Don't start in fullscreen mode on Android (#3129)

Fixes https://github.com/flutter/flutter/issues/6303

shell/platform/android/io/flutter/plugin/platform/PlatformPlugin.java

@@ -25,15 +25,12 @@ import org.json.JSONObject;
  */
 public class PlatformPlugin extends JSONMessageListener implements ActivityLifecycleListener {
     private final Activity mActivity;
-    private static final int DEFAULT_OVERLAYS = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-            | View.SYSTEM_UI_FLAG_FULLSCREEN
-            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+    public static final int DEFAULT_SYSTEM_UI = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
 
     public PlatformPlugin(Activity activity) {
         mActivity = activity;
-        mEnabledOverlays = DEFAULT_OVERLAYS;
+        mEnabledOverlays = DEFAULT_SYSTEM_UI;
     }
 
     @Override
@@ -130,7 +127,10 @@ public class PlatformPlugin extends JSONMessageListener implements ActivityLifec
     private int mEnabledOverlays;
 
     private void setSystemChromeEnabledSystemUIOverlays(JSONArray overlays) throws JSONException {
-        int enabledOverlays = DEFAULT_OVERLAYS;
+        int enabledOverlays = DEFAULT_SYSTEM_UI
+            | View.SYSTEM_UI_FLAG_FULLSCREEN
+            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
 
          if (overlays.length() == 0) {
              enabledOverlays |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

shell/platform/android/org/domokit/sky/shell/SkyActivity.java

@@ -8,21 +8,13 @@ import android.app.Activity;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
-import android.util.Log;
-import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
-
+import io.flutter.plugin.platform.PlatformPlugin;
 import io.flutter.view.FlutterMain;
 import io.flutter.view.FlutterView;
-
-import org.chromium.base.PathUtils;
-import org.chromium.base.TraceEvent;
-import org.chromium.mojom.sky.EventType;
-import org.chromium.mojom.sky.InputEvent;
-
-import java.io.File;
 import java.util.ArrayList;
+import org.chromium.base.TraceEvent;
 
 
 /**
@@ -60,9 +52,7 @@ public class SkyActivity extends Activity {
             Window window = getWindow();
             window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
             window.setStatusBarColor(0x40000000);
-            window.getDecorView().setSystemUiVisibility(
-                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+            window.getDecorView().setSystemUiVisibility(PlatformPlugin.DEFAULT_SYSTEM_UI);
         }
 
         String[] args = getArgsFromIntent(getIntent());