Android编程之杀毒的实现原理及具体实例

<?xml version="1.0" encoding="utf-8"?>
<list>
<virus>
 <name>tory.virus</name>
 <packname>
cn.itcast.virus
</packname>
 <description>
恶意软件,读取用户日志</description>
 <signature>
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 </signature>
</virus>
</list>

/*
 * 杀毒引擎（下载病毒库、获取程序的包名及签名并进行匹配）
 * (non-Javadoc)
 * @see android.app.Activity#onTouchEvent(android.view.MotionEvent)
 */
@Override
public boolean onTouchEvent(MotionEvent event) {
 packagenames = new ArrayList<String>();
 virusResult = new ArrayList<String>();
 infos = new ArrayList<ApplicationInfo>();
 animationDrawable.start();//播放扫描病毒的动画
 new Thread(){
  @Override
  public void run() {
   try {
    URL url = new URL("http://192.168.1.168:8080/virus.xml");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    InputStream is = conn.getInputStream();
    //从服务器解析病毒库并获取到病毒库的集合
    virusbeans = VirusInfo.getVirusInfos(is);
    TaskInfo taskInfo = new TaskInfo(KillVirusActivity.this); //实例化包资源管理器
    //获取到当前手机里面所有的包名
    infos = pm.getInstalledApplications(0);
    for(ApplicationInfo info : infos ){
     packagenames.add(info.packageName);
    }
    int count=0;
    // 杀毒引擎 根据病毒库 比对当前系统里面的程序包名 签名进行 杀毒
    StringBuilder sb = new StringBuilder();
    for(String packname : packagenames){
     sb.append("正在扫描 "+ packname);
     sb.append("\n");
     Message msg = new Message();
     msg.what = SCANNING;
     msg.obj = sb;
     handler.sendMessage(msg);
     //检查当前的packname 和对应签名 是不是跟病毒库里面的信息一样
     for(VirusBean virusbean : virusbeans){
      if(packname.equals(virusbean.getPackname())&&
        taskInfo.getAppSignature(packname).equals(virusbean.getSignature()))
      {
       virusResult.add(packname);//添加一个病毒
      }
     }
     count ++;//记录病毒的总数
    }
    Message msg = new Message();
    msg.what = SCANNING_FINISH;
    msg.obj = count;
    handler.sendMessage(msg);
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }.start();
 return super.onTouchEvent(event);
}

Handler handler = new Handler(){
 @Override
 public void handleMessage(Message msg) {
  super.handleMessage(msg);
  switch (msg.what) {
  case SCANNING:
   StringBuilder sb = (StringBuilder) msg.obj;
   tv_killvirus_info.setText(sb.toString());
   sv.scrollBy(0, 25);//每次增加都会自动向下移动画面
   break;
  case SCANNING_FINISH:
   int i = (Integer) msg.obj;
   StringBuilder sb1 = new StringBuilder();
   sb1.append("扫描完毕 共扫描 "+ i+ " 个程序");
   if(virusResult.size()>0){
    sb1.append("发现病毒 \n");
     for(String packname : virusResult){
      sb1.append("病毒名"+ packname);
      sb1.append("\n");
     }
    }
    tv_killvirus_info.setText(sb1.toString());
    animationDrawable.stop();
   break;
  }
 }
};

/*
 * 获取程序的签名
 */
public String getAppSignature(String packname){
  try {
   PackageInfo packinfo =pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);
   //获取到所有的权限
   return packinfo.signatures[0].toCharsString();
  } catch (NameNotFoundException e) {
   e.printStackTrace();
   return null;
  }
}

<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/iv_killvirus_am"
android:id="@+id/sv_killvirus"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_killvirus_info"
></TextView>
</ScrollView>