Created a content provider a map locations database.

app/src/main/AndroidManifest.xml

@@ -55,6 +55,11 @@
                     android:scheme="https" />
             </intent-filter>
         </activity>
+
+        <provider
+            android:name="in.ac.iitb.gymkhana.iitbapp.data.IITBAppContentProvider"
+            android:authorities="in.ac.iitb.gymkhana.iitbapp"
+            android:exported="false" />
     </application>
 
 </manifest>
\ No newline at end of file

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/data/DatabaseContract.java

+package in.ac.iitb.gymkhana.iitbapp.data;
+
+import android.net.Uri;
+import android.provider.BaseColumns;
+
+public class DatabaseContract {
+    public static final String CONTENT_AUTHORITY = "in.ac.iitb.gymkhana.iitbapp";
+    public static final Uri BASE_CONTENT_URI = Uri.parse("content://" + CONTENT_AUTHORITY);
+    public static final String PATH_MAP = "map";
+
+    public static final class MapEntry implements BaseColumns {
+        public static final Uri CONTENT_URI = BASE_CONTENT_URI.buildUpon()
+                .appendPath(PATH_MAP)
+                .build();
+        public static final String TABLE_NAME = "map";
+        public static final String COLUMN_LATITUDE = "latitude";
+        public static final String COLUMN_LONGITUDE = "longitude";
+        public static final String COLUMN_NAME = "name";
+        public static final String COLUMN_TYPE = "type";
+
+
+    }
+}

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/data/IITBAppContentProvider.java

