Fragment sample test (#1328)

Summary:
Wanted to have a way to test fragment support in open source for https://github.com/facebook/flipper/issues/1209.

Stacked on https://github.com/facebook/flipper/issues/1327.
Pull Request resolved: https://github.com/facebook/flipper/pull/1328

Test Plan: ![Screenshot 2020-07-02 12 10 17](https://user-images.githubusercontent.com/9906/86352544-dc2ae300-bc5d-11ea-91f8-f6b06437f7bc.png)

Reviewed By: jknoxville

Differential Revision: D22356283

Pulled By: passy

fbshipit-source-id: 2ad84df0aae85634c8245e71f18b803ce8dd6ca0

android/sample/AndroidManifest.xml

@@ -47,6 +47,14 @@
         <data android:scheme="flipper" android:host="layout_test_activity" />
       </intent-filter>
     </activity>
+    <activity android:name=".FragmentTestActivity">
+      <intent-filter>
+        <action android:name="android.intent.action.VIEW" />
+        <category android:name="android.intent.category.DEFAULT" />
+        <category android:name="android.intent.category.BROWSABLE" />
+        <data android:scheme="flipper" android:host="fragment_test_activity" />
+      </intent-filter>
+    </activity>
     <activity android:name="com.facebook.flipper.android.diagnostics.FlipperDiagnosticActivity"
         android:exported="true"/>
     <activity android:name="com.facebook.flipper.connectivitytest.ConnectionTestActivity"

android/sample/build.gradle

@@ -50,6 +50,7 @@ dependencies {
     implementation deps.lithoWidget
     implementation deps.lithoAnnotations
     implementation deps.lithoFresco
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     annotationProcessor deps.lithoProcessor
 
     // Third-party

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

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * 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.sample;
+
+import android.os.Bundle;
+import androidx.appcompat.app.AppCompatActivity;
+
+public class FragmentTestActivity extends AppCompatActivity {
+  @Override
+  protected void onCreate(final Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    NavigationFacade.sendNavigationEvent("flipper://fragment_test_activity/");
+    setContentView(com.facebook.flipper.sample.R.layout.fragment_test_activity);
+  }
+}

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

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * 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.sample;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import androidx.fragment.app.Fragment;
+
+public class FragmentTestFragment extends Fragment {
+
+  public FragmentTestFragment() {
+    // Required empty public constructor
+  }
+
+  @Override
+  public View onCreateView(
+      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    return inflater.inflate(R.layout.fragment_test, container, false);
+  }
+}

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

@@ -85,10 +85,17 @@ public class RootComponentSpec {
                 .clickHandler(RootComponent.openAlternateLayoutTestActivity(c)))
         .child(
             Text.create(c)
-                .text("Crash this app")
+                .text("Navigate to fragment test page")
                 .key("8")
                 .marginDip(YogaEdge.ALL, 10)
                 .textSizeSp(20)
+                .clickHandler(RootComponent.openFragmentTestActivity(c)))
+        .child(
+            Text.create(c)
+                .text("Crash this app")
+                .key("9")
+                .marginDip(YogaEdge.ALL, 10)
+                .textSizeSp(20)
                 .clickHandler(RootComponent.triggerCrash(c)))
         .child(
             displayImage
@@ -134,6 +141,12 @@ public class RootComponentSpec {
     c.getAndroidContext().startActivity(intent);
   }
 
+  @OnEvent(ClickEvent.class)
+  static void openFragmentTestActivity(final ComponentContext c) {
+    final Intent intent = new Intent(c.getAndroidContext(), FragmentTestActivity.class);
+    c.getAndroidContext().startActivity(intent);
+  }
+
   @OnEvent(ClickEvent.class)
   static void triggerCrash(final ComponentContext c) {
     throw new RuntimeException("Artificially triggered crash from Flipper sample app");

android/sample/src/main/res/layout/fragment_test.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentTestFragment">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/hello_blank_fragment" />
+
+</FrameLayout>

android/sample/src/main/res/layout/fragment_test_activity.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <fragment
+        android:id="@+id/fragment_test_fragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:name="com.facebook.flipper.sample.FragmentTestFragment"/>
+
+</LinearLayout>

android/sample/src/main/res/values/strings.xml

@@ -9,4 +9,5 @@
 
 <resources>
     <string name="app_name">Flipper</string>
+    <string name="hello_blank_fragment">Hello blank fragment</string>
 </resources>