Develop Reference

How to restart an app programmatically for android?

First of all, I know a little bit about restarting an app. but that's when it is for windows. In this case, I need to make this for an app that is from android. I couldn't find a solution for it that works in Delphi. Just found this from #Mihai Limbășan I quote:
Perhaps you should think outside the box. Instead of futzing with the
mutex/instance logic, you could simply create another executable that
waits for your app to close then starts it again. As an added bonus,
you can later use this mechanism to, for example, update some of your
main app's binaries. It's also much easier to run it elevated instead
of maintaining different integrity levels inside the same app, etc.
But have no idea how this works or even where to start...
Every tip, code sample, or maybe other solution to restart an app will be appreciated.
EDIT
after some questions here are some pieces of code from the procedure.
First.
after you choose for example the language 'English and push the button save this happens
Inifile := TIniFile.Create(fPath);
try
Inifile.WriteString('Instelling','ip',edit5.text);
Inifile.WriteString('Instelling','user',edit6.text);
Inifile.WriteString('Instelling','pixels',edit3.text);
Inifile.WriteInteger('Instelling','language',Combobox2.ItemIndex);
fGebruiker := Edit6.Text;
fFotoformaat := StrToInt(edit3.Text);
finally
FDConnection1.Params.Values['server']:=edit5.Text;
FDConnection1.Connected := True;
inifile.free;
End;
with this code, I fill an inifile with data as you see also the item index of the Combobox for the language.
on this point i restart the app manually so the right language is chosen by this code:
procedure TfmMain.FormShow(Sender: TObject);
VAR
param : string;
inifile : tInifile;
begin
if (System.SysUtils.fileexists(fPath)) then
Begin
begin
Inifile := TIniFile.Create(fPath);
try
if not (Inifile.ReadString('Instelling','ip','default')='default') and not (Inifile.ReadString('Instelling','Gebruiker','default')='default')then
try
edit5.text := Inifile.ReadString('Instelling','ip','default');
edit6.text := Inifile.ReadString('Instelling','user','default');
Edit3.text := Inifile.ReadString('Instelling','pixel','400');
combobox2.ItemIndex := IniFile.ReadInteger('Instelling','language',1);
fpixel:= StrToInt(edit3.Text);
fuser:=edit6.text;
FDConnection1.Params.Values['server']:=edit5.Text;
taal := 'NL';
//find language settings
if combobox2.ItemIndex=0 then
begin
language:= 'NL'
end;
if combobox2.ItemIndex=1 then
begin
language:= 'ENG';
end;
if language='ENG' then
begin
vertalerENG.vertaler('ENG');
end;
end;
end;
end;
end;
the VertalerENG is a function that is fired if the language parameter is ENG and change all of the captions to English.
the problem is that nothing is changed till i restart the app.

If you want restart app programmatically,
This code work fine for me and you can set time elapse before restart app
uses
Androidapi.Helpers,Androidapi.JNI.GraphicsContentViewText,Androidapi.JNI.App,
System.DateUtils;
...
procedure RestartApp;
{$IFDEF ANDROID}
var LPM : JPackageManager;
LIntent_Start : JIntent;
LPendingIntent : JPendingIntent;
LMS : Int64;
{$ENDIF}
begin
{$IFDEF ANDROID}
LPM := TAndroidHelper.Context.getPackageManager();
LIntent_Start := LPM.getLaunchIntentForPackage(
TAndroidHelper.Context.getPackageName()
);
LIntent_Start.addFlags( TJIntent.JavaClass.FLAG_ACTIVITY_CLEAR_TOP );
LPendingIntent := TJPendingIntent.JavaClass.getActivity(
TAndroidHelper.Context,
223344 {RequestCode},
LIntent_Start,
TJPendingIntent.JavaClass.FLAG_CANCEL_CURRENT
);
LMS := DateTimeToUnix( Now, False {InputIsUTC} ) * 1000;
TAndroidHelper.AlarmManager.&set(
TJAlarmManager.JavaClass.RTC,
LMS + 10000,
LPendingIntent
);
// TAndroidHelper.Activity.finish();
Application.Terminate;
{$ENDIF }
end;

If changing the language is your only concern then i would suggest changing the locale of the application. You only need to restart the activity if you're using all the strings correctly from strings.xml
You can see it here how to change the locale of application programatically.
Change app language programmatically in Android

Android Test App perform programming steps backwards

I am using Delphi Enterprise version 10.2.3 with Android SDK ver 24.3.3 32bit. I tried a very simple program with only one button. The Onclick is simply the following:
ShowMessage('1');
ShowMessage('2');
ShowMessage('3');
ShowMessage('4');
The result I got on my Samsung phone when clicking on the button is:
4
3
2
1
Of course I am expecting to get
1
2
3
4
This is not my first Android Program. The previous ones runs smoothly. But when I got strange errors on my latest program, I found that programming steps are carried out in reverse. I am also scared now to recompile the previous apps, just in case I am getting this strange behavior. So I just make a new program (above) to test, but got the same results. I also disabled the Antivirus Avast program, and even try it on another Samsung device.
Help will be very much appreciated. At this moment I am really confused and not sure what next steps to take to solve the problem. Please help me!

