Android Question How to convert to B4A B4XPage code that opens the default calculator apps by intent

toby · May 21, 2023

The code below is supposed to open the default calculator apps on a device. Could some expert kindly convert it to B4A?

TIA

B4X:

Intent intent = new Intent();
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

Source

teddybear · May 22, 2023

toby said:
This solution works for old default projects (activity). But B4XPage projects cause the error mentioned in post #3. Any guru can make it work for B4XPage projects?

For B4xPage project you posted #3, you only need to move the inline java code into Main module. it will work

teddybear · May 21, 2023

Here is B4A code
Note: It does not work in android emulator

B4X:

Sub Button1_Click
    Dim jo As JavaObject
    jo.InitializeContext
    jo.RunMethod("openCalculator", Null)
End Sub

#If JAVA
import android.content.Intent;
public void openCalculator() {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
   }
#End If

toby · May 21, 2023

I got the "cannot find symbol startActivity(intent);
" error while compiling the above code. Could someone tell me what went wrong, please? Test app attached.

TIA

B4A Version: 12.20
Parsing code. (0.03s)
Java Version: 11
Building folders structure. (0.01s)
Running custom action. (0.04s)
Compiling code. (0.07s)
Compiling layouts code. (0.00s)
Organizing libraries. (0.00s)
(AndroidX SDK)
Compiling resources (0.07s)
Linking resources (0.29s)
Compiling debugger engine code. (1.59s)
Compiling generated Java code. Error
B4A line: 15
End Sub
src\com\ddg\test\b4xmainpage.java:112: error: cannot find symbol
startActivity(intent);
^
symbol: method startActivity(Intent)
location: class b4xmainpage

Alex_197 · May 21, 2023

toby said:
I got the "cannot find symbol startActivity(intent);
" error while compiling the above code. Could someone tell me what went wrong, please? Test app attached.

TIA

I'm not sure if B4XPages supports StartActivity.

Alex_197 · May 21, 2023

https://www.b4x.com/android/forum/threads/calculator-intent.94392/

Alex_197 · May 21, 2023

Check my project

B4X:

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Private xui As XUI
End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub Button1_Click
    Dim jo As JavaObject
    jo.InitializeContext
    jo.RunMethod("openCalculator", Null)
End Sub

#If JAVA
import android.content.Intent;
public void openCalculator() {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
   }
#End If

Private Sub Button2_Click
    Dim Pm As PackageManager 'Phone library
    Dim Inte As Intent
    For Each st As String In Pm.GetInstalledPackages
        If st.Contains("calc") =True Then
            Inte=Pm.GetApplicationIntent(st)
            If Inte.IsInitialized Then StartActivity(Inte)
            Exit
        End If
    Next
End Sub

toby · May 21, 2023

Alex_197 said:
jo.RunMethod("openCalculator", Null)

Does it work for you?

Alex_197 · May 21, 2023

toby said:
Does it work for you?

yes it does. check my attached project

toby · May 21, 2023

Alex_197 said:
st.Contains("calc") =True

The problem associated with this approach is that Google considers the required permission QUERY_ALL_PACKAGES dangerous and wouldn't allow an app to have it normally.

Alex_197 · May 21, 2023

toby said:
The problem associated with this approach is that Google considers the required permission QUERY_ALL_PACKAGES dangerous and wouldn't allow an app to have it normally.

my project doesn't need this permission - check it

toby · May 21, 2023

teddybear said:

Here is B4A code
Note: It does not work in android emulator

B4X:

Sub Button1_Click
    Dim jo As JavaObject
    jo.InitializeContext
    jo.RunMethod("openCalculator", Null)
End Sub

#If JAVA
import android.content.Intent;
public void openCalculator() {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
   }
#End If

This solution works for old default projects (activity). But B4XPage projects cause the error mentioned in post #3. Any guru can make it work for B4XPage projects?

toby · May 21, 2023

Alex_197 said:
yes it does. check my attached project

My project failed because it's B4XPage project while yours work because it's an activity based project. Now I'm wondering how to make it work with B4Xpage projects

toby · May 21, 2023

Alex_197 said:
my project doesn't need this permission - check it

Using your test app, when I clicked Button2, nothing happened until I added the following to the Manifest

B4X:

AddManifestText(<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"/>)

This requirement is confirmed at this post

About my test phone: Google Pixel 4A, Android 13

teddybear · May 22, 2023

toby said:
This solution works for old default projects (activity). But B4XPage projects cause the error mentioned in post #3. Any guru can make it work for B4XPage projects?

For B4xPage project you posted #3, you only need to move the inline java code into Main module. it will work

Android Question How to convert to B4A B4XPage code that opens the default calculator apps by intent

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