MainActivity.java

package pl.itberries.msh.discoverity;

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.PointF;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.mapbox.mapboxsdk.camera.CameraPosition;
import com.mapbox.mapboxsdk.constants.MyLocationTracking;
import com.mapbox.mapboxsdk.constants.Style;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.geometry.LatLngBounds;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Projection;
import com.mapbox.mapboxsdk.maps.UiSettings;
import com.mapbox.mapboxsdk.offline.OfflineManager;
import com.mapbox.mapboxsdk.offline.OfflineRegion;
import com.mapbox.mapboxsdk.offline.OfflineRegionError;
import com.mapbox.mapboxsdk.offline.OfflineRegionStatus;
import com.mapbox.mapboxsdk.offline.OfflineTilePyramidRegionDefinition;

import javax.inject.Inject;

import butterknife.Bind;
import butterknife.ButterKnife;

import static pl.itberries.msh.discoverity.App.app;

public class MainActivity extends AppCompatActivity {
    public static final double INITIAL_ZOOM = 16.0;
    @Bind(R.id.baseMapView)
    MapView mapView;
    private OfflineManager manager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        app(this).getComponent().inject(this);

        manager = OfflineManager.getInstance(MainActivity.this);
        manager.setAccessToken(getString(R.string.mapboxToken));

        mapView.onCreate(savedInstanceState);
        mapView.getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(final MapboxMap mapboxMap) {
                requestPermissions(Manifest.permission.ACCESS_FINE_LOCATION,
                        Manifest.permission.ACCESS_COARSE_LOCATION);
                requestPermissions(Manifest.permission.CAMERA);

                trackUser(mapboxMap);

                mapboxMap.setStyle(Style.MAPBOX_STREETS);
                UiSettings uiSettings = mapboxMap.getUiSettings();
                uiSettings.setAttributionMargins(7, 7, 7, 7);
                uiSettings.setAttributionGravity(Gravity.START | Gravity.TOP);
                uiSettings.setTiltGesturesEnabled(false);
                uiSettings.setRotateGesturesEnabled(false);
                uiSettings.setScrollGesturesEnabled(false);
                uiSettings.setLogoGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);

                manager.listOfflineRegions(new OfflineManager.ListOfflineRegionsCallback() {
                    @Override
                    public void onList(OfflineRegion[] offlineRegions) {
                        Toast.makeText(MainActivity.this, "Offline regions: " + offlineRegions.length, Toast.LENGTH_LONG).show();
                    }

                    @Override
                    public void onError(String error) {

                    }
                });
            }
        });
    }

    void resumeUserTracking() {
        mapView.getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(MapboxMap mapboxMap) {
                trackUser(mapboxMap);
            }
        });
    }

    private void trackUser(MapboxMap mapboxMap) {
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        Location last = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        mapboxMap.setCameraPosition(new CameraPosition.Builder()
                .zoom(INITIAL_ZOOM)
                .target(last != null ? new LatLng(last.getLatitude(), last.getLongitude()) : null)
                .build()
        );
        mapboxMap.getTrackingSettings().setMyLocationTrackingMode(MyLocationTracking.TRACKING_FOLLOW);
        mapboxMap.setMyLocationEnabled(true);
    }

    @Override
    public void onResume() {
        super.onResume();
        mapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mapView.onPause();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mapView.onLowMemory();
    }

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

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mapView.onSaveInstanceState(outState);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_remember_map_area:
                downloadWithinBounds();
                return true;
            case R.id.action_forget_map_areas:
                deleteAllRegions();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void downloadWithinBounds() {
        mapView.getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(MapboxMap mapboxMap) {
                Projection projection = mapboxMap.getProjection();
                LatLng topLeft = projection.fromScreenLocation(new PointF(0, 0));
                LatLng bottomRight = projection.fromScreenLocation(
                        new PointF(mapView.getWidth(), mapView.getHeight()));
                manager.createOfflineRegion(new OfflineTilePyramidRegionDefinition(
                        Style.MAPBOX_STREETS,
                        new LatLngBounds.Builder()
                                .include(topLeft)
                                .include(bottomRight)
                                .build(),
                        mapboxMap.getCameraPosition().zoom,
                        mapboxMap.getMaxZoom(),
                        1.0f
                ), new byte[0], new OfflineManager.CreateOfflineRegionCallback() {
                    @Override
                    public void onCreate(OfflineRegion offlineRegion) {
                        offlineRegion.setDownloadState(OfflineRegion.STATE_ACTIVE);
                        offlineRegion.setObserver(new OfflineRegion.OfflineRegionObserver() {
                            @Override
                            public void onStatusChanged(OfflineRegionStatus status) {
                                if (status.isComplete()) {
                                    Toast.makeText(MainActivity.this, "Done saving map.", Toast.LENGTH_SHORT).show();
                                }
                            }

                            @Override
                            public void onError(OfflineRegionError error) {

                            }

                            @Override
                            public void mapboxTileCountLimitExceeded(long limit) {

                            }
                        });
                    }

                    @Override
                    public void onError(String error) {
                    }
                });
            }
        });
    }

    private void deleteAllRegions() {
        manager.listOfflineRegions(new OfflineManager.ListOfflineRegionsCallback() {
            @Override
            public void onList(OfflineRegion[] offlineRegions) {
                for (OfflineRegion region : offlineRegions) {
                    region.delete(new OfflineRegion.OfflineRegionDeleteCallback() {
                        @Override
                        public void onDelete() {
                        }

                        @Override
                        public void onError(String error) {
                        }
                    });
                }
            }

            @Override
            public void onError(String error) {
            }
        });
    }

    private void requestPermissions(String... permissions) {
        if (!hasAllPermissions(permissions)) {
            ActivityCompat.requestPermissions(this, permissions, 1);
        }
    }

    private boolean hasAllPermissions(String... permissions) {
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(this,
                    permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }
}