Show the file path of the exported output video.

PiperOrigin-RevId: 535233266
(cherry picked from commit 02698a8a4c169546c17c20c8336a05470b957da7)

demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/TransformerActivity.java

@@ -660,7 +660,7 @@ public final class TransformerActivity extends AppCompatActivity {
   private void onCompleted(Uri inputUri, String filePath) {
     exportStopwatch.stop();
     informationTextView.setText(
-        getString(R.string.export_completed, exportStopwatch.elapsed(TimeUnit.SECONDS)));
+        getString(R.string.export_completed, exportStopwatch.elapsed(TimeUnit.SECONDS), filePath));
     progressViewGroup.setVisibility(View.GONE);
     debugFrame.removeAllViews();
     inputCardView.setVisibility(View.VISIBLE);

demos/transformer/src/main/res/values/strings.xml

@@ -42,7 +42,7 @@
   <string name="debug_preview_not_available" translatable="false">No debug preview available.</string>
   <string name="export_started" translatable="false">Export started</string>
   <string name="export_timer" translatable="false">Export started %d seconds ago.</string>
-  <string name="export_completed" translatable="false">Export completed in %d seconds.</string>
+  <string name="export_completed" translatable="false">Export completed in %d seconds.\nOutput: %s</string>
   <string name="export_error" translatable="false">Export error</string>
   <string name="trim_range">Bounds in seconds</string>
   <string-array name="color_filter_options">