Location Tracking Modes

This example shows how to Switch Location Tracking Modes

Location Permissions Handling
Switch Location component RenderMode
Switch Location Tracking Camera Mode
Enable/Disable Location Component
Tracking Current Location Automatically when MapReady
- locationComponent.setLocationComponentEnabled(true);
- locationComponent.setRenderMode(RenderMode.COMPASS);
- locationComponent.setCameraMode(CameraMode.TRACKING);

For all code examples, refer to Android Maps SDK Code Examples

activity_location_modes.xml view source

1
<?xml version="1.0" encoding="utf-8"?>
2
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
3
    xmlns:app="http://schemas.android.com/apk/res-auto"
4
    xmlns:tools="http://schemas.android.com/tools"
5
    android:layout_width="match_parent"
6
    android:layout_height="match_parent">
7

8
    <ai.nextbillion.maps.core.MapView
9
        android:id="@+id/mapView"
10
        android:layout_width="match_parent"
11
        android:layout_height="match_parent"
12
        android:layout_marginBottom="0dp"
13
        app:layout_constraintBottom_toTopOf="parent"
14
        app:layout_constraintLeft_toLeftOf="parent"
15
        app:layout_constraintRight_toRightOf="parent"
16
        app:layout_constraintTop_toTopOf="parent"
17
        app:nbmap_uiAttribution="false" />
18

19
    <View
20
        android:id="@+id/view_protected_gesture_area"
21
        android:layout_width="0dp"
22
        android:layout_height="0dp"
23
        android:alpha="0.5"
24
        android:background="@android:color/holo_red_light"
25
        app:layout_constraintStart_toStartOf="@id/mapView"
26
        app:layout_constraintTop_toTopOf="@id/mapView" />
27

28
    <LinearLayout
29
        android:id="@+id/linearLayout"
30
        style="?android:attr/buttonBarStyle"
31
        android:layout_width="0dp"
32
        android:layout_height="wrap_content"
33
        android:background="@color/palette_mint_100"
34
        android:orientation="horizontal"
35
        android:weightSum="4"
36
        app:layout_constraintBottom_toBottomOf="parent"
37
        app:layout_constraintLeft_toLeftOf="parent"
38
        app:layout_constraintRight_toRightOf="parent"
39
        tools:layout_constraintBottom_creator="1"
40
        tools:layout_constraintLeft_creator="1"
41
        tools:layout_constraintRight_creator="1">
42

43
        <TextView
44
            android:id="@+id/tv_mode"
45
            android:layout_width="0dp"
46
            android:layout_height="match_parent"
47
            android:layout_weight=".75"
48
            android:gravity="center"
49
            android:text="Mode:"
50
            android:textColor="@color/white"
51
            android:textSize="18sp"
52
            android:textStyle="bold" />
53

54
        <Button
55
            android:id="@+id/button_location_mode"
56
            style="?android:attr/buttonBarButtonStyle"
57
            android:layout_width="0dp"
58
            android:layout_height="wrap_content"
59
            android:layout_weight="1.25"
60
            android:gravity="center"
61
            android:text="Normal"
62
            android:textColor="@android:color/white" />
63

64
        <TextView
65
            android:id="@+id/tv_tracking"
66
            android:layout_width="0dp"
67
            android:layout_height="match_parent"
68
            android:layout_weight=".85"
69
            android:gravity="center"
70
            android:text="Tracking:"
71
            android:textColor="@color/white"
72
            android:textSize="18sp"
73
            android:textStyle="bold" />
74

75
        <Button
76
            android:id="@+id/button_location_tracking"
77
            style="?android:attr/buttonBarButtonStyle"
78
            android:layout_width="0dp"
79
            android:layout_height="wrap_content"
80
            android:layout_weight="1.15"
81
            android:gravity="center"
82
            android:text="None"
83
            android:textColor="@android:color/white" />
84

85
    </LinearLayout>
86

87
</androidx.constraintlayout.widget.ConstraintLayout>

LocationModesActivity view source

1
package ai.nextbillion;
2

3
import android.annotation.SuppressLint;
4
import android.graphics.RectF;
5
import android.location.Location;
6
import android.os.Bundle;
7
import android.view.Menu;
8
import android.view.MenuItem;
9
import android.view.View;
10
import android.widget.ArrayAdapter;
11
import android.widget.Button;
12
import android.widget.Toast;
13

