studio and select File -> New -> New Project to create a new project, named "GSDemo". Enter the company domain and package name (Here we use "com.dji.GSDemo.GaodeMap") you want and press Next. Set the mimimum SDK version as API 19: Android 4.4 (KitKat) for "Phone and Tablet" and press Next. Then select "Empty Activity" and press Next. Lastly, leave the Activity Name as "MainActivity", and the Layout Name as "activity_main", Press "Finish" to create the project.

2. Generating SHA-1 Key

We can use Android Studio to generate a SHA-1 Key easily. Click on the Gradle tap on the right side of Android Studio. Select the project and navigate to Tasks -> android -> signingReport.

signingReport

Then double click the signingReport and check the Console area of Android Studio, you can find the SHA-1 key easily:

SHA1

3. Applying for an AMAP Key

Now, let's go to AMAP Developer Platform to apply for an AMAP Key. If it's your first time go to this website, please register first. Then login with your amap account and press the "+创建新应用" button on the upper right corner. Enter your application's name and press "创建" to continue. You will see the following screenshot here:

createApplication

Next, click the "添加新Key" button on the upper right corner of "GSDemo" Application. Enter the info as you want, for the "发布版安全码:SHA1" and "调试版安全码SHA1" fields, please enter the SHA-1 key we just generate in the above steps.

createAMAPKey

Note: The "Package" should be the same to your Android project's Package name.

Moreover, press "提交" and you can get your AMAP Key like this:

AMAPKey

4. Adding AMAP Key

Open the AndroidManifest.xml file, add the following elements as childs of element and substitute your AMAP Key for "YOUR _ AMAP_KEY" in the value attribute as shown below:

<!-- 启用高德地图服务 -->
<meta-data
android:name="com.amap.api.v2.apikey"
android:value="YOUR_AMAP_KEY" />

This will set the key "com.amap.api.v2.apikey" to the value of your AMAP key.

Next, specify the permissions of your application needs, by adding <uses-permission> elements as children of the <manifest> element in the "AndroidManifest.xml" file.

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />

For more details of description on the permissions, please refer to http://lbs.amap.com/api/android-sdk/guide/create-project/dev-attention.

Importing the AMAP JAR Packages

Let's go to http://lbs.amap.com/api/android-sdk/down/ to download the latest version of AMAP Android's 2D Map SDK and search service SDK as shown below:

amapSDK

Once you finish the download, copy the two SDK jar files to the libs folder of your Android Studio project: app->libs.

Then right click on the app folder in the project navigator and select "Open Module Settings" to open the "Project Structure" window.

openModuleSettings

Next, press the "+" button on the upper left corner of the window and select "Import .JAR/.ARR Package", and press "Next" button. Moreover, select the amap packages in the "File name" field of the "Create New Module" window as shown below:

selectLibsPackage

Then press "Finish" button to import the AMap_2DMap JAR package:

createNewModule

Repeart this process again to import the AMap_Search JAR package. Wait until the Sync Gradle Files finish. If everything goes well, when you open the "build.gradle(Module: app)" file, you should see the two AMap JAR packages included in the "dependencies" part:

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile project(':AMap_2DMap_V2.8.1_20160202')
compile project(':AMap_Search_V3.2.1_20160308')
}

Importing the Maven Dependency

You can check the Integrate SDK into Application tutorial to learn how to import the Android SDK Maven Dependency.

Building the Layouts of MainActivity

1. Working on the MApplication, DJIDemoApplication and ConnectionActivity

Please check the Creating an Camera Application tutorial and the sample project of this tutorial for the detailed implementations of MApplication and DJIDemoApplication.

To improve the user experience, we had better create an activity to show the connection status between the DJI Product and the SDK, once it's connected, the user can press the OPEN button to enter the MainActivity. You can also check the Creating an Camera Application tutorial to learn how to implement the ConnectionActivity Class and Layout in this project.

