android动态生成界面、添加组件

桃扇骨 2022-08-06 12:08 212阅读 0赞

效果图：

![Image 1][]

layout界面布局：

<?xml version="1.0" encoding="utf-8"?>
    <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 {
    	/**
    	 * 获取到流，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);
    			// 设置是否向httpUrlConnection输出，post请求，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);
    			// 设置是否向httpUrlConnection输出，post请求，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，该语句隐含的执行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);//"\n";
                }
               //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，你要请求的地址";
    
    	@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());
    				//添加左边的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);
    				//添加左边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);
    				
    				//添加右边的layout，分为上下2部分，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);
    				//添加左右边
    				leftlayout.addView(rightlayout);
    				mainLayout.addView(leftlayout);
    			}
    		}catch(JSONException e){
    			e.printStackTrace();
    		}
    		
    	}
    }

下面是需要解析的json数据：

[Image 1]: