1.fix

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

android/app/src/main/java/com/rnpay/AppUtilsModule.java

@@ -0,0 +1,39 @@
+package com.rnpay;
+
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+
+import androidx.annotation.NonNull;
+
+import com.facebook.react.bridge.Promise;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+
+import java.util.List;
+
+public class AppUtilsModule extends ReactContextBaseJavaModule {
+
+    public AppUtilsModule(ReactApplicationContext reactContext) {
+        super(reactContext);
+    }
+
+    @NonNull
+    @Override
+    public String getName() {
+        return "AppUtilsModule";
+    }
+
+    @ReactMethod
+    public void isModifiedAppInstalled(String scheme, Promise promise) {
+        try {
+            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(scheme + "://check"));
+            PackageManager pm = getReactApplicationContext().getPackageManager();
+            List<android.content.pm.ResolveInfo> list = pm.queryIntentActivities(intent, 0);
+            promise.resolve(list != null && !list.isEmpty());
+        } catch (Exception e) {
+            promise.reject("CHECK_ERROR", e.getMessage(), e);
+        }
+    }
+}

android/app/src/main/java/com/rnpay/AppUtilsPackage.java

@@ -0,0 +1,23 @@
+package com.rnpay;
+
+import com.facebook.react.ReactPackage;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.uimanager.ViewManager;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class AppUtilsPackage implements ReactPackage {
+
+    @Override
+    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
+        return Arrays.<NativeModule>asList(new AppUtilsModule(reactContext));
+    }
+
+    @Override
+    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+        return Collections.emptyList();
+    }
+}

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

@@ -23,8 +23,7 @@ public class MainApplication extends Application implements ReactApplication {
         protected List<ReactPackage> getPackages() {
           @SuppressWarnings("UnnecessaryLocalVariable")
           List<ReactPackage> packages = new PackageList(this).getPackages();
-          // Packages that cannot be autolinked yet can be added manually here, for example:
-          // packages.add(new MyReactNativePackage());
+          packages.add(new AppUtilsPackage());
           return packages;
         }