Android
SDK
http://developer.android.com/sdk/index.html#ExistingIDE
Redhat
At the step of Running your app I cannot run app from Eclipse. The command line way does not work.After several tries, it seems the RHEL does not have an updated Ant package (currently it is 1.7 but I need 1.8). Give up.
Ubuntu
Download the bundle version. The file name I got is <adt-bundle-linux-x86_64-20140321.zip>.
On 64-bit Ubuntu, we need to run
sudo apt-get install libstdc++6:i386 lib32z1 lib32ncurses5 lib32bz2-1.0
For both 32-bit and 64-bit, we need to get openjdk
sudo apt-get install openjdk-6-jre openjdk-6-jdk icedtea6-plugin
Then uncompress <adt-bundle-linux-xxx.zip> and run the file <eclipse> from either file manager or command line. It just works!
We can furthermore set up the PATH variable by editing ~/.bashrc file.
export PATH=$PATH:~/binary/adt-bundle-linux-x86_64-20140321/sdk/platform-tools/ export PATH=$PATH:~/binary/adt-bundle-linux-x86_64-20140321/sdk/tools/ export PATH=$PATH:~/binary/android-ndk-r9d/
Then source the file by
source ~/.bashrc
A good reference is https://help.ubuntu.com/community/AndroidSDK.
To quickly test NDK, go to the samples/hello-jni directory in NDK. Type the command ndk-build. If the build is successful, it proves that the NDK environment is set up correctly.
Android Studio
After downloading & installing Android Studio, we run the following command to launch it (the first time installation will pop up the 1st screenshot). See <android-studio/install-Linux-tar.txt> file.
$ ~/Downloads/android-studio/bin/studio.sh
The adb utility's location is located uner ~/Android/Sdk/platform-tools (see the 4th screenshot).
Another way is install is to use 'snap'; see https://snapcraft.io/android-studio
Windows
Emulation on x86
- The best programs to run Android apps on your Windows PC (Oct 19, 2016)
Anbox
How to Run Android Apps and Games on Linux
No emulation layer like QEMU is necessary.
Android-x86
This isn’t an emulator that lets you run Android within Windows or another operating system.
Android Studio
- How to Setup Android Emulator using Android Studio
- Install the emulator, Android virtual devices and Run an app on the Android emulator from the Android Studio
- Android Studio: /dev/kvm device permission denied
sudo adduser yourname kvm
Log out and back in for the permissions to take effect.
- Android Studio: /dev/kvm device permission denied
- How to install an apk on the emulator in Android Studio?
Remix
https://www.reddit.com/r/RemixOS/comments/40ahkc/is_it_possible_to_run_remix_os_on_virtualbox_if/
Slowww.
Phoenix
- https://liliputing.com/2017/03/phoenix-os-2-0-alpha-released-android-7-1-dekstop-os.html
- https://liliputing.com/2017/07/remix-os-fades-away-phoenix-os-keeps-android-desktop-os-alive-v2-1-0-release.html
BlueStacks
Runs on Windows and Mac. Free.
AMIDuOS
$10 to keep. Work on Windows not Linux. Virtual Machine. Read this article from PCWorld.
Genymotion
Genymotion is a complete set of tools that provides a virtual environment for Android. Genymotion is much better than the ADV included in Android SDK. Before we use download/use it, we need to register.
For some reason, on my Ubuntu 12.04, I need to run the following.
sudo apt-get install ia32-libs
The genymotion can be integrated into Eclipse. The document about genymotion can be found on https://cloud.genymotion.com/page/doc/
Lineage
How to Install LineageOS on Android
Qt + Android
Installation
- http://qt-project.org/doc/qt-5/android-support.html
- http://qt-project.org/doc/qtcreator-3.0/creator-developing-android.html for the Qt creator configuration for Android development
- http://blog.colundrum.eu/post/77718565757/how-to-qt5-2-1-for-android-xubuntu-64-bit-14-04-lts-deve
- http://blog.qt.digia.com/blog/2014/03/26/qt-weekly-3-qt-for-android-tips-and-tricks/?utm_source=rss&utm_medium=rss&utm_campaign=qt-weekly-3-qt-for-android-tips-and-tricks
- https://blog.qt.digia.com/blog/2013/07/23/anatomy-of-a-qt-5-for-android-application/
- KDAB episode1 episode2 episode3
- http://gennon.wordpress.com/2013/06/23/deploy-qt-to-android/ Windows OS setup
- http://www.jjoe64.com/2014/03/tutorial-qt-for-android-set-up-sdk-and.html Linux OS setup
We can install requirements of Qt 5 by
- SDK -> No need to download a special copy. Just use adt-bundle-linux-x86-2013xxxx one.