14
import java.util.ArrayList;
15
import java.util.List;
16

17
import ai.nextbillion.maps.camera.CameraUpdateFactory;
18
import ai.nextbillion.maps.core.MapView;
19
import ai.nextbillion.maps.core.NextbillionMap;
20
import ai.nextbillion.maps.core.OnMapReadyCallback;
21
import ai.nextbillion.maps.location.LocationComponent;
22
import ai.nextbillion.maps.location.LocationComponentActivationOptions;
23
import ai.nextbillion.maps.location.LocationComponentOptions;
24
import ai.nextbillion.maps.location.OnCameraTrackingChangedListener;
25
import ai.nextbillion.maps.location.OnLocationCameraTransitionListener;
26
import ai.nextbillion.maps.location.OnLocationClickListener;
27
import ai.nextbillion.maps.location.engine.LocationEngineRequest;
28
import ai.nextbillion.maps.location.modes.CameraMode;
29
import ai.nextbillion.maps.location.modes.RenderMode;
30
import ai.nextbillion.maps.location.permissions.PermissionsListener;
31
import ai.nextbillion.maps.location.permissions.PermissionsManager;
32
import androidx.annotation.NonNull;
33
import androidx.appcompat.app.AppCompatActivity;
34
import androidx.appcompat.widget.ListPopupWindow;
35

36
public class LocationModesActivity extends AppCompatActivity implements OnMapReadyCallback,
37
        OnLocationClickListener, OnCameraTrackingChangedListener {
38

39
    private MapView mapView;
40
    private Button locationModeBtn;
41
    private Button locationTrackingBtn;
42
    private View protectedGestureArea;
43

44
    private PermissionsManager permissionsManager;
45

46
    private LocationComponent locationComponent;
47
    private NextbillionMap nextbillionMap;
48
    private boolean defaultStyle = false;
49

50
    private static final String SAVED_STATE_CAMERA = "saved_state_camera";
51
    private static final String SAVED_STATE_RENDER = "saved_state_render";
52
    private static final String SAVED_STATE_LOCATION = "saved_state_location";
53

54
    @CameraMode.Mode
55
    private int cameraMode = CameraMode.TRACKING;
56

57
    @RenderMode.Mode
58
    private int renderMode = RenderMode.NORMAL;
59

60
    private Location lastLocation;
61

62
    @Override
63
    protected void onCreate(Bundle savedInstanceState) {
64
        super.onCreate(savedInstanceState);
65
        setContentView(R.layout.activity_location_modes);
66

67
        mapView = findViewById(R.id.mapView);
68
        protectedGestureArea = findViewById(R.id.view_protected_gesture_area);
69

70
        locationModeBtn = findViewById(R.id.button_location_mode);
71
        locationModeBtn.setOnClickListener(v -> {
72
            if (locationComponent == null) {
73
                return;
74
            }
75
            showModeListDialog();
76
        });
77

78
        locationTrackingBtn = findViewById(R.id.button_location_tracking);
79
        locationTrackingBtn.setOnClickListener(v -> {
80
            if (locationComponent == null) {
81
                return;
82
            }
83
            showTrackingListDialog();
84
        });
85

86

87
        if (savedInstanceState != null) {
88
            cameraMode = savedInstanceState.getInt(SAVED_STATE_CAMERA);
89
            renderMode = savedInstanceState.getInt(SAVED_STATE_RENDER);
90
            lastLocation = savedInstanceState.getParcelable(SAVED_STATE_LOCATION);
91
        }
92

93
        mapView.onCreate(savedInstanceState);
94

95
        if (PermissionsManager.areLocationPermissionsGranted(this)) {
96
            mapView.getMapAsync(this);
97
        } else {
98
            permissionsManager = new PermissionsManager(new PermissionsListener() {
99
                @Override
100
                public void onExplanationNeeded(List<String> permissionsToExplain) {
101
                    Toast.makeText(LocationModesActivity.this, "You need to accept location permissions.",
102
                            Toast.LENGTH_SHORT).show();
103
                }
104

105
                @Override
106
                public void onPermissionResult(boolean granted) {
107
                    if (granted) {
108
                        mapView.getMapAsync(LocationModesActivity.this);
109
                    } else {
110
                        finish();
111
                    }
112
                }
113
            });
114
            permissionsManager.requestLocationPermissions(this);
115
        }
116
    }
117

118
    @Override
119
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
120
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
121
        permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
122
    }
123

