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saving and retrieving coordinates in shared preferences example
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Langston Smith
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Sep 17, 2019
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247 changes: 247 additions & 0 deletions
247
...o/src/main/java/com/mapbox/mapboxandroiddemo/examples/labs/SharedPreferencesActivity.java
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| package com.mapbox.mapboxandroiddemo.examples.labs; | ||
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| import android.content.SharedPreferences; | ||
| import android.graphics.BitmapFactory; | ||
| import android.os.Bundle; | ||
| import android.preference.PreferenceManager; | ||
| import android.widget.TextView; | ||
| import android.widget.Toast; | ||
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| import com.mapbox.geojson.Point; | ||
| import com.mapbox.mapboxandroiddemo.R; | ||
| import com.mapbox.mapboxsdk.Mapbox; | ||
| import com.mapbox.mapboxsdk.camera.CameraPosition; | ||
| import com.mapbox.mapboxsdk.camera.CameraUpdateFactory; | ||
| import com.mapbox.mapboxsdk.geometry.LatLng; | ||
| import com.mapbox.mapboxsdk.maps.MapView; | ||
| import com.mapbox.mapboxsdk.maps.MapboxMap; | ||
| import com.mapbox.mapboxsdk.maps.OnMapReadyCallback; | ||
| import com.mapbox.mapboxsdk.maps.Style; | ||
| import com.mapbox.mapboxsdk.style.layers.PropertyFactory; | ||
| import com.mapbox.mapboxsdk.style.layers.SymbolLayer; | ||
| import com.mapbox.mapboxsdk.style.sources.GeoJsonSource; | ||
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| import androidx.annotation.NonNull; | ||
| import androidx.appcompat.app.AppCompatActivity; | ||
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| import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap; | ||
| import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconOffset; | ||
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| /** | ||
| * Use shared preferences to save and retrieve data, so that the data can be displayed after closing the app. | ||
| */ | ||
| public class SharedPreferencesActivity extends AppCompatActivity implements OnMapReadyCallback, | ||
| MapboxMap.OnMapClickListener { | ||
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| private static final String SAVED_LAT_KEY = "SAVED_LAT_KEY"; | ||
| private static final String SAVED_LONG_KEY = "SAVED_LONG_KEY"; | ||
| private static final String CLICK_LOCATION_SOURCE_ID = "CLICK_LOCATION_SOURCE_ID"; | ||
| private static final String CLICK_LOCATION_ICON_ID = "CLICK_LOCATION_ICON_ID"; | ||
| private static final String CLICK_LOCATION_LAYER_ID = "CLICK_LOCATION_LAYER_ID"; | ||
| private MapView mapView; | ||
| private MapboxMap mapboxMap; | ||
| private SharedPreferences sharedPreferences; | ||
| private TextView longTextView; | ||
| private TextView latTextView; | ||
| private double savedLat; | ||
| private double savedLong; | ||
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| @Override | ||
| protected void onCreate(Bundle savedInstanceState) { | ||
| super.onCreate(savedInstanceState); | ||
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| sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); | ||
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| // Mapbox access token is configured here. This needs to be called either in your application | ||
| // object or in the same activity which contains the mapview. | ||
| Mapbox.getInstance(this, getString(R.string.access_token)); | ||
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| // This contains the MapView in XML and needs to be called after the access token is configured. | ||
| setContentView(R.layout.activity_lab_shared_preferences); | ||
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| longTextView = findViewById(R.id.shared_pref_saved_long_textview); | ||
| latTextView = findViewById(R.id.shared_pref_saved_lat_textview); | ||
| longTextView.setText(String.format(getString(R.string.saved_long_textview), String.valueOf(0))); | ||
| latTextView.setText(String.format(getString(R.string.saved_lat_textview), String.valueOf(0))); | ||
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| mapView = findViewById(R.id.mapView); | ||
| mapView.onCreate(savedInstanceState); | ||
| mapView.getMapAsync(this); | ||
| } | ||
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| @Override | ||
| public void onMapReady(@NonNull MapboxMap mapboxMap) { | ||
| SharedPreferencesActivity.this.mapboxMap = mapboxMap; | ||
| mapboxMap.setStyle( | ||
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| // Set the map to Mapbox's daytime traffic style | ||
| new Style.Builder().fromUri(Style.TRAFFIC_DAY) | ||
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| // Add the SymbolLayer icon image to the map style | ||