- Apache Ant -> sudo apt-get install ant
- NDK -> android-ndk-r9c-linux-x86.tar.bz2. Use tar -xjvf android-ndk-r9c-linux-x86.tar.bz2 to extract.
- Download qt-linux-opensource-5.2.0-android-x86-offline.run and install it into a new location, eg ~/Qt5.2.0Android (Cannot be the same as Desktop version).
- On a new machine, we need to install opengl library as instructed here and here.
sudo apt-get install mesa-common-dev sudo apt-get install libglu1-mesa-dev -y
The Qt needs to change the setting from Tools > Options > Android where we can specify the locations of Android SDK, Android NDK, Ant and JDK. On Tools > Options > Devices, we can change the Device from default (Local PC) to Run on Android. See the instruction on qt.project.org. Basically we go to project's setting to do changes. It does take a little longer to get the app on device.
Test Installation
We use qt-opensource-linux-x64-android-5.2.1.run to install Qt to ~/qt-5.2.1-Android directory. Note that this installer includes Qt Creator which has preset options. So this is preferred than our other separated installed Qt Creator.
We shall also need to follow episode 3 to set up SDK, NDK, JDK and Ant directories in Qt Creator.
After that, we can create a default Qt Quick application. Before we Run Debugging, we shall also
- Change project's setting to make sure Android for armeabi-v7a Kit is added to the project.
- Connect a physical Android device to our computer.
If everything goes well, the Qt app will be deployed to the connected Android device.
If we want to specify the API level, we can select Project > Run > Details > Deploy configurations. See http://qt-project.org/doc/qtcreator-3.0/creator-deploying-android.html
More QML examples can be found in http://qt-project.org/doc/qt-4.7/qdeclarativeexamples.html
Two official Android examples (Quick Forecast & Flyingbus)can be found at https://blog.qt.digia.com/blog/2013/12/10/cross-platform-applications-in-ios-and-android-stores-with-qt/
Help, Applications
- Qt Quick 2. Quick Forecast with Source code
- Tutorial from qt-project.org using Qt Creator 2.8.
- http://doc-snapshot.qt-project.org/qdoc/android-support.html
- http://blog.qt.digia.com/blog/2013/07/23/anatomy-of-a-qt-5-for-android-application/
- http://blog.qt.digia.com/blog/category/android/
NDK
Following are steps to create Android App with NDK.
- Create a new folder: jni
- Create a new file under jni: <hello.c>
- Create a new file under jni: <Android.mk>
- Open a shell & go to jni folder. Type ndk-build to generate .so files
- Edit <MainActivity.java>
- Run as Android Application.
The "hello-jni" is the hello world example. Chapter 1 in Android NDK Cookbook is the same example with simpler code.
Books/Tutorials
http://www.cprogramming.com/android/android_getting_started.html
How to connect your android device on Linux
https://www.howtoforge.com/tutorial/how-to-connect-your-android-device-on-linux/
Online resource
Android Programming: The Big Nerd Ranch Guide
It seems the solution files still have bugs. For example in Chapter 1 "01_FirstApp", the <layout/activity_quiz.xml> file should have
android:text="@string/question_text_view"
instead of
android:id="@+id/question_text_view"
within <TextView> tag.
- Android Cookbook. Source code on github.
<AndroidProgramming.zip>
Beginning Android 4 Application Development
<Source_code_download_for_Beginning_Android_4_AD.zip>
Android Tutorials
- Android Development for Beginners and Developing Android Apps from Udacity. The web-based Android (XML) visualizer on http://labs.udacity.com/android-visualizer/#/android/ is cool. The for-beginner course teaches in a fun, animated & slow pace. In lesson 1, it teaches UI development, like XML, TextView, ImageView & Layout.
