How to install .apk files on Android Phones

If you want to simply install an application on your Motorola Droid using a file quite like the way you install an application on your PC using an executable setup file then you have to get the application’s APK file. APK stands for Android Package. But before you can install an APK file, you must choose one of the two ways.
The first step is relatively easier and is the recommended way. Start by enabling installation of applications from third party sources. Then, launch the Android Market on the device and search for an app called ApkInstaller. Once you find it, install this app. Now you’re all set to install APK files.
Copy the APK file from your desktop to your device’s SD Card Drive and the unmount the device. Now launch the ApkInstaller app on the device and browse and locate the APK file you just copied to your device. Once you locate it, Tap the APK file to run the installer and finally Tap to install the application.
The second way is for the geeks and requires you to install Android SDK and USB Drivers. Modify your Android to allow installation of applications from other sources and enable “Disable Use for USB Storage” under settings. Now open the Command Prompt and simply issue: adb install /path/to/file.apk

Source: godevice
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