| .withImage(CLICK_LOCATION_ICON_ID, BitmapFactory.decodeResource( | ||
| SharedPreferencesActivity.this.getResources(), R.drawable.red_marker)) | ||
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| // Adding a GeoJson source for the SymbolLayer icons. | ||
| .withSource(new GeoJsonSource(CLICK_LOCATION_SOURCE_ID)) | ||
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| // Adding the actual SymbolLayer to the map style. An offset is added that the bottom of the red | ||
| // marker icon gets fixed to the coordinate, rather than the middle of the icon being fixed to | ||
| // the coordinate point. This is offset is not always needed and is dependent on the image | ||
| // that you use for the SymbolLayer icon. | ||
| .withLayer(new SymbolLayer(CLICK_LOCATION_LAYER_ID, CLICK_LOCATION_SOURCE_ID) | ||
| .withProperties(PropertyFactory.iconImage(CLICK_LOCATION_ICON_ID), | ||
| iconAllowOverlap(true), | ||
| iconOffset(new Float[] {0f, -9f})) | ||
| ), new Style.OnStyleLoaded() { | ||
| @Override | ||
| public void onStyleLoaded(@NonNull Style style) { | ||
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| mapboxMap.addOnMapClickListener(SharedPreferencesActivity.this); | ||
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| // Get the coordinates from shared preferences | ||
| savedLong = getCoordinateFromSharedPref(SAVED_LONG_KEY); | ||
| savedLat = getCoordinateFromSharedPref(SAVED_LAT_KEY); | ||
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| // Coordinates haven't been saved if both == 0 | ||
| if (savedLong == 0 && savedLat == 0) { | ||
| Toast.makeText(SharedPreferencesActivity.this, | ||
| getString(R.string.tap_on_map_save_to_shared_pref), Toast.LENGTH_SHORT).show(); | ||
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| longTextView.setText(String.format(getString(R.string.saved_long_textview), | ||
| getString(R.string.not_saved_yet))); | ||
| latTextView.setText(String.format(getString(R.string.saved_lat_textview), | ||
| getString(R.string.not_saved_yet))); | ||
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| } else { | ||
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| // Move the camera to the previously-saved coordinates | ||
| mapboxMap.animateCamera(CameraUpdateFactory | ||
| .newCameraPosition(new CameraPosition.Builder() | ||
| .target(new LatLng(savedLat, savedLong)) | ||
| .zoom(4) | ||
| .build()), 1200); | ||
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| Toast.makeText(SharedPreferencesActivity.this, | ||
| getString(R.string.shared_pref_marker_placement), Toast.LENGTH_SHORT).show(); | ||
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| // Move the marker to the previously-saved coordinates | ||
| moveMarkerToLngLat(savedLong, savedLat); | ||
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| longTextView.setText(String.format( | ||
| getString(R.string.saved_long_textview), String.valueOf(savedLong))); | ||
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| latTextView.setText(String.format( | ||
| getString(R.string.saved_lat_textview), String.valueOf(savedLat))); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
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| @Override | ||
| public boolean onMapClick(@NonNull LatLng mapClickPoint) { | ||
| double clickLatitude = mapClickPoint.getLatitude(); | ||
| double clickLongitude = mapClickPoint.getLongitude(); | ||
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| longTextView.setText(String.format( | ||
| getString(R.string.saved_long_textview), String.valueOf(clickLongitude))); | ||
| latTextView.setText(String.format( | ||
| getString(R.string.saved_lat_textview), String.valueOf(clickLatitude))); | ||
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| // Save the map click point coordinates to shared preferences | ||
| if (sharedPreferences != null) { | ||
| putCoordinateToSharedPref(SAVED_LAT_KEY, clickLatitude); | ||
| putCoordinateToSharedPref(SAVED_LONG_KEY, clickLongitude); | ||
| } | ||
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| // Move the marker to the newly-saved coordinates | ||
| moveMarkerToLngLat(clickLongitude, clickLatitude); | ||
| return true; | ||
| } | ||
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| /** | ||
| * Move the SymbolLayer icon to a new location | ||
| * | ||
| * @param newLong the new longitude | ||
| * @param newLat the new latitude | ||
| */ | ||
| private void moveMarkerToLngLat(double newLong, double newLat) { | ||
| // Move and display the click center layer's red marker icon to | ||
| // wherever the map was clicked on | ||
| mapboxMap.getStyle(new Style.OnStyleLoaded() { | ||
| @Override | ||
| public void onStyleLoaded(@NonNull Style style) { | ||
| GeoJsonSource clickLocationSource = style.getSourceAs(CLICK_LOCATION_SOURCE_ID); | ||
