Tag: development

Android / Java: Get the name of method being executed

If you want to trace the name of the method that’s being executed, the Java code snippet in this page might help you.

This is especially handy when you are debugging by tracking every method that is executed. You can enclose these lines of codes in a function that you call in every method — that’s easier than typing the name for each method you’re tracking, right? 🙂

The String variable methodName will contain the name of the method where you place the following lines of code:

Java

String methodName = new Object(){}.getClass().getEnclosingMethod().getName(); Log.d(“Executed Method”, methodName);

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String methodName = new Object(){}.getClass().getEnclosingMethod().getName();
Log.d(“Executed Method”, methodName);

January 26, 2016
Get started: Android Studio app development on Windows 7 (Tested on LG G3 phone)
You can still follow this tutorial if you’re using another version of Windows or if you’re using another Android device. You don’t strictly have to use a Windows 7 computer and an LG G3 phone. 🙂

Being a web developer and a frequent user of Android devices, I’ve always been curious about Android app development. I’m really happy that I’m finally able to create even the simplest Android app (i.e., displaying Hello World! lol) 😆

You are on this page most likely because you are just curious like me, or because you need to learn Android app development for school or work.

My development environment as I wrote this tutorial:
- 3-year-old ASUS laptop, 32-bit system, 4 GB RAM, Intel Core i5-2410M, 2.36GHz processor (Android Studio is slowing this laptop down significantly)
- Windows 7 (you can use any other Windows version to follow this tutorial)
- Android Studio 1.4
- LG G3 as test device (you can use a different phone, of course)
How to say “Hello World!” on your first Android app
1. Install JDK (Java SE Development Kit)
  
  Download it from this page: JDK (Java SE Development Kit)
  
  Make sure to check if you are using 32-bit or 64-bit Windows and download the appropriate installer version. The installers for 32-bit and 64-bit Windows are not interchangeable. In my office laptop I installed jdk-7u79-windows-x64.exe but since it is for 64 bit and incompatible with my 32-bit Windows at home, I downloaded jdk-7u79-windows-i586.exe from the source.
2. Install Android Studio.
  
  When someone in your team, or when you download Android Studio completely for the first time, copy the sdk folder from this path and store it somewhere for future use:
  
  C:\Users\YourUsername\AppData\Local\Android\Sdk
  
  Please note that this can take a while. It took me about 30 minutes to finish copying in an old laptop that uses Intel Core i5 CPU.
  
  The installation of Android Studio requires Internet connection for the contents of the sdk folder, and it will be trouble if you have a very slow connection to the Internet. It will be handy to keep a copy of the sdk folder as backup, so that every time you need to install Android Studio, you just have to “cancel” the download that doesn’t seem to end (when it says Downloading Android SDK Build-tools) and just paste the contents of your backup sdk folder into the folder where you are currently installing SDK into D:\Users\YourUsername\AppData\Local\Android\sdk. When you try to start a new project, you might run into an error saying “Your Android SDK is missing, out of date, or is missing templates.” To fix this, do the following:
  1. Click OK to close the dialog then click Configure.
  2. Click SDK Manager.
  3. Find the field where you can Edit the path for your Android Studio SDK — click on “Edit”.
  4. You probably see this message in red: “An existing Android SDK was detected. The setup wizard will only download missing or outdated SDK components.” Just keep on clicking Next until you can see a Finish button
3. Now, you can start a new Android project in Android Studio!
  1. Press the back button and find the “Start a new Android Studio project” button.
  2. Set your Application Name and Company Domain. Change Project Location if desired. These are up to you.
  3. Click next.
  4. Click next again, leaving only Phone and Tablet as our platform.
  5. Select “Empty Activity” then click next.
  6. Change “Activity Name” and “Layout Name” if desired (I leave them as is), then click Finish button. (It is taking ages for my project to load after creation. Ugh! :lol:)
  7. If Android Studio hasn’t opened MainActivity.java and activity_main.xml for you, then follow these steps:
    
    On the left side of the screen, click Project, then in the directory tree, navigate to app -> res-> layout then double click activity_main.xml to open it.
    
    Make sure you are on the “Design” tab (at the bottom part there should be 2 tabs: Design and Text. Click Design.) This will show you a preview of the app that says Hello World!
  If you see the “Hello World”, good! I would congratulate you, but if you’re like me, you probably didn’t feel any accomplishment in seeing that Hello World in your computer screen. After all, an Android app is supposed to be run in an Android device. You can stop here, or you can read the next steps as I guide you in setting up your computer, Android Studio, and Android device so that you can run the app you are developing in your phone or tablet.
4. Prepare your Android device for running your app.
  
  Allow me to use the words “phone” and “device” interchangeably — just a little warning to keep you from being confused. 😆 After all, the “device” I’m using for this tutorial is a “phone” 🙂
  
  Install PdaNetfor USB debugging of your phone (ADB driver):
  
  Source: PdaNet download page
  1. Download PdaNet installer here. Just follow the instructions from the installer during the process. You need to finish this so that Android Studio can run apps on your phone.
  2. Let me tell you how I successfully let my Android Studio run apps on my LG G3 phone…
    
    While PdaNet was installing, I closed Android Studio (it consumes a huge portion of memory in mine) during the process, hoping my computer runs the pdanet installation a little faster.
    
