Androidアプリを作る 第6回

Transcript

1. "OESPJE
   ΞϓϦΛ࡞Δ
    ,.$
   OPOZMFOF 
   ը૾ؔ܎ɾ+BWB
   ͔ΒͷϨΠΞ΢τɾઃఆ஋

2. ࣗݾ঺հ w OPOZMFOF
   ͷʹΕΜ
   w ,.$
   ճ
   w ΧʔϏΟͰ͢
   w

   ϙέϞϯϐΫϩεপ
   w SPPU

3. ࣗݾ঺հ w OPOZMFOF
   ͷʹΕΜ
   w εϚϗΞϓϦͱ͔
   w 5XJUUFS
   
   (JU)VC
   FUD
   w

   IUUQOPOZMFOFIBUFOBCMPHKQ

4. ͜Μ͹Μ͸

5. ࠓ೔΍Δ͜ͱ  ը૾ؔ܎
   *NBHF7JFX
    ϨΠΞ΢τ
   GSPN
   +BWB
    ઃఆ஋อଘ

6. 
   ը૾ؔ܎

7. *NBHF7JFX w Drawable Λදࣔ͢ΔͨΊͷ
   View ௨ৗͷ View ͷ background Ͱ΋දࣔͰ͖Δ͕ɺେ͖͞มߋͳͲ͕Ͱ͖ͳ͍.

8. "OESPJE
   ͷը૾ͷදݱ • Bitmap w ը૾Λද͢
   • Drawable w ʮը໘ʹදࣔ͞ΕΔ΋ͷʯΛද͢
   w

   ը૾͔΋͠Εͳ͍͠ɺͨͩͷ৭͔΋͠Εͳ͍
   w ImageView
   ΍എܠͰදࣔ͞ΕΔͷ͸͜Ε

9. "OESPJE
   ͷը૾ͷදݱ "OJNBUJPO
 %SBXBCMF #JUNBQ $PMPS "OJNBUJPO #JUNBQ%SBXBCMF $PMPS%SBXBCMF %SBXBCMF $POWFSU

10. ը૾Λ഑ஔ • res/drawable/ ʹ Drawable Λઃஔ͢Δ w ࠓճ͸ը૾
    
    1/(
    'JMF
    
    

    w 9.-
    Ͱهड़͢Δ͜ͱ΋Մೳ
    w ௚઀ϑΝΠϧΛίϐʔ͢Δ
    PS
 "OESPJE
    4UVEJP
    ܦ༝Ͱίϐʔ͢Δ ղ૾౓ผʹ࠷దͳը૾Λ༻ҙ͢Δ͜ͱ΋Ͱ͖Δ (drawable-hdpi ͳͲ)

11. ഑ஔྫ

12. ը૾Λදࣔ • android:src • ImageView Ͱදࣔ͢Δ Drawable Λઃఆ <ImageView android:layout_width="100dp"

    android:layout_height="100dp" android:src="@drawable/kirby" />

13. ը૾Λදࣔ

14. ը૾Λදࣔ w ิ଍
    w android:scaleType
    Ͱը૾ͷ֦େํ๏Λબ΂Δ
    w ৄࡉ͸লུ

15. 
    -BZPVU
    
 GSPN
    +BWB

16. +BWB
    ͰͷϨΠΞ΢τ w 9.-
    ʹॻ͍͍֤ͯͨ
    View
    ͸
    +BWB
    ͷΫϥε
    • TextView -> android.widget.TextView • EditText ->

    android.widget.EditText
 • શͯ View ΫϥεͷࢠΫϥε XML Ͱ͸ android.widget ʹ͋Δ View ͸ಛผʹύοέʔδ໊ΛলུͰ͖͍ͯͨ.
 ಠࣗͷ View ͷ৔߹লུͰ͖ͳ͍.

