Android determines whether the current device is a mobile phone or tablet or an android tablet.

Android determines whether the current device is a mobile phone or tablet or an android tablet.

Android development needs to adapt to mobile phones and tablets. In some cases, it is necessary to determine whether the device is a mobile phone or tablet.
On the Internet, it is often said that the device size, DPI, version number, and whether the phone function is available are used to determine whether the device is accurate.
Here is a concise and powerful method (official usage ):

CREATE TABLE  `friends` (
  `Id` int(10) unsigned NOT NULL auto_increment,
  `providerId` int(10) unsigned NOT NULL default '0',
  `requestId` int(10) unsigned NOT NULL default '0',
  `status` binary(1) NOT NULL default '0',
  PRIMARY KEY  (`Id`),
  UNIQUE KEY `Index_3` (`providerId`,`requestId`),
  KEY `Index_2` (`providerId`,`requestId`,`status`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='providerId is the Id of the users who wish to be friend with';

CREATE TABLE  `users` (
  `Id` int(10) unsigned NOT NULL auto_increment,
  `username` varchar(45) NOT NULL default '',
  `password` varchar(32) NOT NULL default '',
  `email` varchar(45) NOT NULL default '',
  `date` datetime NOT NULL default '0000-00-00 00:00:00',
  `status` tinyint(3) unsigned NOT NULL default '0',
  `authenticationTime` datetime NOT NULL default '0000-00-00 00:00:00',
  `userKey` varchar(32) NOT NULL default '',
  `IP` varchar(45) NOT NULL default '',
  `port` int(10) unsigned NOT NULL default '0',
  PRIMARY KEY  (`Id`),
  UNIQUE KEY `Index_2` (`username`),
  KEY `Index_3` (`authenticationTime`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

To determine whether the phone function is available (you can call some tablets now ):

 public String sendHttpRequest(String params)
 
        {               
 
                URL url;
 
                String result = new String();
 
                try 
 
                {
 
                        url = new URL(AUTHENTICATION_SERVER_ADDRESS);
 
                        HttpURLConnection connection;
 
                        connection = (HttpURLConnection) url.openConnection();
 
                        connection.setDoOutput(true);
 
                        
 
                        PrintWriter out = new PrintWriter(connection.getOutputStream());
 
                        
 
                        out.println(params);
 
                        out.close();
 

 
                        BufferedReader in = new BufferedReader(
 
                                        new InputStreamReader(
 
                                                        connection.getInputStream()));
 
                        String inputLine;
 

 
                        while ((inputLine = in.readLine()) != null) {
 
                                result = result.concat(inputLine);                              
 
                        }
 
                        in.close();                     
 
                } 
 
                catch (MalformedURLException e) {
 
                        e.printStackTrace();
 
                } 
 
                catch (IOException e) {
 
                        e.printStackTrace();
 
                }                       
 
                
 
                if (result.length() == 0) {
 
                        result = HTTP_REQUEST_FAILED;
 
                }
 
                
 
                return result;
 
                
 
        
 
        }
 

 

 

 
        public boolean sendMessage(String message, String ip, int port) 
 
        {
 
                try {
 
                        
 
                        
 
                        String[] str = ip.split("\\.");
 
                        
 
                        byte[] IP = new byte[str.length];
 
                        
 
                        for (int i = 0; i < str.length; i++) {
 
                                
 
                                IP[i] = (byte) Integer.parseInt(str[i]);                                
 
                        }
 
                        Socket socket = getSocket(InetAddress.getByAddress(IP), port);
 
                        if (socket == null) {
 
                                return false;
 
                        }
 
                
 
                        PrintWriter out = null;
 
                        out = new PrintWriter(socket.getOutputStream(), true);
 
                        
 
                        out.println(message);
 
                } catch (UnknownHostException e) {                      
 
                        return false;
 
                        //e.printStackTrace();
 
                } catch (IOException e) {
 
                        return false;                   
 
                        //e.printStackTrace();
 
                }
 
                
 
                return true;            
 
        }

 

As for the device size, resolution, and version number, I personally think that the accuracy is too poor and it is not recommended.