| Theresa Wellington | b0767a7 | 2019-10-01 00:17:46 | [diff] [blame] | 1 | # Chrome for Android UI |
| 2 | |
| 3 | ## Ramping-up |
| 4 | |
| 5 | Android has a number of [developer guides](https://developer.android.com/guide) that are helpful for getting ramped up on general Android development. We recommend reading the following as primers for developing UI: |
| 6 | |
| 7 | * [Application fundamentals](https://developer.android.com/guide/components/fundamentals) |
| 8 | * [Providing resources](https://developer.android.com/guide/topics/resources/providing-resources.html) |
| 9 | * [Layouts](https://developer.android.com/guide/topics/ui/declaring-layout) |
| 10 | * [Introduction to activities](https://developer.android.com/guide/components/activities/intro-activities) |
| 11 | |
| 12 | |
| 13 | ## Colors and text styles |
| 14 | |
| Lijin Shen | cea7dbe | 2020-04-23 19:58:05 | [diff] [blame] | 15 | Chrome for Android has a color palette defined in [//ui/android/java/res/values/color_palette.xml](/ui/android/java/res/values/color_palette.xml) and a set of reusable semantic colors defined in [//ui/android/java/res/values/semantic_colors_adaptive.xml](/ui/android/java/res/values/semantic_colors_adaptive.xml). The semantic colors from semantc_colors_adaptive.xml should be used to ensure colors adapt properly for dark mode and can be consistently and easily updated during product-wide visual refreshes. |
| Theresa Wellington | b0767a7 | 2019-10-01 00:17:46 | [diff] [blame] | 16 | |
| 17 | For more information on selecting the right color, see [Night Mode on Chrome Android](night_mode.md). |
| 18 | |
| Theresa Wellington | abc3e5c | 2019-10-01 16:55:55 | [diff] [blame] | 19 | Text should be styled with a pre-defined text appearance from [//ui/android/java/res/values-v17/styles.xml](/ui/android/java/res/values-v17/styles.xml). If leading (aka line height) is needed, use [org.chromium.ui.widget.TextViewWithLeading](/ui/android/java/src/org/chromium/ui/widget/TextViewWithLeading.java) with `app:leading` set to one of the pre-defined *_leading dimensions in [//ui/android/java/res/values/dimens.xml](/ui/android/java/res/values/dimens.xml). |
| 20 | |
| Theresa Wellington | b0767a7 | 2019-10-01 00:17:46 | [diff] [blame] | 21 | ## Widgets |
| 22 | |
| 23 | The Chromium code base contains a number of wrappers around Android classes (to smooth over bugs or save on binary size) and many UI widgets that provide Chrome-specific behavior and/or styling. |
| 24 | |
| Theresa Wellington | 95cc3b4 | 2020-01-25 21:25:05 | [diff] [blame] | 25 | These can be found in [//components/browser_ui/widget/android/](/components/browser_ui/widget/android/), [//ui/android/](/ui/android/), and [//chrome/android/java/src/org/chromium/chrome/browser/widget/](/chrome/android/java/src/org/chromium/chrome/browser/widget/). There is an ongoing effort to consolidate all widgets in //components/browser_ui/widget/android. |
| Theresa Wellington | b0767a7 | 2019-10-01 00:17:46 | [diff] [blame] | 26 | |
| 27 | ## MVC |
| 28 | |
| 29 | UI development should follow a modified Model-View-Controller pattern. MVC base classes live in [//ui/android/java/src/org/chromium/ui/modelutil](/ui/android/java/src/org/chromium/ui/modelutil/). |
| 30 | |
| 31 | The following guides introduce MVC in Chrome for Android: |
| 32 | |
| 33 | * [So, you want to do MVC...](mvc_architecture_tutorial.md) |
| 34 | * [Simple Lists in MVC Land](mvc_simple_list_tutorial.md) |
| 35 | * [Simple RecyclerView use in MVC](mvc_simple_recycler_view_tutorial.md) |
| 36 | * [So, you want to test MVC...](mvc_testing.md) |
