Fix memory leak(s). (#2674)

app/src/main/java/fr/free/nrw/commons/category/GridViewAdapter.java

@@ -1,6 +1,5 @@
 package fr.free.nrw.commons.category;
 
-import android.app.Activity;
 import android.content.Context;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
@@ -22,12 +21,10 @@ import fr.free.nrw.commons.R;
  */
 
 public class GridViewAdapter extends ArrayAdapter {
-    private Context context;
     private List<Media> data;
 
     public GridViewAdapter(Context context, int layoutResourceId, List<Media> data) {
         super(context, layoutResourceId, data);
-        this.context = context;
         this.data = data;
     }
 
@@ -81,8 +78,7 @@ public class GridViewAdapter extends ArrayAdapter {
     public View getView(int position, View convertView, ViewGroup parent) {
 
         if (convertView == null) {
-            LayoutInflater inflater = ((Activity) context).getLayoutInflater();
+            convertView = LayoutInflater.from(getContext()).inflate(R.layout.layout_category_images, null);
-            convertView = inflater.inflate(R.layout.layout_category_images, null);
         }
 
         Media item = data.get(position);
@@ -102,7 +98,7 @@ public class GridViewAdapter extends ArrayAdapter {
      */
     private void setAuthorView(Media item, TextView author) {
         if (!TextUtils.isEmpty(item.getCreator())) {
-            String uploadedByTemplate = context.getString(R.string.image_uploaded_by);
+            String uploadedByTemplate = getContext().getString(R.string.image_uploaded_by);
 
             String uploadedBy = String.format(Locale.getDefault(), uploadedByTemplate, item.getCreator());
             author.setText(uploadedBy);

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java

@@ -87,6 +87,7 @@ public class ContributionsFragment
     @Inject NearbyController nearbyController;
     @Inject OkHttpJsonApiClient okHttpJsonApiClient;
     @Inject CampaignsPresenter presenter;
+    @Inject LocationServiceManager locationManager;
 
     private ArrayList<DataSetObserver> observersWaitingForLoad = new ArrayList<>();
     private UploadService uploadService;
@@ -105,8 +106,6 @@ public class ContributionsFragment
     private LatLng curLatLng;
 
     private boolean firstLocationUpdate = true;
-    public LocationServiceManager locationManager;
-
     private boolean isFragmentAttachedBefore = false;
     private View checkBoxView;
     private CheckBox checkBox;
@@ -496,7 +495,6 @@ public class ContributionsFragment
     @Override
     public void onResume() {
         super.onResume();
-        locationManager = new LocationServiceManager(getActivity());
 
         firstLocationUpdate = true;
         locationManager.addLocationListener(this);
@@ -546,7 +544,7 @@ public class ContributionsFragment
 
     private void checkLocationPermission() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            if (locationManager.isLocationPermissionGranted()) {
+            if (locationManager.isLocationPermissionGranted(requireContext())) {
                 nearbyNotificationCardView.permissionType = NearbyNotificationCardView.PermissionType.NO_PERMISSION_NEEDED;
                 locationManager.registerLocationManager();
             } else {
@@ -638,8 +636,6 @@ public class ContributionsFragment
         getChildFragmentManager().removeOnBackStackChangedListener(this);
         locationManager.unregisterLocationManager();
         locationManager.removeLocationListener(this);
-        // Try to prevent a possible NPE
-        locationManager.context = null;
         super.onDestroy();
 
         if (isUploadServiceConnected) {

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsListAdapter.java

@@ -2,6 +2,8 @@ package fr.free.nrw.commons.contributions;
 
 import android.content.Context;
 import android.database.Cursor;
+
+import androidx.annotation.NonNull;
 import androidx.cursoradapter.widget.CursorAdapter;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -20,14 +22,12 @@ class ContributionsListAdapter extends CursorAdapter {
 
     private final ContributionDao contributionDao;
     private UploadService uploadService;
-    private Context context;
 
     public ContributionsListAdapter(Context context,
                                     Cursor c,
                                     int flags,
                                     ContributionDao contributionDao) {
         super(context, c, flags);
-        this.context = context;
         this.contributionDao = contributionDao;
     }
 
