How to create this type of block of json utils

Nami_Chand · May 14, 2021, 8:27am

component_method

I want learn.

vknow360 · May 14, 2021, 8:31am

With simple json library it would look something like this:

@SimpleFunction
public Object GetValue(String object,String key){
    JSONObject jObject = (JSONObject) new JSONParser().parse(object);
    return jObject.get(key);
}

However, if you are just starting with Java then it is recommended to not mess up with json.

iamwsumit · May 14, 2021, 8:33am

Library??
I don’t think it need any library

vknow360 · May 14, 2021, 8:33am

Why do you think so?
I don’t trust the json lib included in sources.
json simple library is just 16 kb in size.

iamwsumit · May 14, 2021, 8:35am

@vknow360 I had used JSON in my first extension for parsing the data from URL and it didn’t used any library

Nami_Chand · May 14, 2021, 8:36am

Tell me about its library.
what we import.

vknow360 · May 14, 2021, 8:40am

Yes, org.json comes bundled with app inventor sources.
But that contains more than what is needed for using json.

https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple/1.1
Add this to /lib/deps if you are using extension template.

iamwsumit · May 14, 2021, 8:42am

Here’s my code

 @SimpleFunction
public Object GetValue(String object,String key){
    JSONObject object=new JSONObject(object);
    return object.getString(key);
}

But it’s better than using a library

vknow360 · May 14, 2021, 8:43am

You are still using a library.
And that is actually going to increase your extension’s size by 50+ kb.

vknow360 · May 14, 2021, 8:45am

JSONObject is a class org.json package.
It does not seem to fall under Java packages.

Nami_Chand · May 14, 2021, 8:48am

I got an error from using this code

Buildfile: /projects/goldv2/appinventor-sources/appinventor/build.xml

extensions:

clean:
[delete] Deleting directory /projects/goldv2/appinventor-sources/appinventor/components/build

BUILD FAILED
/projects/goldv2/appinventor-sources/appinventor/build.xml:34: The following error [delete] Deleting directory /projects/goldv2/appinventor-sources/appinventor/components/reports

init:

common_CommonUtils:

init:

CommonUtils:

common_CommonVersion:

init:

CommonVersion:
[exec] Result: 128
[exec] Result: 128

CopyToRunLibDir:

components_AndroidRuntime:

init:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/build/components
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/reports
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/reports/raw
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/reports/html

CommonConstants:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes/CommonConstants
[javac] Compiling 6 source files to /projects/goldv2/appinventor-sources/appinventor/components/build/classes/CommonConstants
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] 1 warning
[javac] Creating empty /projects/goldv2/appinventor-sources/appinventor/components/build/classes/CommonConstants/com/google/appinventor/components/common/package-info.class
[jar] Building jar: /projects/goldv2/appinventor-sources/appinventor/build/components/CommonConstants.jar
[jar] Building jar: /projects/goldv2/appinventor-sources/appinventor/build/components/CommonConstants-gwt.jar

HtmlEntities:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes/HtmlEntities
[javac] Compiling 1 source file to /projects/goldv2/appinventor-sources/appinventor/components/build/classes/HtmlEntities
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] 1 warning
[jar] Building jar: /projects/goldv2/appinventor-sources/appinventor/components/build/HtmlEntities.jar

common_CommonVersion:

init:

CommonVersion:
[exec] Result: 128
[exec] Result: 128

AndroidRuntime:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes/AndroidRuntime
[javac] Compiling 332 source files to /projects/goldv2/appinventor-sources/appinventor/components/build/classes/AndroidRuntime
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] /projects/goldv2/appinventor-sources/appinventor/components/src/com/appybuilder/chand_nami_2000/Request/Request.java:101: error: variable object is already defined in method GetValue(String,String)
[javac] JSONObject object = (JSONObject) new JSONParser().parse(object);
[javac] ^
[javac] /projects/goldv2/appinventor-sources/appinventor/components/src/com/appybuilder/chand_nami_2000/Request/Request.java:101: error: cannot find symbol
[javac] JSONObject object = (JSONObject) new JSONParser().parse(object);
[javac] ^
[javac] symbol: class JSONParser
[javac] location: class Request
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] 2 errors
[javac] 1 warning

BUILD FAILED
/projects/goldv2/appinventor-sources/appinventor/build.xml:35: The following error occurred while executing this line:
/projects/goldv2/appinventor-sources/appinventor/build-common.xml:372: The following error occurred while executing this line:
/projects/goldv2/appinventor-sources/appinventor/components/build.xml:141: The following error occurred while executing this line:
/projects/goldv2/appinventor-sources/appinventor/build-common.xml:118: Compile failed; see the compiler error output for details.

