어플 종료 관련 소스인데요
이 기능을 하나의 클래스로 만들어서 필요할때마다 불러다 쓰고 싶은데요
어떻게 해야 되는지 모르겠어요.
힌트라도 좀 부탁드릴께요.

@Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  Toast.makeText(mContext, "aaa", 1).show();
  //if (keyCode == KeyEvent.KEYCODE_BACK  && event.getRepeatCount() == 0) {
   //event.startTracking();
   AlertDialog.Builder builder = new AlertDialog.Builder(((Activity)mContext));
   builder.setMessage("어플리케이션을 종료하시겠습니까 ?");
   builder.setCancelable(false)
   .setPositiveButton("예", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
     onBackPressed();
     
    }
   })
   .setNegativeButton("아니오", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
     dialog.cancel();
    }
   });
   AlertDialog alert = builder.create();
   alert.show();
      return true;  
     //}
     
     //return super.onKeyDown(keyCode, event);
  //return false;
    } 
   
    public void onBackPressed(){
     ((Activity)mContext).finish();
     requestKillProcess(mContext);
    }

    public void requestKillProcess(Context context){
     new Thread(new Runnable() {
      @Override
      public void run() {
       ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
       String name = mContext.getApplicationInfo().processName;
       RunningServiceInfo si;
       
       //pooling the current application process importance information.
       while(true){
        List<RunningAppProcessInfo> list = am.getRunningAppProcesses();
        for(RunningAppProcessInfo i : list){
         if(i.processName.equals(name) == true){
          //#4. kill the process,
          //only if current application importance is less than IMPORTANCE_BACKGROUND
          if(i.importance >= RunningAppProcessInfo.IMPORTANCE_BACKGROUND){
           //if(i.importance >= RunningAppProcessInfo.IMPORTANCE_SERVICE){
           am.restartPackage(mContext.getPackageName());    //simple wrapper of killBackgrounProcess
          }else{
           //finish();
           Thread.yield();
          }
          break;
         }
        }
       }
      }
      
     }, "Process Killer").start();
    }