Android example source code file (LocalProvider.java)

This example Android source code file (LocalProvider.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, content, cursor, data, data_id, database, database_name, databasehelper, illegalargumentexception, localprovider, override, sqlitedatabase, sqliteopenhelper, string, unknown, unsupportedoperationexception, url, util, utilities, utils

The LocalProvider.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.app.activity;

import android.content.UriMatcher;
import android.content.*;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.util.Config;
import android.util.Log;

/** Simple test provider that runs in the local process. */
public class LocalProvider extends ContentProvider {
    private static final String TAG = "LocalProvider";

    private SQLiteOpenHelper mOpenHelper;

    private static final int DATA = 1;
    private static final int DATA_ID = 2;
    private static final UriMatcher sURLMatcher = new UriMatcher(
            UriMatcher.NO_MATCH);

    static {
        sURLMatcher.addURI("*", "data", DATA);
        sURLMatcher.addURI("*", "data/#", DATA_ID);
    }

    private static class DatabaseHelper extends SQLiteOpenHelper {
        private static final String DATABASE_NAME = "local.db";
        private static final int DATABASE_VERSION = 1;

        public DatabaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL("CREATE TABLE data (" +
                       "_id INTEGER PRIMARY KEY," +
                       "text TEXT, " +
                       "integer INTEGER);");

            // insert alarms
            db.execSQL("INSERT INTO data (text, integer) VALUES ('first data', 100);");
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion) {
            Log.w(TAG, "Upgrading test database from version " +
                  oldVersion + " to " + currentVersion +
                  ", which will destroy all old data");
            db.execSQL("DROP TABLE IF EXISTS data");
            onCreate(db);
        }
    }


    public LocalProvider() {
    }

    @Override
    public boolean onCreate() {
        mOpenHelper = new DatabaseHelper(getContext());
        return true;
    }

    @Override
    public Cursor query(Uri url, String[] projectionIn, String selection,
            String[] selectionArgs, String sort) {
        SQLiteQueryBuilder qb = new SQLiteQueryBuilder();

        // Generate the body of the query
        int match = sURLMatcher.match(url);
        switch (match) {
            case DATA:
                qb.setTables("data");
                break;
            case DATA_ID:
                qb.setTables("data");
                qb.appendWhere("_id=");
                qb.appendWhere(url.getPathSegments().get(1));
                break;
            default:
                throw new IllegalArgumentException("Unknown URL " + url);
        }

        SQLiteDatabase db = mOpenHelper.getReadableDatabase();
        Cursor ret = qb.query(db, projectionIn, selection, selectionArgs,
                              null, null, sort);

        if (ret == null) {
            if (Config.LOGD) Log.d(TAG, "Alarms.query: failed");
        } else {
            ret.setNotificationUri(getContext().getContentResolver(), url);
        }

        return ret;
    }

    @Override
    public String getType(Uri url) {
        int match = sURLMatcher.match(url);
        switch (match) {
            case DATA:
                return "vnd.android.cursor.dir/vnd.google.unit_tests.local";
            case DATA_ID:
                return "vnd.android.cursor.item/vnd.google.unit_tests.local";
            default:
                throw new IllegalArgumentException("Unknown URL");
        }
    }

    @Override
    public int update(Uri url, ContentValues values, String where, String[] whereArgs) {
        int count;
        long rowId = 0;
        int match = sURLMatcher.match(url);
        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
        switch (match) {
            case DATA_ID: {
                String segment = url.getPathSegments().get(1);
                rowId = Long.parseLong(segment);
                count = db.update("data", values, "_id=" + rowId, null);
                break;
            }
            default: {
                throw new UnsupportedOperationException(
                        "Cannot update URL: " + url);
            }
        }
        if (Config.LOGD) Log.d(TAG, "*** notifyChange() rowId: " + rowId);
        getContext().getContentResolver().notifyChange(url, null);
        return count;
    }


    @Override
    public Uri insert(Uri url, ContentValues initialValues) {
        return null;
    }

    @Override
    public int delete(Uri url, String where, String[] whereArgs) {
        throw new UnsupportedOperationException("delete not supported");
    }
}