Localization plugin #74

langsmith · 2017-08-07T19:36:46Z

This plugin resolves #36 and enables a developer to localize the map text to the language set on the Android device.

The plugin also has individual methods for converting the map to each of the languages that we support. Anyways, here it is.

cc @tobrun @1ec5 @jcsg

langsmith · 2017-08-07T19:39:56Z

And yes, I will create a test class too

langsmith · 2017-08-09T20:33:05Z

FYI, here's why the test is failing 👇

tobrun · 2017-08-10T08:12:27Z

@langsmith if you aren't adding any instrumentation tests, feel free to remove that example file.

cammace · 2017-08-30T03:39:25Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+    String deviceLanguage = Locale.getDefault().getLanguage();
+    for (Layer layer : listOfMapLayers) {
+      // TODO: Fix if() statement? What should if statement be looking for in layer ids?
+      if (layer.getId().contains("")) {


Briefly looking over this, I think you are looking to change all Symbol layers? For that you can do if(layer instanceof SymbolLayer) {}

cammace · 2017-08-30T03:41:14Z

plugins/localization/proguard-rules.pro

@@ -0,0 +1,25 @@
+# Add project specific ProGuard rules here.


Doesn't look like this ProGuard files needed.

cammace · 2017-08-30T03:42:59Z

plugins/localization/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">localization</string>


Don't need this file

langsmith · 2017-08-30T19:38:20Z

Note: Cameron's review requests have been addressed.

1ec5 · 2017-08-31T16:59:34Z

I added an individual method for converting the map to each of the languages that we support. Maybe they don't belong in this plugin.

There does need to be a list hard-coded somewhere, until mapbox/tilejson-spec#14 is implemented. (Someday…) Note that the canonical list of available languages is in the Mapbox Streets source v7 documentation.

1ec5 · 2017-08-31T17:03:30Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+  public LocalizationPlugin(@NonNull final MapboxMap mapboxMap) {
+    listOfMapLayers = mapboxMap.getLayers();
+    String deviceLanguage = Locale.getDefault().getLanguage();
+    for (Layer layer : listOfMapLayers) {


What if the style includes layers that use a source other than Mapbox Streets? For example, there may be a layer based on a custom Studio dataset that also has a {name} property but no corresponding {name_*} properties.

Now checking for Mapbox-only sources with this commit

0314d08

It turns out that commit doesn’t actually filter by source. Instead, it reruns the code once for each source, meaning that each layer gets processed one time per source. The Android map SDK apparently lacks a way to determine the source that a layer is using: mapbox/mapbox-gl-native#12691.

1ec5 · 2017-08-31T17:04:15Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+    String deviceLanguage = Locale.getDefault().getLanguage();
+    for (Layer layer : listOfMapLayers) {
+      if (layer instanceof SymbolLayer) {
+        layer.setProperties(PropertyFactory.textField(String.format("{name_%s}", deviceLanguage)));


What if the symbol layer had no textField to begin with, or what if it was set to {ref}? Would highway shields start displaying road names instead of route numbers?

Note that, as a cartographic choice, most Mapbox-designed styles use {abbr} at low zoom levels. However, {abbr} is only available in English, so it should also be replaced by {name_*} when the language isn’t English. (See mapbox/mapbox-gl-native#9902 for the corresponding iOS/macOS issue.)

It can definitely be cleaned up, but here's mytextField check for now 😕 :

mapbox-plugins-android/plugin-localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

Lines 36 to 42 in 5a1c285

if (layer instanceof SymbolLayer) {

if (((SymbolLayer) layer).getTextField() != null) {

if (((SymbolLayer) layer).getTextField().getValue() != null &&

!((SymbolLayer) layer).getTextField().getValue().isEmpty()) {

if (((SymbolLayer) layer).getTextField().getValue().contains("name")) {

layer.setProperties(textField(String.format("{name_%s}", getDeviceLanguage())));

}

{abbr} check and adjustment:

mapbox-plugins-android/plugin-localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

Lines 43 to 46 in 5a1c285

if (((SymbolLayer) layer).getTextField().getValue().contains("abbr") &&

!getDeviceLanguage().equals("en")) {

layer.setProperties(textField(String.format("{name_%s}", getDeviceLanguage())));

}

1ec5 · 2017-08-31T17:05:58Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+  /**
+   * Sets map text to Traditional Chinese.
+   */
+  public void setMapTextToTraditionalChinese() {


{name_zh} is Chinese in general, not necessarily Traditional Chinese. For example, country labels are in Simplified Chinese, as are places in 🇨🇳.

