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Android Notepad App Tutorial - this is the way the Content Provider should look like at the start
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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