124
    @SuppressLint("MissingPermission")
125
    @Override
126
    public void onMapReady(@NonNull NextbillionMap nextbillionMap) {
127
        this.nextbillionMap = nextbillionMap;
128
        nextbillionMap.animateCamera(CameraUpdateFactory.zoomBy(13));
129
        nextbillionMap.setStyle(StyleConstants.NBMAP_STREETS, style -> {
130
            locationComponent = nextbillionMap.getLocationComponent();
131
            locationComponent.activateLocationComponent(
132
                    LocationComponentActivationOptions
133
                            .builder(this, style)
134
                            .useSpecializedLocationLayer(true)
135
                            .useDefaultLocationEngine(true)
136
                            .locationEngineRequest(new LocationEngineRequest.Builder(750)
137
                                    .setFastestInterval(750)
138
                                    .setPriority(LocationEngineRequest.PRIORITY_HIGH_ACCURACY)
139
                                    .build())
140
                            .build());
141

142
            locationComponent.setLocationComponentEnabled(true);
143
            locationComponent.addOnLocationClickListener(this);
144
            locationComponent.addOnCameraTrackingChangedListener(this);
145
            locationComponent.setCameraMode(cameraMode);
146
            setRendererMode(renderMode);
147
            locationComponent.forceLocationUpdate(lastLocation);
148
        });
149
    }
150

151
    @Override
152
    public boolean onCreateOptionsMenu(Menu menu) {
153
        getMenuInflater().inflate(R.menu.menu_location_mode, menu);
154
        return true;
155
    }
156

157
    @SuppressLint("MissingPermission")
158
    @Override
159
    public boolean onOptionsItemSelected(MenuItem item) {
160
        if (locationComponent == null) {
161
            return super.onOptionsItemSelected(item);
162
        }
163

164
        int id = item.getItemId();
165
        if (id == R.id.action_component_disable) {
166
            locationComponent.setLocationComponentEnabled(false);
167
            return true;
168
        } else if (id == R.id.action_component_enabled) {
169
            locationComponent.setLocationComponentEnabled(true);
170
            return true;
171
        } else if (id == R.id.action_gestures_management_disabled) {
172
            disableGesturesManagement();
173
            return true;
174
        } else if (id == R.id.action_gestures_management_enabled) {
175
            enableGesturesManagement();
176
            return true;
177
        } else if (id == R.id.action_component_throttling_enabled) {
178
            locationComponent.setMaxAnimationFps(5);
179
        } else if (id == R.id.action_component_throttling_disabled) {
180
            locationComponent.setMaxAnimationFps(Integer.MAX_VALUE);
181
        } else if (id == R.id.action_component_animate_while_tracking) {
182
            locationComponent.zoomWhileTracking(17, 750, new NextbillionMap.CancelableCallback() {
183
                @Override
184
                public void onCancel() {
185
                    // No impl
186
                }
187

188
                @Override
189
                public void onFinish() {
190
                    locationComponent.tiltWhileTracking(60);
191
                }
192
            });
193
            if (locationComponent.getCameraMode() == CameraMode.NONE) {
194

195
                Toast.makeText(this, "Not possible to animate - not tracking", Toast.LENGTH_SHORT).show();
196
            }
197
        }
198

199
        return super.onOptionsItemSelected(item);
200
    }
201

202
    private void disableGesturesManagement() {
203
        if (locationComponent == null) {
204
            return;
205
        }
206

207
        protectedGestureArea.getLayoutParams().height = 0;
208
        protectedGestureArea.getLayoutParams().width = 0;
209

210
        LocationComponentOptions options = locationComponent
211
                .getLocationComponentOptions()
212
                .toBuilder()
213
                .trackingGesturesManagement(false)
214
                .build();
215
        locationComponent.applyStyle(options);
216
    }
217

218
    private void enableGesturesManagement() {
219
        if (locationComponent == null) {
220
            return;
221
        }
222

223
        RectF rectF = new RectF(0f, 0f, mapView.getWidth() / 2f, mapView.getHeight() / 2f);
224
        protectedGestureArea.getLayoutParams().height = (int) rectF.bottom;
225
        protectedGestureArea.getLayoutParams().width = (int) rectF.right;
226

227
        LocationComponentOptions options = locationComponent
228
                .getLocationComponentOptions()
229
                .toBuilder()
230
                .trackingGesturesManagement(true)
231
                .trackingMultiFingerProtectedMoveArea(rectF)
232
                .trackingMultiFingerMoveThreshold(500)
233
                .build();
234
        locationComponent.applyStyle(options);
235
    }
236

237
    @Override
238
    protected void onStart() {
239
        super.onStart();
240
        mapView.onStart();
241
    }
242

243
    @Override
244
    protected void onResume() {
245
        super.onResume();
246
        mapView.onResume();
247
    }
248