On mobile platforms, ShowMessage behaves asynchronously. The call finishes instantaneously, it does not wait for the user to close the dialog box.
Try this code:
function TForm1.MyShowMessage(const Msg: String): TModalResult;
var
MR: TModalResult;
begin
MR := mrNone;
TDialogService.MessageDialog(Msg, TMsgDlgType.mtConfirmation,const [TMsgDlgBtn.mbYes, TMsgDlgBtn.mbNo], TMsgDlgBtn.mbYes, 0,
procedure(const AResult: TModalResult)
begin
 MR := AResult;
end);
while MR = mrNone do begin
Application.ProcessMessages;
CheckSynchronize;
end;
Result := MR;
end;

Barcode reading Delphi xe7, event after intent not triggering

In my app, developed with XE7 for Android/iOS, I have a form for scanning barcodes. Upon a found barcode, my app validates whether it is an acceptable barcode or not. Following tutorials here: http://www.fmxexpress.com/qr-code-scanner-source-code-for-delphi-xe5-firemonkey-on-android-and-ios/
Currently I am testing on Android and I am able to integrate scanning and reading of barcodes, but the 'onBarCode' event does not fire when returned from the shared Activity of finding the barcode. Same code worked well with previous versions of Rad Studio ( XE4, XE5, XE6) but now in XE7 it does not.
Here are some snippets of code:
...
begin
Scanner := TAndroidBarcodeScanner.Create(true);
Scanner.OnBarCode := BarcodeHandler;
Scanner.Scan;
end;
procedure TmScannerForm.BarcodeHandler(Sender: TAndroidBarcodeScanner;
BarCode: String);
begin
text1.Text := Barcode;
memo1.PasteFromClipboard;
AddBarcode(BarCode, true);
end;
AddBarCode is the even I used to validate and add barcode to a list, but I didnt include it, because that code isn't the problem - it's not even triggering. The Text1.text:=Barcode and memo1.paseFromClipboard were in their for validating the even wasn't firing too. I can confirm the barcodes are being read because if I tap and manually paste, the barcode shows.
Why is this not working on XE7 as it did in previous versions of Rad Studio?

Andrea Magni has a more elegant solution than the timer on his blog based on event handling.
I would comment to send the link but I don't have enough reputation.
The link to his blog is :
http://blog.delphiedintorni.it/2014/10/leggere-e-produrre-barcode-con-delphi.html
Maybe this can help you. The blog is in Italian though but the sources are provided and are explaining by themselves.

There is a source code fragment on http://john.whitham.me.uk/xe5/ which looks useable (based on Zxing):
intent := tjintent.Create;
intent.setAction(stringtojstring('com.google.zxing.client.android.SCAN'));
sharedactivity.startActivityForResult(intent,0);
The code in the linked article also shows how to receive the Intent result. (I don't work with Delphi on Android so I am not sure if that part uses a best practice - TTKRBarCodeScanner uses a workaround with a Timer and the Clipboard).
I would try this as an alternative to see if works.

This code works to me!
Set timer enabled to true when you run your scan code
procedure Tform.Timer1Timer(Sender: TObject);
begin
if (ClipService.GetClipboard.ToString <> '') then
begin
timer1.Enabled:=false;
zSearch.Text := ClipService.GetClipboard.ToString;
//Do what you need
end;
end;

This code to me works fine!
in andorid.BarcodeScanner
function TAndroidBarcodeScanner.HandleAppEvent(AAppEvent: TApplicationEvent;
AContext: TObject): Boolean;
var
aeBecameActive : TApplicationEvent;
begin
aeBecameActive := TApplicationEvent.BecameActive;
if FMonitorClipboard and (AAppEvent = aeBecameActive) then
begin
GetBarcodeValue;
end;
end;

