/**
  * 查询全部的锁定的包名
  *
  * @return
  */
 public List<String> findAll() {
   SQLiteDatabase db = helper.getReadableDatabase();
   Cursor cursor = db.query("info", new String[] {"packagename"}, null, null, null, null, null);
   List<String> packnames = new ArrayList<String>();
   while (cursor.moveToNext()) {
     packnames.add(cursor.getString(0));
   }
   cursor.close();
   db.close();
   return packnames;
 }
 /**
  * 查询当前的包是否在程序锁里面
  *
  * @param packageName
  * @return
  */
 public boolean find(String packageName) {
   boolean result = false;
   SQLiteDatabase db = helper.getReadableDatabase();
   Cursor cursor =
       db.query("info", null, "packagename=?", new String[] {packageName}, null, null, null);
   if (cursor.moveToNext()) {
     result = true;
   }
   cursor.close();
   db.close();
   return result;
 }