Cool. Changed the method name to setMapTextToChinese() and added explanatory javadocs for both methods. Now reads as 👇

/** * Sets map text to Chinese. * * This method uses simplified Chinese characters for custom label layers: #country_label, #state_label, * and #marine_label. All other label layers are sourced from OpenStreetMap and may contain one of several dialects * and either simplified or traditional Chinese characters in the {name_zh} field. */ public void setMapTextToChinese() { setMapTextLanguage("zh"); } /** * Sets map text to Simplified Chinese. * * Using this method is similar to setMapTextToChinese() (see above), except any Traditional Chinese * characters are automatically transformed to Simplified Chinese. */ public void setMapTextToSimplifiedChinese() { setMapTextLanguage("zh-Hans"); }

1ec5 · 2017-08-31T17:09:09Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+   */
+  public LocalizationPlugin(@NonNull final MapboxMap mapboxMap) {
+    listOfMapLayers = mapboxMap.getLayers();
+    String deviceLanguage = Locale.getDefault().getLanguage();


According to this documentation, getLanguage() returns deprecated ISO 639 codes, such as iw for Hebrew instead of the current standard he. For forward-compatibility, consider using one of the other available methods.

Additionally, will this method return zh-Hans when the user chooses Chinese (Simplified) in their device settings?

https://gist.github.com/SeanZoR/9152167 👀

https://developer.android.com/reference/java/util/Locale.html

https://www.loc.gov/standards/iso639-2/php/code_changes.php

https://web.archive.org/web/20131209133616/http://code.google.com/p/android/issues/detail?id=3639

I made this commit which checks for and adjusts known deprecated ISO 639 codes. After lots of research, it doesn't seem like there's a single method that covers the backward and forwards compatibility that @1ec5 mentions above. Let's let my commit ✅ this comment for now so that this isn't a blocker for getting this plugin released.

This commit addresses simplified/traditional Chinese selection

How about toLanguageTag?

yea, looked into it. For some reason, I think I read that it wouldn't work both ways, but I don't remember exactly why now 😵 . That link you just gave above, does sound like it would work for covering back and forwards compatibility. Will look back into it

Using toLanguageTag() if api level is above 21.

Both issues brought up in OP have been addressed.

langsmith · 2017-08-31T17:19:23Z

Thanks @1ec5 . Lots more to learn/fix 👍

There does need to be a list hard-coded somewhere, until mapbox/tilejson-spec#14 is >implemented. (Someday…) Note that the canonical list of available languages is in the Mapbox >Streets source v7 documentation.

Are there specific changes that I need to make related to ☝️ or was that just a comment? Couldn't tell

1ec5 · 2017-08-31T17:50:15Z

Note that the canonical list of available languages is in the Mapbox >Streets source v7 documentation.

Are there specific changes that I need to make related to ☝️ or was that just a comment? Couldn't tell

No changes needed for now. The canonical list is maintained by the cartography team and is more likely to be kept up-to-date than the /help document.

1ec5 · 2017-08-31T20:09:56Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+  /**
+   * Sets map text to Simplified Chinese.
+   *
+   * Using his method is similar to setMapTextToChinese() (see above), except any Traditional Chinese


Typo: his method.

1ec5 · 2017-08-31T20:10:34Z

plugins/app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationPlugin.java

+  /**
+   * Sets map text to Simplified Chinese.
+   *
+   * Using his method is similar to setMapTextToChinese() (see above), except any Traditional Chinese


(see above)

Doesn’t JavaDoc autolink method references? That would make glosses like this unnecessary.

1ec5 · 2017-08-31T20:19:17Z

plugins/app/src/main/res/menu/menu_languages.xml

+
+    <item
+        android:id="@+id/chinese"
+        android:title="Traditional Chinese"


Replace with “Chinese”.

