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