android上的i-jetty (2)用Servlet显示Android设备的app列表

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环境 : android + i-jetty + servlet

MyServlet.java   1 package com.synnex.servlet;
  2 
  3 import java.io.ByteArrayOutputStream;
  4 import java.io.IOException;
  5 import java.io.PrintWriter;
  6 import java.util.List;
  7 
  8 import javax.servlet.ServletConfig;
  9 import javax.servlet.ServletException;
 10 import javax.servlet.ServletOutputStream;
 11 import javax.servlet.http.HttpServlet;
 12 import javax.servlet.http.HttpServletRequest;
 13 import javax.servlet.http.HttpServletResponse;
 14 
 15 import android.content.Context;
 16 import android.content.Intent;
 17 import android.content.pm.ApplicationInfo;
 18 import android.content.pm.PackageInfo;
 19 import android.content.pm.PackageManager;
 20 import android.content.pm.PackageManager.NameNotFoundException;
 21 import android.content.pm.ResolveInfo;
 22 import android.graphics.Bitmap;
 23 import android.graphics.Canvas;
 24 import android.graphics.PixelFormat;
 25 import android.graphics.drawable.Drawable;
 26 import android.util.Log;
 27 
 28 public class MyServlet extends HttpServlet
 29 {
 30     private static final long serialVersionUID = -4258280559794945071L;
 31     private final String TAG = "MyServlet";
 32     private final String METHOD = "method";
 33     
 34     private Context context;
 35     
 36     public void init(ServletConfig config) throws ServletException
 37     {
 38         super.init(config);
 39         context = (Context)config.getServletContext().getAttribute("org.mortbay.ijetty.context");
 40         Log.v(TAG, "## init android context success ##");
 41     }
 42     
 43     protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
 44     {
 45         String method = request.getParameter(METHOD);
 46         if("listApp".equals(method))
 47         {
 48             response.setContentType("text/html; charset=UTF-8");
 49             listApp(request, response);
 50         }
 51         else if("appIcon".equals(method))
 52         {
 53             appIcon(request, response);
 54         }
 55         else
 56         {
 57             response.setContentType("text/html; charset=UTF-8");
 58             sayHello(request, response);
 59         }
 60     }
 61 
 62     private void appIcon(HttpServletRequest request, HttpServletResponse response) throws IOException
 63     {
 64         response.setContentType("image/JPEG");
 65         ServletOutputStream out = response.getOutputStream();
 66         PackageManager pm = context.getPackageManager();
 67         try
 68         {
 69             Drawable icon = pm.getApplicationIcon(request.getParameter("id"));
 70             ByteArrayOutputStream baos = new ByteArrayOutputStream();
 71             drawableToBitmap(icon).compress(Bitmap.CompressFormat.PNG, 100, baos);
 72             byte[] b = baos.toByteArray();
 73             out.write(b);
 74             out.flush();
 75         }
 76         catch (NameNotFoundException e)
 77         {
 78             Log.e(TAG, "get app icon error : ", e);
 79             out.write("error".getBytes("UTF-8"));
 80         }
 81         response.flushBuffer();
 82     }
 83 
 84     private void sayHello(HttpServletRequest request, HttpServletResponse response) throws IOException
 85     {
 86         PrintWriter writer = response.getWriter();
 87         writer.write("Hello World!!!");
 88         writer.flush();
 89         response.flushBuffer();
 90     }
 91 
 92     private void listApp(HttpServletRequest request, HttpServletResponse response) throws IOException
 93     {
 94         Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
 95         mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
 96         List<ResolveInfo> apps = context.getPackageManager().queryIntentActivities(mainIntent, 0);
 97         PackageManager pm = context.getPackageManager();
 98         
 99         StringBuilder buf = new StringBuilder(500);
100         buf.append("<table>")
101                 .append("<tr>")
102                     .append("<th>App Name</th>")
103                     .append("<th>App Version</th>")
104                     .append("<th>Package Name</th>")
105                     .append("<th>App Icon</th>")
106                 .append("</tr>");
107         String imgBaseUrl = request.getContextPath() + request.getServletPath() + "?" + METHOD + "=appIcon";
108         Log.v(TAG, imgBaseUrl);
109         for(ResolveInfo info : apps)
110         {
111             try
112             {
113                 PackageInfo appInfo = pm.getPackageInfo(info.activityInfo.packageName, 0);
114                 if((appInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) <= 0)
115                 {
116                     buf.append("<tr>")
117                         .append("<td>").append(appInfo.applicationInfo.loadLabel(pm)).append("</td>")
118                         .append("<td>").append(appInfo.versionName).append("</td>")
119                         .append("<td>").append(appInfo.packageName).append("</td>")
120                         .append("<td><img width='50px' height='50px' src='").append(imgBaseUrl).append("&id=").append(appInfo.packageName).append("'/></td>")
121                         .append("<td></td>")
122                         .append("</tr>");
123                 }
124             }
125             catch (NameNotFoundException e)
126             {
127                 Log.e(TAG, "get app info error: ", e);
128                 continue;
129             }
130         }
131         
132         buf.append("</table>");
133         
134         PrintWriter writer = response.getWriter();
135         writer.write(buf.toString());
136         writer.flush();
137         response.flushBuffer();
138     }
139 
140     private static Bitmap drawableToBitmap(Drawable drawable)
141     {
142         int w = drawable.getIntrinsicWidth();
143         int h = drawable.getIntrinsicHeight();
144 
145         Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
146         Bitmap bitmap = Bitmap.createBitmap(w, h, config);
147         Canvas canvas = new Canvas(bitmap);
148         drawable.setBounds(0, 0, w, h);
149         drawable.draw(canvas);
150         return bitmap;
151     }
152 }
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