Total time: 4 seconds

iamwsumit · May 14, 2021, 8:49am

@Nami_Chand have you imported the library jar file in your extension as @vknow360 said

Nami_Chand · May 14, 2021, 8:50am

No, I am creating extension in AppyBuilder Code Editor.

Nami_Chand · May 14, 2021, 8:51am

Tell me how to import.

iamwsumit · May 14, 2021, 8:52am

You can’t add library in appybuilder code editor then why you have used this code

Nami_Chand · May 14, 2021, 8:53am

Tell me how to import lib in computer software.

vknow360 · May 14, 2021, 8:53am

Then you should use this:

Nami_Chand · May 14, 2021, 8:59am

I got an error from using this code

Buildfile: /projects/goldv2/appinventor-sources/appinventor/build.xml

extensions:

clean:
[delete] Deleting directory /projects/goldv2/appinventor-sources/appinventor/components/build

BUILD FAILED
/projects/goldv2/appinventor-sources/appinventor/build.xml:34: The following error [delete] Deleting directory /projects/goldv2/appinventor-sources/appinventor/components/reports

init:

common_CommonUtils:

init:

CommonUtils:

common_CommonVersion:

init:

CommonVersion:
[exec] Result: 128
[exec] Result: 128

CopyToRunLibDir:

components_AndroidRuntime:

init:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/build/components
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/reports
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/reports/raw
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/reports/html

CommonConstants:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes/CommonConstants
[javac] Compiling 6 source files to /projects/goldv2/appinventor-sources/appinventor/components/build/classes/CommonConstants
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] 1 warning
[javac] Creating empty /projects/goldv2/appinventor-sources/appinventor/components/build/classes/CommonConstants/com/google/appinventor/components/common/package-info.class
[jar] Building jar: /projects/goldv2/appinventor-sources/appinventor/build/components/CommonConstants.jar
[jar] Building jar: /projects/goldv2/appinventor-sources/appinventor/build/components/CommonConstants-gwt.jar

HtmlEntities:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes/HtmlEntities
[javac] Compiling 1 source file to /projects/goldv2/appinventor-sources/appinventor/components/build/classes/HtmlEntities
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] 1 warning
[jar] Building jar: /projects/goldv2/appinventor-sources/appinventor/components/build/HtmlEntities.jar

common_CommonVersion:

init:

CommonVersion:
[exec] Result: 128
[exec] Result: 128

AndroidRuntime:
[mkdir] Created dir: /projects/goldv2/appinventor-sources/appinventor/components/build/classes/AndroidRuntime
[javac] Compiling 332 source files to /projects/goldv2/appinventor-sources/appinventor/components/build/classes/AndroidRuntime
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] /projects/goldv2/appinventor-sources/appinventor/components/src/com/appybuilder/chand_nami_2000/Request/Request.java:101: error: variable object is already defined in method GetValue(String,String)
[javac] JSONObject object=new JSONObject(object);
[javac] ^
[javac] /projects/goldv2/appinventor-sources/appinventor/components/src/com/appybuilder/chand_nami_2000/Request/Request.java:101: error: no suitable constructor found for JSONObject(JSONObject)
[javac] JSONObject object=new JSONObject(object);
[javac] ^
[javac] constructor JSONObject.JSONObject(Map) is not applicable
[javac] (argument mismatch; JSONObject cannot be converted to Map)
[javac] constructor JSONObject.JSONObject(JSONTokener) is not applicable
[javac] (argument mismatch; JSONObject cannot be converted to JSONTokener)
[javac] constructor JSONObject.JSONObject(String) is not applicable
[javac] (argument mismatch; JSONObject cannot be converted to String)
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
[javac] 2 errors
[javac] 1 warning

BUILD FAILED
/projects/goldv2/appinventor-sources/appinventor/build.xml:35: The following error occurred while executing this line:
/projects/goldv2/appinventor-sources/appinventor/build-common.xml:372: The following error occurred while executing this line:
/projects/goldv2/appinventor-sources/appinventor/components/build.xml:141: The following error occurred while executing this line:
/projects/goldv2/appinventor-sources/appinventor/build-common.xml:118: Compile failed; see the compiler error output for details.

Total time: 4 seconds

vknow360 · May 14, 2021, 9:04am

Try this:

@SimpleFunction()
    public Object GetValue(String object,String key){
        try {
            org.json.JSONObject jsonObject = new org.json.JSONObject(object);
            return jsonObject.get(key);
        }catch (Exception e){
            e.printStackTrace();
        }
        return "";
    }

Nami_Chand · May 14, 2021, 9:12am

ok! I had imported this class.
now build is pending.