@@ -53,12 +53,12 @@ class ContributionsListAdapter extends CursorAdapter {
                 new DisplayableContribution.ContributionActions() {
                     @Override
                     public void retryUpload() {
-                        ContributionsListAdapter.this.retryUpload(contribution);
+                        ContributionsListAdapter.this.retryUpload(view.getContext(), contribution);
                     }
 
                     @Override
                     public void deleteUpload() {
-                        ContributionsListAdapter.this.deleteUpload(contribution);
+                        ContributionsListAdapter.this.deleteUpload(view.getContext(), contribution);
                     }
                 });
         views.bindModel(context, displayableContribution);
@@ -68,7 +68,7 @@ class ContributionsListAdapter extends CursorAdapter {
      * Retry upload when it is failed
      * @param contribution contribution to be retried
      */
-    private void retryUpload(Contribution contribution) {
+    private void retryUpload(@NonNull Context context, Contribution contribution) {
         if (NetworkUtils.isInternetConnectionEstablished(context)) {
             if (contribution.getState() == STATE_FAILED
                     && uploadService!= null) {
@@ -87,7 +87,7 @@ class ContributionsListAdapter extends CursorAdapter {
      * Delete a failed upload attempt
      * @param contribution contribution to be deleted
      */
-    private void deleteUpload(Contribution contribution) {
+    private void deleteUpload(@NonNull Context context, Contribution contribution) {
         if (NetworkUtils.isInternetConnectionEstablished(context)) {
             if (contribution.getState() == STATE_FAILED) {
                 Timber.d("Deleting failed contrib %s", contribution.toString());

app/src/main/java/fr/free/nrw/commons/location/LocationServiceManager.java

@@ -9,6 +9,8 @@ import android.location.Location;
 import android.location.LocationListener;
 import android.location.LocationManager;
 import android.os.Bundle;
+
+import androidx.annotation.NonNull;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 
@@ -26,13 +28,12 @@ public class LocationServiceManager implements LocationListener {
     private static final long MIN_LOCATION_UPDATE_REQUEST_TIME_IN_MILLIS = 2 * 60 * 100;
     private static final long MIN_LOCATION_UPDATE_REQUEST_DISTANCE_IN_METERS = 10;
 
-    public Context context;
     private LocationManager locationManager;
     private Location lastLocation;
     //private Location lastLocationDuplicate; // Will be used for nearby card view on contributions activity
     private final List<LocationUpdateListener> locationListeners = new CopyOnWriteArrayList<>();
     private boolean isLocationManagerRegistered = false;
-    public Set<Activity> locationExplanationDisplayed = new HashSet<>();
+    private Set<Activity> locationExplanationDisplayed = new HashSet<>();
 
     /**
      * Constructs a new instance of LocationServiceManager.
@@ -40,7 +41,6 @@ public class LocationServiceManager implements LocationListener {
      * @param context the context
      */
     public LocationServiceManager(Context context) {
-        this.context = context;
         this.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
     }
 
@@ -57,7 +57,7 @@ public class LocationServiceManager implements LocationListener {
      * Returns whether the location permission is granted.
      * @return true if the location permission is granted
      */
-    public boolean isLocationPermissionGranted() {
+    public boolean isLocationPermissionGranted(@NonNull Context context) {
         return ContextCompat.checkSelfPermission(context,
                 Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED;
     }
@@ -101,8 +101,8 @@ public class LocationServiceManager implements LocationListener {
      * @return last known LatLng
      */
     @SuppressLint("MissingPermission")
-    public LatLng getLKL() {
+    public LatLng getLKL(@NonNull Context context) {
-        if (isLocationPermissionGranted()) {
+        if (isLocationPermissionGranted(context)) {
             Location lastKL = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
             if (lastKL == null) {
                 lastKL = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
@@ -225,6 +225,7 @@ public class LocationServiceManager implements LocationListener {
      */
     public void unregisterLocationManager() {
         isLocationManagerRegistered = false;
+        locationExplanationDisplayed.clear();
         try {
             locationManager.removeUpdates(this);
         } catch (SecurityException e) {

