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Mobile Programming Closure 2
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yuichiro_takahashi
October 24, 2018
Technology
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Mobile Programming Closure 2
MobileProgrammingの授業のスライドです
yuichiro_takahashi
October 24, 2018
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Transcript
CLOSUREิ MOBILE PROGRAMMING OCT, 24TH
CLOSUREͱʁ
ςΩετ CLOSUREͱʁ(͓͞Β͍) ▸ ͱͯ͠ѻ͑Δؔ ▸ ແ໊ؔϥϜμࣜɺؔΦϒδΣΫτͱݴΘΕΔ͜ͱ͋ Γ·͢ ▸ ͱͯ͠ѻ͑ΔͷͰؔͷҾʹ͢͜ͱͰ͖Δ͠ ▸
Γͱͯ͠ฦ͢͜ͱͰ͖Δ
ΫϩʔδϟΛѻ͑Δ ͜ͱͰԿ͕خ͍͔͠ʁ
ςΩετ ΫϩʔδϟΛѻ͑Δ͜ͱͰԿ͕خ͍͠ͷ͔ʁ ▸ ॲཧΛநԽͤ͞Δ͜ͱ͕Ͱ͖Δ ▸ ॲཧΛநԽͤ͞Δ͜ͱͰਓؒʹಡΈ͍͢ίʔυʹͳΔ ▸ ࣮͍ͨ͠ॲཧʹϑΥʔΧε͢Δ͜ͱ͕Ͱ͖Δ
Ͳ͏͍͏͜ͱʁ
࢛ଇԋࢉͷྫ
ςΩετ ࢛ଇԋࢉͷྫ ▸ ྫ࢛͑ଇԋࢉͷؔΛ࡞Γ͍ͨͱ͠·͢ ▸ ͠ΫϩʔδϟΛΘͳ͍߹ ▸ ܭࢉͷͨΊͷܕͷҾ͕ೋͭ ▸ ͦΕͱͲͷܭࢉॲཧ(+,
*, -, /)Λ࣮ߦ͢Δ͔Λܾఆ͢ΔͨΊͷ จࣈྻͷҾ͕ҰͭඞཁʹͳΔͱࢥ͍·͢ ▸ ࣮࣍ͷΑ͏ʹͳΓ·͢
ςΩετ ࢛ଇԋࢉͷؔͷྫ func calculate(num1: Int, num2: Int, operator: String) ->
Int { switch operator { case "+": return num1 + num2 case "-": return num1 - num2 case "*": return num1 + num2 case "/": return num1 / num2 default: return num1 + num2 } } calculate(num1: 10, num2: 20, operator: "ˎ")
͜ΕͰ࣮ Ͱ͖͕ͨɾɾɾ
ςΩετ ࣮৭ʑ͕ɾɾɾ func calculate(num1: Int, num2: Int, operator: String) ->
Int { switch operator { case "+": return num1 + num2 case "-": return num1 - num2 case "*": return num1 + num2 case "/": return num1 / num2 default: return num1 + num2 } } calculate(num1: 10, num2: 20, operator: "ˎ") ͍switchΛॻ͔ͳ͍ͱ͍͚ͳ͍(ॲཧͷຊ࣭͡Όͳ͍)
ςΩετ ࣮৭ʑ͕ɾɾɾ func calculate(num1: Int, num2: Int, operator: String) ->
Int { switch operator { case "+": return num1 + num2 case "-": return num1 - num2 case "*": return num1 + num2 case "/": return num1 / num2 default: return num1 + num2 } } calculate(num1: 10, num2: 20, operator: "ˎ") ͍switchΛॻ͔ͳ͍ͱ͍͚ͳ͍(ॲཧͷຊ࣭͡Όͳ͍) ਖ਼͍͠จࣈ͕དྷͳ͔ͬͨ࣌ఆ͠ͳ͍ͱ͍͚ͳ͍(ॲ ཧͷຊ࣭͡Όry)
ςΩετ ࣮৭ʑ͕ɾɾɾ func calculate(num1: Int, num2: Int, operator: String) ->
Int { switch operator { case "+": return num1 + num2 case "-": return num1 - num2 case "*": return num1 + num2 case "/": return num1 / num2 default: return num1 + num2 } } calculate(num1: 10, num2: 20, operator: "ˎ") ͍switchΛॻ͔ͳ͍ͱ͍͚ͳ͍(ॲཧͷຊ࣭͡Όͳ͍) ਖ਼͍͠จࣈ͕དྷͳ͔ͬͨ࣌ఆ͠ͳ͍ͱ͍͚ͳ͍(ॲ ཧͷຊ࣭͡Όry) ͋ΕΕʙ?͓͔͍ͧ͠ʙ?
