ContentProvider実装

1.データベースのメタデータの定義

public class BookProviderMetaData 
{
    public static final String AUTHORITY = "com.androidbook.provider.BookProvider";
    
    public static final String DATABASE_NAME = "book.db";
    public static final int DATABASE_VERSION = 1;
    public static final String BOOKS_TABLE_NAME = "books";
    
    private BookProviderMetaData() {}
    //inner class describing columns and their types
    public static final class BookTableMetaData implements BaseColumns 
    {
        private BookTableMetaData() {}
        public static final String TABLE_NAME = "books";

        //uri and mime type definitions
        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/books");
        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.androidbook.book";
        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.androidbook.book";

        public static final String DEFAULT_SORT_ORDER = "modified DESC";
        
        //Additional Columns start here.
        //string type
        public static final String BOOK_NAME = "name";
        //string type
        public static final String BOOK_ISBN = "isbn";
        //string type
        public static final String BOOK_AUTHOR = "author";
        //Integer from System.currentTimeMillis()
        public static final String CREATED_DATE = "created";
        //Integer from System.currentTimeMillis()
        public static final String MODIFIED_DATE = "modified";
    }
}

 2.contentProviderを継承し、重要ないくつかの方法を書き換える
  

package com.test.android.skin.main;

import java.util.List;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.util.Log;

public class Provider extends ContentProvider{

	private SQLiteOpenHelper helper;
	
	@Override
	public boolean onCreate() {
		helper = new SqLHelper(this.getContext());
		return false;
	}

	@Override
	public Cursor query(Uri uri, String[] projection, String selection,
			String[] selectionArgs, String sortOrder) {
		List<String> paths = uri.getPathSegments();
		String tableName = paths.get(0);
		SQLiteDatabase db = helper.getReadableDatabase();
		return db.query(tableName, null, null, null, null, null, null);
	}

	@Override
	public String getType(Uri uri) {
		return null;
	}

	@Override
	public Uri insert(Uri uri, ContentValues values) {
		List<String> paths = uri.getPathSegments();
		String tableName = paths.get(0);
		Log.d("Tag",tableName + ":::"+uri.toString());
		SQLiteDatabase db = helper.getWritableDatabase();
		db.insert(tableName, null, values);
		return uri;
	}

	@Override
	public int delete(Uri uri, String selection, String[] selectionArgs) {
		return 0;
	}

	@Override
	public int update(Uri uri, ContentValues values, String selection,
			String[] selectionArgs) {
		return 0;
	}

}

getTypeはmimeタイプのものを返す必要があり、uriのタイプによって
 
Uriを呼び出す内容は言うまでもない