Remove WRITE_EXTERNAL_STORAGE and CHECK_LICENSE permission and reduce minSdkVersion to version 16

mobile/android/app/build.gradle

@@ -171,11 +171,13 @@ android {
     buildTypes {
         debug {
             signingConfig signingConfigs.debug
+            manifestPlaceholders = [excludeSystemAlertWindowPermission: "false"]
         }
         release {
             minifyEnabled enableProguardInReleaseBuilds
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
             signingConfig signingConfigs.release
+            manifestPlaceholders = [excludeSystemAlertWindowPermission: "true"]
         }
     }
 

mobile/android/app/src/main/AndroidManifest.xml

@@ -5,10 +5,11 @@
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.USE_FINGERPRINT" />
-    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" tools:node="remove"/>
-    <uses-permission android:name="android.permission.READ_PHONE_STATE" tools:node="remove" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" tools:node="remove" />
-
+    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" tools:remove="${excludeSystemAlertWindowPermission}"/>
+    <uses-permission tools:node="remove" android:name="android.permission.READ_PHONE_STATE" />
+    <uses-permission tools:node="remove" android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission tools:node="remove" android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission tools:node="remove" android:name="android.vending.CHECK_LICENSE" />
     <application
       android:name=".MainApplication"
       android:label="@string/app_name"

mobile/android/build.gradle

@@ -34,7 +34,7 @@ allprojects {
 
 ext {
     buildToolsVersion = "28.0.3"
-    minSdkVersion = 21
+    minSdkVersion = 16
     compileSdkVersion = 28
     targetSdkVersion = 28
     def npmVersion = getNpmVersionArray()