Android Question After running about 3 hours black screen occurs

[Baris Karadeniz]

When my app runs at the background, about 3 hours later, if I want to open it black screen comes into the front of the screen. What can be the problem?

 

[lemonisdead]

What can be the problem?

Hard to say without seeing any code. But most probably an incorrect use of loading the layout in Activity_Create ?

 

[Baris Karadeniz]

Here are the codes. There are several panels in the layout. But only Main is visible at the activity layout.

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")
   
    Activity.LoadLayout("Main")
    p.SetScreenOrientation(1)
   
    locale.Initialize
    Timer1.Initialize("Timer1", 5000)
    PanelMain.Visible = True
    PanelLanguage.Visible = False
    PanelStatus.Visible = False
    PanelMap.Visible = False
    PanelCamera.Visible = False
    PanelDrvUserManual.Visible = False
    PanelMessage.Visible = False
   
    BtnSystemOnOff.TextOn = "System On/Off"
    BtnSystemOnOff.TextOff = "System On/Off"
    BtnOccUnocc.TextOn = "Occupied/Unoccupied"
    BtnOccUnocc.TextOff = "Occupied/Unoccupied"
    BtnMap.Text = "Map"
    BtnStatus.Text = "Status"
    BtnMessage.Text = "Message"
    BtnCamera.Text = "Camera"
    BtnDrvUserManual.Text = "User manual"
    BtnSOS.Text = "SOS"
    BtnLanguage.Text = "Language"
   
    lblGPSname.Text = "Location Service"
    lblLatitudeName.Text = "Latitude"
    lblLongitudeName.Text = "Longitude"
    lblAltitudeName.Text = "Altitude"
    lblHeadingName.Text = "Heading"
    lblSpeedName.Text = "Speed"
    lblAccuracyName.Text = "Accuracy"
    lblTimeName.Text = "Time"
    lblimeiName.Text = "IMEI"
    AlertMessage = "You have a new message."
    warningtitle1 = "ATTENTION"
    warning1 = "Please press on the User manual button to adjust settings."
    warning2 = "Please enter 15 digits IMEI number."
    PhotoSend = "Photo is uploaded."
    lblgpstextenable = "Enabled"
    lblgpstextdisable = "Please enable location services"
    TextFieldimei.Hint = "Please write your IMEI number here."
    lblSatellites.Text = "Satellites"
    btnFocus.Text = "Take photo"
   
    GetPreferredLanguage
   
    If File.Exists(File.DirInternal,"user") Then
            TextFieldimei.Text = File.ReadMap(File.DirInternal,"user").Get("userimei")
            imeiService = TextFieldimei.Text
        Else
            TextFieldimei.Text = ""
            imeiService = TextFieldimei.Text
    End If
   
    Event = ""
    occupied = "chat=1|cost=0|occupied=0|batp=100|bats=1|"
   
    EventService = Event
    occupiedService = occupied
   
    DateTime.DateFormat= "yyyy-MM-dd HH:mm:ss"
   
    BtnSystemOnOff.Color = Colors.Red
    BtnOccUnocc.Color = Colors.Red
   
    Dim WebViewSettingsMap As WebViewSettings
    WebViewSettingsMap.setDefaultZoom(WebViewMap, "FAR")
    WebViewSettingsMap.setLoadWithOverviewMode(WebViewMap, True)
    WebViewSettingsMap.setUseWideViewPort(WebViewMap, True)
    WebViewSettingsMap.setDisplayZoomControls(WebViewMap, False)
    webviewextrasMap.addWebChromeClient(WebViewMap,"webviewextrasMap")
   
    Dim WebViewSettingsDrvUserManual As WebViewSettings
    WebViewSettingsDrvUserManual.setDefaultZoom(WebViewDrvUserManual, "FAR")
    WebViewSettingsDrvUserManual.setLoadWithOverviewMode(WebViewDrvUserManual, True)
    WebViewSettingsDrvUserManual.setUseWideViewPort(WebViewDrvUserManual, True)
    WebViewSettingsDrvUserManual.setDisplayZoomControls(WebViewDrvUserManual, False)
   
