app: report whether a recording was actually written

MuxRecorder had a Listener interface that nothing implemented; every
callback fired into a no-op. Delete it. stop() now returns whether a
keyframe ever landed and the muxer ran, so Mirror can stop claiming
"recording saved" when no file was written.

1 files changed, 3 insertions, 2 deletions

diff --git a/app/src/main/java/invalid/lena/scrcpy/Session.java b/app/src/main/java/invalid/lena/scrcpy/Session.java
index 019ce80..774fdc1 100644
--- a/app/src/main/java/invalid/lena/scrcpy/Session.java
+++ b/app/src/main/java/invalid/lena/scrcpy/Session.java
@@ -138,9 +138,10 @@ public final class Session {
         r.arm(out);
     }
 
-    public void stopRecording() {
+    // Returns true if a file was actually written (see MuxRecorder.stop).
+    public boolean stopRecording() {
         MuxRecorder r = recorder;
-        if (r != null) r.stop();
+        return r != null && r.stop();
     }
 
     public boolean isRecording() {