Parse and process JSON in Android

When Android calls WebService, it often needs to process the JSON format. Currently, there are two methods:

To process:

1 use jsonobject and jsontokener for parsing

2. Use the gson Library

First, let's look at the first method, for example, the following JSON string:

{

"Name": "myname ",

"Message": ["mymessage1", "mymessage2"],

"Place": "myplace ",

"Date": "thisdate"

}

Solution 1:

Public class main extends activity {

@ Override

Public void oncreate (bundle savedinstancestate ){

Super. oncreate (savedinstancestate );

Setcontentview (R. layout. Main );

Try {

Textview TV = (textview) findviewbyid (R. Id. textview01 );

String JSON = "{"

+ "\" Name \ ": \" myname \","

+ "\" Message \ ": [\" mymessage1 \ ", \" mymessage2 \ "],"

+ "\" Place \ ": \" myplace \","

+ "\" Date \ ": \" thisdate \""

+ "}";

/* Create a JSON object and parse the required values */

Jsonobject object = (jsonobject) New jsontokener (JSON). nextvalue ();

String name = object. getstring ("name ");

String place = object. getstring ("place ");

String date = object. getstring ("date ");

Jsonarray message = object. getjsonarray ("message ");

TV. settext ("Name:" + name + "\ n ");

TV. append ("place:" + place + "\ n ");

TV. append ("Date:" + date + "\ n ");

For (INT I = 0; I <message. Length (); I ++)

{

TV. append ("message:" + message. getstring (I) + "\ n ");

}

2. Use the gson class library

The gson class library provided by Google is:

The Code is as follows:

Public class json_structure {

Public string name;

Public String place;

Public String date;

Public String [] message;

}

This is actually a pojo class.

Try {

/* Inflate textview from the Layout */

Textview TV = (textview) findviewbyid (R. Id. textview01 );

/* JSON data considered as an example. Generally this data is obtained

From a web service .*/

String JSON = "{"

+ "\" Name \ ": \" myname \","

+ "\" Message \ ": [\" mymessage1 \ ", \" mymessage2 \ "],"

+ "\" Place \ ": \" myplace \","

+ "\" Date \ ": \" thisdate \""

+ "}";

Gson = new gson ();

Json_structure OBJ = gson. fromjson (JSON, json_structure.class );

TV. settext ("name:" + obj. Name + "\ n ");

TV. append ("Place:" + obj. Place + "\ n ");

TV. append ("Date:" + obj. Date + "\ n ");

For (INT I = 0; I <obj. Message. length; I ++)

{

TV. append ("message:" + obj. Message [I] + "\ n ");

}

}

Catch (exception ex) {ex. printstacktrace ();}

}

} Catch (jsonexception e) {e. printstacktrace ();}

Catch (exception ex) {ex. printstacktrace ();}

}

}