Empty product list on QueryProducts in Delphi XE6 TInappPurchase on Android

I am developing inapp-Purchase in Delphi XE6.
Based on embarcadero documentation I create an InAppPurchase component as below:
FInAppPurchase := TInAppPurchase.Create(self);
{$IFDEF Android}
FInAppPurchase.ProductIDs.Add(License5And);
FInAppPurchase.ProductIDs.Add(License10And);
FInAppPurchase.ProductIDs.Add(License20And);
FInAppPurchase.ProductIDs.Add(License50And);
{$ENDIF}
{$IFDEF IOS}
FInAppPurchase.ProductIDs.Add(License5);
FInAppPurchase.ProductIDs.Add(License10);
FInAppPurchase.ProductIDs.Add(License20);
FInAppPurchase.ProductIDs.Add(License50);
{$ENDIF}
FInAppPurchase.OnSetupComplete := InAppPurchase1OnSetupComplete;
FInAppPurchase.OnConsumeCompleted := InAppPurchase1ConsumeCompleted;
FInAppPurchase.OnError := InAppPurchase1Error;
FInAppPurchase.OnProductsRequestResponse := InAppPurchase1ProductsRequestResponse;
FInAppPurchase.OnPurchaseCompleted := InAppPurchase1PurchaseCompleted;
FInAppPurchase.OnRecordTransaction := InAppPurchase1RecordTransaction;
FInAppPurchase.OnVerifyPayload := InAppPurchase1VerifyPayload;
{$IFDEF Android}
FInAppPurchase.ApplicationLicenseKey := myLicenseKeyFromGoogleDeveloperConsole;
{$ENDIF}
Then in InAppPurchase1OnSetupComplete I Called the FInAppPurchase.QueryProducts then it goes into InAppPurchase1ProductsRequestResponse and products and InavlidProductIDs both are empty. I don't know what I missed. Any help will be appreciated.
I check my products in google developer console all of them are 'Active' and as Type of 'Managed'.
p.s. Code is working perfect on ios Device.

I lost a lot of time to understand the problem.
After I studied the source code I have understand that in Android the Events are asynchronous, you must wait the "QueryProducts" result.
In order to fix this problem I created a TTimer that wait 5 second before it read "InAppPurchase.IsProductPurchased"
(I'm sorry for bad English)

It seems the app should be published for alpha or beta testing.
Instead of uploading for production I need to upload it for alpha first then publish it. after that the products are shown.

I developed the interface with the market starting from the example CapitalITrivia in Enbarcadero. I had the same problem and I read the answer that was given here.
I tried it and actually works. But this solution did not satisfy me because it depends on a delay not justified.
I realized that in InAppPurchaseSetupComplete was called the QueryProducts function and then I performed IsProductPurchased.
If I move the IsProductPurchased test in InAppPurchaseProductsRequestResponse function I get the expected result without introducing the delay.

Delphi XE5 Android Httpserver segmentation fault?

I'm having this incredibly crazy error!
I drop idhttpserver,webbrowser on a new mobile android app.
I want the server to provide content to the browser.
It works great on windows but fails on my android device.
I tested a tcpserver and tcpclient. I can get the client to connect, but when I start
writeln and readln I get segmentation fault.
Even if I run with debugging off the application still crashes... here is the code snippet.
procedure TForm37.Button1Click(Sender: TObject);
begin
IdHTTPServer1.Bindings.Add;
try
IdHTTPServer1.Active := true;
if IdHTTPServer1.Active then
Button1.Text := 'Server Started';
except on E: Exception do
Button1.Text := 'Server Failed';
end;
end;
procedure TForm37.Button2Click(Sender: TObject);
var
astring : string;
begin
try
astring := IdHTTP1.Get('http://10.0.1.78:6000/');
// or astring := IdHTTP1.Get('http://127.0.0.1:6000/');
ShowMessage(astring);
except on E: Exception do
Button2.Text := 'connection failed';
end;
end;
procedure TForm37.IdHTTPServer1CommandGet(AContext: TIdContext;
ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
begin
AResponseInfo.ContentText :=
'<html><head><title>My First Response</title></head>' +
'<body>Command: ' + ARequestInfo.Command +
'<br />Host: ' + ARequestInfo.Host +
'<br />URI: ' + ARequestInfo.URI +
'<br />UserAgent: ' + ARequestInfo.UserAgent +
'</body></html>';
end;

This answer is sure to be very unpopular.
I too am trying to develop an FM HD Android Datasnap application using XE5 and I am getting Segementation Fault (11) at every turn! It's completely unpredictable.
Compiling as a Win32 target produces no errors.
For example:
A button's event handler will execute and complete successfully the first time the button is clicked and then on a second click it will produce a segmentation fault for no apparent reason.
My application almost does nothing useful at this point, but it's taken me hours and hours of trial an error to get it to do what it does.
I personally don't think that Android development in Delphi XE5 is actually viable unless you happen to be someone who already develops Android apps using the other dev. environments and/or you've got nothing better to do all day than fight with it.