- javacodegeeks.com
- mkyong.com
- TheNewBoston and another author's website
Java Books
- Head First Object-Oriented Analysis and Design
- Head First Design Patterns
Material Design
Blogs
Useful Apps
Home screens/Launcher
How to Get Started with Android’s Home Screens
Syncthing: sync without cloud services
- http://pcworld.com/article/3195024/linux/sync-your-files-for-free-and-maintain-privacy-using-open-source-syncthing.html
- https://docs.syncthing.net/intro/getting-started.html
- https://opensource.com/article/18/9/take-control-your-data-syncthing
Sign on a pdf
Games
- 20 classic games you can play on your Android phone
- 10 games to bring on your next trip
- The best Android games for your Chromebook
- 11 Apps to Kill Boredom While Upgrading Yourself at the Same Time
- Bitcoin Flip (web, iOS, Android)
Hidden Game
Go to Settings > About phone, then tap the Android version repeatedly until a stylized "N" logo appears. Press the N icon repeatedly and a game of Flappy Android will eventually appear.
http://www.howtogeek.com/269207/how-to-enable-android-nougats-cat-collecting-easter-egg/
Game for your brain
Exercise Your Brain With These 7 Free Mobile Games
Choose Your Puzzle! These Mobile Collections Offer a Wide Variety
http://www.makeuseof.com/tag/puzzle-mobile-collections/
Files Go
Files Go is a new storage manager that helps you free up space on your phone, find files faster, and share them easily offline with others. It is like Apple's AirDrop; share your pictures, videos, documents, or apps with others nearby who also have the app. With speeds up to 125 Mbps
ES File Explorer
- Send Files or Folders to Other Android Device
- Browse and Manage Photos from a Remote Album
- Browse and Transfer Your Files via LAN and SFTP (Network > Remote Manager)
- Access your Computer from Android over WiFi (Network > LAN > Scan)
- Browse the Files Stored on Your Android Device From the Computer
- Save Files Directly to Various Cloud Services
- SD card analyst - see the total disk capacity, the shared capacity, and the free space
- Remove Pre-installed System Apps
- Manage or Uninstall Multiple Apps at Once
- Extract the content of any Android App
References:
- http://www.howtogeek.com/221582/19-things-you-didnt-know-androids-es-file-explorer-can-do/
- http://receivetipstricks.com/es-file-explorer-tips-tricks/
Airdroid
SuperBeam
Browser
- Brave Browser for Android now plays YouTube videos in the background
- The 7 Best Lightweight Android Browsers for Speedy Performance Sep 2018
Camera
Camera ZOOM FX: Fastest camera, Killer speed burst mode!, Voice Activated, ...
How to Transfer Photos from Android to Your Windows PC
https://www.howtogeek.com/346317/how-to-transfer-photos-from-android-to-your-windows-pc/
Transfer files
AirDroid
Portal
How to Quickly Transfer Files from a Computer to Your Phone with Portal PC goes to http://portal.pushbullet.com/. It'll create a QR code for phone to scan and then connect to the PC.
ES File Explorer
vFTP. It lets you to transfer files to PC.
swiftp
How to Transfer Files Between Your PC and Android Phone Wirelessly
SuperBeam
https://superbe.am/. There will be a URL for the android device to download the files.
Pushbullet
Dropbox
Google Go
Lightweight Google for slow connections.
Google Search Lite becomes Google Go
Google Now/Google Feed
How to Customize the Google Feed (and Make It Actually Useful)
Google Photos
Google lens
6 Uses for Google Lens, Now Integrated Into Google Photos
Take Photo And Selfie On Your Mobile With Voice Control
https://techblogup.com/take-picture-selfie-mobile-voice-control/
Creating a Digital Photo Collage
https://www.howtogeek.com/368860/how-to-make-a-digital-photo-collage/
Google Art and Culture
https://play.google.com/store/apps/details?id=com.google.android.apps.cultural
Prey
Getting your laptop or your phone stolen sucks, but there is something you can do about it. Prey is a lightweight theft protection software that lets you keep an eye over them whether in town or abroad, and helps you recover them if ever lost or stolen. It is available on Windows, Mac, Linux and Android.
Calcu
Calculator
OpenSignal
With OpenSignal you can map cellular coverage, find Wi-Fi hotspots, test and improve your reception & get faster data.