app/src/main/java/fr/free/nrw/commons/nearby/NearbyFragment.java

@@ -572,7 +572,7 @@ public class NearbyFragment extends CommonsDaggerSupportFragment
      */
     private void registerLocationUpdates() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            if (locationManager.isLocationPermissionGranted()) {
+            if (locationManager.isLocationPermissionGranted(requireContext())) {
                 locationManager.registerLocationManager();
             } else {
                 // Should we show an explanation?
@@ -666,7 +666,7 @@ public class NearbyFragment extends CommonsDaggerSupportFragment
     private void checkLocationPermission() {
         Timber.d("Checking location permission");
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            if (locationManager.isLocationPermissionGranted()) {
+            if (locationManager.isLocationPermissionGranted(requireContext())) {
                 refreshView(LOCATION_SIGNIFICANTLY_CHANGED);
             } else {
                 // Should we show an explanation?

app/src/main/java/fr/free/nrw/commons/nearby/NearbyNotificationCardView.java

@@ -21,9 +21,6 @@ import timber.log.Timber;
  * Custom card view for nearby notification card view on main screen, above contributions list
  */
 public class NearbyNotificationCardView extends SwipableCardView {
-
-    private Context context;
-
     private Button permissionRequestButton;
     private LinearLayout contentLayout;
     private TextView notificationTitle;
@@ -37,21 +34,18 @@ public class NearbyNotificationCardView extends SwipableCardView {
 
     public NearbyNotificationCardView(@NonNull Context context) {
         super(context);
-        this.context = context;
         cardViewVisibilityState = CardViewVisibilityState.INVISIBLE;
         init();
     }
 
     public NearbyNotificationCardView(@NonNull Context context, @Nullable AttributeSet attrs) {
         super(context, attrs);
-        this.context = context;
         cardViewVisibilityState = CardViewVisibilityState.INVISIBLE;
         init();
     }
 
     public NearbyNotificationCardView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
-        this.context = context;
         cardViewVisibilityState = CardViewVisibilityState.INVISIBLE;
         init();
     }
@@ -60,7 +54,7 @@ public class NearbyNotificationCardView extends SwipableCardView {
      * Initializes views and action listeners
      */
     private void init() {
-        View rootView = inflate(context, R.layout.nearby_card_view, this);
+        View rootView = inflate(getContext(), R.layout.nearby_card_view, this);
 
         permissionRequestButton = rootView.findViewById(R.id.permission_request_button);
         contentLayout = rootView.findViewById(R.id.content_layout);
@@ -79,7 +73,7 @@ public class NearbyNotificationCardView extends SwipableCardView {
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
         // If you don't setVisibility after getting layout params, then you will se an empty space in place of nearby NotificationCardView
-        if (((MainActivity)context).defaultKvStore.getBoolean("displayNearbyCardView", true) && this.cardViewVisibilityState == NearbyNotificationCardView.CardViewVisibilityState.READY) {
+        if (((MainActivity)getContext()).defaultKvStore.getBoolean("displayNearbyCardView", true) && this.cardViewVisibilityState == NearbyNotificationCardView.CardViewVisibilityState.READY) {
             this.setVisibility(VISIBLE);
         } else {
             this.setVisibility(GONE);
@@ -88,14 +82,14 @@ public class NearbyNotificationCardView extends SwipableCardView {
 
 
     private void setActionListeners() {
-        this.setOnClickListener(view -> ((MainActivity)context).viewPager.setCurrentItem(1));
+        this.setOnClickListener(view -> ((MainActivity)getContext()).viewPager.setCurrentItem(1));
     }
 
     @Override public boolean onSwipe(View view) {
         view.setVisibility(GONE);
         // Save shared preference for nearby card view accordingly
-        ((MainActivity) context).defaultKvStore.putBoolean("displayNearbyCardView", false);
+        ((MainActivity) getContext()).defaultKvStore.putBoolean("displayNearbyCardView", false);
-        ViewUtil.showLongToast(context,
+        ViewUtil.showLongToast(getContext(),
             getResources().getString(R.string.nearby_notification_dismiss_message));
         return true;
     }