Save Search queries

- update database model for adding a table for saving a query
and its timestamp
- update database version
- save the query when the User tap on a Search result
- remove old queries (no more than 5 are saved)

Change-Id: I4ddff0ad660944c7fd53be64ac95397850dc60d0

src/com/android/settings/dashboard/SearchResultsSummary.java

@@ -18,14 +18,17 @@ package com.android.settings.dashboard;
 
 import android.app.Fragment;
 import android.content.ComponentName;
+import android.content.ContentValues;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
 import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
 import android.graphics.drawable.Drawable;
 import android.os.AsyncTask;
 import android.os.Bundle;
+import android.os.Handler;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -39,9 +42,14 @@ import android.widget.TextView;
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
 import com.android.settings.search.Index;
+import com.android.settings.search.IndexDatabaseHelper;
 
+import java.util.Date;
 import java.util.HashMap;
 
+import static com.android.settings.search.IndexDatabaseHelper.SavedQueriesColums;
+import static com.android.settings.search.IndexDatabaseHelper.Tables;
+
 public class SearchResultsSummary extends Fragment {
 
     private static final String LOG_TAG = "SearchResultsSummary";
@@ -53,6 +61,10 @@ public class SearchResultsSummary extends Fragment {
     private SearchResultsAdapter mAdapter;
     private UpdateSearchResultsTask mUpdateSearchResultsTask;
 
+    private String mQuery;
+    private SaveSearchQueryTask mSaveSearchQueryTask;
+
+    private static long MAX_SAVED_SEARCH_QUERY = 5;
 
     /**
      * A basic AsyncTask for updating the query results cursor
@@ -73,6 +85,41 @@ public class SearchResultsSummary extends Fragment {
         }
     }
 
+    /**
+     * A basic AsynTask for saving the Search query into the database
+     */
+    private class SaveSearchQueryTask extends AsyncTask<String, Void, Long> {
+
+        @Override
+        protected Long doInBackground(String... params) {
+            final long now = new Date().getTime();
+
+            final ContentValues values = new ContentValues();
+            values.put(SavedQueriesColums.QUERY, params[0]);
+            values.put(SavedQueriesColums.TIME_STAMP, now);
+
+            SQLiteDatabase database = IndexDatabaseHelper.getInstance(
+                    getActivity()).getWritableDatabase();
+
+            long lastInsertedRowId = -1;
+            try {
+                lastInsertedRowId =
+                        database.insert(Tables.TABLE_SAVED_QUERIES, null, values);
+
+                final long delta = lastInsertedRowId - MAX_SAVED_SEARCH_QUERY;
+                if (delta > 0) {
+                    int count = database.delete(Tables.TABLE_SAVED_QUERIES, "rowId <= ?",
+                            new String[] { Long.toString(delta) });
+                    Log.d(LOG_TAG, "Deleted '" + count + "' saved Search query(ies)");
+                }
+            } catch (Exception e) {
+                Log.d(LOG_TAG, "Cannot update saved Search queries", e);
+            }
+
+            return lastInsertedRowId;
+        }
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -140,12 +187,25 @@ public class SearchResultsSummary extends Fragment {
 
                     sa.startActivity(intent);
                 }
+
+                saveQueryToDatabase();
             }
         });
 
         return view;
     }
 
+    private void saveQueryToDatabase() {
+        if (mSaveSearchQueryTask != null) {
+            mSaveSearchQueryTask.cancel(false);
+            mSaveSearchQueryTask = null;
+        }
+        if (!TextUtils.isEmpty(mQuery)) {
+            mSaveSearchQueryTask = new SaveSearchQueryTask();
+            mSaveSearchQueryTask.execute(mQuery);
+        }
+    }
+
     public boolean onQueryTextSubmit(String query) {
         updateSearchResults(query);
         return true;
@@ -196,12 +256,12 @@ public class SearchResultsSummary extends Fragment {
             mUpdateSearchResultsTask.cancel(false);
             mUpdateSearchResultsTask = null;
         }
-        final String query = getFilteredQueryString(cs);
+        mQuery = getFilteredQueryString(cs);
-        if (TextUtils.isEmpty(query)) {
+        if (TextUtils.isEmpty(mQuery)) {
             setCursor(null);
         } else {
             mUpdateSearchResultsTask = new UpdateSearchResultsTask();
-            mUpdateSearchResultsTask.execute(query);
+            mUpdateSearchResultsTask.execute(mQuery);
         }
     }
 

src/com/android/settings/search/IndexDatabaseHelper.java

@@ -28,11 +28,12 @@ public class IndexDatabaseHelper extends SQLiteOpenHelper {
     private static final String TAG = "IndexDatabaseHelper";
 
     private static final String DATABASE_NAME = "search_index.db";
-    private static final int DATABASE_VERSION = 111;
+    private static final int DATABASE_VERSION = 112;
 
     public interface Tables {
         public static final String TABLE_PREFS_INDEX = "prefs_index";
         public static final String TABLE_META_INDEX = "meta_index";
+        public static final String TABLE_SAVED_QUERIES = "saved_queries";
     }
 
     public interface IndexColumns {
@@ -61,6 +62,11 @@ public class IndexDatabaseHelper extends SQLiteOpenHelper {
         public static final String BUILD = "build";
     }
 
+    public interface SavedQueriesColums  {
+        public static final String QUERY = "query";
+        public static final String TIME_STAMP = "timestamp";
+    }
+
     private static final String CREATE_INDEX_TABLE =
             "CREATE VIRTUAL TABLE " + Tables.TABLE_PREFS_INDEX + " USING fts4" +
                     "(" +
@@ -107,6 +113,14 @@ public class IndexDatabaseHelper extends SQLiteOpenHelper {
                     MetaColumns.BUILD + " VARCHAR(32) NOT NULL" +
                     ")";
 
+    private static final String CREATE_SAVED_QUERIES_TABLE =
+            "CREATE TABLE " + Tables.TABLE_SAVED_QUERIES +
+                    "(" +
+                    SavedQueriesColums.QUERY + " VARCHAR(64) NOT NULL" +
+                    ", " +
+                    SavedQueriesColums.TIME_STAMP + " INTEGER" +
+                    ")";
+
     private static final String INSERT_BUILD_VERSION =
             "INSERT INTO " + Tables.TABLE_META_INDEX +
                     " VALUES ('" + Build.VERSION.INCREMENTAL + "');";
@@ -135,6 +149,7 @@ public class IndexDatabaseHelper extends SQLiteOpenHelper {
     private void bootstrapDB(SQLiteDatabase db) {
         db.execSQL(CREATE_INDEX_TABLE);
         db.execSQL(CREATE_META_TABLE);
+        db.execSQL(CREATE_SAVED_QUERIES_TABLE);
         db.execSQL(INSERT_BUILD_VERSION);
         Log.i(TAG, "Bootstrapped database");
     }
@@ -200,5 +215,6 @@ public class IndexDatabaseHelper extends SQLiteOpenHelper {
     private void dropTables(SQLiteDatabase db) {
         db.execSQL("DROP TABLE IF EXISTS " + Tables.TABLE_META_INDEX);
         db.execSQL("DROP TABLE IF EXISTS " + Tables.TABLE_PREFS_INDEX);
+        db.execSQL("DROP TABLE IF EXISTS " + Tables.TABLE_SAVED_QUERIES);
     }
 }