Added custom module to detect if an app is installed in Android

dapps/v2Explorer/android/app/src/main/java/com/v2explorer/CustomPackage.java

@@ -0,0 +1,29 @@
+package com.v2explorer;
+
+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.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class CustomPackage implements ReactPackage {
+
+    @Override
+    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<NativeModule> createNativeModules(
+            ReactApplicationContext reactContext) {
+        List<NativeModule> modules = new ArrayList<>();
+
+        modules.add(new InstalledAppModule(reactContext));
+
+        return modules;
+    }
+
+}

dapps/v2Explorer/android/app/src/main/java/com/v2explorer/InstalledAppModule.java

@@ -0,0 +1,41 @@
+package com.v2explorer;
+
+import android.content.pm.PackageManager;
+import android.os.Build;
+
+import androidx.annotation.RequiresApi;
+
+import com.facebook.react.bridge.Promise;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+
+// This module will be added to the SDK in the future
+public class InstalledAppModule extends ReactContextBaseJavaModule {
+
+    public InstalledAppModule(ReactApplicationContext reactContext) {
+        super(reactContext);
+    }
+
+    @Override
+    public String getName() {
+        return "InstalledAppModule";
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
+    @ReactMethod
+    public void isAppInstalled(String packageName, Promise promise) {
+        PackageManager packageManager = getReactApplicationContext().getPackageManager();
+
+        try {
+            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+                packageManager.getPackageInfo(packageName, PackageManager.PackageInfoFlags.of(0));
+            } else {
+                packageManager.getPackageInfo(packageName, 0);
+            }
+            promise.resolve(true);
+        } catch (PackageManager.NameNotFoundException e) {
+            promise.resolve(false);
+        }
+    }
+}

dapps/v2Explorer/android/app/src/main/java/com/v2explorer/MainApplication.java

@@ -24,7 +24,7 @@ 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 CustomPackage());
           return packages;
         }
 

dapps/v2Explorer/src/modules/InstalledAppModule.ts

@@ -0,0 +1,26 @@
+/**
+ * This exposes the native CalendarModule module as a JS module. This has a
+ * function 'isAppInstalled' which takes the following parameter:
+ *
+ * 1. String name: A string representing the name of the app
+ * For Android: package name is required (e.g. com.facebook.katana)
+ * For iOS: scheme name is required (e.g. fb://) -> schemes need to be added to info.plist inside LSApplicationQueriesSchemes
+ */
+import {Linking, NativeModules, Platform} from 'react-native';
+
+const {InstalledAppModule} = NativeModules;
+
+interface InstalledAppInterface {
+  isAppInstalled(name: string): Promise<boolean>;
+}
+
+function isAppInstalled(name: string): Promise<boolean> {
+  const isAndroid = Platform.OS === 'android';
+  if (isAndroid) {
+    return InstalledAppModule.isAppInstalled(name);
+  } else {
+    return Linking.canOpenURL(name);
+  }
+}
+
+export default {isAppInstalled} as InstalledAppInterface;