2. Implementing the MainActivity Layout

Open the activity_main.xml layout file and replace the code with the following:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#FFFFFF"
tools:context="com.dji.GSDemo.GaodeMap.MainActivity">


<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<TextView
android:id="@+id/ConnectStatusTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GSDemo"
android:gravity="center"
android:textColor="#000000"
android:textSize="21sp"
/>

</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<Button
android:id="@+id/locate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Locate"
android:layout_weight="1"/>

<Button
android:id="@+id/add"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Add"
android:layout_weight="1"/>

<Button
android:id="@+id/clear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Clear"
android:layout_weight="1"/>

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<Button
android:id="@+id/config"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Config"
android:layout_weight="0.9"/>

<Button
android:id="@+id/upload"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Upload"
android:layout_weight="0.9"/>

<Button
android:id="@+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Start"
android:layout_weight="1"/>

<Button
android:id="@+id/stop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Stop"
android:layout_weight="1"/>

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">

<com.amap.api.maps2d.MapView
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</LinearLayout>

</LinearLayout>

In the xml file, we implement the following UIs:

  1. Create a LinearLayout to show a TextView with "GSDemo" title and put it on the top.

  2. Create two lines of Buttons: "LOCATE", "ADD", "CLEAR", "CONFIG", "UPLOAD", "START" and "STOP", place them horizontally.

  3. Lastly, we create a map view fragment and place it at the bottom.

Next, copy the "aircraft.png" and "ic_launcher.png" image files from this tutorial's Github sample project to the drawable folders inside the res folder.

Furthermore, open the AndroidManifest.xml file and update the ".MainActivity" activity element with several attributes as shown below:

<activity
android:name=".MainActivity"
android:configChanges="orientation|screenSize"
android:label="@string/title_activity_mainactivity"
android:screenOrientation="landscape"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >

<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Now, if you check the "activity_main.xml" file, you should see the preview screenshot of MainActivity as shown below:

MainActivity

Lastly, let's create a new xml file named "dialog_waypointsetting.xml" in the layout folder by right-clicking on the "layout" folder and select New->XML->Layout XML File. Then replace the code with the same file in this project's Github sample project, since the content is too much, we don't show them all here.

This xml file will help to setup a textView to enter "Altitude" and create three RadioButton Groups for selecting Speed, Action After Finished and Heading.

Now, if you check the dialog_waypointsetting.xml file, you can see the preview screenshot of Waypoint Configuration Dialog as shown below:

MainActivity

3. Working on the MainActivity Class

Let's come back to the MainActivity.java class, and replace the code with the following, remember to import the related classes as Android Studio suggested:

public class MainActivity extends FragmentActivity implements View.OnClickListener, OnMapClickListener {

protected static final String TAG = "MainActivity";

private MapView mapView;
private AMap aMap;

private Button locate, add, clear;
private Button config, upload, start, stop;

@Override
protected void onResume(){
super.onResume();
}

@Override
protected void onPause(){
super.onPause();
}

@Override
protected void onDestroy(){
super.onDestroy();
}

/**
* @Description : RETURN BTN RESPONSE FUNCTION
*/

public void onReturn(View view){
Log.d(TAG, "onReturn");
this.finish();
}

private void initUI() {
locate = (Button) findViewById(R.id.locate);
add = (Button) findViewById(R.id.add);
clear = (Button) findViewById(R.id.clear);
config = (Button) findViewById(R.id.config);
upload = (Button) findViewById(R.id.upload);
start = (Button) findViewById(R.id.start);
stop = (Button) findViewById(R.id.stop);

locate.setOnClickListener(this);
add.setOnClickListener(this);
clear.setOnClickListener(this);
config.setOnClickListener(this);
upload.setOnClickListener(this);
start.setOnClickListener(this);
stop.setOnClickListener(this);
}

private void initMapView() {

if (aMap == null) {
aMap = mapView.getMap();
aMap.setOnMapClickListener(this);// add the listener for click for amap object
}

LatLng shenzhen = new LatLng(22.5362, 113.9454);
aMap.addMarker(new MarkerOptions().position(shenzhen).title("Marker in Shenzhen"));
aMap.moveCamera(CameraUpdateFactory.newLatLng(shenzhen));
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mapView = (MapView) findViewById(R.id.map);
mapView.onCreate(savedInstanceState);

initMapView();
initUI();