Podcast
- 7 Key Tips for Listening to Podcasts Using Stitcher
- Science News That Laymen Understand: 5 Jargon-Free Sites and Blogs
Look up anything
https://www.makeuseof.com/tag/reference-apps/
News
- Goole News
- Microsoft News
- Apple News
Backup/restore
Helium and play store. However, Helium's wiki says it does not back up photos or videos.
Another way is to use Ubuntu's Nautilus. On my Ubuntu 12.04, I need to install gvfs. See http://robert.penz.name/658/howto-access-mtp-devices-via-usb-on-ubuntu-12-04/. We need to reboot Ubuntu 12.04 for this to take effect.
sudo apt-get install gvfs
Google maps
10 Lesser-Known Features in Google Maps for Android
Offline maps
My experience:
- Entering destination is limited. It provides a database and users can only select from it. Users cannot pick any place on the map and navigate to there. It does provide POI, Coordinates, online search options. The on-screen keyboard in online search option does not have space button???
- Don't know how to change the scale from kilometer to miles.
MAPS.ME
- 10m downloads
- openstreetmap.org maps, highly detailed, Up-to-date map data is added daily.
- routing including walking directions.
- bookmark, KML/KMZ supported
- offline search
- Auto-follow mode. When enabled, the map automatically orients itself to the direction you are moving.
- One of the fastest offline maps ever.
- Maps are updated regularly
- no voice
- no 3D
Remember to go to settings and turn off sharing data statistic with the author.
My experience:
- the road name cannot be changed even I zoom in.
- it is easy to bookmark a location. Just tap a location on the map.
- the map is well annotated though it is just 2D.
- the setting options are limited: measurement units, send statistics, zoom buttons and google play services to get the current location.
- you can search by food, hotel, transport, gas, parking, shop, ....
- TomTom Maps
- voice navigation
- 3D mode
- Free map updates & Free POI database updates
- Spoken Street Names to focus on the road
- With options for routing (avoid toll road, highways, ...)
- The interface and feeling is the same as a standalone GPS
- show house number
- Road direction (one way or two ways)
- 10 million downloads
- 7 days of premium. See the different price at sygic.com.
- Road name font is too small, no setting to change
- Not that intuitive in terms of the interface
- OpenStreetMap data, maps are updated every month.
- Voice guidance (a little bit inaccurate)
- Routing
- Can do search offline (by address or POI or browsing POI), or through google (online connection)
- Night mode color is too brownish (change the setting is possible but too tedious)
- even higher review than GPS Navigation & Maps Sygic?
The app is called 'Navigator' on Android's screen. When we launch it, it gives two options: Navigator Free (green color font) & Navigator (blue color). The app sometimes pops a message to ask for purchasing the TomTom map. There is no way to access this option from the free version's UI. The USA map costs 15 EUR on the paid version.
The date of each US states OSM can be found on the MapFactor website.
A Windows or Windows mobile version of the app can be found on its download page.
Navigator also works with Linux by using WINE program. See the Navigator Requirements page.
HERE
- Voice-guided turn-by-turn navigation
- offline use
- route planner
- save places
- not sure about the source of maps
- Nokia Apps LLC
My experience:
- when in navigation, it does not the road names for nearby location?
- it keeps saying the compass needs adjusted. It takes time to show the my current location when the way I drove is different from its suggested route.
- it took too many clicks to navigate.
- the route is strange.
Wifi and security
How to protect your personal information from hackers while on spring break
- When you want to go to your bank site or purchase something online with your credit card, hop OFF the public Wi-Fi and go onto a 3G or 4G cell carrier — it's much more secure. After you're done, you can go back to the public Wi-Fi.
- Every hour or two on a public Wi-Fi network, adjust your phone settings to forget the network, then log back in again. Better yet, when you first log onto any public network, shut off your phone's auto-join function.
- Try purposely logging onto the public Wi-Fi with the wrong password. If you can get on anyway, that's a sign that someone is monitoring you and you're not secure.
- Install anti-virus software like Norton anti-virus onto your phones and laptops.
Malware
Is There Pre-Installed Malware on Your New Android Smartphone?
