本程序中读取另一个程序中数据

1、在本程序中读取另一个程序中数据一、 首先创建一个保存数据的程序Con te ntWriter,创建一个新的类MyP rovider.class,并继承Content Provider。主要代码如下：（创建好以后对清单文件做一定配置，具体配置可见下图：）Q APT File Edit Refactor Source Navigate Search Project Run Window Help R n nJava - ContentWritcr/AndroidManifestxml - ADT - /User/acety/Ocsktop/androidcodcicQQuick AcsJ ID I

2、 盼脚 DDMS4 Packase Explorer S3 ContcMRcadcr $Comen(WUf jti comjikcxucyudn.conicnl writer d) MdinAcifvilvjdvd Myprovtder.java ICenerAtcd fiksl BhAndroid 4.rawa&lc-hdp) (4rdwablc*mdpi C-4rawa&1e-xhdpi eaYout总 activitymam.xml试 ffagmcnimainxnil边 Myprovtderjava Q ConientWriwr肉android: aIIowBackup= trueand

3、roid :icoyawable/ic.la”oc/)er” android: label sting/a pp-name” android:theme=(3style/4ppr/ieme* octivityandroid ：nane= com. jikexueyuan.contentwriter.MainActivityandroid:label= *(95tring/sppname 设定为trg说明可以被外部程序调用action android：name=ent.action.AM provider android；name=-MyJrovider* android:

4、exportedtrue Bndroid:authorities，co/B jih| /manifest3 Manifest ApplicationPermtonsInstrumentation 国 AndroidManiFest.xml先 Outline iS回 mirlifcstie utct-Jdk回 ppli4lion 0xtivity: comJlkexueyMn, manifest/afP*cition/prov4(fer/andnMd：cxiorm)377M or 625U Q Android SOK Content LMCer4package com . yaoqian . c

5、ontentwriterp ublicclassMyP roviderexte nds ContentPro viderimportan droid.content . ContentProvider ;importan droid.content . ContentValues ;imp ortan droid.content . Con text ;imp ortan droid.database . Cursor ;imp ortan droid.database . sqlite . SQLiteDatabaseimportan . Uri ;SQLiteDataba

6、se database ;）；publicstatic final Uri URI = Uri . parse (content:/com.yaoqian.cp/删除public int delete (Uri argO , Stringarg1 , String arg2) retur n0;/区分intent中的意图publicStringgetType ( Uri argO ) returnnull ;/插入publicUri insert (Uri arg0 , ContentValuesarg1 ) database .insert (tab , _id , arg1 );retur

7、nnull ;/p ublicboolea n on Create () database = getCo ntext (). open OrCreateDatabase (myc p.db3 , Con text . MODE _P RIVAT,E null );database . execSQL( create table tab(_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOTNULL);returntrue ;/查询public Cursor query (Uri argO , String arg1 , String arg2

8、 , String arg3 ,String arg4 ) Cursor cursor = database . query (tab , null , null , null , null , null , null );returncursor ;/更新p ublic intup date ( Uri argO , Conten tValuesarg1 , Stri ng arg2 , Stri ng arg3 ) return0；在MainActivity.class中写入数据，具体实现如下代码:Package com . yaoqian . contentwriterimportan

9、droid . os. Bun dle ;imp ortan droid . app. Activityimp ortan droid . content . Conten tValuesimportan droid . view . View;p ublicclass Mai nActivity exte nds Activity p rotectedvoid on Create ( Bun dle savedI nsta nceState ) sup er . on Create ( savedI nsta nceState );setContentView ( R layout . ac

10、tivity_main );fin dViewById ( R. id . butt on1 ). set On ClickListe ner(new View. On ClickListe ner() p ublicvoid on Click (View argO ) write (););public void write ()ContentValues values ;values = new ContentValues ();values . put (name , Java);getContentResolver(). insert(MyProvider.URI,values);va

11、lues = new ContentValues();values . put (name , Swift);getContentResolver(). insert(MyProvider.URI,values);values = new ContentValues();values . put (name , Python);getContentResolver(). insert(MyProvider.URI,values);values = new ContentValues();values .p ut (” name, C#);getContentResolver(). insert

12、(MyProvider.URI,values);四、代码，写在 MainActivity.class即可:以上程序在布局文件中只有一个按钮，提供点击监听事件，就不赘述接下来就是另外一个读取数据的程序ContentRead，改程序只需要实现获取数据就可以，主要实现方法如下Package com . yaoqian . contentreadrimportan . Uri ;importan droid.os. Bundle ;importan droid.app. Activity ;imp ortan droid.database . Cursor ;imp ortan droid.widget . Toast ;p ublicclass Mai nActivity exte nds Activity ）；Uri URI = Uri .parse (content:/com.yaoqian.cpp rotectedvoid on Create ( Bun dle savedI nsta nceState ) sup er . on Create(savedInstanceState);setC on te ntView(R layout . activity_main);Cursor cursor=getC onten tRe