/NoteContentProvider.java Secret
Created
September 21, 2015 18:33
Android Notepad App Tutorial - this is the way the Content Provider should look like at the start
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| package com.okason.simplenoteapp.data; | |
| import android.content.ContentProvider; | |
| import android.content.ContentValues; | |
| import android.content.UriMatcher; | |
| import android.database.Cursor; | |
| import android.database.sqlite.SQLiteDatabase; | |
| import android.database.sqlite.SQLiteQueryBuilder; | |
| import android.net.Uri; | |
| import android.text.TextUtils; | |
| import com.okason.simplenoteapp.utility.Constants; | |
| import java.util.Arrays; | |
| import java.util.HashSet; | |
| /** | |
| * Created by Valentine on 9/18/2015. | |
| */ | |
| public class NoteContentProvider extends ContentProvider{ | |
| private static final int NOTE = 100; | |
| private static final int NOTES = 101; | |
| private static final String BASE_PATH_NOTE = "notes"; | |
| private static final String AUTHORITY = "com.okason.prontonotes.data.provider"; | |
| public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH_NOTE); | |
| private DatabaseHelper dbHelper; | |
| private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH); | |
| static { | |
| URI_MATCHER.addURI(AUTHORITY, BASE_PATH_NOTE, NOTES); | |
| URI_MATCHER.addURI(AUTHORITY, BASE_PATH_NOTE + "/#", NOTE); | |
| } | |
| private void checkColumns(String[] projection) { | |
| if (projection != null) { | |
| HashSet<String> request = new HashSet<String>(Arrays.asList(projection)); | |
| HashSet<String> available = new HashSet<String>(Arrays.asList(Constants.COLUMNS)); | |
| if (!available.containsAll(request)) { | |
| throw new IllegalArgumentException("Unknown columns in projection"); | |
| } | |
| } | |
| } | |
| @Override | |
| public boolean onCreate() { | |
| dbHelper = new DatabaseHelper(getContext()); | |
| return false; | |
| } | |
| @Override | |
| public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { | |
| SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder(); | |
| checkColumns(projection); | |
| int type = URI_MATCHER.match(uri); | |
| switch (type){ | |
| case NOTE: | |
| //there not to do if the query is for the table | |
| break; | |
| case NOTES: | |
| queryBuilder.appendWhere(Constants.COLUMN_ID + " = " + uri.getLastPathSegment()); | |
| break; | |
| default: | |
| throw new IllegalArgumentException("Unknown URI: " + uri); | |
| } | |
| SQLiteDatabase db = dbHelper.getWritableDatabase(); | |
| Cursor cursor = queryBuilder.query(db, projection, selection, selectionArgs, null, null, sortOrder); | |
| cursor.setNotificationUri(getContext().getContentResolver(), uri); | |
| return cursor; | |
| } | |
| @Override | |
| public String getType(Uri uri) { | |
| return null; | |
| } | |
| @Override | |
| public Uri insert(Uri uri, ContentValues values) { | |
| int type = URI_MATCHER.match(uri); | |
| SQLiteDatabase db = dbHelper.getWritableDatabase(); | |
| Long id; | |
| switch (type){ | |
| case NOTES: | |
| id = db.insert(Constants.NOTES_TABLE, null, values); | |
| break; | |
| default: | |
| throw new IllegalArgumentException("Unknown URI: " + uri); | |
| } | |
| getContext().getContentResolver().notifyChange(uri, null); | |
| return Uri.parse(BASE_PATH_NOTE + "/" + id); | |
| } | |
| @Override | |
| public int delete(Uri uri, String selection, String[] selectionArgs) { | |
| int type = URI_MATCHER.match(uri); | |
| SQLiteDatabase db = dbHelper.getWritableDatabase(); | |
| int affectedRows; | |
| switch (type) { | |
| case NOTES: | |
| affectedRows = db.delete(Constants.NOTES_TABLE, selection, selectionArgs); | |
| break; | |
| case NOTE: | |
| String id = uri.getLastPathSegment(); | |
| if (TextUtils.isEmpty(selection)) { | |
| affectedRows = db.delete(Constants.NOTES_TABLE, Constants.COLUMN_ID + "=" + id, null); | |
| } else { | |
| affectedRows = db.delete(Constants.NOTES_TABLE, Constants.COLUMN_ID + "=" + id + " and " + selection, selectionArgs); | |
| } | |
| break; | |
| default: | |
| throw new IllegalArgumentException("Unknown URI: " + uri); | |
| } | |
| getContext().getContentResolver().notifyChange(uri, null); | |
| return affectedRows; | |
| } | |
| @Override | |
| public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { | |
| int type = URI_MATCHER.match(uri); | |
| SQLiteDatabase db = dbHelper.getWritableDatabase(); | |
| int affectedRows; | |
| switch (type) { | |
| case NOTES: | |
| affectedRows = db.update(Constants.NOTES_TABLE, values, selection, selectionArgs); | |
| break; | |
| case NOTE: | |
| String id = uri.getLastPathSegment(); | |
| if (TextUtils.isEmpty(selection)) { | |
| affectedRows = db.update(Constants.NOTES_TABLE, values, Constants.COLUMN_ID + "=" + id, null); | |
| } else { | |
| affectedRows = db.update(Constants.NOTES_TABLE, values, Constants.COLUMN_ID + "=" + id + " and " + selection, selectionArgs); | |
| } | |
| break; | |
| default: | |
| throw new IllegalArgumentException("Unknown URI: " + uri); | |
| } | |
| getContext().getContentResolver().notifyChange(uri, null); | |
| return affectedRows; | |
| } | |
| } |
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