Android App Stores
Google's authorized devices have android with a built-in "Play" icon that accesses the Google Play store, a large collection of free and paid apps. If you buy an Android device without that icon, you can never use Google Play or any of its front-end sites (listed with it) to download apps - you must get them from independent 3rd party stores (listed from #2).
Installing Android Apps
Before you start, you must allow your phone to install apps from "other" Android stores:
Some stores provide an "app" to search and install their apps from your phone. This is easier than using the phone's browser but more difficult than using a PC browser. You usually have to setup a payment method in your account before you can buy paid apps, but free apps can be downloaded without any fuss.
If you buy and download from your desktop computer, you will need to transfer the APK file (android package that is used to install and app on your phone). To install the app on your phone, use "HTC Sync" desktop software and a USB connection. (The program that came on my phone SD card didn't work. Get the updated version at HTC.COM.) There are other methods of installing apps. There is an app that allows you to select an attachment (APK file) in a Gmail message and install it.
There is a Windows program called installAPK that install apps on your USB-connected phone by double clicking on the APK file on your PC. (android.modaco.com)
First download, install and run the HTC_Sync program on your computer. Then you connect the phone to your computer with a USB cable that came with your phone. The phone will immediately display a window asking you which of 3 choices you want to connect: "HTC Sync" or "disk drive" or "Mobile network sharing". Press "HTC Sync" and "Done". Back on the PC, select "Install app" and follow the prompts. Over on the phone, you will be prompted to install the app, and optionally to run it. Good idea in case it doesn't work on your phone - common problem with the HTC Tattoo (aka HTC Click).
If you acquire an app using a desktop PC, you can then copy the app file (xxx.APK) to your SD card and insert it into your android device. From Android's File Manager, navigate to the APK and select it. The android system should detect it's an APK, and ask if you want to install it. Select "yes". Once installed to your device, you may delete the APK file from your card.
To uninstall apps:
How to backup your phone's SD card to a hard drive
How to Copy Music files to your Android Phone
How to Convert Videos to Android 3pg Format
Android Videos must be stored in the 3pg format to view using the standard Android viewer. If your videos are in another format, you must find software that can convert to 3pg video files. The DVDVideoSoft Free Studio has a 3GP Video Converter can convert mp4 files to 3gp format. First install this converter and use it to create a new file in 3pg format. Then connect your phone as a Disk Drive using the USB connector. Next locate the DCIM\100MEDIA folder where photos are also located and copy your 3gp file into it. Now you can play the videos from the "Albums" apps that all Android system have for viewing photos and videos.
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