#13 add an option to force language X

app/src/main/java/com/geeksville/mesh/BaseActivity.kt

@@ -0,0 +1,40 @@
+package com.geeksville.mesh
+
+import android.content.Context
+import android.os.Build
+import androidx.appcompat.app.AppCompatActivity
+import com.geeksville.android.Logging
+import com.geeksville.mesh.model.UIViewModel
+import java.util.*
+
+open class BaseActivity: AppCompatActivity(), Logging {
+
+    override fun attachBaseContext(newBase: Context) {
+        val res = newBase.resources
+        val config = res.configuration
+
+        // get chosen language from preference
+        val prefs = UIViewModel.getPreferences(newBase)
+        val langCode = prefs.getString("lang","zz")
+        debug("langCode is $langCode")
+
+        if (Build.VERSION.SDK_INT >= 17) {
+            val locale = if (langCode == "zz")
+                Locale.getDefault()
+            else
+                Locale(langCode)
+            config.setLocale(locale)
+
+            if(Build.VERSION.SDK_INT > 24) {
+                //Using createNewConfigurationContext will cause CompanionDeviceManager to crash
+                applyOverrideConfiguration(config)
+                super.attachBaseContext(newBase)
+            }else {
+                super.attachBaseContext(newBase.createConfigurationContext(config))
+            }
+        } else {
+            super.attachBaseContext(newBase)
+        }
+    }
+
+}