关于Android sqlite3数据库创建使用内容提供者contentProvider及解析者ContentResolver，观察者ContentResolver案例

数据库创建

package com.jms.rbclient.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
* Created by liying on 2016/12/27.
*/

public class ProductDBOpenHelper extends SQLiteOpenHelper {
public ProductDBOpenHelper(Context context) {
super(context, "product.db", null, 1);

}

/**
* userid 用户id
* productid 产品id
* prodNum  数量id
* proPropertyid 属性id
* @param db
*/
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table proinfo (_id integer primary key autoincrement,userid varchar(20),productid varchar(20),prodNum varchar(20),proPropertycolorid varchar(20),proPropertysizeid varchar(20))");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}
}

Androidmanifest节点配置

<provider
android:name=".db.ContentProvider.CarContentProvider"
android:authorities="com.jms.rbclient"
android:enabled="true"
android:exported="true"/>

内容提供者主要代码

package com.jms.rbclient.db.ContentProvider;

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

import com.jms.rbclient.db.ProductDBOpenHelper;

public class CarContentProvider extends ContentProvider {

private static final int SUCCESS = 1;

static UriMatcher mUriMatcher=new UriMatcher(UriMatcher.NO_MATCH);

static {

mUriMatcher.addURI("com.jms.rbclient","proinfo",SUCCESS);
}

内容提供者 删除数据

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
// Implement this to handle requests to delete one or more rows.

int code = mUriMatcher.match(uri);
if(code==SUCCESS){
ProductDBOpenHelper helper=new ProductDBOpenHelper(getContext());
final SQLiteDatabase db = helper.getWritableDatabase();
db.delete("proinfo",selection,selectionArgs);
getContext().getContentResolver().notifyChange(uri,null);
}else{

throw new UnsupportedOperationException("Not yet implemented");
}
return 0;
}

@Override
public String getType(Uri uri) {
// at the given URI.
throw new UnsupportedOperationException("Not yet implemented");
}

@Override
public Uri insert(Uri uri, ContentValues values) {

final int code = mUriMatcher.match(uri);
if(code==SUCCESS){
ProductDBOpenHelper helper=new ProductDBOpenHelper(getContext());
final SQLiteDatabase db = helper.getWritableDatabase();
db.insert("proinfo",null,values);
getContext().getContentResolver().notifyChange(uri,null);
}else{

throw new UnsupportedOperationException("Not yet implemented");
}
return null;

}

@Override
public boolean onCreate() {
return false;
}

@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {

final int code = mUriMatcher.match(uri);
if(code==SUCCESS){
ProductDBOpenHelper helper=new ProductDBOpenHelper(getContext());
final SQLiteDatabase db = helper.getWritableDatabase();
final Cursor cursor = db.query("proinfo", projection, selection, selectionArgs, null, null, sortOrder);
getContext().getContentResolver().notifyChange(uri,null);
return  cursor;
}else{

throw new UnsupportedOperationException("Not yet implemented");
}

}

@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
final int code = mUriMatcher.match(uri);
if(code==SUCCESS){
ProductDBOpenHelper helper=new ProductDBOpenHelper(getContext());
final SQLiteDatabase db = helper.getWritableDatabase();
db.update("proinfo",values,selection,selectionArgs);
getContext().getContentResolver().notifyChange(uri,null);
}else{

