判断topActivity逻辑优化。

app/src/main/java/com/youbay/daemon/DaemonService.java

@@ -9,6 +9,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
 import android.os.IBinder;
+import android.text.TextUtils;
 import android.util.Log;
 
 import java.util.concurrent.Executors;
@@ -96,9 +97,9 @@ public class DaemonService extends Service {
         String result = ApkUtil.execSuCmd1("dumpsys activity | grep \"mResumedActivity\"");
         int start = result.indexOf("u0") + 3;
         int end = result.indexOf("/");
-        Log.d(TAG, "s: " + start + " end:" + end + " result:" + result);
-        if (start < 0 || end < 0 || end <= start) {
-            return false;
+
+        if (TextUtils.isEmpty(result) || start < 0 || end < 0 || end <= start) {
+            return true;
         }
         //Log.d(TAG, "s: " + start + " end:" + end + " result:" + result);
         String top = result.substring(start, end);