Android修改默认字体巨细（小、默认、大、最大）

        通常修改屏幕表现巨细会通过调整屏幕密度来实现，但这调整的是整体的巨细。客户会经常要去调整至符合巨细，必要修改字体默认巨细可参考本文的内容
需求：字体默以为小
根据packages/apps/Settings/src/com/android/settings/display/FontSizePreferenceController.java

1. public class FontSizePreferenceController extends BasePreferenceController {
3.     public FontSizePreferenceController(Context context, String key) {
4.         super(context, key);
5.     }
7.     @Override
8.     public int getAvailabilityStatus() {
9.         return AVAILABLE;
10.     }
12.     @Override
13.     public CharSequence getSummary() {
14.         final float currentScale = Settings.System.getFloat(mContext.getContentResolver(),
15.                 Settings.System.FONT_SCALE, 1.0f);
16.         final Resources res = mContext.getResources();
17.         final String[] entries = res.getStringArray(R.array.entries_font_size);
18.         final String[] strEntryValues = res.getStringArray(R.array.entryvalues_font_size);
19.         final int index = ToggleFontSizePreferenceFragment.fontSizeValueToIndex(currentScale,
20.                 strEntryValues);
21.         return entries[index];
22.     }
23. }

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可知字体巨细是由Settings.System.FONT_SCALE来控制的
根据packages\apps\Settings\src\com\android\settings\display\ToggleFontSizePreferenceFragment.java

1. @Override
2.     public void onCreate(@Nullable Bundle savedInstanceState) {
3.         super.onCreate(savedInstanceState);
5.         final Resources res = getContext().getResources();
6.         final ContentResolver resolver = getContext().getContentResolver();
7.         // Mark the appropriate item in the preferences list.
8.         mEntries = res.getStringArray(R.array.entries_font_size);
9.         final String[] strEntryValues = res.getStringArray(R.array.entryvalues_font_size);
10.         final float currentScale =
11.                 Settings.System.getFloat(resolver, Settings.System.FONT_SCALE, 1.0f);
12.         mInitialIndex = fontSizeValueToIndex(currentScale, strEntryValues);
13.         mValues = new float[strEntryValues.length];
14.         for (int i = 0; i < strEntryValues.length; ++i) {
15.             mValues[i] = Float.parseFloat(strEntryValues[i]);
16.         }
17.         getActivity().setTitle(R.string.title_font_size);
18.     }

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可知修改的巨细应满足对应值：
packages/apps/Settings/res/values/arrays.xml

1. <string-array name="entries_font_size">
2.         <item msgid="6490061470416867723">Small</item>
3.         <item msgid="3579015730662088893">Default</item>
4.         <item msgid="1678068858001018666">Large</item>
5.         <item msgid="490158884605093126">Largest</item>
6.     </string-array>
8.     <string-array name="entryvalues_font_size" translatable="false">
9.         <item>0.85</item>
10.         <item>1.0</item>
11.         <item>1.15</item>
12.         <item>1.30</item>
13.     </string-array>

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故修改如下：

1. --- a/alps-mp-t0/vendor/mediatek/proprietary/packages/apps/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
2. +++ b/alps-mp-t0/vendor/mediatek/proprietary/packages/apps/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
3. @@ -2272,6 +2272,8 @@ class DatabaseHelper extends SQLiteOpenHelper {
5.              loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION,
6.                      R.bool.def_accelerometer_rotation);
7. +                                       
8. +                       loadSetting(stmt, Settings.System.FONT_SCALE, 0.85f);
10.              loadIntegerSetting(stmt, Settings.System.USER_ROTATION, R.integer.def_user_rotation);
12. diff --git a/alps-mp-t0/vendor/mediatek/proprietary/packages/apps/SettingsProvider/src/com/android/providers/settings/SettingsHelper.java b/alps-mp-t0/vendor/mediatek/proprietary/packages/apps/SettingsProvider/src/com/android/providers/settings/SettingsHelper.java
13. old mode 100644
14. new mode 100755
15. index 440bb67..6fd6c72
16. --- a/alps-mp-t0/vendor/mediatek/proprietary/packages/apps/SettingsProvider/src/com/android/providers/settings/SettingsHelper.java
17. +++ b/alps-mp-t0/vendor/mediatek/proprietary/packages/apps/SettingsProvider/src/com/android/providers/settings/SettingsHelper.java
18. @@ -360,7 +360,7 @@ public class SettingsHelper {
19.                          mContext.getContentResolver(), name, defaultScale);
20.                  return Math.abs(currentScale - defaultScale) >= FLOAT_TOLERANCE;
21.              case Settings.System.FONT_SCALE:
22. -                return Settings.System.getFloat(mContext.getContentResolver(), name, 1.0f) != 1.0f;
23. +                return Settings.System.getFloat(mContext.getContentResolver(), name,  0.85f) != 0.85f;
24.              default:
25.                  return false;
26.          }

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