+package in.ac.iitb.gymkhana.iitbapp.data;
+
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.SQLException;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import static in.ac.iitb.gymkhana.iitbapp.data.DatabaseContract.MapEntry.TABLE_NAME;
+
+
+public class IITBAppContentProvider extends ContentProvider {
+    public static final int LOCS = 100;
+    public static final int LOC_WITH_ID = 101;
+    private static final UriMatcher sUriMatcher = buildUriMatcher();
+    private MapDbHelper mapDbHelper;
+
+    public static UriMatcher buildUriMatcher() {
+        final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
+        matcher.addURI(DatabaseContract.CONTENT_AUTHORITY, DatabaseContract.PATH_MAP, LOCS);
+        matcher.addURI(DatabaseContract.CONTENT_AUTHORITY, DatabaseContract.PATH_MAP + "/#", LOC_WITH_ID);
+        return matcher;
+
+    }
+
+    @Override
+    public boolean onCreate() {
+        Context context = getContext();
+        mapDbHelper = new MapDbHelper(context);
+        return true;
+    }
+
+    @Nullable
+    @Override
+    public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection, @Nullable String[] selectionArgs, @Nullable String sortOrder) {
+        final SQLiteDatabase db = mapDbHelper.getReadableDatabase();
+        int match = sUriMatcher.match(uri);
+        Cursor cursor;
+        switch (match) {
+            case LOCS:
+                cursor = db.query(TABLE_NAME,
+                        projection,
+                        selection,
+                        selectionArgs,
+                        null,
+                        null,
+                        sortOrder);
+                break;
+            case LOC_WITH_ID:
+                String id = uri.getPathSegments().get(1);
+                String[] selectionArguments = new String[]{id};
+                cursor = db.query(TABLE_NAME,
+                        projection,
+                        "_id=?",
+                        selectionArguments,
+                        null,
+                        null,
+                        sortOrder);
+                break;
+            default:
+                throw new SQLException("Wrong Uri: " + uri);
+
+        }
+        cursor.setNotificationUri(getContext().getContentResolver(), uri);
+        return cursor;
+    }
+
+    @Nullable
+    @Override
+    public String getType(@NonNull Uri uri) {
+
+        int match = sUriMatcher.match(uri);
+        switch (match) {
+            case LOCS:
+                return "vnd.android.cursor.dir" + "/" + DatabaseContract.CONTENT_AUTHORITY + "/" + DatabaseContract.PATH_MAP;
+            case LOC_WITH_ID:
+                return "vnd.android.cursor.item" + "/" + DatabaseContract.CONTENT_AUTHORITY + "/" + DatabaseContract.PATH_MAP;
+            default:
+                throw new UnsupportedOperationException("Unknown uri: " + uri);
+        }
+    }
+
+    @Nullable
+    @Override
+    public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
+        final SQLiteDatabase db = mapDbHelper.getWritableDatabase();
+        int match = sUriMatcher.match(uri);
+        Uri returnUri;
+        switch (match) {
+            case LOCS:
+                long id = db.insert(TABLE_NAME, null, values);
+                if (id > 0) {
+                    returnUri = ContentUris.withAppendedId(DatabaseContract.MapEntry.CONTENT_URI, id);
+                } else
+                    throw new SQLException("Failed to insert row into " + uri);
+                break;
+            default:
+                throw new SQLException("Wrong uri: " + uri);
+
+        }
+        getContext().getContentResolver().notifyChange(uri, null);
+        return returnUri;
+    }
+
+    @Override
+    public int bulkInsert(@NonNull Uri uri, @NonNull ContentValues[] values) {
+        final SQLiteDatabase db = mapDbHelper.getWritableDatabase();
+
+        switch (sUriMatcher.match(uri)) {
+
+            case LOCS:
+                db.beginTransaction();
+                int rowsInserted = 0;
+                try {
+                    for (ContentValues value : values) {
+
+
+                        long _id = db.insert(TABLE_NAME, null, value);
+                        if (_id != -1) {
+                            rowsInserted++;
+                        }
+                    }
+                    db.setTransactionSuccessful();
+                } finally {
+                    db.endTransaction();
+                }
+
+                if (rowsInserted > 0) {
+                    getContext().getContentResolver().notifyChange(uri, null);
+                }
+
+                return rowsInserted;
+
+            default:
+                return super.bulkInsert(uri, values);
+        }
+    }
+
+    @Override
+    public int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {
+        int numRowsDeleted;
+
+        if (null == selection) selection = "1";
+
+        switch (sUriMatcher.match(uri)) {
+
+            case LOCS:
+                numRowsDeleted = mapDbHelper.getWritableDatabase().delete(
+                        TABLE_NAME,
+                        selection,
+                        selectionArgs);
+
+                break;
+            case LOC_WITH_ID:
+
+                String id = uri.getPathSegments().get(1);
+
+                numRowsDeleted = mapDbHelper.getWritableDatabase().delete(TABLE_NAME, "_id=?", new String[]{id});
+                break;
+
+            default:
+                throw new UnsupportedOperationException("Unknown uri: " + uri);
+        }
+
+
+        if (numRowsDeleted != 0) {
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+
+        return numRowsDeleted;
+    }
+
+
+    @Override
+    public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {
+
+        int itemsUpdated;
+
+
+        int match = sUriMatcher.match(uri);
+
+        switch (match) {
+            case LOC_WITH_ID:
+
+                String id = uri.getPathSegments().get(1);
+
+                itemsUpdated = mapDbHelper.getWritableDatabase().update(TABLE_NAME, values, "_id=?", new String[]{id});
+                break;
+            default:
+                throw new UnsupportedOperationException("Unknown uri: " + uri);
+        }
+
+        if (itemsUpdated != 0) {
+
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+
+
+        return itemsUpdated;
+    }
+}
+

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/data/MapDbHelper.java

+package in.ac.iitb.gymkhana.iitbapp.data;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+
+public class MapDbHelper extends SQLiteOpenHelper {
+    private static final String DATABASE_NAME = "mapDb.db";
+    private static final int VERSION = 1;
+
+    MapDbHelper(Context context) {
+        super(context, DATABASE_NAME, null, VERSION);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        final String CREATE_TABLE = "CREATE TABLE " + DatabaseContract.MapEntry.TABLE_NAME + " (" +
+                DatabaseContract.MapEntry._ID + " INTEGER PRIMARY KEY, " +
+                DatabaseContract.MapEntry.COLUMN_LATITUDE + " DOUBLE NOT NULL, " +
+                DatabaseContract.MapEntry.COLUMN_LONGITUDE + " DOUBLE NOT NULL, " +
+                DatabaseContract.MapEntry.COLUMN_NAME + " TEXT NOT NULL, " +
+                DatabaseContract.MapEntry.COLUMN_TYPE + " TEXT NOT NULL);";
+
+        db.execSQL(CREATE_TABLE);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        db.execSQL("DROP TABLE IF EXISTS " + DatabaseContract.MapEntry.TABLE_NAME);
+        onCreate(db);
+    }
+}