1ec5

Looks good to me (a total nondroid).

cammace · 2017-12-01T20:10:51Z

I cleaned up a bunch of the code and moved things around to reflect the latest changes made in master. Would be good to continue working on this and merging it.

langsmith · 2017-12-01T20:41:33Z

Thanks @cammace

langsmith · 2018-01-09T20:13:28Z

After lots of refactoring, this is what the test app activity is looking like

1ec5 · 2018-01-10T05:59:47Z

...localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

+   */
+  private boolean sourceIsFromMapbox(Source singleSource) {
+    return singleSource instanceof VectorSource
+      && ((VectorSource) singleSource).getUrl().contains("mapbox://mapbox.mapbox");


Many Mapbox-designed styles – indeed, many styles designed in Studio – use a single composite source whose URL is mapbox://mapbox.mapbox-terrain-v2,mapbox.mapbox-streets-v7. By only checking if the URL begins with mapbox://mapbox.mapbox, this code may inadvertently snag sources that consist of mapbox.satellite or mapbox.terrain composited with a Studio-managed dataset.

The iOS/macOS map SDK’s implementation considers the source to be the Mapbox Streets source – the only one this plugin can reliably localize – if both of the following conditions hold:

The URL scheme is mapbox; that is, the URL begins with mapbox://.

The URL’s hostname is a comma-delimited list containing either mapbox.mapbox-streets-v7 or mapbox.mapbox-streets-v6. (The latter doesn’t matter so much at this point.)

Thanks @1ec5 . Will adjust based on your comments. 🚀

Although I don't create String arrays like the iOS/macOS map SDK’s implementation, I believe that the way I've handled scheme/hostname check will work just fine:

mapbox-plugins-android/plugin-localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

Lines 109 to 111 in 08d5ef3

&& ((VectorSource) singleSource).getUrl().substring(0, 9).equals("mapbox://")

&& (((VectorSource) singleSource).getUrl().contains("mapbox.mapbox-streets-v7")

|| ((VectorSource) singleSource).getUrl().contains("mapbox.mapbox-streets-v6"));

Yeah, I think it’s robust enough. It’s unlikely that someone would create an account named likemapbox and upload a dataset named mapbox-streets-v71 to it. It’s also going to be awhile before the cartography team gets a chance to release Mapbox Streets source v60.

1ec5 · 2018-02-03T19:10:57Z

...localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

+              layer.setProperties(textField(String.format("{name_%s}", languageToSetMapTo)));
+            }
+            if (((SymbolLayer) layer).getTextField().getValue().contains("abbr")
+              && !getDeviceLanguage().equals("en")) {


This assumes the style was set to use name_en in the first place, which is true about most Mapbox-designed styles like Mapbox Streets. However, it’d be totally reasonable for a style to use name (local language) right out of the gate.

For reference, the iOS and macOS map SDKs preserve the style’s original language (e.g., English) unless the localizesLabels feature is enabled. Once the feature is enabled, it changes every name and name_* to the device language, falling back to name_en if the device language is unsupported. So whether the style originally used name_en, name, or name_zh, the localization feature will still take effect.

(The Mapbox GL Language plugin for GL JS has a defaultLanguage option instead of falling back to English.)

Removed the && !getDeviceLanguage().equals("en") assumption in this commit 86be093

The comment below addresses the checking and fallback functions that I've built in.

1ec5 · 2018-02-03T19:18:05Z

app/src/main/java/com/mapbox/mapboxsdk/plugins/testapp/activity/LocalizationActivity.java

+      Toast.makeText(this, R.string.map_not_localized, Toast.LENGTH_SHORT).show();
+      mapIsLocalized = false;
+    } else {
+      localizationPlugin.setMapTextLanguage(localizationPlugin.getDeviceLanguage());


If the device language happens to be a language that the Mapbox Streets source doesn’t support, such as Thai, this plugin will end up changing all the layers to {name_th}, producing undesired results. This plugin needs to check that the device language is supported, falling back to either English or the local language. (The iOS and macOS map SDKs fall back to English, whereas the Mapbox GL Language plugin for GL JS falls back to a default language that the developer specifies as an option.)

