Android Question Change fontScale on elongated screens

[Ilya G.]

The variable scale is equal to 1.78, but for some reason the condition does not work, how to make a comparison correctly?

Sub Process_Globals
    Public scale As Double = Round2(GetDeviceLayoutValues.Height / GetDeviceLayoutValues.Width, 2) 'ignore
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        #if Java
            import android.content.*;
            import android.content.res.*;
            @Override
            protected void attachBaseContext(Context newBase) {
                super.attachBaseContext(newBase);
                final Configuration override = new Configuration(newBase.getResources().getConfiguration());
                
                if (override.fontScale > 1.0f) {
                    override.fontScale = 1.0f;
                }
                
                if (_scale != 1.78) {
                    override.fontScale = 0.8f;
                }
                
                applyOverrideConfiguration(override);
            }
        #End If
    End If
End Sub

 

[Ilya G.]

I tried different things, but the condition does not work

if (_scale.equals("1.78")) {
    override.fontScale = 0.5f;
}

if (_scale.toString().equals("1.78")) {
    override.fontScale = 0.5f;
}

if (_scale.toString().equals("1.78".toString())) {
    override.fontScale = 0.5f;
}

if (_scale.toString().compareTo("1.78") == 0) {
    override.fontScale = 0.5f;
}

if (_scale.toString().compareTo("1.78".toString()) == 0) {
    override.fontScale = 0.5f;
}

 

[Erel]

What is the purpose of this strange code? Why use inline Java? And you are using it incorrectly.

 

[Ilya G.]

What is the purpose of this strange code? Why use inline Java? And you are using it incorrectly.

I want to make fonts smaller on elongated screens like 2400*1080

 

[Erel]

I want to make fonts smaller on elongated screens like 2400*1080

The resolution without the scale is meaningless.

You need to think in device screen size (inches / centimeters).

 

[Ilya G.]

The resolution without the scale is meaningless.

You need to think in device screen size (inches / centimeters).

I thought this was a simple way to influence the size of the entire application at once. How to make a comparison work?

 

[Ilya G.]

Why the first one doesn’t work, but the second one does?

Sub Process_Globals
    Public scale As String = "1.78"
End Sub



if (_scale.equals("1.78")) {
    does not work
}

if ("1.78".equals("1.78")) {
    work
}

 

[Brian Dean]

What you are calling "scale" is the aspect ratio of the device screen, and you seem to be wanting to check if this is above a certain value. Why are you not using something like the following code . . .

    Dim aspectRatio As Float = GetDeviceLayoutValues.Height / GetDeviceLayoutValues.Width
    If (aspectRatio > 1.78) Then
        
    End If

Your approach seems to be horrendously complicated and full of risk - checking a truncated floating point number for precise equality is not good practice.

 

[Ilya G.]

What you are calling "scale" is the aspect ratio of the device screen, and you seem to be wanting to check if this is above a certain value. Why are you not using something like the following code . . .

    Dim aspectRatio As Float = GetDeviceLayoutValues.Height / GetDeviceLayoutValues.Width
    If (aspectRatio > 1.78) Then
   
    End If

Your approach seems to be horrendously complicated and full of risk - checking a truncated floating point number for precise equality is not good practice.

I need to change font scale like in this topic, this is only possible with the InlineJava

 

[Brian Dean]

Okay - so after you have checked the aspect ratio in B4A switch to Java.

 

[Ilya G.]

I does not understand how to make this? I need to set fontScale = 0.8 if aspectRatio > 1.78, and else fontScale = 1.0

 

[Brian Dean]

I don't use Java, but why would this not work . . .

    Dim aspectRatio As Float = GetDeviceLayoutValues.Height / GetDeviceLayoutValues.Width
    If (aspectRatio > 1.78) Then
        #if java
           ' Put Java code to change the font scale here . . .
        #End If
    End If

If the aspect ratio is not greater than 1.78 then the font scale will be unchanged - 1.0 presumably.

 

[Ilya G.]

If the aspect ratio is not greater than 1.78 then the font scale will be unchanged - 1.0 presumably.

No, if the user has set the font size to large in the system settings

    Dim aspectRatio As Float = GetDeviceLayoutValues.Height / GetDeviceLayoutValues.Width
    If (aspectRatio > 1.78) Then
        #if java
           ' Put Java code to change the font scale here . . .
        #End If
    End If

I already tried this, but I get an error:

If GetDeviceLayoutValues.Height / GetDeviceLayoutValues.Width = 1.78 Then
    #if Java
        import android.content.*;
        import android.content.res.*;

        @Override
        protected void attachBaseContext(Context newBase) {
            super.attachBaseContext(newBase);
            final Configuration override = new Configuration(newBase.getResources().getConfiguration());

            if (override.fontScale > 1.0f) {
                override.fontScale = 1.0f;
                applyOverrideConfiguration(override);
            }
        }
    #End If
Else
    #if Java
        import android.content.*;
        import android.content.res.*;

        @Override
        protected void attachBaseContext(Context newBase) {
            super.attachBaseContext(newBase);
            final Configuration override = new Configuration(newBase.getResources().getConfiguration());

            override.fontScale = 0.8f;
            applyOverrideConfiguration(override);
        }
    #End If
End If

B4A Version: 12.80
Parsing code.    (0.38s)
    Java Version: 11
Building folders structure.    (0.16s)
Running custom action.    (0.29s)
Compiling code.    (1.01s)
Compiling layouts code.    (0.01s)
Organizing libraries.    (0.00s)
    (AndroidX SDK)
Compiling resources    (0.19s)
Linking resources    (0.94s)
Compiling generated Java code.    Error
src\phbk\sales\main.java:503: error: method attachBaseContext(Context) is already defined in class main
                protected void attachBaseContext(Context newBase) {
                               ^
Note: src\phbk\sales\main.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

javac 11.0.1

 

[Brian Dean]

I have been thinking a lot about your problem. If I understand correctly you intend to change the font settings in Accessibility options if your app runs on "elongated" devices. Isn't this very bad practice? If I had a vision impairment and had set the accessibility font size to a particular value I would not like to have to reset it every time after running your app. If I had not changed the font setting I would not like to find that the font size was changed in all my apps after running your app. Surely the correct approach would be to adjust the font sizes in the appropriate views within your app. Yes, very inconvenient for you but that is better than inconveniencing your customer.

If I have misunderstood what you are doing then I appologise - sorry to have wasted your time.

 

[Ilya G.]

I checked, this does not affect the system settings, only my application.
In any case, thanks for the help, I didn’t think that comparing variables in Java is such a complex operation that I can’t handle

 

[Daestrum]

Your error in post #13 is caused by you having the same inline code in 2 places.
When you use #If Java ... #End If, it will include the enclosed java into the source file (normally at the end). This is irrespective of any B4X code you surround it with, as in your code you check a value, and want to include one block for = 1.78 or another block for <> 1.78.
In reality both inline blocks are compiled into the code.

Set a variable in B4X and use that in the inline code.

 

[Ilya G.]

Set a variable in B4X and use that in the inline code.

I came to the same conclusion, but I can't figure out how to compare the variable correctly (post #2 and #7)