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Lesson 1.1 - (GitHub)

What I learned:

• Android uses XML files for defining most of its features.
• Gradle is used for building projects.
• Log statements can be added that can help in debugging.

Homework:

Question 1
What is the name of the layout file for the main activity?

MainActivity.java
AndroidManifest.xml
activity_main.xml
build.gradle

Question 2
What is the name of the string resource that specifies the application’s name?

app_name
xmlns:app
android:name
applicationId

Question 3
Which tool do you use to create a new emulator?

Android Device Monitor
AVD Manager
SDK Manager
Theme Editor

Question 4
Assume that your app includes this logging statement:
Log.i("MainActivity", "MainActivity layout is complete");
You see the statement “MainActivity layout is complete” in the Logcat pane if the Log level menu is set to which of the following? (Hint: multiple answers are OK.)

Verbose
Debug
Info
Warn
Error
Assert

Lesson 1.2A - (GitHub)

What I learned:

• Android Studio has a convenient visual layout manager.
• It’s best practice to define strings in the resources folder.
• Button Handlers

Lesson 1.2B - (GitHub)

What I learned:

• Creating layout variants for horizontal layouts, tablets etc.
• Align baselines to align views that have text.
• LinearLayout and RelativeLayout ViewGroups.

Homework:

Question 1
Which two layout constraint attributes on the Zero Button position it vertically equal distance between the other two Button elements? (Pick 2 answers.)
The constraints determine location. The margins determine spacing.

app:layout_constraintBottom_toTopOf=”@+id/button_count”
android:layout_marginBottom=”8dp”
android:layout_marginStart=”16dp”
app:layout_constraintTop_toBottomOf=”@+id/button_toast”
android:layout_marginTop=”8dp”

Question 2
Which layout constraint attribute on the Zero Button positions it horizontally in alignment with the other two Button elements?

app:layout_constraintLeft_toLeftOf=”parent”
app:layout_constraintBottom_toTopOf=”@+id/button_count”
android:layout_marginBottom=”8dp”
app:layout_constraintTop_toBottomOf=”@+id/button_toast”

Question 3
What is the correct signature for a method used with the android:onClick XML attribute?

public void callMethod()
public void callMethod(View view)
private void callMethod(View view)
public boolean callMethod(View view)\

Question 4
The click handler for the Count Button starts with the following method signature:

public void countUp(View view)

Which of the following techniques is more efficient to use within this handler to change the Button element’s background color? Choose one:

Use findViewById to find the Count Button. Assign the result to a View variable, and then use setBackgroundColor().
Use the view parameter that is passed to the click handler with setBackgroundColor(): view.setBackgroundColor()

Lesson 1.3 - (GitHub)

What I learned:

• How to use ScrollViews
• Nesting ViewGroups

Homework

Question 1
How many views can you use within a ScrollView? Choose one:

One view only
One view or one view group
As many as you need

Question 2
Which XML attribute do you use in a LinearLayout to show views side by side? Choose one:

android:orientation=”horizontal”
android:orientation=”vertical”
android:layout_width=”wrap_content”

Question 3
Which XML attribute do you use to define the width of the LinearLayout inside the scrolling view? Choose one:

android:layout_width=”wrap_content”
android:layout_width=”match_parent”
android:layout_width=”200dp”