I believe that af59d95 now fixes this. I've added a preferred backup language parameter for the initialization of the plugin.

mapbox-plugins-android/plugin-localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

Line 39 in af59d95

public LocalizationPlugin(@NonNull MapboxMap mapboxMap, @NonNull String backupLanguage) {

I also added a check to make sure that a language is supported by Mapbox Streets style source

mapbox-plugins-android/plugin-localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

Lines 87 to 97 in af59d95

private boolean openStreetMapSupportsLanguage(String languageTag) {

return languageTag.equals("ar")

|| languageTag.equals("en")

|| languageTag.equals("es")

|| languageTag.equals("fr")

|| languageTag.equals("de")

|| languageTag.equals("pt")

|| languageTag.equals("ru")

|| languageTag.equals("zh")

|| languageTag.equals("zh-Hans");

}

If the check detects that the device language isn't supported, then the backup language is checked and set. English is the final fall back if the backup language isn't supported by Mapbox Streets style source either

mapbox-plugins-android/plugin-localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

Lines 130 to 138 in af59d95

public void setMapTextLanguage(String language) {

if (openStreetMapSupportsLanguage(getDeviceLanguage())) {

adjustMapTextLayers(language);

} else if (openStreetMapSupportsLanguage(selectedBackupLanguage)) {

adjustMapTextLayers(selectedBackupLanguage);

} else {

adjustMapTextLayers("en");

}

}

1ec5 · 2018-02-06T06:55:55Z

...localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

-   * @param mapboxMap the MapboxMap to apply the localization plugin to
+   * @param mapboxMap      the MapboxMap to apply the localization plugin to
+   * @param backupLanguage the default language for the map to fall back to if the device language is not
+   *                       supported by Open Street Maps.


Nit: OpenStreetMap is capable of providing names in every language that has an ISO 639 code. (Coverage is uneven from one language to another.) It’s the Mapbox Streets source that’s currently limited to a handful of languages.

Fixed. Thanks

1ec5 · 2018-02-06T06:58:13Z

...localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

-            if (((SymbolLayer) layer).getTextField().getValue().contains("abbr")
-              && !getDeviceLanguage().equals("en")) {
+            if (((SymbolLayer) layer).getTextField().getValue().contains("name")
+              || ((SymbolLayer) layer).getTextField().getValue().equals("abbr")) {


If the language is English and the text field is {abbr}, we should use {abbr}, because that field is written in English.

langsmith · 2018-02-06T17:46:13Z

Per @1ec5 's suggestion, let's add installation instructions to this help page before releasing this plugin. I will handle this.

cc @colleenmcginnis

1ec5 · 2018-02-07T00:19:27Z

...localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

+            if (((SymbolLayer) layer).getTextField().getValue().contains("{name")
+              || !getDeviceLanguage().equals("en") && ((SymbolLayer) layer).getTextField().getValue().contains("{abbr}")
+              ) {
+              layer.setProperties(textField(String.format("{name_%s}", languageToSetMapTo)));


If text-field was originally set to something like {name_en} ({name}), this would replace it with just {name_en} for English speakers. I think it would be better to get the text field value as a string, then find and replace {name} and {name_*} with {name_xy} (where xy is languageToSetMapTo), then set the modified string as the text field.

I addressed this issue by using a regrex and replacing only the {name_*} part in textfields.

1ec5 · 2018-02-07T00:24:13Z

...localization/src/main/java/com.mapbox.mapboxsdk.plugins.localization/LocalizationPlugin.java

+  private boolean layerHasAdjustableTextField(Layer singleLayer) {
+    return singleLayer instanceof SymbolLayer && (((SymbolLayer) singleLayer).getTextField() != null
+      && (((SymbolLayer) singleLayer).getTextField().getValue() != null
+      && !(((SymbolLayer) singleLayer).getTextField().getValue().isEmpty())));


As tail work, consider making this plugin also affect layers whose text-field property is set to a function. In the Mapbox Streets style, for example, U.S. state labels are a function with stops for either {name_en} or {abbr} based on the zoom level.

Without accounting for functions, there will be some inconsistency in state and country labels at low zoom levels. However, expressions will be available in the next release, so it might not be worth spending much effort accommodating functions in the meantime.

