Better detecting if current threasd is main thread

Old approach got broken after:
https://googleplex-android-review.googlesource.com/#/c/266421/2

Change-Id: I12ae23efdbaebd8ba24acb1b7eff75c912d24f1d

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/DumpRenderTree/src/com/android/dumprendertree/ReliabilityTestActivity.java b/tests/DumpRenderTree/src/com/android/dumprendertree/ReliabilityTestActivity.java
index 9a4e99ea7bda..22b587fe98e6 100644
--- a/tests/DumpRenderTree/src/com/android/dumprendertree/ReliabilityTestActivity.java
+++ b/tests/DumpRenderTree/src/com/android/dumprendertree/ReliabilityTestActivity.java
@@ -22,6 +22,7 @@ import android.graphics.Bitmap;
 import android.net.http.SslError;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.Looper;
 import android.os.Message;
 import android.util.Log;
 import android.view.ViewGroup;
@@ -184,7 +185,7 @@ public class ReliabilityTestActivity extends Activity {
     }
 
     private final void validateNotAppThread() {
-        if (ActivityThread.currentActivityThread() != null) {
+        if (Looper.myLooper() == Looper.getMainLooper()) {
             throw new RuntimeException(
                 "This method can not be called from the main application thread");
         }