Androidカスタムコンテンツプロバイダ使用

     android  ，              ，                        ，                     。    contentProvider,                 uri,    contentResolver   ，getContentResolver()             contentProvider         。

/** * Description：                   <br/> * Copyright (c) , 2016, Jansonxu <br/> * This program is protected by copyright laws. <br/> * Program Name:UserContentProvider.java <br/> * Date: 2016 3 9  * * @author    * @version : 1.0 */
package com.example.contentprovider.provider;



import com.example.contentprovider.util.Dbhelper;

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

public class UserContentProvider extends ContentProvider {

    //①     ContentProvider               +             (    。      )
    //             
    public static final String AUTHORITY = "com.example.contentprovider.user_1";

    //②                     CODE  
    public static final int CODE_USER = 1;
    public static final int CODE_ORDER = 2;

    //③   UriMatcher           
    public static UriMatcher uriMatcher;  //    uri

    //                
    static{

        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);//

        //  t_user    Uri content://com.example.contentprovider.user_1/user
        uriMatcher.addURI(AUTHORITY, "user", CODE_USER); //path       

        uriMatcher.addURI(AUTHORITY, "order", CODE_ORDER); //path       


    }

    /* * */

    private Dbhelper dbHelper;
    @Override
    public boolean onCreate() {

        //    
        dbHelper = new Dbhelper(getContext());

        return false;
    }

    /* (non-Javadoc) * @see android.content.ContentProvider#query(android.net.Uri, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String) */
    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {

        int code =  uriMatcher.match(uri);//      uri    code   
        Cursor cursor = null;

        SQLiteDatabase db = dbHelper.getReadableDatabase();

        switch (code) {

        case CODE_USER:



            //       t_user                   User     
            cursor = db.query("t_user", projection, selection, selectionArgs, null, null, sortOrder);

            break;

        case CODE_ORDER:

            break;

        default:
            break;
        }

        return cursor;
    }



    /* (non-Javadoc) * @see android.content.ContentProvider#getType(android.net.Uri) */
    @Override
    public String getType(Uri uri) {
        // TODO Auto-generated method stub
        return null;
    }

    /* (non-Javadoc) * @see android.content.ContentProvider#insert(android.net.Uri, android.content.ContentValues) */
    @Override
    public Uri insert(Uri uri, ContentValues values) {

        SQLiteDatabase db = dbHelper.getWritableDatabase();
        if(uriMatcher.match(uri)==UserContentProvider.CODE_USER){
            long id = db.insert("t_user", null, values);
              return ContentUris.withAppendedId(uri, id);
        }

        return null;
    }

    /* (non-Javadoc) * @see android.content.ContentProvider#delete(android.net.Uri, java.lang.String, java.lang.String[]) */
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {

        SQLiteDatabase db = dbHelper.getWritableDatabase();
        int num = 0;
        if(uriMatcher.match(uri)==UserContentProvider.CODE_USER){
            num = db.delete("t_user", selection, selectionArgs);
        }
        return num;

    }

    /* (non-Javadoc) * @see android.content.ContentProvider#update(android.net.Uri, android.content.ContentValues, java.lang.String, java.lang.String[]) */
    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {

        SQLiteDatabase db = dbHelper.getWritableDatabase();
        if(uriMatcher.match(uri)==UserContentProvider.CODE_USER){

            db.update("t_user", values, selection, selectionArgs); 

        }



        return 0;
    }


}