    Dim WebViewSettingsMessage As WebViewSettings
    WebViewSettingsMessage.setDefaultZoom(WebViewMessage, "FAR")
    WebViewSettingsMessage.setLoadWithOverviewMode(WebViewMessage, True)
    WebViewSettingsMessage.setUseWideViewPort(WebViewMessage, True)
    WebViewSettingsMessage.setDisplayZoomControls(WebViewMessage, False)
   
    ime1.Initialize("ime1")
    ime1.AddHeightChangedEvent
    Dim jo As JavaObject = Activity
    jo.RunMethodJO("getContext", Null).RunMethodJO("getWindow", Null).RunMethod("setSoftInputMode", _
    Array As Object(0x20))
    ActivityParent = jo.RunMethodJO("getParent", Null)
   
    ime2.Initialize("ime2")
   
    BtnSystemOnOff.Checked = False
    BtnOccUnocc.Checked = False
    systemon = False
   
    Timer1.Enabled=True
   
End Sub

 

[Baris Karadeniz]

There is no problem at the first load. I think there is a problem at the Resume. Because it happens about 3 hours later. And there is nothing at the resume.

Sub Activity_Resume
    AfterChange
End Sub

 

[Erel]

You can test the "resume flow" by clicking on the home button and then on the app icon again.

Make sure to go over this tutorial: https://www.b4x.com/android/forum/threads/6487/#content

 

[Baris Karadeniz]

It works normally. Many times no problem. Black screen happens after about 3 hours when it is at the background I click on the app icon.

 

[Baris Karadeniz]

Can it be because of android kills the app after some time?

 

[Erel]

Android will kill the app for sure. However if your program is built correctly then it should start properly when the process is restarted.

 

[Baris Karadeniz]

My app works normally. Resume works fine too. My app has communication with the server at the background too. What should I check?

 

[Erel]

You haven't provided any relevant information so we cannot really help. The first step is to post the logs.

You need to go over the tutorial that I previously posted.
This one is also important: https://www.b4x.com/android/forum/t...-consistent-single-entry-point.57599/#content

I guess that you ran your app in release mode, right? In debug mode it will only work when the debugger is connected.

 

[Baris Karadeniz]

I ran my app debug mode and release mode. It is already uploaded to the Google Play and downloadable. App name is TAKSİ'M Driver. I downloaded from Google play and ran. Can you please try also?

 

[Baris Karadeniz]

There is also starter service in my app. If you want, I can send app as a zip to you.

 

[Baris Karadeniz]

I have installed it and currently run it.
PS: they are a lot of buttons where the text is not readable on Oukitel K10000

Can you please send screenshot of the view where there are not readable buttons?

 

[Baris Karadeniz]

What is your screen size?

 

[Baris Karadeniz]

I use Note II. It is also 5,5 Inch and 720x1080 and everything is ok. Interesting. What can be the reason?

http://www.gsmarena.com/samsung_galaxy_note_ii_n7100-4854.php

 

[Baris Karadeniz]

Screenshot is given attached.

 

[Baris Karadeniz]

Ok. I will look to screen density. I didn't receive logs via Google Play yet. Can you please send here?

 

[Baris Karadeniz]

It says java.lang.NumberFormatException. Information is at given attached pictures. What do you advice? It says that device is hct6735m_35gu_l1. But your device is Oukitel.

 

[Baris Karadeniz]

So, it is not related with app if it is related with your internet access? And what happened when it is crashed? App is closed? If app is closed did you try to open again?

 

[Baris Karadeniz]

If are at the camera screen and pause the app and resume again black screen comes but if you press on the back and come again to camera it is ok. It is related with camera I know but I couldn't solve.

But You said that it happened after you took a picture. It is interesting. I will look to the developers console and inform you.