Add activity for connectivity test

Summary:
This is quite hacky, but allows us to test that a plugin connects, sends some actions and
then shuts down the app which we can use in a headless test.

Reviewed By: jknoxville

Differential Revision: D14482381

fbshipit-source-id: deafa8fa7e6d5a5ca1bb006e9d150b62295105af

android/sample/AndroidManifest.xml

@@ -21,6 +21,8 @@
     </activity>
     <activity android:name="com.facebook.flipper.android.diagnostics.FlipperDiagnosticActivity"
         android:exported="true"/>
+    <activity android:name="com.facebook.flipper.connectivitytest.ConnectionTestActivity"
+        android:exported="true"/>
   </application>
 
 </manifest>

android/sample/src/main/java/com/facebook/flipper/connectivitytest/ConnectionTestActivity.java

@@ -0,0 +1,37 @@
+package com.facebook.flipper.connectivitytest;
+
+import android.os.Bundle;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import com.facebook.flipper.android.AndroidFlipperClient;
+import com.facebook.flipper.core.FlipperClient;
+import com.facebook.flipper.plugins.example.ExampleFlipperPlugin;
+import com.facebook.flipper.sample.RootComponent;
+import com.facebook.litho.ComponentContext;
+import com.facebook.litho.LithoView;
+
+/**
+ * Oh hai! This is probably not the kinda sample you want to copy to your application; we're just
+ * using this to drive a test run and exit the app afterwards.
+ */
+public class ConnectionTestActivity extends AppCompatActivity {
+
+  @Override
+  protected void onCreate(@Nullable Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+
+    final ComponentContext c = new ComponentContext(this);
+    setContentView(LithoView.create(c, RootComponent.create(c).build()));
+
+    final FlipperClient client = AndroidFlipperClient.getInstanceIfInitialized();
+    if (client != null) {
+      // As we're re-using the identifier, get rid of the default plugin first.
+      final ExampleFlipperPlugin exampleFlipperPlugin =
+          client.getPluginByClass(ExampleFlipperPlugin.class);
+      client.removePlugin(exampleFlipperPlugin);
+
+      final ConnectionTestPlugin connectionTestPlugin = new ConnectionTestPlugin(this);
+      client.addPlugin(connectionTestPlugin);
+    }
+  }
+}

android/sample/src/main/java/com/facebook/flipper/connectivitytest/ConnectionTestPlugin.java

@@ -0,0 +1,84 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+package com.facebook.flipper.connectivitytest;
+
+import android.app.Activity;
+import android.widget.Toast;
+import androidx.annotation.Nullable;
+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.flipper.sample.ExampleActions;
+
+public class ConnectionTestPlugin implements FlipperPlugin {
+
+  // We are reusing the existing "Example" logic here. That's generally a pretty bad idea,
+  // but in war and in testing everything is fair.
+  private static final String ID = "Example";
+
+  private final Activity mActivity;
+
+  @Nullable private FlipperConnection mConnection;
+
+  public ConnectionTestPlugin(Activity activity) {
+    mActivity = activity;
+  }
+
+  @Override
+  public String getId() {
+    return ID;
+  }
+
+  @Override
+  public void onConnect(FlipperConnection connection) {
+    mConnection = connection;
+    connection.receive(
+        "displayMessage",
+        new FlipperReceiver() {
+          @Override
+          public void onReceive(final FlipperObject params, FlipperResponder responder) {
+            if (mActivity != null) {
+              mActivity.runOnUiThread(
+                  new Runnable() {
+                    @Override
+                    public void run() {
+                      Toast.makeText(mActivity, params.getString("message"), Toast.LENGTH_SHORT)
+                          .show();
+                    }
+                  });
+            }
+
+            responder.success(new FlipperObject.Builder().put("greeting", "Hello").build());
+          }
+        });
+
+    mActivity.runOnUiThread(
+        new Runnable() {
+          @Override
+          public void run() {
+            ExampleActions.sendGetRequest();
+            ExampleActions.sendPostRequest();
+            // We want Flipper to properly disconnect at this point and actually shut down the app.
+            mActivity.finish();
+            android.os.Process.sendSignal(android.os.Process.myPid(), 15);
+          }
+        });
+  }
+
+  @Override
+  public void onDisconnect() {
+    mConnection = null;
+  }
+
+  @Override
+  public boolean runInBackground() {
+    return true;
+  }
+}

android/sample/src/main/java/com/facebook/flipper/sample/ExampleActions.java

@@ -12,9 +12,9 @@ import okhttp3.Request;
 import okhttp3.RequestBody;
 import okhttp3.Response;
 
-final class ExampleActions {
+public final class ExampleActions {
 
-  static void sendPostRequest() {
+  public static void sendPostRequest() {
     final RequestBody formBody =
         new FormBody.Builder().add("app", "Flipper").add("remarks", "Its awesome").build();
 
@@ -45,7 +45,7 @@ final class ExampleActions {
             });
   }
 
-  static void sendGetRequest() {
+  public static void sendGetRequest() {
     final Request request =
         new Request.Builder().url("https://api.github.com/repos/facebook/yoga").get().build();
     FlipperSampleApplication.sOkHttpClient
@@ -69,7 +69,7 @@ final class ExampleActions {
             });
   }
 
-  static void sendNotification() {
+  public static void sendNotification() {
     final FlipperClient client = AndroidFlipperClient.getInstanceIfInitialized();
     if (client != null) {
       final ExampleFlipperPlugin plugin = client.getPluginByClass(ExampleFlipperPlugin.class);

android/sample/src/main/java/com/facebook/flipper/sample/MainActivity.java

@@ -28,12 +28,5 @@ public class MainActivity extends AppCompatActivity {
       final ExampleFlipperPlugin samplePlugin = client.getPluginByClass(ExampleFlipperPlugin.class);
       samplePlugin.setActivity(this);
     }
-
-    if (getIntent().getBooleanExtra("NON_INTERACTIVE_RUN", false)) {
-      ExampleActions.sendGetRequest();
-      ExampleActions.sendPostRequest();
-      ExampleActions.sendNotification();
-      finish();
-    }
   }
 }