How to set color to an layout in extensions

Open Source Development Extension Development
1 
@SimpleFunction(description = "")
public void bgset(AndroidViewComponent component,int color) {
 View view = component.getView();
 view.setBackgroundColor (color);
}

i am trying to set colour of horrizontal arangement

but i get error
gnu.mapping.SimpleSymbol cannot be cast to java.lang.integer
am i doing anything wrong

2


i got reference from source code of canvas

3

Can you show your imports?

4 
import android.content.Context;
import android.util.Log;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.runtime.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.util.YailList;
import android.view.View;
import android.graphics.Color;
5

amazing it work now sorry it is my net issue

1 Like
6

wait there is another issue
the code

    @SimpleFunction(description = "")
    public void bgset(AndroidViewComponent component,YailList colors) {
     View view = component.getView();
     int index1 = 0;
     for(Object x : colors ) { 
     view.setBackgroundColor((int)x);
     index1++; 
     }
    }

blocks

result
error-gnu.mapping.SimpleSymbol cannot be cast to java.lang.Integer
my last color in list is green so it should be green
i know that the object is related to error

7

Use this:-

    @SimpleFunction(description = "")
    public void bgset(AndroidViewComponent component, List<Integer> colors){
    String listString = colors.toString();
    View view = component.getView();
    final String[] array = listString.split(" ");
            final int[] ints = new int[array.length];
            for (int i = 0; i < array.length; ++i) {
                try {
                    ints[i] = Integer.parseInt(array[i]);
                }
                catch (NumberFormatException ex) {}
            }
view.setBackgroundColor(ints);
    }
8

What are you trying to do??

9

i will try ,

10

/appinventor/components/src/in/hifi/Bgcolour/Bgcolour.java:49: error: incompatible types: int[] cannot be converted to int
[javac] view.setBackgroundColor(ints);

11

setBackgroundColor accepts int but you are giving int array here.

1 Like
12

please follow the

Taifun

1 Like
13

This is just a learn,test extension I will use it in my main extension

14

You can achieve:

Screenshot_20210211-001803_Chrome
Screenshot_20210211-001803_Chrome717×408 58.6 KB

By adding this import:
import gnu.math.IntNum;

And using this code:
@SimpleFunction(description = "")
public void bgset(AndroidViewComponent component,YailList colors) {
View view = component.getView();
Object[] array = colors.toArray();
for(Object x : array) {
IntNum colorX = (IntNum)x;
view.setBackgroundColor(colorX.intValue())
}
}

5 Likes
15

Worked!!!.

1 Like
16

@Ken does that method adds color to the old background color?
Because if it accepts only one value then background color should be the last value of list.

1 Like
17

Ya that's what I need because i have used this as a doubt part of my another extension this I not major extension

18

As you suspected, it doesn't add to the background color, it replaces the color.
The end result of this particular method isn't important, it was only to show how you could iterate through a list of colors.
:arrow_down:

3 Likes
19

quick reminder concerning the naming conventions... :sunglasses:

Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

3 Likes
20

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