Android

Browsing

Zoom out

Context menu button + O

All hotkeys for Android

General
Go back

Esc

General
Menu

Ctrl + Esc

General
Search page

Alt + Space

General
Switch between tasks

Alt + ⭾ Tab

General
Switch between tasks

Alt + ↑   Shift + ⭾ Tab

Typing
Delete the character to the right of the cursor

↑   Shift + Del

Typing
Delete an entire line

Alt + Del

Typing
Activate caps-lock; press Shift once more to exit

↑   Shift then ↑   Shift

Typing
Move cursor to beginning of line

Alt +

Typing
Move cursor to end of line

Alt + →:

Gmail
Jump to top of inbox

Alt +

Gmail
Jump to bottom of inbox

Alt +

Typing
Highlight text for cutting or copying

↑   Shift + ←  →

Typing
Cut text (will cut all text on-screen unless specific characters are highlighted)

Context menu button + X

Gmail
Compose new e-mail

Context menu button + C

Typing
Paste text from clipboard

Context menu button + V

Typing
Select all text in the current field

Context menu button + A

Scrolling
Go to next page in any web page or document

Space

Scrolling
Go to previous page in any web page or document

↑   Shift + Space

Browsing
Zoom in

Context menu button + I

Browsing
Zoom out

Context menu button + O

Browsing
Go back a page

Context menu button + J

Browsing
Go forward a page

Context menu button + K

Browsing
Refresh current page

Context menu button + R

Browsing
Find on page

Context menu button + F

Browsing
Open bookmarks

Context menu button + B

Browsing
Open browser settings

Context menu button + S

Browsing
View browsing history

Context menu button + H

Gmail
Forward current message (works only while inside the message)

F

Gmail
Reply to current message (works only while inside the message)

R

Gmail
Reply-all to current message (works only while inside the message)

A

Gmail
Archive message (works from within message or while on main inbox list)

Y

Gmail
Refresh inbox

Context menu button + U

Gmail
Open an e-mail (from the main inbox list)

⤶ Enter

Running apps with shortcuts
Open browser

Win + B

Running apps with shortcuts
Open contacts

Win + C

Running apps with shortcuts
Open e-mail

Win + E

Running apps with shortcuts
Open Gmail

Win + G

Running apps with shortcuts
Open calendar

Win + I

Running apps with shortcuts
Open Maps

Win + M

Running apps with shortcuts
Open music

Win + P

Running apps with shortcuts
Open text messaging

Win + S

Running apps with shortcuts
Open YouTube

Win + Y

Running apps with shortcuts
information

*More

Running apps with shortcuts
these keyboard shortcuts doesn't seem to cut it, you can create your own keyboard shortcuts with External Keyboard Helper.

IF

Similar combinations for other applications