It represents a single screen in the app where the user can perform a single focused task such as sending an e-mail. It is usually presented to the user as a full-screen window.

Activity

This is presented to the user when the app is launched. It can then start other activities to perform different actions.

Main Activity

This is the set of states an activity can be in during its entire lifetime.

Activity life cycle

It is invoked when the app is launched for the first time. It happens only once for the entire life of the activity.

onCreate()

It is invoked before the activity becomes visible to the user. It is followed by either onResume() and onStop()

onStart()

It is invoked before the activity starts interacting with the user.

onResume()

It is invoked when the system is about to start resuming another activity.

onPause()

It is invoked when the activity is no longer visible to the user. It is followed by either: onRestart() or onDestroy()

onStop()

It is invoked when the activity is finishing due to the user completely dismissing the activity or due to finish() being called on the activity. or the system is temporarily destroying the activity due to a configuration change

onDestroy()

It is invoked if the activity comes back after being stopped. It is always followed by onStart().

onRestart()

Each time a new activity starts, the previous activity is stopped, but the system preserves the activity in a stack, What is it?

Back stack

An activity is started or activated with an _______?

Intent

It is an asynchronous message that is used in an activity to request an action from another activity, or from some other app component. It can be used to start one activity from another activity, and to pass data between activities.

Intent

Which statement is NOT TRUE about Intent

It represents a single screen in the app where the user can perform a single focused task such as sending an e-mail. It is usually presented to the user as a full-screen window.

"The activity that will receive the intent." Which part of intent is being described?

Target activity

"Contains a reference to the data you want the receiving activity to operate on." Which part of intent is being described?

Intent data/object

"Carry information the receiving activity requires to accomplish the requested action (optional)." Which part of intent is being described?

Intent extras

"May instruct the Android system how to launch an Activity or how to treat it after it's launched (optional)." Which part of intent is being described?

Intent flags

What are the two (2) types of intent?

Explicit and Implicit

"The target of the intent (the class name of the activity) is already identified." what type of intent is being described?

Explicit Intent

"The target of the intent is not yet identified but there is a general action to perform. It also includes an action, category, and data type." what type of intent is being described?

Implicit intent

Which is the correct syntax when making a button that is clickable?

android:onClick="LaunchActivity"

Which is the correct syntax needed? public void LaunchActivity(View view){ _______________________________ startActivity(intent); }

Intent intent = new Intent(this, Main2Activity.class);

It defines the structure for an app's user interface.

Layout

also known as a widget, This draws something the user can see and interact with

View

also known as a layout, It is an invisible container that defines the layout structure for View and other ViewGroup objects

ViewGroup

"The presentation of the app can be separated from the code that controls its behavior." Which way to create a layout is being described?

Declare UI elements in XML

"The View and ViewGroup objects can be created and their properties can be manipulated programmatically." Which way to create a layout is being described?

Instantiate layout elements at runtime

xml: <Button android:id="@+id/my_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/my_button_text"/> What's the correct syntax in creating an instance of the view object above and capture it from the layout?

Button myButton = (Button) findViewById(R.id.my_button);

Which is the correct syntax in manipulating the property of a widget in Java?

TextView myText = new TextView(this); myText.setText("Display this text!");

It is an interface to global information about an application environment.

Context

All view groups include this and each view is required to define them

width and height

"It sets the size of the view to the dimensions required by its content." Which width and height constant is being described?

wrap_content

"It sets the view to be as big as its parent view group will allow." Which width and height constant is being described?

match_parent

"It creates large and complex layouts with a flat view hierarchy (no nested view groups)." Which layout is being described?

Constraint Layout

"Organizes its child view elements into a single horizontal or vertical row." Which layout is being described?

Linear Layout

"It is used to specify the location of child objects relative to each other (child A to the left of child B) or to the parent (aligned to the top of the parent)." Which layout is being described?

Relative Layout

"It is used for displaying web pages." Which layout is being described?

Web View

"It is designed to block out an area on the screen to display a single item." Which layout is being described?

Frame Layout

"It arranges its child objects into rows and columns." Which layout is being described?

Table Layout

"It arranges its child objects in a rectangular grid that can be scrolled." Which layout is being described?

Grid Layout

Which is the correct syntax in creating a linear layout in xml?

Which is the correct syntax in creating a linear layout in java?

LinearLayout linearL = new LinearLayout(this); linearL.setOrientation(LinearLayout.VERTICAL); TextView myText = new TextView(this); myText.setText("Display this text!"); linearL.addView(myText); setContentView(linearL);

It is a message that Android displays outside the app's UI to provide the user with reminders, communication from other people, or other timely information from the app.

Notification

Which is the correct syntax in creating a notification?

NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID) .setSmallIcon(R.drawable.notification_icon) .setContentTitle(textTitle) .setContentText(textContent) .setPriority(NotificationCompat.PRIORITY_DEFAULT);

It allows to view more details and take actions with the notification.

Notification drawer

It provides a visual structure and interactive elements that are familiar to users.

App bar/Action bar

which statement is NOT a key feature in an app bar/action bar?

It provides simple feedback about an operation in a small popup.

Which is the correct syntax in creating a app bar/action bar?

Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar); setSupportActionBar(myToolbar);

It provides simple feedback about an operation in a small popup.

Toast

Which is the correct syntax in creating a toast?

Context context = getApplicationContext(); CharSequence text = "Hello toast!"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show();

It provides a quick pop-up message to the user.

Snackbar

Which is the correct syntax in creating a snack bar

Snackbar mySnackbar = Snackbar.make(view, stringId, duration); mySnackbar.show();

It is a small window that prompts the user to make a decision or enter additional information. It is not designed to fill the screen.

Dialog

Which is the correct syntax in creating a dialog?

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setMessage(R.string.dialog_message) .setTitle(R.string.dialog_title); AlertDialog dialog = builder.create();

It is used to present user actions and other options in the app's activities.