ςΩετ ࣮৭ʑ͕ɾɾɾ func calculate(num1: Int, num2: Int, operator: String) ->
Int { switch operator { case "+": return num1 + num2 case "-": return num1 - num2 case "*": return num1 + num2 case "/": return num1 / num2 default: return num1 + num2 } } calculate(num1: 10, num2: 20, operator: “ˎ”) ͍switchΛॻ͔ͳ͍ͱ͍͚ͳ͍(ॲཧͷຊ࣭͡Όͳ͍) ਖ਼͍͠จࣈ͕དྷͳ͔ͬͨ࣌ఆ͠ͳ͍ͱ͍͚ͳ͍(ॲ ཧͷຊ࣭͡Όry) ͋ΕΕʙ?͓͔͍ͧ͠ʙ? શ֯จࣈͯ͠ͳ͍ʁ
ςΩετ ࣮৭ʑ͕ɾɾɾ func calculate(num1: Int, num2: Int, operator: String) ->
Int { switch operator { case "+": return num1 + num2 case "-": return num1 - num2 case "*": return num1 + num2 case "/": return num1 / num2 default: return num1 + num2 } } calculate(num1: 10, num2: 20, operator: “ˎ”) ͍switchΛॻ͔ͳ͍ͱ͍͚ͳ͍(ॲཧͷຊ࣭͡Όͳ͍) ਖ਼͍͠จࣈ͕དྷͳ͔ͬͨ࣌ఆ͠ͳ͍ͱ͍͚ͳ͍(ॲ ཧͷຊ࣭͡Όry) ͋ΕΕʙ?͓͔͍ͧ͠ʙ? શ֯͡Όͳ͍ʁ
ςΩετ ৭ʑͳ͕ɾɾɾ ▸ ॲཧΛذͤ͞ΔͨΊʹswitchΛॻ͔ͳ͍ͱ͍͚ͳ͍ ▸ OperatorʹจࣈྻΛ͍ͬͯΔͷͰظ͠ͳ͍จࣈ(=ͱ͔)͕͖ͨ߹ఆ͠ͳ͍ ͱ͍͚ͳ͍(default) ▸ operatorͷจࣈྻͱ࣮ࡍͷܭࢉΛ߹Θͤͳ͍ͱ͍͚ͳ͍ ▸
ԋࢉͷछྨ͕૿͑ͨΒcaseΛ૿͞ͳ͍ͱ͍͚ͳ͍ ▸ ؔΛݺͼग़͢ͱ͖ʹoperatorͷจࣈΛλΠϙ͠ͳ͍Α͏ʹؾΛ͚ͭͳ͍ͱ͍͚ ͳ͍ ▸ ࢛ଇԋࢉͷؔͳͷͰܭࢉͤ͞ΔॲཧʹϑΥʔΧε͍͕ͨͦ͠ΕҎ֎ʹॻ͔ͳ͍ͱ ͍͚ͳ͍͜ͱɺߟ͑ͳ͍ͱ͍͚ͳ͍͜ͱ͕ଟ͍
Ͱ͠ܭࢉͷॲཧ ΛҾͱͯͤͨ͠ Βɾɾɾʁ
ςΩετ ܭࢉͷॲཧΛҾͱͯͤͨ͠Βɾɾɾʁ func calculate(num1: Int, num2: Int, calc: (Int, Int)
-> Int) -> Int { return calc(number1, number2) } // ͠ࢉ calculate(num1: 10, num2: 20) { $0 + $1 } // Ҿ͖ࢉ calculate(num1: 10, num2: 20) { $0 - $1 } // ֻ͚ࢉ calculate(num1: 10, num2: 20) { $0 * $1 } // ׂΓࢉ calculate(num1: 10, num2: 20) { $0 / $1 }
ςΩετ ܭࢉͷॲཧΛҾͱͯͤͨ͠Βɾɾɾʁ func calculate(num1: Int, num2: Int, calc: (Int, Int)
-> Int) -> Int { return calc(number1, number2) } // ͠ࢉ calculate(num1: 10, num2: 20) { $0 + $1 } // Ҿ͖ࢉ calculate(num1: 10, num2: 20) { $0 - $1 } // ֻ͚ࢉ calculate(num1: 10, num2: 20) { $0 * $1 } // ׂΓࢉ calculate(num1: 10, num2: 20) { $0 / $1 } จࣈͷΘΓʹܭࢉॲཧͦͷͷΛ͢Α͏ʹมߋ(typoͷ ৺͕ͳ͘ͳͬͨ)
ςΩετ ܭࢉͷॲཧΛҾͱͯͤͨ͠Βɾɾɾʁ func calculate(num1: Int, num2: Int, calc: (Int, Int)
-> Int) -> Int { return calc(number1, number2) } // ͠ࢉ calculate(num1: 10, num2: 20) { $0 + $1 } // Ҿ͖ࢉ calculate(num1: 10, num2: 20) { $0 - $1 } // ֻ͚ࢉ calculate(num1: 10, num2: 20) { $0 * $1 } // ׂΓࢉ calculate(num1: 10, num2: 20) { $0 / $1 } switchͷྶѹ͕ɾɾɾফ͑ͨɾɾɾʁ(ॲཧ͕γϯϓ ϧʹ) จࣈͷΘΓʹܭࢉॲཧͦͷͷΛ͢Α͏ʹมߋ(typoͷ ৺͕ͳ͘ͳͬͨ)