/ref mapbox/mapbox-gl-native#10713 mapbox/mapbox-gl-native#10944

However, expressions will be available in the next release, so it might be worth spending much effort accommodating functions in the meantime.

I'd prefer merging this PR and fixing this in a different branch in the future when we switch to 6.0.0.

@cammace Is there a ticket in this repo where we're tracking this tail work?

I ticketed this out in #301

langsmith requested a review from zugaldia August 7, 2017 19:36

cammace reviewed Aug 30, 2017

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1ec5 reviewed Aug 31, 2017

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1ec5 approved these changes Sep 1, 2017

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zugaldia requested review from osana and removed request for zugaldia December 23, 2017 17:47

osana approved these changes Jan 5, 2018

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langsmith mentioned this pull request Jan 9, 2018

Adding localization plugin example mapbox/mapbox-android-demo#593

Merged

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langsmith added the ready for review When your PR has been personally reviewed, its time for an external contributors to approve label Jan 12, 2018

langsmith self-assigned this Jan 12, 2018

cammace mentioned this pull request Jan 17, 2018

Localize initial map camera position #246

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langsmith removed the ready for review When your PR has been personally reviewed, its time for an external contributors to approve label Feb 5, 2018

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This was referenced Feb 20, 2018

Add expression operators for locale matching (system languages) mapbox/mapbox-gl-js#6197

Open

Automatic label localization should transform non-constant expressions mapbox/mapbox-gl-native#10713

Closed

Basic map localization support added

a65da9c

cammace force-pushed the ls-localization-plugin branch from 9b8a22b to a65da9c Compare February 21, 2018 20:42

Cameron Mace added 2 commits February 21, 2018 15:49

fixed missing junit dependency

c8ef435

use regrex to replace only the part needing change

b228ad5

cammace force-pushed the ls-localization-plugin branch from 9a639ae to b228ad5 Compare February 21, 2018 22:13

cammace merged commit 401b669 into master Feb 21, 2018

cammace deleted the ls-localization-plugin branch February 22, 2018 15:46

1ec5 mentioned this pull request Mar 19, 2018

Localization plugin should transform expressions #374

Closed

		@@ -0,0 +1,3 @@
		<resources>
		<string name="app_name">localization</string>

	if (layer instanceof SymbolLayer) {
	if (((SymbolLayer) layer).getTextField() != null) {
	if (((SymbolLayer) layer).getTextField().getValue() != null &&
	!((SymbolLayer) layer).getTextField().getValue().isEmpty()) {
	if (((SymbolLayer) layer).getTextField().getValue().contains("name")) {
	layer.setProperties(textField(String.format("{name_%s}", getDeviceLanguage())));
	}

	if (((SymbolLayer) layer).getTextField().getValue().contains("abbr") &&
	!getDeviceLanguage().equals("en")) {
	layer.setProperties(textField(String.format("{name_%s}", getDeviceLanguage())));
	}

	&& ((VectorSource) singleSource).getUrl().substring(0, 9).equals("mapbox://")
	&& (((VectorSource) singleSource).getUrl().contains("mapbox.mapbox-streets-v7")
	\|\| ((VectorSource) singleSource).getUrl().contains("mapbox.mapbox-streets-v6"));

	private boolean openStreetMapSupportsLanguage(String languageTag) {
	return languageTag.equals("ar")
	\|\| languageTag.equals("en")
	\|\| languageTag.equals("es")
	\|\| languageTag.equals("fr")
	\|\| languageTag.equals("de")
	\|\| languageTag.equals("pt")
	\|\| languageTag.equals("ru")
	\|\| languageTag.equals("zh")
	\|\| languageTag.equals("zh-Hans");
	}

	public void setMapTextLanguage(String language) {
	if (openStreetMapSupportsLanguage(getDeviceLanguage())) {
	adjustMapTextLayers(language);
	} else if (openStreetMapSupportsLanguage(selectedBackupLanguage)) {
	adjustMapTextLayers(selectedBackupLanguage);
	} else {
	adjustMapTextLayers("en");
	}
	}

Localization plugin #74

Localization plugin #74

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