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/BrowserPowerTest/src/com/android/browserpowertest/PowerTestActivity.java b/tests/BrowserPowerTest/src/com/android/browserpowertest/PowerTestActivity.java
index 1b72486..ab60f21 100644
--- a/tests/BrowserPowerTest/src/com/android/browserpowertest/PowerTestActivity.java
+++ b/tests/BrowserPowerTest/src/com/android/browserpowertest/PowerTestActivity.java
@@ -21,6 +21,7 @@ import android.app.ActivityThread;
 import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.Looper;
 import android.os.Message;
 import android.util.Log;
 import android.view.ViewGroup;
@@ -180,7 +181,7 @@ public class PowerTestActivity 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");
         }