}

private void showSettingDialog(){
LinearLayout wayPointSettings = (LinearLayout)getLayoutInflater().inflate(R.layout.dialog_waypointsetting, null);

final TextView wpAltitude_TV = (TextView) wayPointSettings.findViewById(R.id.altitude);
RadioGroup speed_RG = (RadioGroup) wayPointSettings.findViewById(R.id.speed);
RadioGroup actionAfterFinished_RG = (RadioGroup) wayPointSettings.findViewById(R.id.actionAfterFinished);
RadioGroup heading_RG = (RadioGroup) wayPointSettings.findViewById(R.id.heading);

speed_RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
Log.d(TAG, "Select Speed finish");
}
});

actionAfterFinished_RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
Log.d(TAG, "Select action action");
}
});

heading_RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
Log.d(TAG, "Select heading finish");
}
});

new AlertDialog.Builder(this)
.setTitle("")
.setView(wayPointSettings)
.setPositiveButton("Finish",new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id) {
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
})
.create()
.show();
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.config:{
showSettingDialog();
break;
}
default:
break;
}
}

@Override
public void onMapClick(LatLng point) {
}
}

In the code shown above, we implement the following features:

1. Create MapView and AMap variables and 7 Button member variables for the UI. Then create the initUI() method to init the 7 Button variables and implement their setOnClickListener method and pass "this" as parameter.

2. In the onCreate() method, we request several permissions at runtime to ensure the SDK works well when the compile and target SDK version is higher than 22(Like Android Marshmallow 6.0 device and API 23).

3. Then invoke the initUI() method to initialize the UI. Then invoke the initMapView() method to create the MapView and add a marker of Shenzhen, China here. So when the Gaode map is loaded, you will see a blue pin tag on Shenzhen, China.

4. Implement the showSettingDialog method to show the Waypoint Configuration alert dialog and override the onClick() method to show the configuration dialog when press the Config button.

Registering your Application

1. Modifying AndroidManifest file

After you finish the above steps, let's register our application with the App Key you apply from DJI Developer Website. If you are not familiar with the App Key, please check the Get Started.

1. Let's open the "AndroidManifest.xml" file and add the following elements to it:

<uses-feature
android:name="android.hardware.usb.host"
android:required="false" />

<uses-feature
android:name="android.hardware.usb.accessory"
android:required="true" />

Here, because not all Android-powered devices are guaranteed to support the USB accessory and host APIs, include two elements that declares that your application uses the "android.hardware.usb.accessory" and "android.hardware.usb.host" feature.

Then add the following elements above the MainActivity activity element:

<!-- DJI SDK -->

<uses-library android:name="com.android.future.usb.accessory" />
<meta-data
android:name="com.dji.sdk.API_KEY"
android:value="Please enter your App Key here." />


<!-- 启用高德地图服务 -->
<meta-data
android:name="com.amap.api.v2.apikey"
android:value="YOUR_AMAP_KEY" />


<activity
android:name="dji.sdk.sdkmanager.DJIAoaControllerActivity"
android:theme="@android:style/Theme.Translucent" >

<intent-filter>
<action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
</intent-filter>

<meta-data
android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
android:resource="@xml/accessory_filter" />

</activity>
<service android:name="dji.sdk.sdkmanager.DJIGlobalService" >
</service>

<!-- DJI SDK -->

In the code above, we enter the App Key of the application in the value part of android:name="com.dji.sdk.API_KEY" attribute. For more details of the AndroidManifest.xml file, please check the Github source code of the demo project.

2. Implementing Registration in DJIDemoApplication and ConnectionActivity

Since we have implemented the registration logics in the "DJIDemoApplication.java" and "ConnectionActivity.java" files previously, we don't explain the details here.

Now let's build and run the project and install it to your Android device. If everything goes well, you should see the "Register Success" textView like the following screenshot when you register the app successfully.

registerSuccess

For more details of the registration logics, please check the Creating an Camera Application tutorial.

Implementing the Waypoint Mission

Locating Aircraft on Gaode Map

Before we implementing the waypoint mission feature, we should show the aircraft's location on Gaode Map and try to zoom in automatically to view the surrounding area of the aircraft.

