某500强android学习资料-第六章-Android进程间通信

第六章Android进程间通信der便，制，对于库和框架层的开发人员来说也会更多的用到底层的机制，这些内容会放在另一篇d6.1BroadcastReceiver在android中，通过广播(broadcast)可以通知其他广播接受者某个事件发生了。比如电源publicclassBroadcastTestextendsActivity{publicstaticfinalStringNEW_LIFEFROM_DETECTED=“com.android.broadcasttest.NEW_LIFEFROM”;publicvoidonCreate(BundlesavedInstanceState){ButtonbtnButtonfindViewByIdRid.btn0);btn0.setOnClickListener(newOnClickListener(){publicvoidonClick(Viewv){ewIntentNEWLIFEFROMDETECTED}}…}PublicclassMyBroadcastReceiverextendsBroadcastReceiver{voidonReceiveContextcontextInteneintent}}eceiverandroidnameMyBroadcastReceiverntfilter<actionandroid:name=”com.android.broadcasttest.NEW_LIFEFROM”/>entfiltereroadcastBroadcastReceiver->通知Broadcast->启动相关处理应用。比如，监听来电、邮件、短信之类的，都隶oadcastReceivermReceivernewBroadcastReceivercvoidonReceiveContextcontextIntentintent}}ilternewIntentFiltermfilteraddActionIntentACTION_SCREEN_OFF);ivermReceivermfiltersterReceivermReceiverctivityManagerServicejavapandroidappdocsappspotcomreferenceandroidcontentIntenthtmlBroadcastr6.2IntentIntent是一种运行时绑定(run-timebinding)机制，它能在程序运行过程中连接两个不同的要激活一个新的Activity，或者让一个现有的Activity做新的操作，可以通过调用Context.startService()方法或者调用Context.bindService()方法将调用此方法的上下文对三个方法可以发送BroadcastIntent。发送之后，所有已注册的并且拥有与之相匹配Intent一旦发出，Android都会准确找到相匹配的一个或多个Activity，Service或者tntCTIONCALL启动一个电话.CTIONEDIT显示用户编辑的数据.ACTIONMAINIONSYNCHEADSETPLUG警告ACTIONSCREEN_ON屏幕变亮警告.ONTIMEZONECHANGED改变时区警告.UriuriUriparse"");newIntentIntentACTIONVIEWurity该activity可以被包含在另外一个装载小工具的activity中程序启动器中Type：显式指定Intent的数据类型(MIME)(多用途互联网邮件扩展，Multipurposenttypecontent://com.example.transportationprovider/trains/122(一条列车信息的uri)的多个记录的格式：vnd.android.cursor.dir/vnd.yourcompanyname.contenttype，如：contentcomexampletransportationprovidertrains(所有列车信息)的MIME类itnewIntentActivityMainthisActivityclassBundleputExtras)和getExtras()作为Bundle来读和写。例如：itnewIntentActivityMainthisActivityclassndlebundlenewBundlebundleputStringname,"ThisisfromMainActivity!");ndleBundlebundlegetIntentgetExtrasebundlegetStringnamesetClassContextClass件。是那些间接Intent，通过解析将Intent映射给可以处理此Intent的Activity、Service或estxmlintentfilterIntentcategory现在组建的类别列表中。标组件必须至少包含这两个类别。httpwwwcnblogscomphinecosarchive09/08/26/1554684.htmlfestxml<manifestxmlns:android="/apk/res/android"package="com.example.android.notepad">applicationandroidicondrawableappnotesoidlabelstringappnameoviderandroidnameNotePadProviderandroid:authorities="vider.NotePad"activityandroidnameNotesListandroidlabel"@string/title_notes_list">ntfilter<actionandroid:name="ent.action.MAIN"/><categoryandroid:name="ent.category.LAUNCHER"/>entfilterntfilter<actionandroid:name="ent.action.VIEW"/><actionandroid:name="ent.action.EDIT"/><actionandroid:name="ent.action.PICK"/><categoryandroid:name="ent.category.DEFAULT"/><dataandroid:mimeType="vnd.android.cursor.dir/vnd.google.note"/>entfilterntfilter<actionandroid:name="ent.action.GET_CONTENT"/><categoryandroid:name="ent.category.DEFAULT"/><dataandroid:mimeType="vnd.android.cursor.item/vnd.google.note"/>entfilterty选择(android.app.action.PICK)。erivityandroidnameNoteEditordroidthemeandroidstyleThemeLightbelstringtitlenotenOrientationsensor>intentfilterandroidlabelstringresolve_edit"><actionandroid:name="ent.action.VIEW"/><actionandroid:name="ent.action.EDIT"/><actionandroid:name="com.android.notepad.action.EDIT_NOTE"/><categoryandroid:name="ent.category.DEFAULT"/><dataandroid:mimeType="vnd.android.cursor.item/vnd.google.note"/>entfilternotes.