feat(native): add expo compatibility for android

README.md

@@ -98,7 +98,7 @@ import tech.bam.rnperformance.flipper.RNPerfMonitorPlugin;
 
 ...
 
-client.addPlugin(new RNPerfMonitorPlugin(reactInstanceManager));
+client.addPlugin(new RNPerfMonitorPlugin());
 ```
 
 #### Migrating from flipper-plugin-rn-performance-android

flipper-native/android/src/debug/java/tech/bam/rnperformance/flipper/RNPerfMonitorPlugin.java

@@ -4,23 +4,46 @@
 import android.os.Looper;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+
+import com.facebook.flipper.android.AndroidFlipperClient;
 import com.facebook.flipper.core.FlipperConnection;
 import com.facebook.flipper.core.FlipperObject;
 import com.facebook.flipper.core.FlipperPlugin;
 import com.facebook.flipper.core.FlipperReceiver;
 import com.facebook.flipper.core.FlipperResponder;
 import com.facebook.react.ReactInstanceManager;
+import com.facebook.react.bridge.ReactApplicationContext;
 
 public class RNPerfMonitorPlugin implements FlipperPlugin {
     private FlipperConnection connection;
-    private ReactInstanceManager reactInstanceManager;
     private FPSMonitor fpsMonitor;
+    private ReactApplicationContext reactContext;
+
+    public static void passReactApplicationContext(@NonNull ReactApplicationContext reactContext) {
+		final RNPerfMonitorPlugin plugin = AndroidFlipperClient.getInstance(reactContext.getBaseContext())
+				.getPluginByClass(RNPerfMonitorPlugin.class);
 
+		if (plugin != null) {
+			plugin.setReactContext(reactContext);
+		} else {
+			Log.d(RNPerfMonitorPlugin.class.getName(), "Flipper plugin isn't installed");
+		}
+	}
+
+	// Keeping this constructor for retrocompatibility
+	@Deprecated
     public RNPerfMonitorPlugin(ReactInstanceManager reactInstanceManager) {
-        this.reactInstanceManager = reactInstanceManager;
         fpsMonitor = new FPSMonitor();
     }
 
+	public RNPerfMonitorPlugin() {
+		fpsMonitor = new FPSMonitor();
+	}
+
+    public void setReactContext(@NonNull ReactApplicationContext reactContext) {
+        this.reactContext = reactContext;
+	}
 
     @Override
     public String getId() {
@@ -61,7 +84,7 @@ public void startMeasuring() {
         new Handler(Looper.getMainLooper()).post(new Runnable() {
             @Override
             public void run() {
-                fpsMonitor.start(reactInstanceManager.getCurrentReactContext(), new MonitorCallback() {
+                fpsMonitor.start(reactContext, new MonitorCallback() {
                     @Override
                     public void setCurrentFPS(int uiFrames, int jsFrames, int timeInMs) {
                         if (connection == null) {

flipper-native/android/src/main/java/tech/bam/rnperformance/flipper/FlipperPerformancePluginPackage.java

@@ -7,6 +7,7 @@
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.uimanager.ViewManager;
 
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -17,6 +18,11 @@ public class FlipperPerformancePluginPackage implements ReactPackage {
     public List<NativeModule> createNativeModules(@NonNull ReactApplicationContext reactContext) {
         List<NativeModule> modules = new ArrayList<>();
         modules.add(new FlipperPerformancePluginModule(reactContext));
+
+		if (BuildConfig.DEBUG) {
+			passReactContextToFlipperPlugin(reactContext);
+		}
+
         return modules;
     }
 
@@ -25,4 +31,20 @@ public List<NativeModule> createNativeModules(@NonNull ReactApplicationContext r
     public List<ViewManager> createViewManagers(@NonNull ReactApplicationContext reactContext) {
         return Collections.emptyList();
     }
+
+    private void passReactContextToFlipperPlugin(@NonNull ReactApplicationContext reactContext) {
+		try {
+			/*
+			 We use reflection since Flipper library is not available in release mode
+			 We pass React context here, for compatibility with expo apps
+			 See https://github.com/expo/expo/issues/17852
+			*/
+			Class<?> aClass = Class.forName("tech.bam.rnperformance.flipper.RNPerfMonitorPlugin");
+			aClass
+					.getMethod("passReactApplicationContext", ReactApplicationContext.class)
+					.invoke(null, reactContext);
+		} catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+			e.printStackTrace();
+		}
+	}
 }