Let's open MainActivity.java file and declare the following variables first:

private double droneLocationLat = 181, droneLocationLng = 181;
private Marker droneMarker = null;
private FlightController mFlightController;

Then, since we need to detect the product connection status, we should register a BroadcastReceiver in the onCreate() method and override the onReceive() method of it as shown below:


@Override
protected void onDestroy(){
super.onDestroy();
unregisterReceiver(mReceiver);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

IntentFilter filter = new IntentFilter();
filter.addAction(DJIDemoApplication.FLAG_CONNECTION_CHANGE);
registerReceiver(mReceiver, filter);

mapView = (MapView) findViewById(R.id.map);
mapView.onCreate(savedInstanceState);

initMapView();
initUI();
}

protected BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
onProductConnectionChange();
}
};

The onReceive() method will be invoked when the DJI Product connection status change, we can use it to update our aircraft's location.

Next, let's implement the initFlightController() method and invoke it inside the onProductConnectionChange() method:

private void onProductConnectionChange()
{

initFlightController();
}

private void initFlightController() {

BaseProduct product = DJIDemoApplication.getProductInstance();
if (product != null && product.isConnected()) {
if (product instanceof Aircraft) {
mFlightController = ((Aircraft) product).getFlightController();
}
}

if (mFlightController != null) {
mFlightController.setStateCallback(
new FlightControllerState.Callback() {
@Override
public void onUpdate(FlightControllerState djiFlightControllerCurrentState) {
droneLocationLat = djiFlightControllerCurrentState.getAircraftLocation().getLatitude();
droneLocationLng = djiFlightControllerCurrentState.getAircraftLocation().getLongitude();
updateDroneLocation();

}
});
}
}

In the code above, we firstly check the product connection status with the help of isConnected() method of BaseProduct. Then initialize mFlightController variable and override the onUpdate() method to invoke updateDroneLocation method. By using the onUpdate() method, you can get the flight controller current state from the parameter.

Furthermore, let's implement the updateDroneLocation() method and invoke it in onClick() method's locate button click action:

public static boolean checkGpsCoordination(double latitude, double longitude) {
return (latitude > -90 && latitude < 90 && longitude > -180 && longitude < 180) && (latitude != 0f && longitude != 0f);
}

private void updateDroneLocation(){

LatLng pos = new LatLng(droneLocationLat, droneLocationLng);
//Create MarkerOptions object
final MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(pos);
markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.aircraft));

runOnUiThread(new Runnable() {
@Override
public void run() {
if (droneMarker != null) {
droneMarker.remove();
}

if (checkGpsCoordinates(droneLocationLat, droneLocationLng)) {
droneMarker = aMap.addMarker(markerOptions);
}
}
});
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.locate:{
updateDroneLocation();
cameraUpdate();
break;
}
case R.id.config:{
showSettingDialog();
break;
}
default:
break;
}
}

In the updateDroneLocation() method, we add the drone location marker on Gaode map.

Finally, let's implement the camearUpdate() method to move camera and zoom in Gaode Map to the drone's location:

private void cameraUpdate(){
LatLng pos = new LatLng(droneLocationLat, droneLocationLng);
float zoomlevel = (float) 18.0;
CameraUpdate cu = CameraUpdateFactory.newLatLngZoom(pos, zoomlevel);
aMap.moveCamera(cu);
}

Before going forward, you can check the Using DJI Assistant 2 Simulator for its basic usage.

Now, let's connect the aircraft to your PC or Mac running DJI Assistant 2 via a Micro USB cable, and then power on the aircraft and the remote controller. Press the Simulator button in the DJI Assistant 2 and feel free to type in your current location's latitude and longitude data into the simulator.

simulatorPreview

Next, build and run the project and install it in your Android device and connect it to the remote controller using USB cable.

