gradle: restore play runtime detection

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/preference/DonatePreference.kt

@@ -12,8 +12,8 @@ import android.util.AttributeSet
 import android.widget.Toast
 import androidx.preference.Preference
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import com.wireguard.android.BuildConfig
 import com.wireguard.android.R
+import com.wireguard.android.updater.Updater
 import com.wireguard.android.util.ErrorMessages
 
 class DonatePreference(context: Context, attrs: AttributeSet?) : Preference(context, attrs) {
@@ -23,7 +23,7 @@ class DonatePreference(context: Context, attrs: AttributeSet?) : Preference(cont
 
     override fun onClick() {
         /* Google Play Store forbids links to our donation page. */
-        if (BuildConfig.IS_GOOGLE_PLAY) {
+        if (Updater.installerIsGooglePlay(context)) {
             MaterialAlertDialogBuilder(context)
                 .setTitle(R.string.donate_title)
                 .setMessage(R.string.donate_google_play_disappointment)

ui/src/main/java/com/wireguard/android/updater/SnackbarUpdateShower.kt

@@ -88,9 +88,6 @@ object SnackbarUpdateShower {
     }
 
     fun attachToActivity(activity: FragmentActivity, view: View, anchor: View?) {
-        if (BuildConfig.IS_GOOGLE_PLAY)
-            return
-
         val snackbar = SwapableSnackbar(activity, view, anchor)
         val context = activity.applicationContext
 

ui/src/main/java/com/wireguard/android/updater/Updater.kt

@@ -53,6 +53,21 @@ object Updater {
 
     private val updaterScope = CoroutineScope(Job() + Dispatchers.IO)
 
+    private fun installer(context: Context): String = try {
+        val packageName = context.packageName
+        val pm = context.packageManager
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            pm.getInstallSourceInfo(packageName).installingPackageName ?: ""
+        } else {
+            @Suppress("DEPRECATION")
+            pm.getInstallerPackageName(packageName) ?: ""
+        }
+    } catch (_: Throwable) {
+        ""
+    }
+
+    fun installerIsGooglePlay(context: Context): Boolean = installer(context) == "com.android.vending"
+
     sealed class Progress {
         object Complete : Progress()
         class Available(val version: String) : Progress() {
@@ -340,7 +355,7 @@ object Updater {
     }
 
     fun monitorForUpdates() {
-        if (BuildConfig.IS_GOOGLE_PLAY)
+        if (installerIsGooglePlay(Application.get()))
             return
 
         updaterScope.launch {
@@ -382,25 +397,10 @@ object Updater {
 
     class AppUpdatedReceiver : BroadcastReceiver() {
         override fun onReceive(context: Context, intent: Intent) {
-            if (BuildConfig.IS_GOOGLE_PLAY)
-                return
-
             if (intent.action != Intent.ACTION_MY_PACKAGE_REPLACED)
                 return
 
-            val installer = try {
-                val packageName = context.packageName
-                val pm = context.packageManager
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-                    pm.getInstallSourceInfo(packageName).installingPackageName ?: ""
-                } else {
-                    @Suppress("DEPRECATION")
-                    pm.getInstallerPackageName(packageName) ?: ""
-                }
-            } catch (_: Throwable) {
-                ""
-            }
-            if (installer != context.packageName)
+            if (installer(context) != context.packageName)
                 return
 
             /* TODO: does not work because of restrictions placed on broadcast receivers. */