-->ntfilter<actionandroid:name="ent.action.INSERT"/><categoryandroid:name="ent.category.DEFAULT"/><dataandroid:mimeType="vnd.android.cursor.dir/vnd.google.note"/>entfilterty第一个filter查看、编辑便笺第二个filter新建便笺IVENamectionmponentNameIntentIntentintMenuItemivityandroidnameTitleEditorndroidlabelstringtitleedittitledroidthemeandroidstyleThemeDialogwindowSoftInputModestateVisibleintentfilterandroidlabel@string/resolve_title"><actionandroid:name="com.android.notepad.action.EDIT_TITLE"/><categoryandroid:name="ent.category.DEFAULT"/><categoryandroid:name="ent.category.ALTERNATIVE"/><dataandroid:mimeType="vnd.android.cursor.item/vnd.google.note"/>entfiltertyintentfilterandroidlabel="@string/resolve_title"指定)，yomgoogleandroidnotepadactionEDITTITLEtacontentcomgoogleproviderNotePadnotesIDandroidcomreferenceandroidcontentintenthtml6.3ContentProviderider一组用于提供其他应用程序存取数据的标准方法的类。er查询数据修改数据添加数据删除数据 “content://”代表数据的路径一个可选的标识数据的IDentcontactspeopleURIcontent://contacts/people/45这个URI返回单个结果(ID为45的联系人记录)Android提供了一系列的帮助类(在vider包下)，里面包含了很多以类变量形式MediaStoreImagesMediaINTERNAL_CONTENT_URIeopleCONTENTURIUriperson=ContentUriswithAppendedId(PeopleCONTENTURI询:CursorcurmanagedQuerypersonnullnullnull);publicclassContentProviderDemoextendsActivity{publicvoidonCreate(BundlesavedInstanceState){vedInstanceStateRlayoutmainecords}privatevoiddisplayRecords(){Stringcolumns[]=newString[]{People.NAME,People.NUMBER};rimContactsPeopleCONTENTURIurmanagedQueryContactsif(cur.moveToFirst()){nulleNonulldo{namecurgetStringcurgetColumnIndexPeopleNAMEphoneNocurgetStringcur.getColumnIndex(People.NUMBER));extthisnamephoneNo,THLONG}}}更改第10条记录的name字段值为“XYZ”privatevoidupdateRecord(intrecNo,Stringname){UriuriContentUriswithAppendedIdPeople.CONTENT_URI,recNo);entValuesvaluesnewContentValuesvaluesputPeopleNAMEname);getContentResolverupdateurivaluesnullnull;}privatevoidinsertRecords(Stringname,StringphoneNo){entValuesvaluesnewContentValuesvaluesputPeopleNAMEname);UriurigetContentResolverinsertPeople.CONTENT_URI,values);Log.d(”ANDROID”,uri.toString());YvaluesclearvaluesputContactsPhonesTYPEPeoplePhones.TYPE_MOBILE);valuesputPeopleNUMBERphoneNo;ontentResolverinsertnumberUrivalues}这样我们就可以调用insertRecords(name,phoneNo)的方式来向联系人信息簿中添加联系人号码。privatevoiddeleteRecords(){riuriPeopleCONTENTURIetContentResolverdeleteurinullnull}getContentResolver()deleteuriNAMEXYZ‟”,null);好是类的全名称，如ticfinalUriCONTENTURIUriparsecontentcommycomMyContentProvider实rCursor方法如insert(),update()以及gerpublicclassMyUsers{publicstaticfinalStringAUTHORITY“com.wissen.MyContentProvider”;publicstaticfinalclassUserimplementsBaseColumns{publicstaticfinalUriCONTENT_URI=UriparsecontentcomwissenMyContentProvider);publicstaticfinalStringUSERNAME=“USER_NAME”;}}publicclassMyContentProviderextendsContentProvider{privateSQLiteDatabasesqlDB;rivateDatabaseHelperdbHelperprivatestaticfinalStringDATABASE_NAME=“Users.db”;privatestaticfinalintDATABASE_VERSION=1;privatestaticfinalStringTABLE_NAME=“User”;privatestaticfinalStringTAG=“MyContentProvider”;privatestaticfinalStringDATABASE_CREATE=eatetableTABLENAMEerprimarykeyautoincrementUSERNAMEtexterprivatestaticclassDatabaseHelperextendsSQLiteOpenHelper{DatabaseHelper(Contextcontext){extDATABASENAMEnullDATABASEVERSION}edbSECREATE}{dbexecSQLDROPTABLEIFEXISTSTABLENAME;}}publicbooleanonCreate(){elpernewDatabaseHelpergetContextreturndbHelpernullfalsetrue}publicUriinsert(Uriuri,ContentValuescontentvalues){rgetWritableDatabasengrowIdsqlDBinsertTABLENAMEcontentvaluesif(rowId>0){UrirowUri=tentUrisappendIdMyUsersUserCONTENTURIbuildUpongetContextgetContentResolvernotifyChangerowUrinull}thrownewSQLExceptionFailedtoinsertrowintouri);}selectionArgs,StringsortOrder){ryBuilderqbnewSQLiteQueryBuilderabasedbdbHelpergetReadableDatabaseblesTABLENAMECursorcqbquerydbprojectionselection,ullnullnullsortOrderNotificationUrigetContextgetContentRes