Press the Start Simulating button. If you check the application now, a tiny red aircraft will be shown on the map. If you cannot find the aircraft, press the "LOCATE" button to zoom in to the center of the aircraft on the Map. Here is a gif animation for you to check:

locateAircraft

Adding Waypoint Markers

Since you can see the aircraft clearly on the Gaode map now, you can add Marker on the map to show the waypoints of the Waypoint Mission. Let's continue to declare the mMarkers variable first:

private boolean isAdd = false;
private final Map<Integer, Marker> mMarkers = new ConcurrentHashMap<Integer, Marker>();

Then, implement the onMapClick() and markWaypoint() methods as shown below:

private void setResultToToast(final String string){
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, string, Toast.LENGTH_SHORT).show();
}
});
}

@Override
public void onMapClick(LatLng point) {
if (isAdd == true){
markWaypoint(point);
}else{
setResultToToast("Cannot add waypoint");
}
}

private void markWaypoint(LatLng point){
//Create MarkerOptions object
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(point);
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
Marker marker = aMap.addMarker(markerOptions);
mMarkers.put(mMarkers.size(), marker);
}

Here, the onMapClick() method will be invoked when user tap on the Map View. When user tap on different position of the Map View, we will create a MarkerOptions object and assign the "LatLng" object to it, then invoke aMap's addMarker() method by passing the markerOptions parameter to add the waypoint markers on the Gaode map.

Finally, let's implement the onClick() and enableDisableAdd() methods to implement the ADD and CLEAR actions as shown below:

 @Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.add:{
enableDisableAdd();
break;
}
case R.id.clear:{
runOnUiThread(new Runnable() {
@Override
public void run() {
aMap.clear();
}
updateDroneLocation();
});
break;
}
case R.id.config:{
showSettingDialog();
break;
}
default:
break;
}
}

private void enableDisableAdd(){
if (isAdd == false) {
isAdd = true;
add.setText("Exit");
}else{
isAdd = false;
add.setText("Add");
}
}

Now, let's try to build and run your application on an Android device and try to add waypoints on the Gaode map. If everything goes well, you should see the following gif animation:

addWaypointsAni

Implementing Waypoint Missions

Configurating Waypoint Mission

Before we upload a Waypoint Mission, we should provide a way for user to configure it, like setting the flying altitude, speed, heading, etc. So let's declare several variables as shown below firstly:

private float altitude = 100.0f;
private float mSpeed = 10.0f;

private List<Waypoint> waypointList = new ArrayList<>();

public static WaypointMission.Builder waypointMissionBuilder;
private WaypointMissionOperator instance;
private WaypointMissionFinishedAction mFinishedAction = WaypointMissionFinishedAction.NO_ACTION;
private WaypointMissionHeadingMode mHeadingMode = WaypointMissionHeadingMode.AUTO;

Here we declare the altitude, mSpeed, mFinishedAction and mHeadingMode variable and intialize them with default value. Also, we declare the WaypointMission.Builder and WaypointMissionOperator variables for setting up missions.

Next, replace the code of showSettingDialog() method with the followings:

private void showSettingDialog(){
LinearLayout wayPointSettings = (LinearLayout)getLayoutInflater().inflate(R.layout.dialog_waypointsetting, null);

final TextView wpAltitude_TV = (TextView) wayPointSettings.findViewById(R.id.altitude);
RadioGroup speed_RG = (RadioGroup) wayPointSettings.findViewById(R.id.speed);
RadioGroup actionAfterFinished_RG = (RadioGroup) wayPointSettings.findViewById(R.id.actionAfterFinished);
RadioGroup heading_RG = (RadioGroup) wayPointSettings.findViewById(R.id.heading);

speed_RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (checkedId == R.id.lowSpeed){
mSpeed = 3.0f;
} else if (checkedId == R.id.MidSpeed){
mSpeed = 5.0f;
} else if (checkedId == R.id.HighSpeed){
mSpeed = 10.0f;
}
}