VPN
The 5 Best VPNs for Android May 2, 2018
openvpn
Download a configuration file from vpngate.net. With this, we can act as if we are located in a different country.
vpn defender
tunnelBear VPN
mms streaming
Useful like studioclassroom.com where mx player cannot. vplayer ($5) moboplayer (need sd card?), WonderShare (works, similar to ms player interface) Rock Player 2, BSPlayer (supports mms, but not work), VLC player, RealPlayer.
Play youtube multiwindow
If your devices are not running Android 7 (Nougat), we need some way to watch youtube and open other apps at the same time.
- Float Tube Video
Play youtube in the background
If you devices are not running Android 7 (Nougat), try Firefox. This browser will allow you to continue to listen to the video of your choice with the screen off or while doing something else on your device.
Youtube Music offline mixtape
See Download music to listen to music offline
Click icon -> Downloads -> Offline mixtape.
Offline music player
https://www.makeuseof.com/tag/music-player-apps-android/
Network Signal Info
Hardware information
CPU-Z
AIDA64
Remote desktop/VNC
VNC
- bBNC: feel slow
- VNC view (from tightvnc): Port should be part of the IP (eg 192.168.1.xxx:5901). The mouse pt is different from the touch pt. Screen is kind of zoom-in. The desktop won't be moved.
- Remote Ripple: good response like VNC view. It has a mouse control image on the desktop. If you don't click the visual mouse, you are moving the desktop.
Remote desktop
- 2X RDP
- Windows RDP
Github
The source code is hosted on https://github.com/github/android
Bitbucket
Adobe flash player
- It does not support android 5.0.
- http://www.greenbot.com/article/2142627/how-to-hack-flash-support-onto-your-modern-android-phone.html
- Testing page http://www.adobe.com/software/flash/about/
Video Editor
Booking.com
Hotel reservations
Bluetooth Auto Connect
Bluetooth Volume
Blue light filter
I am using a paid version.
Since iOS 9.3, this is a built-in function (Blue light reduction) in Settings on Apple devices to do that.
nRF Master Control Panel (BLE)
AutoCAD 360
IFTTT
SwitftKey
Microsoft Office
NFC Tools
How to Automatically Launch Android Auto with NFC
Watchup
Play store & Plex acquires Watchup
Text messages
https://www.howtogeek.com/314963/the-best-texting-apps-for-android/ (7/17/2017)
How to Make Calls and Use Google Hangouts Like a Pro
https://www.makeuseof.com/tag/google-hangouts-tips/
How to Silence Phone Calls (But Not Text Messages and Notifications)
https://www.howtogeek.com/301644/how-to-silence-phone-calls-but-not-text-messages-and-notifications/
Terrarium TV
Is watching videos on Terrarium TV illegal?
CamScanner
Scan Documents on Your Phone with CamScanner for Android
Scanbot
After you scan your documents, you can mark up your scan with annotations and add signatures to documents using your finger.
Virtual Reality
10 Mobile Apps for Discovering Events Happening Around You
https://www.makeuseof.com/tag/mobile-apps-nearby-events/
Tethering
- FoxFi as mentioned in Sprint $15 unlimited data, talk & text deal.
Got a phone number away from Google voice
Pay $3 to port your number away from Google Voice
- https://slickdeals.net/f/11679183-sprint-unlimited-kickstart-plan-unlimited-data-talk-text-15-month-w-autopay-up-to-4-lines?page=80#commentsBox
- Use your Google Voice number with a cell phone service
- https://www.engadget.com/2014/04/19/how-to-port-your-google-voice-number-to-your-iphone/
Android System
Google Mobile Services vs Android Open Source Project/AOSP
http://www.howtogeek.com/232973/amazons-fire-os-vs.-googles-android-whats-the-difference/
File System Hierarchical
6.0 Mashmallow
- http://www.greenbot.com/article/2991395/android/android-60-marshmallow-review.html
- http://www.howtogeek.com/242937/how-to-set-up-a-new-sd-card-in-android-for-extra-storage/
- http://www.howtogeek.com/114667/how-to-install-android-apps-to-the-sd-card-by-default-move-almost-any-app-to-the-sd-card/
How to Secure Your Google Account
How to Secure Your Google Account
Developer Options
Go to Settings > About device and tap on Build number seven times to unlock the Developer options.
