Change Android activity title from JNI call

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1978843002

Review-Url: https://codereview.chromium.org/1978843002

2 files changed, 24 insertions, 0 deletions

diff --git a/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerActivity.java b/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerActivity.java
index e3260c25f7..d6fe710aeb 100644
--- a/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerActivity.java
+++ b/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerActivity.java
@@ -60,6 +60,7 @@ public class ViewerActivity
         setContentView(R.layout.activity_main);
 
         mApplication = (ViewerApplication) getApplication();
+        mApplication.setViewerActivity(this);
         mView = (SurfaceView) findViewById(R.id.surfaceView);
         mView.getHolder().addCallback(this);
 
@@ -67,6 +68,12 @@ public class ViewerActivity
     }
 
     @Override
+    protected void onDestroy() {
+        mApplication.setViewerActivity(null);
+        super.onDestroy();
+    }
+
+    @Override
     public void surfaceCreated(SurfaceHolder holder) {
         if (mApplication.getNativeHandle() != 0) {
             onSurfaceCreated(mApplication.getNativeHandle(), holder.getSurface());
diff --git a/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java b/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
index 9389f72208..4b890bd5e1 100644
--- a/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
+++ b/platform_tools/android/apps/viewer/src/main/java/org/skia/viewer/ViewerApplication.java
@@ -11,6 +11,7 @@ import android.app.Application;
 
 public class ViewerApplication extends Application {
     private long mNativeHandle = 0;
+    private ViewerActivity mViewerActivity;
 
     static {
         System.loadLibrary("skia_android");
@@ -38,4 +39,20 @@ public class ViewerApplication extends Application {
     public long getNativeHandle() {
         return mNativeHandle;
     }
+
+    public void setViewerActivity(ViewerActivity viewerActivity) {
+        this.mViewerActivity = viewerActivity;
+    }
+
+    public void setTitle(String title) {
+        final String finalTitle = title;
+        if (mViewerActivity != null) {
+            mViewerActivity.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    mViewerActivity.setTitle(finalTitle);
+                }
+            });
+        }
+    }
 }