The Android Developer Documentation or developer.android.com is a very important reference and guide for newbies when it comes to Android programming. After doing this tutorial you will have the access to 2 important android docs offline. These are the Reference and Guide.

android-developer-doc-guide-reference-thumb

Android Developer Reference contains all the definitions the following terms:
android
android.accessibilityservice
android.accounts
android.animation
android.annotation
android.app
android.app.admin
android.app.assist
android.app.backup
android.app.job
android.app.usage
android.appwidget
android.bluetooth
android.bluetooth.le
android.content
android.content.pm
android.content.res
android.database
android.database.sqlite
android.databinding
android.drm
android.gesture
android.graphics
android.graphics.drawable
android.graphics.drawable.shapes
android.graphics.pdf
android.hardware
android.hardware.camera2
android.hardware.camera2.params
android.hardware.display
android.hardware.fingerprint
android.hardware.input
android.hardware.usb
android.icu.lang
android.icu.math
android.icu.text
android.icu.util
android.inputmethodservice
android.location
android.media
android.media.audiofx
android.media.browse
android.media.effect
android.media.midi
android.media.projection
android.media.session
android.media.tv
android.mtp
android.net
android.net.http
android.net.nsd
android.net.rtp
android.net.sip
android.net.wifi
android.net.wifi.p2p
android.net.wifi.p2p.nsd
android.nfc
android.nfc.cardemulation
android.nfc.tech
android.opengl
android.os
android.os.health
android.os.storage
android.preference
android.print
android.print.pdf
android.printservice
android.provider
android.renderscript
android.sax
android.security
android.security.keystore
android.service.carrier
android.service.chooser
android.service.dreams
android.service.media
android.service.notification
android.service.quicksettings
android.service.restrictions
android.service.textservice
android.service.voice
android.service.vr
android.service.wallpaper
android.speech
android.speech.tts
android.support.annotation
android.support.annotations
android.support.app.recommendation
android.support.customtabs
android.support.design
android.support.design.widget
android.support.graphics.drawable
android.support.multidex
android.support.percent
android.support.provider
android.support.v13.app
android.support.v13.view
android.support.v14.preference
android.support.v17.leanback
android.support.v17.leanback.app
android.support.v17.leanback.database
android.support.v17.leanback.graphics
android.support.v17.leanback.system
android.support.v17.leanback.widget
android.support.v17.leanback.widget.picker
android.support.v17.preference
android.support.v4
android.support.v4.accessibilityservice
android.support.v4.app
android.support.v4.content
android.support.v4.content.pm
android.support.v4.content.res
android.support.v4.database
android.support.v4.graphics
android.support.v4.graphics.drawable
android.support.v4.hardware.display
android.support.v4.hardware.fingerprint
android.support.v4.media
android.support.v4.media.session
android.support.v4.net
android.support.v4.os
android.support.v4.print
android.support.v4.provider
android.support.v4.text
android.support.v4.util
android.support.v4.view
android.support.v4.view.accessibility
android.support.v4.view.animation
android.support.v4.widget
android.support.v7.app
android.support.v7.appcompat
android.support.v7.cardview
android.support.v7.content.res
android.support.v7.graphics
android.support.v7.graphics.drawable
android.support.v7.gridlayout
android.support.v7.media
android.support.v7.mediarouter
android.support.v7.palette
android.support.v7.preference
android.support.v7.recyclerview
android.support.v7.util
android.support.v7.view
android.support.v7.widget
android.support.v7.widget.helper
android.support.v7.widget.util
android.support.v8.renderscript
android.system
android.telecom
android.telephony
android.telephony.cdma
android.telephony.gsm
android.test
android.test.mock
android.test.suitebuilder
android.test.suitebuilder.annotation
android.text
android.text.format
android.text.method
android.text.style
android.text.util
android.transition
android.util
android.view
android.view.accessibility
android.view.animation
android.view.inputmethod
android.view.textservice
android.webkit
android.widget
com.android.internal.backup
com.android.internal.logging
com.android.internal.os
com.android.internal.statusbar
com.android.internal.widget
com.android.test.runner
dalvik.annotation
dalvik.bytecode
dalvik.system
java.awt.font
java.beans
java.io
java.lang
java.lang.annotation
java.lang.ref
java.lang.reflect
java.math
java.net
java.nio
java.nio.channels
java.nio.channels.spi
java.nio.charset
java.nio.charset.spi
java.security
java.security.acl
java.security.cert
java.security.interfaces
java.security.spec
java.sql
java.text
java.util
java.util.concurrent
java.util.concurrent.atomic
java.util.concurrent.locks
java.util.function
java.util.jar
java.util.logging
java.util.prefs
java.util.regex
java.util.stream
java.util.zip
javax.crypto
javax.crypto.interfaces
javax.crypto.spec
javax.microedition.khronos.egl
javax.microedition.khronos.opengles
javax.net
javax.net.ssl
javax.security.auth
javax.security.auth.callback
javax.security.auth.login
javax.security.auth.x500
javax.security.cert
javax.sql
javax.xml
javax.xml.datatype
javax.xml.namespace
javax.xml.parsers
javax.xml.transform
javax.xml.transform.dom
javax.xml.transform.sax
javax.xml.transform.stream
javax.xml.validation
javax.xml.xpath
junit.framework
junit.runner
org.apache.http.conn
org.apache.http.conn.scheme
org.apache.http.conn.ssl
org.apache.http.params
org.json
org.w3c.dom
org.w3c.dom.ls
org.xml.sax
org.xml.sax.ext
org.xml.sax.helpers
org.xmlpull.v1
org.xmlpull.v1.sax2


Android Developer Guide contains the following:
Introduction to Android
App Components
App Resources
App Manifest
User Interface
Animation and Graphics
Computation
Media and Camera
Location and Sensors
Connectivity
Text and Input
Data Storage
Administration
Web Apps
Best Practices
Security

Now, follow the simple steps below to be able to download have a copy of developer.android.com locally.

NEEDED:
a. Stable internet connection (if you have a fast connection, that would be much better)

b. Enough space to put your Android Documentation folder, its size is about 400 MB).

c. A downloader like IDM or Internet Download Manager for faster downloading and "Resume Capability" of your download (meaning, you can pause your download and continue downloading later). But this one is optional.

STEPS:

1. To start downloading the Android Developer Documentation, just click the given link below:

2. If you have Internet download manager use it, if none then you can manually download it using your browser downloader.

3. I assume that you are already downloading the zip file. If so, just wait for it to finish. As mentioned earlier its size is about 400 MB so it will take some time.

4. Assuming that you already finished downloading the zip file, extract or unzip it.

5.  After step No. 4, you will now have the offline copy of Android Developer Documentation. I have screenshots below of Guide and Reference.

Reference:
android-developer-documentation-reference

Guide:
android-developer-documentation-guide

That's the simple tutorial for you to be able to have a local or offline copy of Android Developer Documentation. The availability of the Guide and Reference folders offline is very ideal if you do not have an internet connection because you can continue programming and still you can access these two if you need to check some terms or codes, as will as some guides in your programming adventure.

If you have something to share or ask about this tutorial, please do not hesitate to leave a comment below. Thanks!