Set up export button to export a simple file

android/app/src/main/AndroidManifest.xml

@@ -21,6 +21,16 @@
         </intent-filter>
       </activity>
       <activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />
+      <provider
+            android:name="android.support.v4.content.FileProvider"
+            android:authorities="com.drip.provider"
+            android:grantUriPermissions="true"
+            android:exported="false">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/filepaths" />
+      </provider>
+
     </application>
 
 </manifest>

android/app/src/main/java/com/drip/MainApplication.java

@@ -3,6 +3,8 @@ package com.drip;
 import android.app.Application;
 
 import com.facebook.react.ReactApplication;
+import cl.json.RNSharePackage;
+import cl.json.ShareApplication;
 import io.realm.react.RealmReactPackage;
 import com.horcrux.svg.SvgPackage;
 import com.facebook.react.ReactNativeHost;
@@ -13,7 +15,7 @@ import com.facebook.soloader.SoLoader;
 import java.util.Arrays;
 import java.util.List;
 
-public class MainApplication extends Application implements ReactApplication {
+public class MainApplication extends Application implements ReactApplication, ShareApplication {
 
   private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
     @Override
@@ -25,6 +27,7 @@ public class MainApplication extends Application implements ReactApplication {
     protected List<ReactPackage> getPackages() {
       return Arrays.<ReactPackage>asList(
           new MainReactPackage(),
+            new RNSharePackage(),
             new RealmReactPackage(),
             new SvgPackage()
       );
@@ -46,4 +49,9 @@ public class MainApplication extends Application implements ReactApplication {
     super.onCreate();
     SoLoader.init(this, /* native exopackage */ false);
   }
+
+  @Override
+    public String getFileProviderAuthority() {
+      return "com.drip.provider";
+    }
 }

android/app/src/main/res/xml/filepaths.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+  <paths xmlns:android="http://schemas.android.com/apk/res/android">
+      <external-path name="Downloads" path="Download/" />
+  </paths>