| if (clickLocationSource != null) { | ||
| clickLocationSource.setGeoJson(Point.fromLngLat(newLong, newLat)); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
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| /** | ||
| * Save a specific number to shared preferences | ||
| * | ||
| * @param key the number's key | ||
| * @param value the actual number | ||
| */ | ||
| private void putCoordinateToSharedPref(final String key, final double value) { | ||
| sharedPreferences.edit().putLong(key, Double.doubleToRawLongBits(value)).apply(); | ||
| } | ||
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| /** | ||
| * Retrieve a specific number from shared preferences | ||
| * | ||
| * @param key the key to use for retrieval | ||
| * @return the saved number | ||
| */ | ||
| double getCoordinateFromSharedPref(final String key) { | ||
| return Double.longBitsToDouble(sharedPreferences.getLong(key, 0)); | ||
| } | ||
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| // Add the mapView lifecycle to the activity's lifecycle methods | ||
| @Override | ||
| public void onResume() { | ||
| super.onResume(); | ||
| mapView.onResume(); | ||
| } | ||
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| @Override | ||
| protected void onStart() { | ||
| super.onStart(); | ||
| mapView.onStart(); | ||
| } | ||
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| @Override | ||
| protected void onStop() { | ||
| super.onStop(); | ||
| mapView.onStop(); | ||
| } | ||
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| @Override | ||
| public void onPause() { | ||
| super.onPause(); | ||
| mapView.onPause(); | ||
| } | ||
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| @Override | ||
| public void onLowMemory() { | ||
| super.onLowMemory(); | ||
| mapView.onLowMemory(); | ||
| } | ||
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| @Override | ||
| protected void onDestroy() { | ||
| super.onDestroy(); | ||
| if (mapboxMap != null) { | ||
| mapboxMap.removeOnMapClickListener(this); | ||
| } | ||
| mapView.onDestroy(); | ||
| } | ||
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| @Override | ||
| protected void onSaveInstanceState(Bundle outState) { | ||
| super.onSaveInstanceState(outState); | ||
| mapView.onSaveInstanceState(outState); | ||
| } | ||
| } |
47 changes: 47 additions & 0 deletions
47
MapboxAndroidDemo/src/main/res/layout/activity_lab_shared_preferences.xml
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| @@ -0,0 +1,47 @@ | ||
| <?xml version="1.0" encoding="utf-8"?> | ||
| <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" | ||
| xmlns:mapbox="http://schemas.android.com/apk/res-auto" | ||
| xmlns:tools="http://schemas.android.com/tools" | ||
| android:layout_width="match_parent" | ||
| android:layout_height="match_parent" | ||
| tools:context=".examples.basics.SimpleMapViewActivity"> | ||
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| <androidx.constraintlayout.widget.Guideline | ||
| android:id="@+id/guideline10" | ||
| android:layout_width="wrap_content" | ||
| android:layout_height="wrap_content" | ||
| android:orientation="horizontal" | ||
| mapbox:layout_constraintGuide_begin="512dp" /> | ||
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| <com.mapbox.mapboxsdk.maps.MapView | ||
| android:id="@+id/mapView" | ||
| android:layout_width="match_parent" | ||
| android:layout_height="0dp" | ||
| mapbox:layout_constraintBottom_toTopOf="@+id/guideline10" | ||
| mapbox:layout_constraintEnd_toEndOf="parent" | ||
| mapbox:layout_constraintStart_toStartOf="parent" | ||
| mapbox:layout_constraintTop_toTopOf="parent" /> | ||
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| <TextView | ||
| android:id="@+id/shared_pref_saved_lat_textview" | ||
| android:layout_width="wrap_content" | ||
| android:layout_height="wrap_content" | ||
| android:layout_marginStart="32dp" | ||
| android:layout_marginLeft="32dp" | ||
| android:layout_marginTop="24dp" | ||
| android:text="@string/saved_lat_textview" | ||
| mapbox:layout_constraintStart_toStartOf="parent" | ||
| mapbox:layout_constraintTop_toTopOf="@+id/guideline10" /> | ||
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| <TextView | ||
| android:id="@+id/shared_pref_saved_long_textview" | ||
| android:layout_width="wrap_content" | ||
| android:layout_height="wrap_content" | ||
| android:layout_marginStart="32dp" | ||
| android:layout_marginLeft="32dp" | ||
| android:layout_marginTop="24dp" | ||
| android:text="@string/saved_long_textview" | ||
| mapbox:layout_constraintStart_toStartOf="parent" | ||
| mapbox:layout_constraintTop_toBottomOf="@+id/shared_pref_saved_lat_textview" /> | ||
|
|
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| </androidx.constraintlayout.widget.ConstraintLayout> |
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