css如何動態添加class 在android開發中，怎樣動態生成多界面？

在android開發中，怎樣動態生成多界面？效果：layout界面布局：[html] view plaincopyprintxml version1.0 encodingutf-8LinearLayo

在android開發中，怎樣動態生成多界面？

效果：layout界面布局：[html] view plaincopyprintxml version1.0 encodingutf-8LinearLayout xmlns:ad_widthmatch_parentad:layout_heightmatch_parentad:orientationvertical LinearLayoutad:layout_widthmatch_parentad:layout_height30dpad:/titlebar_bgad:orientationhorizontal ImageViewad:layout_widthwrap_contentad:layout_heightwrap_contentad:/back_44_44 /LinearLayoutad:layout_widthmatch_parentad:layout_height30dpad:gravitycenter TextViewad:layout_widthwrap_contentad:layout_heightwrap_contentad:text課程列表ad:textSize20sp //LinearLayout/LinearLayoutScrollViewad:id@ id/ScrollViewad:layout_widthfill_parentad:layout_heightwrap_contentad:scrollbarsvertical LinearLayoutad:id@ id/mainLayoutad:layout_widthmatch_parentad:layout_heightwrap_contentad:orientationvertical /LinearLayout/ScrollView/LinearLayouthttputil輔助類：

[java] view plaincopyprintpackage ;import ;import ;import ;import ;import ;import ;import ;import android.util.Log;public class HttpUtil {/*** 獲取到流，自己處理數據* @param path* @return*/public static InputStream getInputStream(String path) {HttpURLConnection conn null;try {URL url new URL(path);conn (HttpURLConnection) ();(true);// 設置是否向httpUrlConnection輸出，post請求，參數要放在http正文內(true);(3000);(3000);(false);(POST);if (() 200) {Log.d(mylog, getResponseCode: 200);return ();}} catch (IOException e) {();} finally {if (conn ! null) {conn.disconnect();}}return null;}/*** 直接返回響應體正文* @param path* @return*/public static String getResponseBody(String path,String params) {HttpURLConnection conn null;StringBuffer resultnew StringBuffer()

;try {URL url new URL(path);conn (HttpURLConnection) ();(true);// 設置是否向httpUrlConnection輸出，post請求，參數要放在http正文內(true);(3000);(3000);(false);(POST);//數據輸出流，該語句隱含的執行connect動作if(params!null){DataOutputStream out new DataOutputStream( ());//將參數寫入流，刷新提交關閉流out.writeBytes(params);out.flush();();}//讀取連接返回的數據BufferedReader reader new BufferedReader(new InputStreamReader( ()));String inputLine null;while (((inputLine ()) ! null)) {(inputLine);//

;}//關閉();if (() 200) {Log.d(mylog, getResponseCode: 200);}} catch (IOException e) {();} finally {if (conn ! null) {conn.disconnect();}}return ();}}主activity:[java] view plaincopyprintpackage ;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import ;import ;import ;import android.os.Bundle;import android.util.Log;import android.util.TypedValue;import ;import ;import ;import ;import ;import ;import android.widget.TextView;public class HomeWork4 extends Activity {String path 此處省略，你要請求的地址;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView();LinearLayout mainLayout (LinearLayout)findViewById();String result(path,null);// Log.d(mylog, result: result);try{JSONObject obj new JSONObject(result);JSONArray array(onlineCourses);for (int i 0; i array.length(); i ) {JSONObject course (i);// Log.d(mylog, course: ());//添加左邊的layoutLinearLayout leftlayoutnew LinearLayout(this);//注意包，其它包下面的LayoutParams不起作用LayoutParams paramsnew LayoutParams(_PARENT, _CONTENT);;(params);(LinearLayout.HORIZONTAL);(_VERTICAL);//添加左邊layout的圖片ImageView imageViewnew ImageView(this);paramsnew LayoutParams(_CONTENT, _CONTENT);(params);(_default_195_130);(imageView);//添加右邊的layout，分為上下2部分，上面是標題，下面是進度條LinearLayout rightlayoutnew LinearLayout(this);LayoutParams rightLayoutParamsnew LayoutParams(_PARENT, _CONTENT);(rightLayoutParams);();//添加課程標題TextView textViewnew TextView(this);paramsnew LayoutParams(_CONTENT, _CONTENT);(params);((courseName).toString());(_UNIT_SP, 15);//18SP//學分，水平布局,分為左右，左：學分，，右：分值LinearLayout studyLayoutnew LinearLayout(this);paramsnew LayoutParams(_PARENT, _CONTENT);(params);(LinearLayout.HORIZONTAL);//添加學分TextView studyViewnew TextView(this);paramsnew LayoutParams(_CONTENT, _CONTENT);(params);(學分:);(_UNIT_SP, 12);((#b6b6b6));//第2種方法：setTextColor(Color.rgb(255, 255, 255));//添加學分值TextView studyValueViewnew TextView(this);paramsnew LayoutParams(_CONTENT, _CONTENT);(params);((courseCredit).toString());(_UNIT_SP, 14);//進度條，水平布局,分為左中右，左：學習進度，中：進度條，右：%值LinearLayout processLayoutnew LinearLayout(this);paramsnew LayoutParams(_PARENT, _CONTENT);(params);(LinearLayout.HORIZONTAL);//添加學習進度TextView processtextViewnew TextView(this);paramsnew LayoutParams(_CONTENT, _CONTENT);(params);(學習進度:);(_UNIT_SP, 12);((#b6b6b6));//添加進度條ProgressBar barnew ProgressBar(this,null,);//指定進度條樣式paramsnew LayoutParams(150, _CONTENT);(params);(100);(10);//添加%值TextView processvaluetextViewnew TextView(this);paramsnew LayoutParams(_CONTENT, _CONTENT);(params);(10%);(_UNIT_SP, 12);((#b6b6b6));//添加標題(textView);//添加學分(studyView);(studyValueView);(studyLayout);//添加進度條(processtextView);(bar);(processvaluetextView);(processLayout);//添加左右邊(rightlayout);(leftlayout);}}catch(JSONException e){();　

dw中span class怎么添加？

在標簽上添加class屬性或者id屬性，比如啊，

或者

在css文件中 id選擇器(唯一不可重復使用) #red {樣式;} class類選擇器 .center {樣式;}