Align startup language with system locale in policies app

app/src/main/java/org/openimis/imispolicies/MainActivity.java

@@ -234,6 +234,7 @@ public void onRequestPermissionsResult(int requestCode, @NonNull String[] permis
     protected void onCreate(Bundle savedInstanceState) {
         global = (Global) getApplicationContext();
         super.onCreate(savedInstanceState);
+        new LanguageManager(this).restoreLanguage(false);
         try {
             instance = this;
             setContentView(R.layout.activity_main);
@@ -582,7 +583,7 @@ public void ShowDialogTex2() {
                             finish();
                         });
 
-         alertDialogBuilder.show();
+        alertDialogBuilder.show();
     }
 
     public String getMasterDataText2(String fileName, String password) {
@@ -967,4 +968,4 @@ protected void onDestroy() {
         instance = null;
         super.onDestroy();
     }
-}
+}

app/src/main/java/org/openimis/imispolicies/tools/LanguageManager.java

@@ -70,7 +70,7 @@ public void restoreLanguage() {
      * @param withRestart should the current context be restarted (if it's Activity).
      */
     public void restoreLanguage(boolean withRestart) {
-        String language = getStoredLanguage();
+        String language = resolveStartupLanguage();
         setLanguage(language, withRestart);
     }
 
@@ -184,6 +184,14 @@ private String getStoredLanguage() {
         return global.getStringKey(Global.PREF_LANGUAGE_KEY, defaultLanguage);
     }
 
+    private String resolveStartupLanguage() {
+        String language = getCurrentLocale().getLanguage();
+        if ("fr".equalsIgnoreCase(language)) {
+            return "fr";
+        }
+        return "en";
+    }
+
     /**
      * @return List of supported languages from tblLanguages
      */

app/src/test/java/org/openimis/imispolicies/MainActivityTest.java

@@ -0,0 +1,43 @@
+package org.openimis.imispolicies;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+
+import java.util.Locale;
+
+@RunWith(RobolectricTestRunner.class)
+public class MainActivityTest {
+
+    static class TestActivity extends MainActivity {}
+    private void createActivity() {
+        Robolectric.buildActivity(TestActivity.class)
+                .create()
+                .get();
+    }
+
+    @Test
+    @Config(qualifiers = "fr")
+    public void french_locale_restored() {
+        createActivity();
+        assertEquals("fr", Locale.getDefault().getLanguage());
+    }
+
+    @Test
+    @Config(qualifiers = "en")
+    public void english_locale_restored() {
+        createActivity();
+        assertEquals("en", Locale.getDefault().getLanguage());
+    }
+
+    @Test
+    @Config(qualifiers = "es")
+    public void unsupported_locale_defaults_en() {
+        createActivity();
+        assertEquals("en", Locale.getDefault().getLanguage());
+    }
+}