17. 7JFX
    ͷຊ࣭͸
    +BWB w 7JFX
    ͷॳظԽ͸
    7JFX
    ͷίϯετϥΫλͰ։࠵
    
    9.-
    Λύʔεʢղੳʣ
    
    7JFX
    ͷॳظԽॲཧΛ࣮ߦ
    ɾ ྫ
    andorid:text
    
    #setText(…)

18. 7JFX
    Λऔಘ

19. 7JFX
    Λऔಘ • View #findViewById(int id) w Activity
    ΍
    ViewGroup
    ʹੜ͑ͯΔ
    w ࢦఆͨ͠
    id
    ͷ
    View
    Λऔಘ

20. 7JFX
    Λऔಘ * MainActivity.java // setContentView લʹߦ͏ͱ View ͕औಘͰ͖ͳ͍ setContentView(R.layout.activity_main); EditText

    editText = (EditText) findViewById(R.id.post_edit); Button submitButton = (Button) findViewById(R.id.post_button);

21. * MainActivity.java // setContentView લʹߦ͏ͱ View ͕औಘͰ͖ͳ͍ setContentView(R.layout.activity_main); EditText editText

    = (EditText) findViewById(R.id.post_edit); Button submitButton = (Button) findViewById(R.id.post_button); 7JFX
    Λऔಘ
    *%
    ͕
    FEJU@UFYU
    ͷ
    7JFX
    Λऔಘ

22. * MainActivity.java // setContentView લʹߦ͏ͱ View ͕औಘͰ͖ͳ͍ setContentView(R.layout.activity_main); EditText editText

    = (EditText) findViewById(R.id.post_edit); Button submitButton = (Button) findViewById(R.id.post_button); 7JFX
    Λऔಘ
    &EJU5FYU
    ʹΩϟετͯ͠୅ೖ findViewById ͷฦΓ஋͸ View ݻఆͳͷͰΩϟετ͢Δඞཁ͕͋Δ

23. 7JFX
    Λ
 +BWB
    ͔Βૢ࡞

24. 7JFX
    Λૢ࡞ w 7JFX
    ͷؔ਺ΛݺͿ͜ͱͰૢ࡞͕Մೳ editText.setHint(“KMC"); editText.setVisibility(View.GONE); imageView.setImageResource(R.drawable.kirby); // pixel ୯ҐͳͷͰ஫ҙ submitButton.setWidth(300);

    // ॻ͔Εͨจࣈྻ͕ฦͬͯ͘Δ editText.getText();

25. w ͓͢͢Ί͠·ͤΜ
    w දࣔ͢Δ͚ͩͷίʔυ͕௕͘ෳࡶʹͳΔ w ࣮ࡍ΍ͬͯΔਓ΋͍Δ͚Ͳʜ
    w දࣔͷઃఆͱڍಈͷઃఆ͸෼͚͍ͨ
 w 9.-
    ʹॻ͚Δ෦෼͸ॻ͘͜ͱ͕ଟ͍

    શ෦
    +BWB
    Ͱॻ͚͹ศརʁ

26. ΫϦοΫ࣌ͷڍಈ

27. ΫϦοΫ࣌ͷڍಈ • View#setOnClickListener(
 OnClickListener listener) • ΫϦοΫ͞Εͨ࣌ʹݺ͹ΕΔϦεφΛઃఆ͢Δ • View.OnClickListener Λઃఆ


    • View.OnCliclListener ͱ͸ʁ

28. 7JFX0O$MJDL-JTUFOFS w ϝιου͕Ұͭઃఆ͞ΕͨΠϯλʔϑΣʔε
    w ΫϦοΫ࣌ʹ
    onClick
    ͕ݺͼग़͞ΕΔ * View.java (Android SDK) public

    interface OnClickListener { void onClick(View v); }

29. ΫϦοΫͰτʔετ

30. * MainActivity.java submitButton.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View

    v) { Toast.makeText(v.getContext(), “clicked!”, Toast.LENGTH_LONG ).show(); } } ); ϘλϯΫϦοΫͰτʔετɹ

31. * MainActivity.java submitButton.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View

    v) { Toast.makeText(v.getContext(), “clicked!”, Toast.LENGTH_LONG ).show(); } } ); ϘλϯΫϦοΫͰτʔετɹ
    0O$MJDL-JTUFOFS
    ͷແ໊ΦϒδΣΫτ

