十年磨一剑笔记android基础day10内容提供者

报名资源总连接 (了解)为什么需要内容提供(掌握)内容提供者工作原class extends重写方法}<provider1找到要的uri(掌握)自己实现一个内容提供者的增删改 表 Student A：应用要对B应用里面的数据库 表和student执行crud的操作B应用使用ContentResolver来进行操如果有的人测试使用的是 4.4版本注意publicclassMyContentProviderextendsContentProviderprivateOpenHelperhelper;//数据库的帮助类privatefinalstaticStringauthority= privatefinalstatic S=privatefinalstaticint_ID=10;privatefinalstaticintSTUDENTS=2;privatestaticUriMatchermatcher=newUriMatcher(UriMatcher.NO_MATCH);//authority path组成了 code该uri的唯一标matcher.addURI(authority," ",S);//content://authority/matcher.addURI(authority," /#",_ID);//表里面指定id的记录}publicbooleanonCreate()helper=MyOpenHelper.getInstance(getContext());returnfalse;}publicCursorquery(Uriuri,String[]projection,Stringselection,String[]selectionArgs,StringsortOrder){Databasedb=helper.getReadableDatabase();Cursorret=null;intcode=matcher.match(uri);switch(code){caseret=db.query("",projection,selection,selectionArgs,null,null,sortOrder);caseret=db.query("student",projection,selection,selectionArgs,null,null,sortOrder);thrownewIllegalArgumentException("没有这样的}return}publicUriinsert(Uriuri,ContentValuesvalues){Databasedb=helper.getWritableDatabase();intcode=matcher.match(uri);switch(code){caseS:db.insert("",null,caseSTUDENTS:db.insert("student",null,values);thrownewIllegalArgumentException("没有这样的}return}publicintdelete(Uriuri,Stringselection,String[]selectionArgs){Databasedb=helper.getWritableDatabase();intcode=switch(code){caseS:db.delete("",selection,casedb.delete("student",selection,selectionArgs);thrownewIllegalArgumentException("没有这样的}return}publicintupdate(Uriuri,ContentValuesvalues,Stringselection,String[]selectionArgs){Databasedb=helper.getWritableDatabase();intcode=matcher.match(uri);switch(code){caseS:db.update("",values,selection,casedb.update("student",values,selection,selectionArgs);thrownewIllegalArgumentException("没有这样的}return} //vnd.android.cursor.dir/publicStringgetType(Uriuri){Stringtype=null;intcode=matcher.match(uri);switch(code){casetype="vnd.android.cursor.item/";casetype="vnd.android.cursor.dir/";casetype="vnd.android.cursor.dir/student";}return}}内容提供者常用的apiUricontent://authortyDatabaseOpenHelperContentValues 获取10 (掌握)利用内容提供者联系没有数据库数据是从其他的应用程序里面内容提供者的数据：联系人的表联系人的唯一标示_id:数据表的是联系的数号码 邮箱。。raw_contact_id:iddata2:一定要确一定要确 的操作 datapublicvoidget(ViewList<Info>infos=newArrayList< com.android.contactsContentResolvercr=Uriuri=Uri.parse(" Cursorcursor=cr.query(uri,newString[]{"_id"},null,null,null);int_id=Infoinfo=newInfo();info._id=_id;//datadatauri=Uri.parse(" Cursorcursor2=cr.query(uri,newString[]{"data1","mimetype"},null,null,null);/*String[]names=cursor2.getColumnNames();for(Stringstring:names){Stringdata1=cursor2.getString(0);Stringmimetype=cursor2.getString(1);info.phone=}elseif("vnd.android.cursor.item/name".equals(mimetype)){//=data1; =}}}for(Infoinfo:infos){}}(掌握)利用内容提供者插系publicvoidinsert(View//插系 //1先插入一条记录到raw_contacts //2data表里面插入数据还要带上 ContentResolvercr=getContentResolver();Uriuri=Uri.parse(" ContentValuesvalues=newContentValues();Uriinsert=cr.insert(uri,=uri= //插入values.put("raw_contact_idraw_contact_id);values.put("data1","亲几圈");values.put("mimetype","vnd.android.cursor.item/name");cr.insert(uri,values);values.put("raw_contact_id",raw_contact_id);values.put("data1"," values.put("mimetype","vnd.android.cursor.item/phone_v2");values.put("data2",1);values.put("raw_contact_id",raw_contact_id);values.put("data1","qi values.put("mimetype","vnd.android.cursor.item/_v2");values.put("data2",1);}内容提供者在开发中自己写不多。的是内容提供者 确定要的应看文件里面的provider节 ：1类23是否需看类：Ctrl+ 输入找到需要使用的Uri(一定要看该应用程序里面数据库的表(掌握)内容观察者的原L应用publicclassMainActivityextendsActivityprivatestaticfinalStringTAG="MainActivity";protectedvoidonCreate(BundlesavedInstanceState){ContentResolvercr=Uriuri=Uri.parse(" cr.query(uri,null,null,null,null);,"MyContentObserverobserver=newMyContentObserver(new//使用内容观察者uri数据的改 cr.registerContentObserver(uri,true,observer);}privateclassMyContentObserverextendspublicMyContentObserver(Handlerhandler){}//uri数据的改变发出改变通知publicvoidonChange(booleanselfChangeLog.i(TAG,"数据已经发生改变");}}}(掌握)利用内容观察者用户数据1数据在哪里：数据的2该数据库里面的数据是通过内容提供者对外3的内容提供者已经发出改变通4使用内容观察者来检测的变publicclassMainActivityextendsActivitypublicstaticfinalStringTAG="MainActivity";privateContentResolvercr;privateMyContentObserverprotectedvoidonCreate(BundlesavedInstanceState){//检测的变cr=Uriuri=observer=newMyContentObserver(newHandler());cr.registerContentObserver(uri,true,observer);}privateclassMyContentObserverextendspublicMyContentObserver(Handlerhandler){}publicvoidonChange(booleanselfChange){//查询出插入的那条ContentResolvercrgetContentResolver();Uriuri=Uri.parse("content://sms");Cursorcursorcr.query(urinewString[]{"body"},nullnull"_iddesc");Stringbody=cursor.getString(0);Log.i(TAG,"body:"+body);}}protectedvoidonDestroy(){}}(掌握4.0一下 publicclassMainActivityextendsActivityprivateMyAdapterprotectedvoidonCreate(BundlesavedInstanceState){ListViewlv=(ListView)List<CallInfo>infos=CallInfoService.getCallInfos(this);adapter=newMyAdapter(infos);publicbooleanonItemLongClick(AdapterView<?>parent,Viewview,intposition,longid){CallInfoinfo=(CallInfo)adapter.getItem(position);finalStringnumber=infonumber;String[]items=newString[]{"号码到拨号盘","拨号","newpublicvoidonClick(DialogInterfacedialog,intwhich){switch(which){case//号码到拨号case1://拨号权case2:}}returnfalse;}}privateclassMyAdapterextendsprivateList<CallInfo>infos;privateLayoutInflatermInflater;publicMyAdapter(List<CallInfo>infos){s=mInflater=(LayoutInflater)}publicintgetCount(){returninfos.size();}publicObjectgetItem(intposition)//TODOAuto-generatedmethodstubreturninfos.get(position);}publiclonggetItemId(intposi