Return code do not work

Open Source Development Extension Development
1

Return code do not work
Code

import android.app.Activity;

import com.google.appinventor.components.annotations.DesignerComponent;

import com.google.appinventor.components.annotations.SimpleEvent;

import com.google.appinventor.components.annotations.SimpleFunction;

import com.google.appinventor.components.annotations.SimpleObject;

import com.google.appinventor.components.common.ComponentCategory;

import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;

import com.google.appinventor.components.runtime.ComponentContainer;

import com.google.appinventor.components.runtime.EventDispatcher;

import com.google.appinventor.components.runtime.util.AsynchUtil;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URL;

@DesignerComponent(version = 1,

       category = ComponentCategory.EXTENSION,

       description = "Made my YOU",

       nonVisible = true,

       iconName = "ICON LINK")

@SimpleObject(external = true)

public class pereodix_1 extends AndroidNonvisibleComponent {

   private Activity activity;

   public pereodix_1(ComponentContainer container) {

       super(container.$form());

       activity = container.$context();

   }

   @SimpleFunction

   public Object DoRequest(final String op) {

       AsynchUtil.runAsynchronously(new Runnable() {

           @Override

           public void run() {

               BufferedReader in;

               try {

                   in = new BufferedReader(

                           new InputStreamReader(

                                   new URL("my api comes here "+op).openStream()));

                   String inputLine;

                   final StringBuilder result = new StringBuilder();

                   while ((inputLine = in.readLine()) != null)

                       result.append(inputLine);

                   in.close();
              
                   return result;

               } catch (IOException e) {

                   e.printStackTrace();

               }

           }
       });
   }

Error

Started Compiling Project pereodix_1
Buildfile: /compiler/android/build.xml

javac:
[mkdir] Created dir: /compiler/android/build/HVYHE/classes
[javac] Compiling 1 source file to /compiler/android/build/HVYHE/classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] warning: In component pereodix_1, method DoRequest is missing a description.
[javac] Note: Wrote file file:/compiler/android/build/HVYHE/classes/simple_components.json
[javac] warning: In component pereodix_1, method DoRequest is missing a description.
[javac] Note: Wrote file file:/compiler/android/build/HVYHE/classes/simple_components.txt
[javac] Note: Wrote file file:/compiler/android/build/HVYHE/classes/simple_components_build_info.json
[javac] warning: In component pereodix_1, method DoRequest is missing a description.
[javac] Note: Wrote file file:/compiler/android/build/HVYHE/classes/AutogeneratedOdeMessages.java
[javac] Note: Wrote file file:/compiler/android/build/HVYHE/classes/ComponentsTranslation.java
[javac] warning: In component pereodix_1, method DoRequest is missing a description.
[javac] /compiler/android/src/HVYHE/com/yash/pereodix/pereodix_1.java:78: error: incompatible types: unexpected return value
[javac] return result;
[javac] ^
[javac] 1 error
[javac] 4 warnings
2

You can't return anything from void methods

3

How can you tell me

4

I can't because, You gets angry when we say Learn Basics :grimacing: :grimacing:
Btw

2 Likes
5 
import android.app.Activity;

import com.google.appinventor.components.annotations.DesignerComponent;

import com.google.appinventor.components.annotations.SimpleEvent;

import com.google.appinventor.components.annotations.SimpleFunction;

import com.google.appinventor.components.annotations.SimpleObject;

import com.google.appinventor.components.common.ComponentCategory;

import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;

import com.google.appinventor.components.runtime.ComponentContainer;

import com.google.appinventor.components.runtime.EventDispatcher;

import com.google.appinventor.components.runtime.util.AsynchUtil;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URL;

@DesignerComponent(version = 1,

        category = ComponentCategory.EXTENSION,

        description = "Made my YOU",

        nonVisible = true,

        iconName = "ICON LINK")

@SimpleObject(external = true)

public class pereodix_1 extends AndroidNonvisibleComponent {

    private Activity activity;

    public pereodix_1(ComponentContainer container) {

        super(container.$form());

        activity = container.$context();

    }

    @SimpleFunction

    public Object DoRequest(final String op) {

                BufferedReader in;

                try {

                    in = new BufferedReader(

                            new InputStreamReader(

                                    new URL("my api comes here "+op).openStream()));

                    String inputLine;

                    final StringBuilder result = new StringBuilder();

                    while ((inputLine = in.readLine()) != null)

                        result.append(inputLine);

                    in.close();
               
                    return result;

                } catch (IOException e) {

                    e.printStackTrace();

                }
    }
```
6

Is this is correct

7

May this help you - Fetching from API. Please Help me

8

No, it will throw NetworkOnMainThreadException

9

The code in first post was correct, But instead of returning the result create an event, so users can access the result through it

10

I do that and that work but I want to return like this

11

That was recommended way but perhaps You can create a variable to store the result and then return that variable in another method.

String myResult = null;

public void DoReq(){
    // your code for http request
    myResult = result;
}

@SimpleFunction
public String ReturnResult(){
    DoReq();
    if (myResult != null){
        return myResult;
    } else {
        return "something";
    }
    
}
12

Also that do not work

13

That's why I said to use an event

14

Is there no any way to return like this

15

A piece of code -

AsynchUtil.runAsynchronously(new Runnable() {
            @Override
            public void run() {
                try {
                    URL u = new URL("YOUR API" + op);
                    HttpURLConnection con = (HttpURLConnection) u.openConnection();
                    BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream()));
                    StringBuilder sb = new StringBuilder();
                    String line;
                    while ((line = br.readLine()) != null) {
                        sb.append(line).append("\n");
                    }
                    br.close();
                    postText(sb.toString());
                } catch (Exception ex) {
                    ex.printStackTrace();
                    postText(ex.getMessage() != null?ex.getMessage():ex.toString());
                }
            }
        });
    }
    public void postText(final String text){
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                GotResult(text);
            }
        });
    }

Try it...

1 Like
16

I have attatched sample code here. but still I recommend to use event

17

That's not the matter. His question is different.

18

use this line outside your function
return result;

19

Unfortunately you can't access it outside the run method

20

i'm sorry my mistake, i mean :

@SimpleFunction
public String ReturnResult(String result1, String result2){
    String dataResult;
    if (result1.isEmpty()){
        dataResult ="code1";
    } else {
        dataResult ="code2";
    }
    return dataResult;
}