See How to kill Android apps and tasks running in the background.
Battery
5 vital Android settings that save your apps, data, battery and more
Notifications & sound
4 ways to turn off annoying notifications on your Android phone or iPhone
Auto restart when plugged to a charger
https://stackoverflow.com/questions/26294258/auto-boot-when-wall-charger-is-plugged
How to mount /system rewritable or read-only
https://android.stackexchange.com/questions/110927/how-to-mount-system-rewritable-or-read-only-rw-ro
How to Speed Up an Old Android Device With 3 Essential Tips
https://www.makeuseof.com/tag/speed-up-android-tips/
Android Oreo (8.x)
8 New Android Oreo Features You Should Know About
Basic(s)
A Word
Sometimes I'll get strange error messages when I do 'Run As Android Application'. The solution is to create a new Android app project and copy the code as I need.
A weird thing is Android SDK will automatically create project 'appcompat_v7', 'appcompat_v7_2', .... If we delete any one of them, it will screw up things.
See also https://developer.android.com/tools/support-library/setup.html, http://developer.android.com/tools/support-library/features.html
See message 1
Use "Ok Google" on Android
https://support.google.com/websearch/answer/6031948?co=GENIE.Platform%3DAndroid&hl=en
- Google App
- Languages: Default is English. It is OK to have multiple languages. For example, if I add 國語, Android is able to recognize both English and Chinese.
- In "Ok Google" detection, we can turn on the option of Say "Ok Google" any time. Your device recognizes your voice when you say "Ok Google", even if the screen is off or you're using your favorite apps.
APKMirror- Download Free Android APKs
Where to find the apk files on devices
See here. It is located under /data/app/.
The Android device needs
- If connecting for the first time, User is prompted to install the drivers in which case, point to $ANDROID_SDK_PATH/usb_driver, the drivers will get installed.
- Change your settings to permit apps that don’t come from the Google Market by going to the home screen and choosing MENU > Settings > Applications > Unknown Sources.
- Turn USB debugging ON on your phone, On your device go to the home screen, press MENU > Settings > Applications > Development, then enable USB debugging.
adb
Check connected devices by adb (under the same network)
- 10 shell commands
- https://developer.android.com/studio/command-line/adb.html and SDK Platform Tools download page
Enable USB debugging on your device first. Before this command can be used, we shall enable USB debugging from the 'Developer option' page. The 'Developer option' page is under Setting but is hidden. To make this screen visible, follow the instruction on http://developer.android.com/tools/device.html. That is, go to Settings > About phone and tap Build number seven times. Return to the previous screen to find Developer options at the bottom (tested on both of my Samsung S3, Nexus 9, ...).
If the android devices are connected to your computer using a USB cable, you can check if the connection is successful.
$ sdk/platform-tools/adb devices List of devices attached 2011060116402004 device
If the android devices are connected to the same network but not on your computer, use
$ adb tcpip 5555 $ adb connect device_ip_address # At the end $ adb disconnect <ip>:<port>
Note: on new Android SDK downloaded from http://developer.android.com/sdk/index.html, the adb command is under
Android/Sdk/platform-tools/
directory.
'Download' folder on Android
# tested on Oreo 8.0 $ sudo adb shell ls /sdcard/Download $ sudo adb push ~/Downloads/xxx /sdcard/Download/ $ sudo adb shell # interactively bullhead:/ $ ls bullhead:/ $ cd /sdcard bullhead:/sdcard $ ls AirWemo DCIM MyCarTracks Recorders camera-p.jpg Alarms Download Notifications Ringtones dianxin Android Movies Pictures XuiteMusic recordings CamScanner Music Podcasts backups
Then turn off usb debugging under developer options.
How to copy an apk file out to PC
Use adb pull. For example,
adb pull data/app/com.dotgears.flappybird-1.apk . adb pull sdcard/Download/SomeFile ~/Downloads/
Note that adding "/" to the beginning of "sdcard" or "data" is optional.
