Lesson 4 - Intents

Question 1

Intents

Answer 1

messaging objects; let an app request that an action take place; e.g. start new activity, display photo, make a call, etc.

Question 2

Intents metaphor

Answer 2

“envelopes”; who (which component) to send to, bit of data - packaged as EXTRAs (primitive tuples)

Question 3

explicit intent

Answer 3

includes name of target component

Question 4

add activity how?

Answer 4

dropdown menu for new activity, or file->new file

Question 5

add data to intent how?

Answer 5

put extra; stuffs data into intent

Question 6

putExtra() data retrieved how?

Answer 6

key, value; like JSON. putExtra(String name, String value)

Question 7

putExtra() String, String example

Answer 7

startChildActivityIntent.putExtra(Intent.EXTRA_TEXT, textEntered);

Question 8

how to get intent that created this activity; “get envelope”

Answer 8

getIntent();

Question 9

get string out of Intent; “open envelope”

Answer 9

getStringExtra(String name)

Question 10

explicit intent is?

Answer 10

where we know exactly what activity to start

Question 11

how to make explicit intent?

Answer 11

Intent(context, classOfActivityToStart)

Question 12

implicit intent is?

Answer 12

where we don’t know or care how our request will be fulfilled

Question 13

how to find examples of most used intents?

Answer 13

“common intents”

Question 14

URI?

Answer 14

like an address to data

Question 15

intent to launch website?

Answer 15

Intent(Intent.ACTION_VIEW, webpageUri)

Question 16

URI template

Answer 16

scheme:[//[user:password@]host[:port]][/]path[?query][#fragment]

Question 17

media type

Answer 17

2 part identifier for content on internet

Question 18

media type information

Answer 18

type, subtype, optional parameters

Question 19

media type text example

Answer 19

text, html, charset=UTF8

Question 20

ShareIntent.IntentBuilder syntax

Answer 20

ShareIntent.IntentBuilder
    .from(this)
    .setChooserTitle(title0
    .setType(mimeType)
    .setText(text)
    .startChooser();

Question 21

.startChooser();

Answer 21

IntentBuilder is basically a helper class for constructing sharing intents(Intent#ACTION_SEND and Intent#ACTION_SEND_MULTIPLE) and starting activities to share content.

also is there any other differences between these two functions

Under the hood, both startChooser() and startActivity() perform same action. startChooser() just wraps startActivity().