ςΩετ ܭࢉͷॲཧΛҾͱͯͤͨ͠Βɾɾɾʁ func calculate(num1: Int, num2: Int, calc: (Int, Int)
-> Int) -> Int { return calc(number1, number2) } // ͠ࢉ calculate(num1: 10, num2: 20) { $0 + $1 } // Ҿ͖ࢉ calculate(num1: 10, num2: 20) { $0 - $1 } // ֻ͚ࢉ calculate(num1: 10, num2: 20) { $0 * $1 } // ׂΓࢉ calculate(num1: 10, num2: 20) { $0 / $1 } switchͷྶѹ͕ɾɾɾফ͑ͨɾɾɾʁ(ॲཧ͕γϯϓ ϧʹ) จࣈͷΘΓʹܭࢉॲཧͦͷͷΛ͢Α͏ʹมߋ(typoͷ ৺͕ͳ͘ͳͬͨ) ॲཧΛ͍ͯ͠ΔͷͰߟ ͑Δ͜ͱ͕ݮΔ
ςΩετ ܭࢉͷॲཧΛҾͱͯͤͨ͠Βɾɾɾʁ func calculate(num1: Int, num2: Int, calc: (Int, Int)
-> Int) -> Int { return calc(number1, number2) } // ͠ࢉ calculate(num1: 10, num2: 20) { $0 + $1 } // Ҿ͖ࢉ calculate(num1: 10, num2: 20) { $0 - $1 } // ֻ͚ࢉ calculate(num1: 10, num2: 20) { $0 * $1 } // ׂΓࢉ calculate(num1: 10, num2: 20) { $0 / $1 } // ༨Γ calculate(num1: 10, num2: 20) { $0 % $1 } switchͷྶѹ͕ɾɾɾফ͑ͨɾɾɾʁ(ॲཧ͕γϯϓ ϧʹ) จࣈͷΘΓʹܭࢉॲཧͦͷͷΛ͢Α͏ʹมߋ(typoͷ ৺͕ͳ͘ͳͬͨ) ॲཧΛ͍ͯ͠ΔͷͰߟ ͑Δ͜ͱ͕ݮΔ ॲཧΛ͍ͯ͠ΔͷػೳՃʹΑ ΓॊೈͳରԠ͕Մೳʹ
͏গ͠ݟͯ Έ·͠ΐ͏
BUTTONͷΠϕϯ τϋϯυϥͷྫ
ςΩετ ANDROIDͷϘλϯΛ࣮͢Δ߹ɾɾɾ public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button) } } ·ͣLayoutϑΝΠϧ͔ΒButtonΛऔಘ
ςΩετ ANDROIDͷϘλϯΛ࣮͢Δ߹ɾɾɾ public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button).setOnClickListener(new OnClickListener() { }); } } OnClickListenerΫϥεΛ࡞ͯ͠ɾɾɾ
ςΩετ ANDROIDͷϘλϯΛ࣮͢Δ߹ɾɾɾ public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); } } onClickϝιουΛॻ͍ͯɾɾɾ
ςΩετ ANDROIDͷϘλϯΛ࣮͢Δ߹ɾɾɾ public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.d("Sample", "button is tapped!"); } }); } } λοϓ͞Εͨ࣌ͷίʔυΛॻ͘
͜ΕͰ࣮ Ͱ͖͕ͨɾɾɾ
ςΩετ Γ͕ɾɾɾ public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.d("Sample", "button is tapped!"); } }); } } λοϓ͞Εͨ࣌ͷॲཧΛॻ͖͍͚ͨͩͳͷʹ࣮·Ͱ͕ԕ͍
ΫϩʔδϟΛ ͤΕɾɾɾ
ςΩετ ΫϩʔδϟΛͤΕɾɾɾ public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button).setOnClickListener { Log.d("Sample", "button is tapped!"); }; } } ຊʹॻ͖͍ͨॲཧ͚ͩʹϑΥʔΧεͰ͖Δʂ
·ͱΊ
ςΩετ ·ͱΊ ▸ ΫϩʔδϟΛ͢͜ͱͰίʔυͷྔ͕ݮΔ ▸ ίʔυͷྔ͕ݮΔͷͰಡΈ͘͢ͳΔ ▸ ༨ܭͳίʔυΛॻ͔ͳͯ͘ࡁΉͷͰॻ͖͍ͨॲཧʹϑΥʔΧ ε͢Δ͜ͱ͕Ͱ͖Δ ▸
ͬͨͶʂͨ͑ͪΌΜʂ
ςΩετ શ෦Ϋϩʔδϟ͞Μͷ͓͔͛