How to put an apk file on device
adb push local remote
Or use the adb install command to install an app. For example,
adb install com.dotgears.flappybird-1.apk
How to uninstall/delete apk files on devices
http://www.botskool.com/geeks/how-uninstall-apk-files-android-windows-sdk-emulator
cd SDK/tools adb shell ls data/app adb shell rm data/app/com.androidcan.asudoku.apk
How to copy a apk out from devices
http://stackoverflow.com/questions/4032960/how-do-i-get-an-apk-file-from-an-android-device. For example, the adobe reader
adb shell pm list packages adb shell pm path com.adobe.reader adb pull /data/app/com.adobe.reader-1.apk
Failed to install HelloWorld.apk on device (null) Error
Solution: Try changing the ADB connection timeout. I think it defaults that to 5000ms and I changed mine to 10000ms to get rid of that problem. If you are in Eclipse, you can do this by going through Window -> Preferences and then it is in DDMS under Android.
Build without running an application
Building vs running: Building will just generate apk file but running will install the app to the device.
See here. In Eclipse menu, Windows -> Preferences. From this Preferences window: Android -> Build. Now uncheck "Skip packaging and dexing until export or launch. (Speeds up automatic builds on file save.)". From now on, as long as we save any changes in source files, the apk file will be recreated.
Modified the 'name' shown on Eclipse Package Explorer
Modify the name tag in <.project> file (hidden file).
Structure of an App project
Before we create a new project in Eclipse, we have to enter some information.
- Application Name: the name that appears to users
- Project Name: the name of project directory and the name visible in Eclipse
- Package name: com.example.GUIDemo
- Minimum Required SDK: API 8
- Target SDK: API 18
- Compile With: API 19 (By default, this is set to the latest version of Android available in your SDK)
- Activity Name: MainActivity (will create <MainActivity.java> and MainActivity class)
- Layout Name: activity_main (will create <activity_main.xml>)
- Navigation type: None
src +-- com.example.guidemo +-- MainActivity.java res +-- layout +-- activity_main.xml +-- values +-- strings.xml AndroidManitest.xml proguard-project.txt project.properties .project
Command Line
$ android update project -p . $ ant debug // create an .apk file $ adb install bin/your-project-name-debug.apk // only install, will not run
Debug with Eclipse line by line
- http://www.vogella.com/tutorials/EclipseDebugging/article.html
- http://stackoverflow.com/questions/8551818/how-to-debug-android-application-line-by-line-using-eclipse
The Context Object
- See stackoverflow.
- Beginning android application book Chapter 2: Activities, fragments and intents -> Understanding Activities -> Displaying a Dialog Window.
Rotate AVD screen
- Enable NUMLOCK;
- Open your emulator and press the 7 followed by 9 on the NUMPAD on the right side of your keyboard;
Dialog
- See Chapter 2 of Beginning Android 4 App Development -> Understanding Activities
- http://www.vogella.com/tutorials/AndroidDialogs/article.html
- onCreateDialog(int) method
- AlertDialog(), ProgressDialog().
Intent
Linking activities using Intents.
- See Chapter 2 of Beginning Android 4 App Development -> Linking Activities using Intents
- http://www.vogella.com/tutorials/AndroidIntent/article.html
- startActivity(). To pass data back from an activity, use startActivityForResult() and onActivityResult().
- Intent-filter is defined in AndroidManifest.xml file. Other activities that wish to call this activity will invoke it via the activity's name in intent-filter.
- The category for the intent filter is android.intent.category.DEFAULT. You need to add this to the intent filter so that this activity can be started by another activity using the startActivity() method.
- Activities in Android can be invoked by any applications running on the device through intent-filter.
- The <intent-filter> element defines how your activity can be invoked by another activity. If another activity has the same filter name, then when you call the startActivity() method with the same android name in intent-filter, the Android OS will display a selection of activities. See Figure 2-12 in 'Beginning Android 4 App Development'.
- (Continue above) If you check the 'Use by default for this action" item, then to clear the default, we need to go to the Settings application in Android and select Apps > Manage applications, and then selection the app name. Scoll down to the bottom and click the 'Clear defaults' button.
AndroidManifest.xml
- It names the Java package for the application.
- It describes the components of the application — the activities, services, broadcast receivers, and content providers that the application is composed of.
- Android components register intent filters staticially in the AndroidManifest.xml.
- It determines which processes will host application components.
- It declares the minimum level of the Android API that the application requires.
