How to launch the Android emulator from the command line?

1. Go to SDK folder
Go to android sdk folder in which "android.bat" and "emulator.exe" are located.
ex) Default folder on Windows: C:\Users\{user}\AppData\Local\Android\sdk\tools

2. Run AVD manager
Type in "android avd" in the command prompt to launch the Android Virtual Devices manager.

3. Create AVD
Create a AVD by clicking "Create..." button.
Or you can just use the one already created from the list.

4. Launch emulator
Run the AVD either by using command "emulator -avd <name>" or by clicking "Start..." button on the AVD manager.

How to install app in Android emulator?

1. Launch emulator
Go to here to see how to launch Android Emulator.

2. Copy the apk file to platform-tools folder
ex) Default folder on Windows: C:\Users\{user}\AppData\Local\Android\sdk\platform-tools

3. Go to command prompt
Type "adb install filename.apk" to install
Type "adb install -r filename.apk" to re-install

4. Run emulator then you will see the app is installed.