32. * MainActivity.java submitButton.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View

    v) { Toast.makeText(v.getContext(), “clicked!”, Toast.LENGTH_LONG ).show(); } } ); ϘλϯΫϦοΫͰτʔετɹ
    ΫϦοΫ͢Δͱݺ͹ΕΔؔ਺

33. * MainActivity.java submitButton.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View

    v) { Toast.makeText(v.getContext(), “clicked!”, Toast.LENGTH_LONG ).show(); } } ); ϘλϯΫϦοΫͰτʔετɹ
    τʔετΛදࣔ

34. ϘλϯΫϦοΫͰτʔετɹ ˠ Click

35. 
    ઃఆ஋อଘ

36. ઃఆ஋อଘ w ͍͔ͭ͘ͷํ๏͕͋Δ
    w 4IBSFE1SFGFSFODF
    
    w ࠓճ΍Γ·͢
    w 4RMJUF
    σʔλϕʔε

    
    w ֎෦ϥΠϒϥϦ

37. 4IBSFE1SFGFSFODF w ઃఆ஋ͳͲΛอଘ͢Δ࢓૊Έ
    w ΩʔόϦϡʔܗࣜͰอଘ
    w த਎͸
    9.-
    w อଘͰ͖Δܕ͸ݶΒΕ͍ͯΔ
    •

    int, long, float, boolean, String, Set<String>

38. 4IBSFE1SFGFSFODF w ෳ਺ͷ
    9.-
    ϑΝΠϧʹอଘͰ͖Δ
    w ϑΝΠϧ͝ͱʹΩʔ໊͸Ұҙ
    w ࠓճ͸σϑΥϧτͷ
    9.-
    ϑΝΠϧΛ࢖༻
    w ϑΝΠϧΛؒҧ͑ͯϋϚΒͳ͍Α͏ʹ
    w

    ؒҧ͑ͯެ։͞ΕΔ͜ͱ͕ͳ͍Α͏ʹ
    w ઃఆʹΑͬͯ͸ଞͷΞϓϦͰ΋ಡΈऔΕͯ͠·͏

39. 4IBSFE1SFGFSFODF • σϑΥϧτͷ SharedPreferences Λऔಘ • ϑΝΠϧ͝ͱͷઃఆ (SharedPreference) 
 Λ؅ཧ͢ΔΫϥε

    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context); Static ϝιου

40. 4IBSFE1SFGFSFODFT w อଘ sharedPreferences.edit() .putInt("hoge", 1) .putString("piyo", "piyoipyo") .putBoolean("foo", true)

    .apply();

41. 4IBSFE1SFGFSFODFT w อଘ sharedPreferences.edit() .putInt("hoge", 1) .putString("piyo", "piyoipyo") .putBoolean("foo", true)

    .apply();
    4IBSFE1SFGFSFOFT&EJUPS
    Λऔಘ

42. w อଘ sharedPreferences.edit() .putInt("hoge", 1) .putString("piyo", "piyoipyo") .putBoolean("foo", true) .apply();

    4IBSFE1SFGFSFODFT
    Ωʔͱ஋Λ֨ೲ put~~~ ͷฦΓ஋͸ editor ࣗ਎ͳͷͰ͜ͷΑ͏ʹॻ͚Δ ʢνΣʔϯϝιουͱ͍͏ʣ.

43. w อଘ sharedPreferences.edit() .putInt("hoge", 1) .putString("piyo", "piyoipyo") .putBoolean("foo", true) .apply();

    4IBSFE1SFGFSFODFT
    ઃఆΛ൓ө commit() ͸ಉظతͰ͕͔͔࣌ؒΔͷͰඇਪ঑

44. 4IBSFE1SFGFSFODFT w औΓग़͠ sharedPreferences.getInt("hoge", 0); sharedPreferences.getString("piyo", null); sharedPreferences.getBoolean("foo", false);
    ΩʔͱσϑΥϧτ஋Λࢦఆ