Lesson 2 Making an App Interactive

Content

• 1.Gist
• 2.Java Escape Characters
• 3.String in Java
• 4.Practice Set 2

1.Gist

• DESCRIPTION:A computer is a machine that follows a list of instructions called a program. An Android device is a computer and an app is a program.
  A snippet is a short, self-contained excerpt from an app, demonstrating how to instruct the device to do something. We can re-use the snippet by pasting it into one of our own apps, possibly with some minimal changes.
  One way to share a snippet is to post it on the GitHub websitehttps://gist.github.com/. A snippet shared there is called a gist. You can then share a link to the gist with your friends.
  
  Gist

2.Java Escape Characters

Paste_Image.png

3.String in Java

• Updating String Variable

  
  
  Updating String Variable

• string + int

  
  
  string + int

Practice Set 2

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        android:layout_alignParentTop="true"

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:fontFamily="sans-serif-medium"
                android:gravity="center_horizontal"
                android:padding="4dp"
                android:text="Team A"
                android:textColor="#616161"
                android:textSize="14sp" />

            <TextView
                android:id="@+id/team_a_score"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-medium"
                android:gravity="center_horizontal"
                android:padding="4dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="56sp" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="32dp"
                android:layout_marginRight="32dp"
                android:onClick="addThreeForTeamA"
                android:text="+3 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="32dp"
                android:layout_marginRight="32dp"
                android:onClick="addTwoForTeamA"
                android:text="+2 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="32dp"
                android:layout_marginRight="32dp"
                android:onClick="addOneForTeamA"
                android:text="Free Throw" />
        </LinearLayout>

        <View
            android:layout_width="1dp"
            android:layout_height="match_parent"
            android:background="@android:color/darker_gray" />

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:fontFamily="sans-serif-medium"
                android:gravity="center_horizontal"
                android:padding="4dp"
                android:text="Team B"
                android:textColor="#616161"
                android:textSize="14sp" />

            <TextView
                android:id="@+id/team_b_score"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-medium"
                android:gravity="center_horizontal"
                android:padding="4dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="56sp" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="32dp"
                android:layout_marginRight="32dp"
                android:onClick="addThreeForTeamB"
                android:text="+3 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="32dp"
                android:layout_marginRight="32dp"
                android:onClick="addTwoForTeamB"
                android:text="+2 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="32dp"
                android:layout_marginRight="32dp"
                android:onClick="addOneForTeamB"
                android:text="Free Throw" />
        </LinearLayout>
    </LinearLayout>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:onClick="reset"
        android:text="reset" />
</RelativeLayout>

Paste_Image.png