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Programming

How to Fix Blank Screen on WordPress Add/Edit Post Page

January 21, 2021 by Lorensius Londa Leave a Comment

I just updated my Wordpress blog to version 5.6 and suddenly i got blank page while trying to add new post. I had no problem accessing another dashboard menus except the post page. So i tried googling it and found some suggestions like disabling all plugins and tried to downgrade the wordpress … [Read more...] about How to Fix Blank Screen on WordPress Add/Edit Post Page

How to Programmatically Restart the ESP32 Board

June 6, 2019 by Lorensius Londa Leave a Comment

ESP32 development board is one of the popular board across the  IOT developer community. It is because the board itself packed with two built-in communication features, Wifi and Bluetooth (BLE). When programming a controller, sometimes we need to add the restart feature that let the user manually … [Read more...] about How to Programmatically Restart the ESP32 Board

How to Get Hardware Info of ESP32

June 6, 2019 by Lorensius Londa Leave a Comment

With the increasing popular of IOT technologies, there are also available development boards from many manufacturers. One of popular board is ESP32 which comes with integrated wifi and bluetooth (BLE) capability. We can use Arduino framework to program the board either using Arduino IDE or other IDE … [Read more...] about How to Get Hardware Info of ESP32

Eclipse Issue on Os X Yosemite – To open “Eclipse” you need to install the legacy Java SE 6 runtime

April 24, 2015 by Lorensius Londa Leave a Comment

Recently i just upgraded my Macbook Pro to the new Macbook Retina Display (mid 2014) that comes default with OS X Yosemite 10.10.1. After installing Java JDK 1.8, all my Android IDE (Eclipse and Android Studio) work well so i can continue my development as usual. The problem comes when i update the … [Read more...] about Eclipse Issue on Os X Yosemite – To open “Eclipse” you need to install the legacy Java SE 6 runtime

Blue Bamboo P25 Printer Android Demo Application With Source Code

February 28, 2014 by Lorensius Londa 22 Comments

Blue Bamboo P25 printer is a lightweight and portable thermal printer that provides low cost printing in mobile and wireless environments. It supports mobile application printing over Bluetooth, USB or Serial port (RS-232). It also has a good connectivity with Android device, makes printing from … [Read more...] about Blue Bamboo P25 Printer Android Demo Application With Source Code

How to Programmatically Pair or Unpair Android Bluetooth Device

February 20, 2014 by Lorensius Londa 24 Comments

In bluetooth wireless communication, if two devices want to connect and share data, they have to be paired first. To be paired means the two devices are aware of each other's existence and trusted each other.  Using Android Bluetooth API, we can use createBond method to pair with a device … [Read more...] about How to Programmatically Pair or Unpair Android Bluetooth Device

How to Programmatically Scan or Discover Android Bluetooth Devices

February 20, 2014 by Lorensius Londa 14 Comments

Through Android Bluetooth API, developers can access most of bluetooth functionalities and let the applications wirelessly connect to bluetooth devices. Before connecting to a device, an application must discover or scan available bluetooth devices, request pairing and connect to the device.   … [Read more...] about How to Programmatically Scan or Discover Android Bluetooth Devices

How to Make Android ListView or GridView Expandable inside ScrollView

February 17, 2014 by Lorensius Londa 14 Comments

We all know that placing a ListView or GridView inside ScrollView will make them becoming difficult to scroll and can not be expanded. Android doesn't provide a built in API to handle this problem so we have to do a little hack by subclassing those two views. This is hack i found on … [Read more...] about How to Make Android ListView or GridView Expandable inside ScrollView

How to Convert Time in Milliseconds into Relative Time Format in Android

February 14, 2014 by Lorensius Londa 2 Comments

Relative time format like "moments ago" or "5 minutes ago" or "one month ago" like those in Facebook, Twitter or other social media makes the time information easy to read and human readable. In Android we can use built in API DateUtils or external java library Prettytime to implement this … [Read more...] about How to Convert Time in Milliseconds into Relative Time Format in Android

Solution to Make an Android App Visible to All Devices in Google Play When Using Specific Feature

February 11, 2014 by Lorensius Londa Leave a Comment

As we know, Google Play filters android applications that are visible to user by comparing features that required by the application with the features available on the device. Android requires specific tags to be declared on manifest file when using a  specific feature. Commonly use tags are … [Read more...] about Solution to Make an Android App Visible to All Devices in Google Play When Using Specific Feature

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How to Setup MQTT Server Using Mosquitto and Libwebsocket on Freebsd

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