    I installed PdaNet from Google Play Store into my phone, as instructed by the PdaNet installer on my computer.
    
    After PdaNet was installed to my phone, I opened it and enabled the “Activate USB Tether” option.
    
    When I run Android Studio again, with my MainActivity.java and activity_main.xml still open, I pressed Shift + F10 to attempt to run the app on my phone.
    
    Yes, my LG G3 was listed as a connected device but Android Studio says that my device is offline.
    To fix the “device is offline” problem, what I did was unplug my phone from the computer and then plug it back in. On my phone, there was a prompt to “Allow USB Debugging” and I allowed it. Then, pressing Shift + F10 again on Android Studio allowed me to choose my LG G3 phone. When I pressed OK, the Hello World! screen was displayed on my LG G3. 🙂
  Your device is still not able to run your app from Android Studio? Try any of these:
  
  Possible fix #1: Set connection mode on your phone from MTP to PTP
  
  You probably read earlier that unplugging and plugging my device back into my computer let Android Studio detect my LG G3 as an online device. I realized that my connection was already set to PTP back then.
  
  I tried switching to MTP and as a result, Android Studio took out my device from the list.
  
  I switched back into PTP mode and Android Studio brought my device back to the list.
  
  So, that confirmed that LG G3 needs to connect to the computer in PTP mode so that Android Studio can run apps in it.
  
  Possible fix #2: Install LG program/driver(s)
  1. When you plug your device into the computer, you’ll see something like “Connected as Media Device (MTP)”.
  2. Go to your notifications panel and click on such notification.
  3. A popup will appear: “Install PC programs required when connected to computer. -If you have installed on your computer, skip by checking Don’t show this again.” Then if you click OK, you’ll see “Installing PC programs. Please check your PC.”
  4. On your computer you’ll see AutoPlay dialog, click on Run_LG_PC_Programs.exe.
  5. Now on your computer you’ll see “LG USB driver for LG phone is being installed”. KEEP THE DEVICE CONNECTED TO YOUR COMPUTER DURING THIS PROCESS!
  6. When done, you’ll see a message in the computer: “The drivers for LG phone are now installed. You can connect your PC and phone.”
  7. Click OK.
  (If you’re using an LG phone and if this doesn’t work try to install LG drivers from this link too …I had to download that one for my phone to work on my office laptop’s Android Studio. )
Other notes

Each time you run the app, an APK file is generated in app/folder/app/build/outputs/apk/

Thanks, acknowledgement, sources…

Thanks to my office friends Nethki, Allen, and Peng for ideas and guidance, as well as to my boyfriend. 🙂 I probably couldn’t have started anything at all without you all. 😀
January 5, 2016
How to change app name in Android Studio

I’m trying to learn how to build a simple app in Android just to satisfy my curiosity. This will also be a very handy skill because I use Android phones often, and there are times that the apps I download from Google Play Store lack features that I need.

This will be a very simple guide on how to change app name in Android Studio, something that most beginners in Android development probably want to know.

It is assumed in this guide that you have prior knowledge in coding.

The app name that I’m referring to is the one that says “My Application”, as marked on the image below:

To change that, go to your Project and find the app folder. Under app, find AndroidManifest.xml and edit android:label="My Application", replacing “My Application” with the name you’d like to use.

Refer to the image below:

Your changed app name should be reflected in the live preview now, if you have it activated. If you don’t have live preview yet, check this out: Where is Android Studio layout preview?

Updates…

How to rename project folders of Android Studio

You may also want to change the name of your Android app’s folder. Check this folder, it’s probably where your Android project folder is located — C:\Users\catkeng\AndroidStudioProjects\

How to rename package in Android Studio

Right-click on your package name in the Project tree. It’s probably under app->java. Then choose “Refactor”, then choose “Rename”. Take note that you’ll see “Rename package” and “Rename folders” button here — you might need to go back to this screen later to click “Rename folders”. For now, click the “Rename package” button. Type the new name that you want to use, then click “Refactor”. If that hasn’t changed all package name instances for you, follow the same steps until you can click “Rename folders” button too. That should do it!

November 9, 2015
Facebook App Development tips, guides, and possible solution to issues

In July 2013, I began learning about developing apps that run in Facebook. For a web developer especially one who works in a marketing agency, learning about Facebook app development is important nowadays because numerous amounts of campaigns are ran on Facebook.

At first Facebook app development confused me, but after some exposure to it and some help from colleagues who have been doing it for years, I got the feel of it.

Following are some blog entries on my Code Playground that are related to Facebook app development. (more…)

September 16, 2013
SMTP: Test emails from local computer during development stage using smtp4dev

Web developers need to work on their website locally once in a while. I use XAMPP in my computer to work on my web projects locally.

I’m about to begin working on a project which sends emails when users register for an account. From the live site, I downloaded it to my computer so I could do updates. I tested the registration form and it failed because email could not be sent. I would usually use phpmailer, but that’s a bit time-consuming to configure, so I wondered if my colleague who worked on it before used a simpler solution. Lucky me, she did find a simpler way to test the emails sent/received on her computer during development.
(more…)

April 25, 2013