How to get device logs for Android Devices

USB Debugging:

To take android device log from PC/Mac, USB debugging should be enabled
in device. Following are the steps to enable USB debugging:

Enable USB Debugging in Android Devices

• Go to Settings > About phone.
• Then move on to Build number option
• Tap on Build number repeatedly about 7 times.
• After touching 7th time you will see a message that, you are now a developer.
• Now the ‘Developer options’ will be placed in Settings menu.
• Enter ‘Developer options’.
• Check on ‘USB Debugging’.
• Wanring popup ‘Allow USB debugging?’ will appear.
• Tap ‘Ok’ to confirm.

USB debugging in Android 4.0 and Later

• Go to settings.
• Enter ‘Developer options’.
• Check on ‘USB Debugging’.
• Warning popup ‘Allow USB debugging?’ will appear.
• Tap ‘Ok’ to confirm.

With USB debugging enabled, after connecting device to any PC/Mac, device will be connected as a media device.

Getting device log:

Logs from PC/Mac:

• Download android SDK tools. Android SDK tools can be downloaded from here: http://developer.android.com/sdk/
• In tools folder, there is a tool ‘monitor’. Open monitor.
• Connect the device with PC/Mac. Make sure USB debugging is enabled in device.
• Device will appear at top right ‘Device’ panel. Select the device (i.e. Nexus 5.1).
• Device log should appear at the bottom ‘Logcat’ panel.
• Device log can be filtered with log tag or other parameters.
• Select the necessary logs.
• Tap on ‘Save’ button to save.
• Device log will be saved as text file.

As numerous logs are recorded, clearing logs after saving would save redundancy in saved logs.

Logs from device:

There are many apps to record device log in google play store. The app CatLog’ is a convenient one. Note that rooting might be required for devices to record logs using CatLog. Following are steps to record device log using CatLog:

• Download ‘CatLog’ from google play store.
• Open CatLog. Keep this app in background while testing app.
• When device log needs to be saved, open CatLog.
• Tap on android options button on device.
• From these options device log can be saved in device or can be sent to =
  an email address as text file.