});

actionAfterFinished_RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
Log.d(TAG, "Select finish action");
if (checkedId == R.id.finishNone){
mFinishedAction = WaypointMissionFinishedAction.NO_ACTION;
} else if (checkedId == R.id.finishGoHome){
mFinishedAction = WaypointMissionFinishedAction.GO_HOME;
} else if (checkedId == R.id.finishAutoLanding){
mFinishedAction = WaypointMissionFinishedAction.AUTO_LAND;
} else if (checkedId == R.id.finishToFirst){
mFinishedAction = WaypointMissionFinishedAction.GO_FIRST_WAYPOINT;
}
}
});

heading_RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
Log.d(TAG, "Select heading");

if (checkedId == R.id.headingNext) {
mHeadingMode = WaypointMissionHeadingMode.AUTO;
} else if (checkedId == R.id.headingInitDirec) {
mHeadingMode = WaypointMissionHeadingMode.USING_INITIAL_DIRECTION;
} else if (checkedId == R.id.headingRC) {
mHeadingMode = WaypointMissionHeadingMode.CONTROL_BY_REMOTE_CONTROLLER;
} else if (checkedId == R.id.headingWP) {
mHeadingMode = WaypointMissionHeadingMode.USING_WAYPOINT_HEADING;
}
}
});

new AlertDialog.Builder(this)
.setTitle("")
.setView(wayPointSettings)
.setPositiveButton("Finish",new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id) {

String altitudeString = wpAltitude_TV.getText().toString();
altitude = Integer.parseInt(nulltoIntegerDefalt(altitudeString));
Log.e(TAG,"altitude "+altitude);
Log.e(TAG,"speed "+mSpeed);
Log.e(TAG, "mFinishedAction "+mFinishedAction);
Log.e(TAG, "mHeadingMode "+mHeadingMode);
configWayPointMission();
}

})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}

})
.create()
.show();
}

String nulltoIntegerDefault(String value){
if(!isIntValue(value)) value="0";
return value;
}

boolean isIntValue(String val)
{

try {
val=val.replace(" ","");
Integer.parseInt(val);
} catch (Exception e) {return false;}
return true;
}

Here, we implement the setOnCheckedChangeListener() method of "RadioGroup" class and pass different values to the mSpeed, mFinishedAction and mHeadingMode variables based on the item user select.

For the finished action of DJIWaypointMission, we provide several enum values here:

  • AUTO_LAND

    The aircraft will land automatically at the last waypoint.

  • CONTINUE_UNTIL_END

    If the user attempts to pull the aircraft back along the flight path as the mission is being executed, the aircarft will move towards the previous waypoint and will continue to do so until there are no more waypoint to move back to or the user has stopped attempting to move the aircraft back.

  • GO_FIRST_WAYPOINT

    The aircraft will go back to its first waypoint and hover in position.

  • GO_HOME

    The aicraft will go home when the mission is complete.

  • NO_ACTION

    No further action will be taken on completion of mission.

For the heading mode of DJIWaypointMission, we provide these enum values here:

  • AUTO

    Aircraft's heading will always be in the direction of flight.

  • CONTROL_BY_REMOTE_CONTROLLER

    Aircraft's heading will be controlled by the remote controller.

  • TOWARD_POINT_OF_INTEREST

    Aircraft's heading will always toward point of interest.

  • USING_INITIAL_DIRECTION

    Aircraft's heading will be set to the initial take-off heading.

  • USING_WAYPOINT_HEADING

Aircraft's heading will be set to the previous waypoint's heading while travelling between waypoints.

Now, let's continue to implement the getWaypointMissionOperator() and configWayPointMission() methods as shown below:

public WaypointMissionOperator getWaypointMissionOperator() {
if (instance == null) {
instance = DJISDKManager.getInstance().getMissionControl().getWaypointMissionOperator();
}
return instance;
}

private void configWayPointMission(){

if (waypointMissionBuilder == null){

waypointMissionBuilder = new WaypointMission.Builder().finishedAction(mFinishedAction)
.headingMode(mHeadingMode)
.autoFlightSpeed(mSpeed)
.maxFlightSpeed(mSpeed)
.flightPathMode(WaypointMissionFlightPathMode.NORMAL);

}else
{
waypointMissionBuilder.finishedAction(mFinishedAction)
.headingMode(mHeadingMode)
.autoFlightSpeed(mSpeed)
.maxFlightSpeed(mSpeed)
.flightPathMode(WaypointMissionFlightPathMode.NORMAL);

