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android动态生成界面、添加组件

来源：程序员人生发布时间：2015-02-27 08:30:23 阅读次数：2981次

效果图：

layout界面布局：

<?xml version="1.0" encoding="utf⑻"?> <LinearLayout xmlns:ad="http://schemas.android.com/apk/res/android" ad:layout_width="match_parent" ad:layout_height="match_parent" ad:orientation="vertical" > <LinearLayout ad:layout_width="match_parent" ad:layout_height="30dp" ad:background="@drawable/titlebar_bg" ad:orientation="horizontal" > <ImageView ad:layout_width="wrap_content" ad:layout_height="wrap_content" ad:src="@drawable/back_44_44" /> <LinearLayout ad:layout_width="match_parent" ad:layout_height="30dp" ad:gravity="center" > <TextView ad:layout_width="wrap_content" ad:layout_height="wrap_content" ad:text="课程列表" ad:textSize="20sp" /> </LinearLayout> </LinearLayout> <ScrollView ad:id="@+id/ScrollView" ad:layout_width="fill_parent" ad:layout_height="wrap_content" ad:scrollbars="vertical" > <LinearLayout ad:id="@+id/mainLayout" ad:layout_width="match_parent" ad:layout_height="wrap_content" ad:orientation="vertical" > </LinearLayout> </ScrollView> </LinearLayout>

httputil辅助类：

package com.tudou.activity.work4; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import android.util.Log; public class HttpUtil { /** * 获得到流，自己处理数据 * @param path * @return */ public static InputStream getInputStream(String path) { HttpURLConnection conn = null; try { URL url = new URL(path); conn = (HttpURLConnection) url.openConnection(); conn.setDoInput(true); // 设置是不是向httpUrlConnection输出，post要求，参数要放在http正文内 conn.setDoOutput(true); conn.setReadTimeout(3000); conn.setConnectTimeout(3000); conn.setUseCaches(false); conn.setRequestMethod("POST"); if (conn.getResponseCode() == 200) { Log.d("mylog", "getResponseCode:" + 200); return conn.getInputStream(); } } catch (IOException e) { e.printStackTrace(); } finally { if (conn != null) { conn.disconnect(); } } return null; } /** * 直接返回响应体正文 * @param path * @return */ public static String getResponseBody(String path,String params) { HttpURLConnection conn = null; StringBuffer result=new StringBuffer(); try { URL url = new URL(path); conn = (HttpURLConnection) url.openConnection(); conn.setDoInput(true); // 设置是不是向httpUrlConnection输出，post要求，参数要放在http正文内 conn.setDoOutput(true); conn.setReadTimeout(3000); conn.setConnectTimeout(3000); conn.setUseCaches(false); conn.setRequestMethod("POST"); //数据输出流，该语句隐含的履行connect动作 if(params!=null){ DataOutputStream out = new DataOutputStream( conn.getOutputStream()); //将参数写入流，刷新提交关闭流 out.writeBytes(params); out.flush(); out.close(); } //读取连接返回的数据 BufferedReader reader = new BufferedReader(new InputStreamReader( conn.getInputStream())); String inputLine = null; while (((inputLine = reader.readLine()) != null)) { result.append(inputLine);//" "; } //关闭 reader.close(); if (conn.getResponseCode() == 200) { Log.d("mylog", "getResponseCode:" + 200); } } catch (IOException e) { e.printStackTrace(); } finally { if (conn != null) { conn.disconnect(); } } return result.toString(); } }

主activity:

package com.tudou.activity.work4; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import com.tudou.activity.R; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.LinearLayout.LayoutParams; import android.widget.ProgressBar; import android.widget.TextView; public class HomeWork4 extends Activity { String path = "此处省略，你要要求的地址"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.homework4); LinearLayout mainLayout = (LinearLayout)findViewById(R.id.mainLayout); String result=HttpUtil.getResponseBody(path,null); // Log.d("mylog", "result:" + result); try{ JSONObject obj = new JSONObject(result); JSONArray array=obj.getJSONArray("onlineCourses"); for (int i = 0; i < array.length(); i++) { JSONObject course= array.getJSONObject(i); // Log.d("mylog", "course:" + course.toString()); //添加左侧的layout LinearLayout leftlayout=new LinearLayout(this); //注意包android.widget.LinearLayout.LayoutParams，其它包下面的LayoutParams不起作用 LayoutParams params=new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); params.topMargin=10; leftlayout.setLayoutParams(params); leftlayout.setOrientation(LinearLayout.HORIZONTAL); leftlayout.setGravity(Gravity.CENTER_VERTICAL); //添加左侧layout的图片 ImageView imageView=new ImageView(this); params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); imageView.setLayoutParams(params); imageView.setImageResource(R.drawable.image_default_195_130); leftlayout.addView(imageView); //添加右侧的layout，分为上下2部份，上面是标题，下面是进度条 LinearLayout rightlayout=new LinearLayout(this); LayoutParams rightLayoutParams=new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); rightlayout.setLayoutParams(rightLayoutParams); rightlayout.setOrientation(LinearLayout.VERTICAL); //添加课程标题 TextView textView=new TextView(this); params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); textView.setLayoutParams(params); textView.setText(course.get("courseName").toString()); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 15);//18SP //学分，水平布局,分为左右，左：学分，，右：分值 LinearLayout studyLayout=new LinearLayout(this); params=new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); studyLayout.setLayoutParams(params); studyLayout.setOrientation(LinearLayout.HORIZONTAL); //添加学分 TextView studyView=new TextView(this); params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); studyView.setLayoutParams(params); studyView.setText("学分:"); studyView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12); studyView.setTextColor(Color.parseColor("#b6b6b6"));//第2种方法：setTextColor(Color.rgb(255, 255, 255)); //添加学分值 TextView studyValueView=new TextView(this); params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); studyValueView.setLayoutParams(params); studyValueView.setText(course.get("courseCredit").toString()); studyValueView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14); //进度条，水平布局,分为左中右，左：学习进度，中：进度条，右：%值 LinearLayout processLayout=new LinearLayout(this); params=new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); processLayout.setLayoutParams(params); processLayout.setOrientation(LinearLayout.HORIZONTAL); //添加学习进度 TextView processtextView=new TextView(this); params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); processtextView.setLayoutParams(params); processtextView.setText("学习进度:"); processtextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12); processtextView.setTextColor(Color.parseColor("#b6b6b6")); //添加进度条 ProgressBar bar=new ProgressBar(this,null,android.R.attr.progressBarStyleHorizontal);//指定进度条样式 params=new LayoutParams(150, ViewGroup.LayoutParams.WRAP_CONTENT); bar.setLayoutParams(params); bar.setMax(100); bar.setProgress(10); //添加%值 TextView processvaluetextView=new TextView(this); params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); processvaluetextView.setLayoutParams(params); processvaluetextView.setText("10%"); processvaluetextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12); processvaluetextView.setTextColor(Color.parseColor("#b6b6b6")); //添加标题 rightlayout.addView(textView); //添加学分 studyLayout.addView(studyView); studyLayout.addView(studyValueView); rightlayout.addView(studyLayout); //添加进度条 processLayout.addView(processtextView); processLayout.addView(bar); processLayout.addView(processvaluetextView); rightlayout.addView(processLayout); //添加左右侧 leftlayout.addView(rightlayout); mainLayout.addView(leftlayout); } }catch(JSONException e){ e.printStackTrace(); } } }

下面是需要解析的json数据：

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