249
    @Override
250
    protected void onPause() {
251
        super.onPause();
252
        mapView.onPause();
253
    }
254

255
    @Override
256
    protected void onStop() {
257
        super.onStop();
258
        mapView.onStop();
259
    }
260

261
    @SuppressLint("MissingPermission")
262
    @Override
263
    protected void onSaveInstanceState(Bundle outState) {
264
        super.onSaveInstanceState(outState);
265
        mapView.onSaveInstanceState(outState);
266
        outState.putInt(SAVED_STATE_CAMERA, cameraMode);
267
        outState.putInt(SAVED_STATE_RENDER, renderMode);
268
        if (locationComponent != null) {
269
            outState.putParcelable(SAVED_STATE_LOCATION, locationComponent.getLastKnownLocation());
270
        }
271
    }
272

273
    @Override
274
    protected void onDestroy() {
275
        super.onDestroy();
276
        mapView.onDestroy();
277
    }
278

279
    @Override
280
    public void onLowMemory() {
281
        super.onLowMemory();
282
        mapView.onLowMemory();
283
    }
284

285
    @Override
286
    public void onLocationComponentClick() {
287
        Toast.makeText(this, "OnLocationComponentClick", Toast.LENGTH_LONG).show();
288
    }
289

290
    private void showModeListDialog() {
291
        List<String> modes = new ArrayList<>();
292
        modes.add("Normal");
293
        modes.add("Compass");
294
        modes.add("GPS");
295
        ArrayAdapter<String> profileAdapter = new ArrayAdapter<>(this,
296
                android.R.layout.simple_list_item_1, modes);
297
        ListPopupWindow listPopup = new ListPopupWindow(this);
298
        listPopup.setAdapter(profileAdapter);
299
        listPopup.setAnchorView(locationModeBtn);
300
        listPopup.setOnItemClickListener((parent, itemView, position, id) -> {
301
            String selectedMode = modes.get(position);
302
            locationModeBtn.setText(selectedMode);
303
            if (selectedMode.contentEquals("Normal")) {
304
                setRendererMode(RenderMode.NORMAL);
305
            } else if (selectedMode.contentEquals("Compass")) {
306
                setRendererMode(RenderMode.COMPASS);
307
            } else if (selectedMode.contentEquals("GPS")) {
308
                setRendererMode(RenderMode.GPS);
309
            }
310
            listPopup.dismiss();
311
        });
312
        listPopup.show();
313
    }
314

315
    private void setRendererMode(@RenderMode.Mode int mode) {
316
        renderMode = mode;
317
        locationComponent.setRenderMode(mode);
318
        if (mode == RenderMode.NORMAL) {
319
            locationModeBtn.setText("Normal");
320
        } else if (mode == RenderMode.COMPASS) {
321
            locationModeBtn.setText("Compass");
322
        } else if (mode == RenderMode.GPS) {
323
            locationModeBtn.setText("Gps");
324
        }
325
    }
326

327
    private void showTrackingListDialog() {
328
        List<String> trackingTypes = new ArrayList<>();
329
        trackingTypes.add("None");
330
        trackingTypes.add("None Compass");
331
        trackingTypes.add("None GPS");
332
        trackingTypes.add("Tracking");
333
        trackingTypes.add("Tracking Compass");
334
        trackingTypes.add("Tracking GPS");
335
        trackingTypes.add("Tracking GPS North");
336
        ArrayAdapter<String> profileAdapter = new ArrayAdapter<>(this,
337
                android.R.layout.simple_list_item_1, trackingTypes);
338
        ListPopupWindow listPopup = new ListPopupWindow(this);
339
        listPopup.setAdapter(profileAdapter);
340
        listPopup.setAnchorView(locationTrackingBtn);
341
        listPopup.setOnItemClickListener((parent, itemView, position, id) -> {
342
            String selectedTrackingType = trackingTypes.get(position);
343
            locationTrackingBtn.setText(selectedTrackingType);
344
            if (selectedTrackingType.contentEquals("None")) {
345
                setCameraTrackingMode(CameraMode.NONE);
346
            } else if (selectedTrackingType.contentEquals("None Compass")) {
347
                setCameraTrackingMode(CameraMode.NONE_COMPASS);
348
            } else if (selectedTrackingType.contentEquals("None GPS")) {
349
                setCameraTrackingMode(CameraMode.NONE_GPS);
350
            } else if (selectedTrackingType.contentEquals("Tracking")) {
351
                setCameraTrackingMode(CameraMode.TRACKING);
352
            } else if (selectedTrackingType.contentEquals("Tracking Compass")) {
353
                setCameraTrackingMode(CameraMode.TRACKING_COMPASS);
354
            } else if (selectedTrackingType.contentEquals("Tracking GPS")) {
355
                setCameraTrackingMode(CameraMode.TRACKING_GPS);
356
            } else if (selectedTrackingType.contentEquals("Tracking GPS North")) {
357
                setCameraTrackingMode(CameraMode.TRACKING_GPS_NORTH);
358
            }
359
            listPopup.dismiss();
360
        });
361
        listPopup.show();
362
    }
363

