How can i ask list in extension

Open Source Development Extension Development
1

i am made an extension
which is my first extension two months ago from

https://medium.com/@saitwalshreyash19/writing-your-first-app-inventor-2-extension-dc6d5d4ff824

by @shreyash now once i learnt some what on Open Source Development Extensions
now i want to input many colors

actual code

@SimpleFunction(description = "this block is where u put ur component,colors,u may have dout what is orientation it is where u put the green block i gave in gradients section")
public void SetGradientBackground3color(AndroidViewComponent component, Object orientation, int color1, int color2) {

// To set gradient colors as background, what we are actually going to 
// do is create a new GradientDrawable object and set it as 
// the background of the view. With this approach, it'd be possible to 
// create gradients programmatically without editing the manifest
// file which is currently not supported in App Inventor 2.

// Getting the reference to the View of the parameter component using 
// the getView() method of AndroidNonVisible class.
View view = component.getView();

// GradientDrawable is a subclass of Drawable class from Android
// support library. It is mostly used to create gradients.
// For more info visit: https://developer.android.com/reference/android/graphics/drawable/GradientDrawable
GradientDrawable gradientDrawable = new GradientDrawable(
        (GradientDrawable.Orientation) orientation,
        new int[] {color1, color2});

// Setting the gradientDrawable as the background of view.
view.setBackground(gradientDrawable);

}

how i converted to 3 colors

in this code at this line

GradientDrawable gradientDrawable = new GradientDrawable(
(GradientDrawable.Orientation) orientation,
new int {color1, color2});

i just changed

       new int[] {color1, color2});

to

new int {color1, color2, color3});

and

@SimpleFunction(description = "this block is where u put ur component,colors,u may have dout what is orientation it is where u put the green block i gave in gradients section")
public void SetGradientBackground3color(AndroidViewComponent component, Object orientation, int color1, int color2) {

to

@SimpleFunction(description = "this block is where u put ur component,colors,u may have dout what is orientation it is where u put the green block i gave in gradients section")
public void SetGradientBackground3color(AndroidViewComponent component, Object orientation, int color1, int color2,int color3) {

for 3 colors it works perfectly

now my goal is to achieve unlimited colors

so what i did

i first

@SimpleFunction(description = "")
public void SetGradientBackground2color(AndroidViewComponent component, Object orientation,int color1, int color2) {

converted this line to

@SimpleFunction(description = "")
public void SetGradientBackground2color(AndroidViewComponent component, Object orientation, YailList colors) {

and for this i added

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

this line as i need yail list

So what i need

but now i have a doubt how should i change my code now to put list here

       new int[] {color1, color2});

please help

thanks

2

First of all, what is the issue you are facing?

3

i have tried

       new int[] {color1, color2});

to
new int {colors});

so my code is

@SimpleFunction(description = "this block is where u put ur component,colors,u may have dout what is orientation it is where u put the green block i gave in gradients section")
public void SetGradientBackground2color(AndroidViewComponent component, Object orientation, YailList colors) {

// To set gradient colors as background, what we are actually going to 
// do is create a new GradientDrawable object and set it as 
// the background of the view. With this approach, it'd be possible to 
// create gradients programmatically without editing the manifest
// file which is currently not supported in App Inventor 2.

// Getting the reference to the View of the parameter component using 
// the getView() method of AndroidNonVisible class.
View view = component.getView();

// GradientDrawable is a subclass of Drawable class from Android
// support library. It is mostly used to create gradients.
// For more info visit: https://developer.android.com/reference/android/graphics/drawable/GradientDrawable
GradientDrawable gradientDrawable = new GradientDrawable(
        (GradientDrawable.Orientation) orientation,

new int {colors} );

// Setting the gradientDrawable as the background of view.
view.setBackground(gradientDrawable);

}
and error
is
[javac] C:\Users\GOD\appinventor-sources\appinventor\components\src\edu\hifiapps\Gradient\Gradient.java:52: error: incompatible types: YailList cannot be converted to int
[javac] new int {colors} );
[javac] ^

4

To convert integer array:

@SimpleFunction
    public void example(YailList list) {
        int[] array = new int[list.size()];
        int index = 0;
        for(String e : list.toStringArray()) {
            array[index] = Integer.parseInt(e);
            index++;
        }
    }

Now in the variable called array you have the values.

5

They are called arrays.

6

so like this
new array[] {colors} );

7

What are you trying to do? You have already converted into an int array.

1 Like
8

Just use array and not new array[] {colors} );

1 Like
9

got it i will try

GradientDrawable gradientDrawable = new GradientDrawable(
        (GradientDrawable.Orientation) orientation,colors);
1 Like
10

First do as mentioned above and just use:

GradientDrawable gradientDrawable = new GradientDrawable(
        (GradientDrawable.Orientation) orientation, array);
1 Like
11

sorry i dint see the above post i will try

12

Just add this code, then do:

13

You're trying to take list input from the user and turn it into gradient right?

14

yes
but its just sample code its not main extension i will use for future purpose

1 Like
15

my code
int[] array = new int[list.size()]; int index = 0;for(String e : list.toStringArray()) { array[index] = Integer.parseInt(e); index++; }

GradientDrawable gradientDrawable = new GradientDrawable(
(GradientDrawable.Orientation) orientation, array);

my error
[javac] C:\Users\GOD\appinventor-sources\appinventor\components\src\edu\hifiapps\Gradient\Gradient.java:50: error: cannot find symbol
[javac] int[] array = new int[list.size()]; int index = 0; for(String e : list.toStringArray()) { array[index] = Integer.parseInt(e); index++; }
[javac] ^
[javac] symbol: variable list
[javac] location: class Gradient
[javac] C:\Users\GOD\appinventor-sources\appinventor\components\src\edu\hifiapps\Gradient\Gradient.java:50: error: cannot find symbol
[javac] int[] array = new int[list.size()]; int index = 0; for(String e : list.toStringArray()) { array[index] = Integer.parseInt(e); index++; }
[javac] ^
[javac] symbol: variable list
[javac] location: class Gradient

16

How can that error occur? It should NOT occur.

1 Like
17

i think it is because the ; is nearby it should be in each line end see my code
gsgs.JPG

18

I thought it's occured for Integer.parseInt
my mistake :sweat_smile:

1 Like
19

Can you please post you're new code?

20

i posted and once more do u need as text or image