Added a button to clear all recent searches. (#1487)

* Added a button to clear all recent searches.
- Deletes all the searches for the current user from the database.
-  Delete icon placed at the end of subreddit name layout in the activity search layout(I couldn't find a better place for it).
_Icon visible only when there are recent searches.

* Confirmation dialog shows when clearing all search history.

3 files changed, 77 insertions, 0 deletions

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/SearchActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/SearchActivity.java
index 4bf0bcfa..3e786f2c 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/SearchActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/SearchActivity.java
@@ -47,6 +47,7 @@ import ml.docilealligator.infinityforreddit.apis.RedditAPI;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.slidr.Slidr;
 import ml.docilealligator.infinityforreddit.events.SwitchAccountEvent;
+import ml.docilealligator.infinityforreddit.recentsearchquery.DeleteAllRecentSearchQueries;
 import ml.docilealligator.infinityforreddit.recentsearchquery.DeleteRecentSearchQuery;
 import ml.docilealligator.infinityforreddit.recentsearchquery.RecentSearchQuery;
 import ml.docilealligator.infinityforreddit.recentsearchquery.RecentSearchQueryViewModel;
@@ -95,6 +96,8 @@ public class SearchActivity extends BaseActivity {
     ImageView clearSearchTextImageView;
     @BindView(R.id.link_handler_image_view_search_activity)
     ImageView linkHandlerImageView;
+    @BindView(R.id.delete_all_recent_searches_image_view_search_activity)
+    ImageView deleteAllSearchesImageView;
     @BindView(R.id.subreddit_name_relative_layout_search_activity)
     RelativeLayout subredditNameRelativeLayout;
     @BindView(R.id.search_in_text_view_search_activity)
@@ -156,6 +159,7 @@ public class SearchActivity extends BaseActivity {
         setSupportActionBar(toolbar);
 
         clearSearchTextImageView.setVisibility(View.GONE);
+        deleteAllSearchesImageView.setVisibility(View.GONE);
 
         searchOnlySubreddits = getIntent().getBooleanExtra(EXTRA_SEARCH_ONLY_SUBREDDITS, false);
         searchOnlyUsers = getIntent().getBooleanExtra(EXTRA_SEARCH_ONLY_USERS, false);
@@ -269,6 +273,10 @@ public class SearchActivity extends BaseActivity {
             }
         });
 
+        deleteAllSearchesImageView.setOnClickListener(view -> {
+            DeleteAllRecentSearchQueries.deleteAllRecentSearchQueriesListener(this,mRedditDataRoomDatabase,mAccountName, () -> {});
+        });
+
         if (savedInstanceState != null) {
             subredditName = savedInstanceState.getString(SUBREDDIT_NAME_STATE);
             subredditIsUser = savedInstanceState.getBoolean(SUBREDDIT_IS_USER_STATE);
@@ -326,8 +334,10 @@ public class SearchActivity extends BaseActivity {
                 mRecentSearchQueryViewModel.getAllRecentSearchQueries().observe(this, recentSearchQueries -> {
                     if (recentSearchQueries != null && !recentSearchQueries.isEmpty()) {
                         divider.setVisibility(View.VISIBLE);
+                        deleteAllSearchesImageView.setVisibility(View.VISIBLE);
                     } else {
                         divider.setVisibility(View.GONE);
+                        deleteAllSearchesImageView.setVisibility(View.GONE);
                     }
                     adapter.setRecentSearchQueries(recentSearchQueries);
                 });
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/DeleteAllRecentSearchQueries.java b/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/DeleteAllRecentSearchQueries.java
new file mode 100644
index 00000000..1aeac1d3
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/DeleteAllRecentSearchQueries.java
@@ -0,0 +1,64 @@
+package ml.docilealligator.infinityforreddit.recentsearchquery;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.AsyncTask;
+
+import ml.docilealligator.infinityforreddit.R;
+import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
+
+public class DeleteAllRecentSearchQueries {
+    public static void deleteAllRecentSearchQueriesListener(Context context, RedditDataRoomDatabase redditDataRoomDatabase, String username,
+                                                            DeleteAllRecentSearchQueriesListener deleteAllRecentSearchQueriesListener) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(context);
+        builder.setTitle(R.string.confirm);
+        builder.setMessage(R.string.confirm_delete_all_recent_searches);
+        builder.setPositiveButton(context.getString(R.string.yes), new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                new DeleteRecentSearchQueryAsyncTask(context, redditDataRoomDatabase, username, deleteAllRecentSearchQueriesListener).execute();
+            }
+        });
+        builder.setNegativeButton(context.getString(R.string.no), new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+            }
+        });
+        AlertDialog dialog = builder.create();
+        dialog.show();
+    }
+
+    public interface DeleteAllRecentSearchQueriesListener {
+        void success();
+    }
+
+    private static class DeleteRecentSearchQueryAsyncTask extends AsyncTask<Void, Void, Void> {
+
+        private RecentSearchQueryDao recentSearchQueryDao;
+        private String username;
+        private DeleteAllRecentSearchQueriesListener deleteAllRecentSearchQueriesListener;
+        private Context context;
+
+        public DeleteRecentSearchQueryAsyncTask(Context context, RedditDataRoomDatabase redditDataRoomDatabase,
+                                                String username,
+                                                DeleteAllRecentSearchQueriesListener deleteRecentSearchQueryListener) {
+            this.recentSearchQueryDao = redditDataRoomDatabase.recentSearchQueryDao();
+            this.username = username;
+            this.deleteAllRecentSearchQueriesListener = deleteRecentSearchQueryListener;
+            this.context = context;
+        }
+
+        @Override
+        protected Void doInBackground(Void... voids) {
+            recentSearchQueryDao.deleteAllRecentSearchQueries(username);
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void aVoid) {
+            super.onPostExecute(aVoid);
+            deleteAllRecentSearchQueriesListener.success();
+        }
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/RecentSearchQueryDao.java b/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/RecentSearchQueryDao.java
index ae3ec0ee..407b5614 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/RecentSearchQueryDao.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/recentsearchquery/RecentSearchQueryDao.java
@@ -20,6 +20,9 @@ public interface RecentSearchQueryDao {
     @Query("SELECT * FROM recent_search_queries WHERE username = :username ORDER BY time DESC")
     List<RecentSearchQuery> getAllRecentSearchQueries(String username);
 
+    @Query("DELETE FROM recent_search_queries WHERE username = :username")
+    void deleteAllRecentSearchQueries(String username);
+
     @Delete
     void deleteRecentSearchQueries(RecentSearchQuery recentSearchQuery);
 }