364
    private void setCameraTrackingMode(@CameraMode.Mode int mode) {
365
        locationComponent.setCameraMode(mode, 1200, 16.0, null, 45.0,
366
                new OnLocationCameraTransitionListener() {
367
                    @Override
368
                    public void onLocationCameraTransitionFinished(@CameraMode.Mode int cameraMode) {
369
                        Toast.makeText(LocationModesActivity.this, "Transition finished", Toast.LENGTH_SHORT).show();
370
                    }
371

372
                    @Override
373
                    public void onLocationCameraTransitionCanceled(@CameraMode.Mode int cameraMode) {
374
                        Toast.makeText(LocationModesActivity.this, "Transition canceled", Toast.LENGTH_SHORT).show();
375
                    }
376
                });
377
    }
378

379
    @Override
380
    public void onCameraTrackingDismissed() {
381
        locationTrackingBtn.setText("None");
382
    }
383

384
    @Override
385
    public void onCameraTrackingChanged(int currentMode) {
386
        this.cameraMode = currentMode;
387
        if (currentMode == CameraMode.NONE) {
388
            locationTrackingBtn.setText("None");
389
        } else if (currentMode == CameraMode.NONE_COMPASS) {
390
            locationTrackingBtn.setText("None Compass");
391
        } else if (currentMode == CameraMode.NONE_GPS) {
392
            locationTrackingBtn.setText("None GPS");
393
        } else if (currentMode == CameraMode.TRACKING) {
394
            locationTrackingBtn.setText("Tracking");
395
        } else if (currentMode == CameraMode.TRACKING_COMPASS) {
396
            locationTrackingBtn.setText("Tracking Compass");
397
        } else if (currentMode == CameraMode.TRACKING_GPS) {
398
            locationTrackingBtn.setText("Tracking GPS");
399
        } else if (currentMode == CameraMode.TRACKING_GPS_NORTH) {
400
            locationTrackingBtn.setText("Tracking GPS North");
401
        }
402
    }
403
}

Summary: The given code is an Android activity that demonstrates various location modes and features using the NextbillionMap library. It initializes a map view, handles location permissions, tracks the current location, switches between location component render modes and tracking camera modes and enables or disables the location component.

initMapView:

The map view is initialized in the onCreate method by finding the view with the ID R.id.mapView. This method sets up the map view and initializes other UI elements and variables.

Location Permissions Handling:

The code checks if location permissions are granted using PermissionsManager.areLocationPermissionsGranted(this). If permissions are granted, the map is asynchronously loaded using mapView.getMapAsync(this). If permissions are not granted, a PermissionsManager is created and used to request location permissions. The result of the permission request is handled in the onPermissionResult method.

Tracking Current Location Automatically when MapReady:

When the map is ready (onMapReady), the NextbillionMap instance is obtained. The map's style is set, and the location component is activated with various options, including a specialized location layer, default location engine, and location update interval. The location component is enabled and configured with listeners for location clicks and camera tracking changes. The last known location is also updated.

Switch Location component RenderMode:

The render mode can be switched using the showModeListDialog method, which displays a dialog with options for Normal, Compass, and GPS render modes. The selected mode is applied to the location component using setRendererMode().

Switch Location Tracking CameraMode:

The camera tracking mode can be switched using the showTrackingListDialog method, which displays a dialog with options for different camera tracking modes. The selected mode is applied to the location component using setCameraTrackingMode().

Enable/Disable Location Component:

The location component can be enabled or disabled by clicking on the corresponding menu items in the options menu. The status of the location component is updated accordingly using setLocationComponentEnabled.

The code also includes various lifecycle methods for managing the map view, saving and restoring the state of the activity, and handling user interactions with the location component, such as clicking and dismissing camera tracking.

Overall, the code demonstrates how to use the NextbillionMap library to implement location-based features in an Android application, including handling permissions, tracking the user's location, and customizing the render and camera tracking modes of the location component.

Location Tracking Modes

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