タブレット描画アプリに線幅変更を付けてみるハンズオンです。

1. Takahiro Yoshimura (@alterakey)
22.10.2011

2. Twitter →@alterakey

3. https://github.com/taky/effy

4. …

5. Effy ZIP

6. Eclipse
Android SDK
Effy

7. Eclipse Effy

9. DrawActivity
DA.plot
Paint Canvas

10. DrawActivity.java
private void initialSetup()
{
...
! this.setPenColor(color);
! this.paint.setStrokeWidth(5.0f);
}
→

11. …

12. res/xml/config.xml:
ConfigActivity:
ConfigKey:

13. <ListPreference>
res/values/arrays.xml

14. res/xml/config.xml
<ListPreference
android:key="pen_width"
android:title=" "
android:defaultValue="5"
android:entries="@array/entries_pen_width"
android:entryValues="@array/entry_values_pen_width" />

15. res/values/arrays.xml (1)
<string-array name="entries_pen_width">
<item> </item>
<item> </item>
<item> </item>
<item> </item>
<item> </item>
</string-array>

16. res/values/arrays.xml (2)
<string-array name="entry_values_pen_width">
<item>2</item>
<item>3</item>
<item>5</item>
<item>8</item>
<item>13</item>
</string-array>

17. CK PEN_WIDTH

18. ConfigKey.java
public class ConfigKey
{
! public static final String DROP_ALPHA = "drop_alpha";
! public static final String PEN_ALPHA = "pen_alpha";
public static final String PEN_WIDTH = "pen_width";
}

19. →
private CA.onCreate
CA.onResume
CA.updateSummary

20. ConfigActivity.java (1)
public class ConfigActivity extends PreferenceActivity ...
{
! private ListPreference drop_alpha;
! private ListPreference pen_alpha;
private ListPreference pen_width;
@Override
protected void onCreate(Bundle savedInstanceState) {

21. ConfigActivity.java (2)
@Override
protected void onCreate(Bundle savedInstanceState) {
...
this.pen_alpha = (ListPreference)getPreferenceScreen
().findPreference(ConfigKey.PEN_ALPHA);
this.pen_width = (ListPreference)getPreferenceScreen
().findPreference(ConfigKey.PEN_WIDTH);
}

22. ConfigActivity.java (3)
@Override
protected void onResume() {
...
this.updateSummary(sharedPreferences, ConfigKey.PEN_ALPHA);
this.updateSummary(sharedPreferences, ConfigKey.PEN_WIDTH);
...
}

23. ConfigActivity.java (4)
private void updateSummary(SharedPreferences ...
{
...
if (key.equals(ConfigKey.PEN_ALPHA))
this.setSummary(this.pen_alpha, this.pen_alpha.getEntry());
if (key.equals(ConfigKey.PEN_WIDTH))
this.setSummary(this.pen_width, this.pen_width.getEntry());
}

24. …

25. SharedPreferences

26. DA.initialSetup → DA.restyle
SharedPreferences
(DROP_ALPHA)
…

27. DrawActivity.java
private void initialSetup()
{
...
this.paint.setStrokeWidth(5.0f);
}

28. DrawActivity.java
private void restyle()
{
...
this.setPenColor(this.paint.getColor());
float pen_width = (float)Integer.parseInt(pref.getString
(ConfigKey.PEN_WIDTH, "5"));
this.paint.setStrokeWidth(pen_width);
}

29. …

30. DA.restyle():
“drop_alpha” → ConfigKey.DROP_ALPHA

31. Paint Canvas

32. github (GPL-3)

33. #5
Android 3.1
https://github.com/taky/effy/issues/5
Activity
: 3.2→OK 3.0/3.1→NG