}

if (waypointMissionBuilder.getWaypointList().size() > 0){

for (int i=0; i< waypointMissionBuilder.getWaypointList().size(); i++){
waypointMissionBuilder.getWaypointList().get(i).altitude = altitude;
}

setResultToToast("Set Waypoint attitude successfully");
}

DJIError error = getWaypointMissionOperator().loadMission(waypointMissionBuilder.build());
if (error == null) {
setResultToToast("loadWaypoint succeeded");
} else {
setResultToToast("loadWaypoint failed " + error.getDescription());
}

}

In the code above, we firstly get the WaypointMissionOperator instance in the getWaypointMissionOperator() method, then in the configWayPointMission() method, we check if waypointMissionBuilder is null and set its finishedAction, headingMode, autoFlightSpeed, maxFlightSpeed and flightPathMode variables of WaypointMission.Builder. Then we use a for loop to set each DJIWaypoint's altitude in the waypointMissionBuilder's waypointsList. Next, we invoke the loadMission() method of WaypointMissionOperator and pass the waypointMissionBuilder.build() as its parameter to load the waypoint mission to the operator.

Upload Waypoint Mission

Now, let's create the following methods to setup WaypointMissionOperatorListener:

@Override
protected void onCreate(Bundle savedInstanceState) {
...
addListener();

}

@Override
protected void onDestroy(){
...
removeListener();
}

//Add Listener for WaypointMissionOperator
private void addListener() {
if (getWaypointMissionOperator() != null) {
getWaypointMissionOperator().addListener(eventNotificationListener);
}
}

private void removeListener() {
if (getWaypointMissionOperator() != null) {
getWaypointMissionOperator().removeListener(eventNotificationListener);
}
}

private WaypointMissionOperatorListener eventNotificationListener = new WaypointMissionOperatorListener() {
@Override
public void onDownloadUpdate(WaypointMissionDownloadEvent downloadEvent) {

}

@Override
public void onUploadUpdate(WaypointMissionUploadEvent uploadEvent) {

}

@Override
public void onExecutionUpdate(WaypointMissionExecutionEvent executionEvent) {

}

@Override
public void onExecutionStart() {

}

@Override
public void onExecutionFinish(@Nullable final DJIError error) {
setResultToToast("Execution finished: " + (error == null ? "Success!" : error.getDescription()));
}
};

In the code above, we invoke the addListener() and removeListener() methods of WaypointMissionOperator to add and remove the WaypointMissionOperatorListener and then invoke the addListener() method at the bottom of onCreate() method and invoke the removeListener() method in the onDestroy() method.

Next, initialize the WaypointMissionOperatorListener instance and implement its onExecutionFinish() method to show a message to inform user when the mission execution finished.

Furthermore, let's set waypointList of WaypointMission.Builder when user tap on the map to add a waypoint in the onMapClick() method and implement the uploadWayPointMission() method to upload mission to the operator as shown below:

@Override
public void onMapClick(LatLng point) {
if (isAdd == true){
markWaypoint(point);
Waypoint mWaypoint = new Waypoint(point.latitude, point.longitude, altitude);
//Add Waypoints to Waypoint arraylist;
if (waypointMissionBuilder != null) {
waypointList.add(mWaypoint);
waypointMissionBuilder.waypointList(waypointList).waypointCount(waypointList.size());
}else
{
waypointMissionBuilder = new WaypointMission.Builder();
waypointList.add(mWaypoint);
waypointMissionBuilder.waypointList(waypointList).waypointCount(waypointList.size());
}
}else{
setResultToToast("Cannot Add Waypoint");
}
}

private void uploadWayPointMission(){

getWaypointMissionOperator().uploadMission(new CommonCallbacks.CompletionCallback() {
@Override
public void onResult(DJIError error) {
if (error == null) {
setResultToToast("Mission upload successfully!");
} else {
setResultToToast("Mission upload failed, error: " + error.getDescription() + " retrying...");
getWaypointMissionOperator().retryUploadMission(null);
}
}
});

}

Lastly, let's add the R.id.upload case checking in the onClick() method:

case R.id.upload:{
uploadWayPointMission();
break;
}

Start and Stop Mission

Once the mission finish uploading, we can invoke the startMission() and stopMission() methods of WaypointMissionOperator to implement the start and stop mission features as shown below:

private void startWaypointMission(){

getWaypointMissionOperator().startMission(new CommonCallbacks.CompletionCallback() {
@Override
public void onResult(DJIError error) {
setResultToToast("Mission Start: " + (error == null ? "Successfully" : error.getDescription()));
}
});