throw new UnsupportedOperationException("Not yet implemented");
}
return 0;
}

}

代码工具封装  这里封装的是关于购物的，并不广泛适用package com.jms.rbclient.db.ContentProvider;import android.content.ContentResolver;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.net.Uri;/*** Created by liying on 2016/12/27.*/public class DBOUtils {private Context mContext;/*** 在构造方法里面初始化helper对象.** @param context*/public DBOUtils(Context context) {mContext = context;}/*** String userid; // 用户id* String productid; // 产品id* int prodNum; // 数量* int proPropertyidcolor; // 属性颜色id* int proPropertyidsize; // 属性尺寸id*/public void insert(String userid,String productid,int prodNum,int proPropertyidcolor,int proPropertyidsize) {final ContentResolver resolver = mContext.getContentResolver();Uri uri = Uri.parse("content://com.itheima.rbclient/proinfo");ContentValues values = new ContentValues();String userid1=userid; // 用户idString productid1=productid; // 产品idString prodNum1=prodNum+""; // 数量String proPropertyidcolor1=proPropertyidcolor+""; // 属性颜色idString proPropertyidsize1=proPropertyidsize+""; // 属性尺寸idvalues.put("userid",userid1);values.put("productid",productid1);values.put("prodNum",prodNum1);values.put("proPropertycolorid",proPropertyidcolor1);values.put("proPropertysizeid",proPropertyidsize1);resolver.insert(uri, values);}/*** userid 用户id* productid 产品id* prodNum 数量id* proPropertyid 属性id**//*** 删除数据 具备 产品id 数量id 属性id*/public void deleteSingle(String userid,String productid,int proPropertyidcolor,int proPropertyidsize){final ContentResolver resolver = mContext.getContentResolver();Uri uri=Uri.parse("content://com.jms.rbclient/proinfo");String userid1=userid; // 用户idString productid1=productid; // 产品idString proPropertyidcolor1=proPropertyidcolor+""; // 属性颜色idString proPropertyidsize1=proPropertyidsize+""; // 属性尺寸idString where="userid=?,productid=?,proPropertyidcolor=?,proPropertyidsize=?";String[] selectionArgs=new String[]{userid1,productid1,proPropertyidcolor1,proPropertyidsize1};resolver.delete(uri,where,selectionArgs);}/*** 清空数据 具备 产品id 数量id 属性id*/public void deleteAll(String userid){final ContentResolver resolver = mContext.getContentResolver();Uri uri=Uri.parse("content://com.jms.rbclient/proinfo");String userid1=user4000id; // 用户idString where="userid=?";String[] selectionArgs=new String[]{userid1};resolver.delete(uri,where,selectionArgs);}/**更新数据*/public void update(String userid,String productid,int proPropertyidcolor,int proPropertyidsize,int newnum,int newcolor,int newsize) {final ContentResolver resolver = mContext.getContentResolver();Uri uri = Uri.parse("content://com.jms.rbclient/proinfo");ContentValues values = new ContentValues();String newnum1=newnum+""; // 用户idString newcolor1=newcolor+""; // 属性颜色idString newsize1=newsize+""; // 属性尺寸id/*--------------- add begin ---------------*/String userid1=userid; // 用户idString productid1=productid; // 产品idString proPropertyidcolor1=proPropertyidcolor+""; // 属性颜色idString proPropertyidsize1=proPropertyidsize+""; // 属性尺寸id/*--------------- add begin ---------------*/values.put("prodNum",newnum1);values.put("proPropertycolorid",newcolor1);values.put("proPropertysizeid",newsize1);/*--------------- add begin ---------------*/String where="userid=?,productid=?,proPropertyidcolor=?,proPropertyidsize=?";String[] selectionArgs=new String[]{userid1,productid1,proPropertyidcolor1,proPropertyidsize1};resolver.update(uri, values,where,selectionArgs);}public Cursor query(String userid, String productid, int proPropertyidcolor, int proPropertyidsize){final ContentResolver resolver = mContext.getContentResolver();Uri uri=Uri.parse("content://com.jms.rbclient/proinfo");String userid1=userid; // 用户idString productid1=productid; // 产品idString proPropertyidcolor1=proPropertyidcolor+""; // 属性颜色idString proPropertyidsize1=proPropertyidsize+""; // 属性尺寸idString selection="userid=?,productid=?,proPropertyidcolor=?,proPropertyidsize=?";String[] selectionArgs=new String[]{userid1,productid1,proPropertyidcolor1,proPropertyidsize1};return resolver.query(uri,null,selection,selectionArgs,null);}public Cursor queryAll(String userid){final ContentResolver resolver = mContext.getContentResolver();Uri uri=Uri.parse("content://com.jms.rbclient/proinfo");String userid1=userid; // 用户idString selection="userid=?";String[] selectionArgs=new String[]{userid1};return resolver.query(uri,null,selection,selectionArgs,null);}}fragment 内容观察者监听回调mActivity.getContentResolver().registerContentObserver(uri, true, new ContentObserver(new Handler()) {@Overridepublic void onChange(boolean selfChange) {Toast.makeText(getContext(),"数据有变化",Toast.LENGTH_SHORT).show();refreshUI();super.onChange(selfChange);}});

以上为之前项目中Android本地数据库的相关代码，同行攻城狮们有建议，请不吝赐教哦！