support uri intent launcher in android

Author: chunhtai

shell/platform/android/io/flutter/embedding/android/FlutterActivity.java

@@ -26,6 +26,7 @@
 import android.graphics.Color;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
+import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.view.View;
@@ -736,8 +737,13 @@ public String getDartEntrypointFunctionName() {
    */
   @NonNull
   public String getInitialRoute() {
-    if (getIntent().hasExtra(EXTRA_INITIAL_ROUTE)) {
-      return getIntent().getStringExtra(EXTRA_INITIAL_ROUTE);
+    Intent intent = getIntent();
+    Uri data = intent.getData();
+    if (data != null && data.getPath() != null && !data.getPath().isEmpty()) {
+      return data.getPath();
+    }
+    if (intent.hasExtra(EXTRA_INITIAL_ROUTE)) {
+      return intent.getStringExtra(EXTRA_INITIAL_ROUTE);
     }
 
     try {

shell/platform/android/test/io/flutter/embedding/android/FlutterActivityTest.java

@@ -10,6 +10,7 @@
 
 import android.content.Context;
 import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -112,6 +113,26 @@ public void itCreatesNewEngineIntentWithRequestedSettings() {
     assertEquals(TransparencyMode.transparent, flutterActivity.getTransparencyMode());
   }
 
+  @Test
+  public void itCreatesNewEngineIntentWithLaunchUri() {
+    Intent intent = FlutterActivity.createDefaultIntent(RuntimeEnvironment.application);
+    intent.setData(Uri.parse("http://myApp/custom/route"));
+    ActivityController<FlutterActivity> activityController =
+        Robolectric.buildActivity(FlutterActivity.class, intent);
+    FlutterActivity flutterActivity = activityController.get();
+    flutterActivity.setDelegate(new FlutterActivityAndFragmentDelegate(flutterActivity));
+
+    assertEquals("main", flutterActivity.getDartEntrypointFunctionName());
+    assertEquals("/custom/route", flutterActivity.getInitialRoute());
+    assertArrayEquals(new String[] {}, flutterActivity.getFlutterShellArgs().toArray());
+    assertTrue(flutterActivity.shouldAttachEngineToActivity());
+    assertNull(flutterActivity.getCachedEngineId());
+    assertTrue(flutterActivity.shouldDestroyEngineWithHost());
+    assertEquals(BackgroundMode.opaque, flutterActivity.getBackgroundMode());
+    assertEquals(RenderMode.surface, flutterActivity.getRenderMode());
+    assertEquals(TransparencyMode.opaque, flutterActivity.getTransparencyMode());
+  }
+
   @Test
   public void itCreatesCachedEngineIntentThatDoesNotDestroyTheEngine() {
     Intent intent =