activity元素的哪個屬性用于指定活動類名？

activity的啟動可以通過AndroidManifest.xml文件中l(wèi)tactivitygt元素的屬性來指定activity類名。總共有四種模式:

l activity android: name # 34 activity main # 34 android: launch mode # 34 singletask # 34 gtlt/activity gt

1個標(biāo)準(zhǔn)

2單頂

3單任務(wù)

4單實(shí)例

這四種模式分為兩類，standard和signleTop屬于一類，singleTask和signleInstanc

在android開發(fā)中，怎樣動態(tài)生成多界面？

效果:布局界面布局:[html]查看plaincopyprintxml版encoding utf-8 lin:ad _ width match _ par: layout _ height match _ parentadecho 6-@ 。comorientationvertical lin: layout _ width match _ par: layout _ h:/titl:ori: layout _ width wrap _ cont: layout _ height wrap _ contentadecho -@ 。com/back _ 44 _ 44/lin: layout _ width match _ par: layout _ h: gravity c: layout _ width wrap _ cont: layout _ height wrap _ cont:t: textsize 20 sp//linearlayoutscrollvi: id @ id/scrollvi: layout _ width fill _ par: layout _ height wrap _ cont: scroll bars vertical linearlayoutadecho 25-@ c Omid @ id/mainlayoutadecho 26-@

[java]查看plaincopyprintpackage進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；導(dǎo)入Android . util . log；公共類HttpUtil {/***獲取流并自行處理數(shù)據(jù)* @ param path * @ return */公共靜態(tài)輸入流獲取輸入流(stringpath) {httpurl連接connnull嘗試{URL url新URL(路徑)；conn(HttpURLConnection)()；(真)；//設(shè)置是否將post請求輸出到httpUrlConnection，參數(shù)要放在http體中(true)；(3000);(3000);(假的)；(崗位)；if (() 200) {Log.d(mylog，getResponseCod: 200)；return()；} } catch(io exception e){()；}最后{if (conn！空){連接斷開CT()；} }返回null}/* * *直接返回響應(yīng)正文text * @ param path * @ return */public static string getresponse body(string path，string params){ http connection conn null；StringBuffer結(jié)果新建StringBuffer()

；嘗試{URL url新URL(路徑)；conn(HttpURLConnection)()；(真)；//設(shè)置是否將post請求輸出到httpUrlConnection，參數(shù)要放在http體中(true)；(3000);(3000);(假的)；(崗位)；//數(shù)據(jù)輸出流，如果(params！null){ data output stream out new data output stream(())；//將參數(shù)寫入流中，刷新提交關(guān)閉流out . Write bytes(params)；out . flush()；();}//讀取連接返回的數(shù)據(jù):Buffered Reader Reader New Buffered Reader(新輸入StreamReader(()))；字符串inputLine為空；while (((inputLine())！null)){(input line)；//

；}//Close()；if (() 200) {Log.d(mylog，getResponseCod: 200)；} } catch(io exception e){()；}最后{if (conn！null){ conn . disconnect()；}}r:[Java]查看plaincopyprintpackage導(dǎo)入org . JSON . JSON array；導(dǎo)入org . JSON . JSON exception；導(dǎo)入org . JSON . JSON object；進(jìn)口；進(jìn)口；進(jìn)口；導(dǎo)入Android . OS . bundle；導(dǎo)入android.util.Log；導(dǎo)入Android . util . typed value；進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；進(jìn)口；導(dǎo)入Android . widget . textview；公共課作業(yè)4擴(kuò)展活動{字符串路徑此處省略，你要請求的地址；@ override protected void onCreate(Bundle savedInstanceState){ super . onCreate(savedInstanceState)；setCont:結(jié)果)；try { JSON object obj new JSON object(result)；JSONArray數(shù)組(online courses)；for(int I 0；I array . length()；i ) {JSONObject課程(一)；// Log.d(mylog，cours:())；//在左側(cè)添加LayoutLinearLayout left layout new linear layout(this)；//注意包裝。其他包下的LayoutParams。;不工作。LayoutParams新的LayoutParams (_ parent，_ content)；；(params)；(LinearLayout。橫向)；(_垂直)；//添加圖片imageview imageview左邊布局的新imageview(this)；paramsnew LayoutParams(_CONTENT，_ CONTENT)；(params)；(_ default _ 195 _ 0)；(imageView)；//添加右邊的布局，分為兩部分，上面是標(biāo)題，下面是進(jìn)度條線性布局right layout new linear layout(this)；拉友tParams rightlayoutparams new layout params(_ PARENT，_ CONTENT)；(rightLayoutParams)；();//添加課程標(biāo)題TextView TextView New TextView(this)；paramsnew LayoutParams(_CONTENT，_ CONTENT)；(params)；((courseName)。toString())；(_UNIT_SP，15)；//18SP//學(xué)分，橫向布局，分左右，左:學(xué)分，右:分?jǐn)?shù)線性布局studylayoutnew線性布局(this)；paramsnew LayoutParams(_PARENT，_ CONTENT)；(params)；(LinearLayout。橫向)；//添加學(xué)分TextView study view TextView(this)；paramsnew LayoutParams(_CONTENT，_ CONT:)；(_UNIT_SP，)；((# b6b6b 6))；//方法二:settext color (color.rgb (255，255，255))；//添加信用值textview studyvalueview new textview(this)；paramsnew LayoutParams(_CONTENT，_ CONTENT)；(params)；((courseCredit)。toString())；(_UNIT_SP，14)；//進(jìn)度條，橫向布局，分左中右，左:學(xué)習(xí)進(jìn)度，中:進(jìn)度條，右:%線性布局處理layoutnew線性布局(this)；paramsnew LayoutParams(_PARENT，_ CONTENT)；(params)；(LinearLayout。橫向)；//添加學(xué)習(xí)進(jìn)度TextView process TextView New TextView(this)；paramsnew LayoutParams(_CONTENT，_ CONT:)；(_UNIT_S第頁)；((# b6b6b 6))；//添加進(jìn)度條barnew進(jìn)度條(this，null，)；//指定進(jìn)度條樣式params新布局params (150，_ content)；(params)；(100);(10);//添加% textviewprocessvaluetextview new textview(this)；paramsnew LayoutParams(_CONTENT，_ CONTENT)；(params)；(10%);(_UNIT_SP，)；((# b6b6b 6))；//添加標(biāo)題(textView)；//添加學(xué)分(study view)；(studyValueView)；(study布局)；//添加一個進(jìn)度條(process textview)；(巴)；(processvaluetextView)；(process layout)；//添加rightlayout(left layout)；} } catch(JSON exception e){()；