Android nerd ranch book
01_FirstApp_GeoQuiz Project
activity_quiz.xml
Note that
- A layout is a resource, a piece of your application that is not code.
- To generate a resource ID for a widget, you include android:id attribute in the widget's definition.
- There is a + sign in the values for android:id but not n the values for android:text. This is because you are creating the IDs and only referencing the strings.
- Since we want to interact with 2 buttons in code, so only they need resource IDs.
- All resource IDs can be found in <gen/com.example.geoquiz/R.java>.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/question_text_view" android:padding="24dp" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/true_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/true_button" /> <Button android:id="@+id/false_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/false_button" /> </LinearLayout> </LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">GeoQuiz</string> <string name="question_text_view">The Pacific Ocean is larger than the Atlantic Ocean.</string> <string name="true_button">True</string> <string name="false_button">False</string> <string name="correct_toast">Correct!</string> <string name="incorrect_toast">Incorrect!</string> <string name="menu_settings">Settings</string> </resources>
QuizActivity.java
- Add two member variables to access the buttons (through resource IDs)
- Notice the prefix m on the member variable names.
- Import the class android.widget.Button for the buttons. It can be added by organizing imports. This can be done by keyboard shortcut Ctrl + Shift + O.
- To get references to widgets, we use the Activity method: findViewById(int id).
- To set listeners (review Java!), use setOnClickListener(OnClickListener) method; something like
mTrueButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Does nothing yet. } });
- Making toasts - a pop-up message. To create a toast, you call the method: makeText(Context context, int resId, int duration). The 2nd parameter is the resource ID of the string that the toast should display. After created a toast, you call Toast.show() on it to get it on screen.
So the complete java code looks like
package com.bignerdranch.android.geoquiz; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.Toast; public class QuizActivity extends Activity { Button mTrueButton; Button mFalseButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_quiz); mTrueButton = (Button)findViewById(R.id.true_button); mTrueButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(QuizActivity.this, R.string.incorrect_toast, Toast.LENGTH_SHORT) .show(); } }); mFalseButton = (Button)findViewById(R.id.false_button); mFalseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(QuizActivity.this, R.string.correct_toast, Toast.LENGTH_SHORT) .show(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_quiz, menu); return true; } }
02_MVC_GeoQuiz
Works.
03_ActivityLifecycle_GeoQuiz
Crash AVD for some reason. The whole practice is the same as Chapter 2 in Beginning Android 4 Application Development (the code works there).
05_SecondActivity_GeoQuiz
07_UIFragments_CriminalIntent
- One critical difference between the fragment lifecycle and the activity lifecycle is the fragment lifecycle methods are called by the hosting activity, not the OS.
Amazon Devices
Fire TV
Fire Tablet
- http://www.howtogeek.com/232726/how-to-install-the-google-play-store-on-your-amazon-fire-tablet/
- http://www.howtogeek.com/282425/how-to-install-the-google-play-store-on-the-amazon-fire-hd-8/
- http://www.howtogeek.com/270382/how-to-make-the-amazon-fire-tablet-more-like-stock-android/
- https://liliputing.com/2016/11/playing-fire-hacking-amazons-50-fire-tablet.html (11/24/2016)
Android + chroot + Ubuntu
Phone bands
Nexus 5x H790 has LTE bands. Spring uses LTE 25, 26. Tmobile uses LTE 12 & 17.
Nexus 5x H791 is international which remove LTE bands 12, 13 and 25. And it is GSM only; no CDMA.
See this for comparison.
Fine for AT&T (does not use band 12).
LTE discovery app.
GSM (open), CDMA (not open)
Sprint and Verizon are the primary CDMA carriers, while T-Mobile and AT&T are the two primary GSM carriers.
GSM is generally open; CDMA is not. Basically, neither Sprint nor Verizon offer options for customers to bring their own phones. GSM carriers—like AT&T, T-Mobile, MetroPCS, and US Cellular, for example—are pretty “open.” You can take most modern GSM smartphones, drop a SIM card from one of the aforementioned carriers in it, and it should just work, no matter where you bought it from.
See Are Cheap Android Phones Worth It?
sim card ID
How can I find my SIM card number (ICCID) on my Android phone?
Android Pay
Everything You Can Do With Google Pay