}

private void stopWaypointMission(){

getWaypointMissionOperator().stopMission(new CommonCallbacks.CompletionCallback() {
@Override
public void onResult(DJIError error) {
setResultToToast("Mission Stop: " + (error == null ? "Successfully" : error.getDescription()));
}
});

}

Lastly, let's improve the onClick() method to improve the clear button action and implement the start and stop button actions:

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.locate:{
updateDroneLocation();
cameraUpdate(); // Locate the drone's place
break;
}
case R.id.add:{
enableDisableAdd();
break;
}
case R.id.clear: {
runOnUiThread(new Runnable() {
@Override
public void run() {
aMap.clear();
}

});
waypointList.clear();
waypointMissionBuilder.waypointList(waypointList);
updateDroneLocation();
break;
}
case R.id.config:{
showSettingDialog();
break;
}
case R.id.upload:{
uploadWayPointMission();
break;
}
case R.id.start:{
startWaypointMission();
break;
}
case R.id.stop:{
stopWaypointMission();
break;
}
default:
break;
}
}

Test Waypoint Mission with DJI Assistant 2 Simulator

You've come a long way in this tutorial, and it's time to test the whole application.

Important: Make sure the battery level of your aircraft is more than 10%, otherwise the waypoint mission may fail!

Build and run the project to install the application into your android device. After that, please connect the aircraft to your PC or Mac running DJI Assistant 2 Simulator via a Micro USB cable. Then, power on the remote controller and the aircraft, in that order.

Next, press the Simulator button in the DJI Assistant 2 and feel free to type in your current location's latitude and longitude data into the simulator.

simulatorPreview

Then connect your android device to the remote controller using USB cable and run the application. Go back to the DJI Assistant 2 Simulator on your PC or Mac and press the Start Simulating button. A tiny red aircraft will appear on the map in your application, if you press the LOCATE button, the map view will zoom in to the region you are in and will center the aircraft:

locateAircraft

Next, press the Add button and tap on the Map where you want to add waypoints, as shown below:

addWaypointsAni

Once you press the CONFIG button, the Waypoint Configuration dialog will appear. Modify the settings as you want and press Finish button. Then press the UPLOAD button to upload the mission.

If upload mission success, press the START button to start the waypoint mission execution.

prepareMission

Now you should see the aircraft move towards the waypoints you set previously on the map view, as shown below:

startMission

At the same time, you are able to see the Mavic Pro take off and start to fly in the DJI Assistant 2 Simulator.

flyingInSimulator

When the waypoint mission finishes, an "Execution finished: Success!" message will appear and the Mavic Pro will start to go home!

Also, the remote controller will start beeping. Let's take a look at the DJI Assistant 2 Simulator now:

landing

The Mavic Pro will eventually go home, land, and the beeping from the remote controller will stop. The application will go back to its normal status. If you press the CLEAR button, all the waypoints you previously set will be cleared. During the mission, if you'd ever like to stop the DJIWaypoint mission, you can do so by pressing the STOP button.

Summary

In this tutorial, you’ve learned how to setup and use the DJI Assistant 2 Simulator to test your waypoint mission application, upgrade your aircraft's firmware to the developer version, use the DJI Mobile SDK to create a simple map view, modify annotations of the map view, show the aircraft on the map view by using GPS data from the DJI Assistant 2 Simulator. Next, you learned how to use the WaypointMission.Builder to configure waypoint mission settings, how to create and set the waypointList in the WaypointMission.Builder. Moreover, you learned how to use WaypointMissionOperator to upload, start and stop missions.

Congratulations! Now that you've finished the demo project, you can build on what you've learned and start to build your own waypoint mission application. You can improve the method which waypoints are added(such as drawing a line on the map and generating waypoints automatically), play around with the properties of a waypoint (such as heading, etc.), and adding more functionality. In order to make a cool waypoint mission application, you still have a long way to go. Good luck and hope you enjoy this tutorial!