app cold and warm start timing

app

@@ -1 +1 @@
-Subproject commit 601c589f6903a1c33b073b7d72fb4618ecf4a0ef
+Subproject commit 04f1537e7650d238208ea5d790ec0fdd3f4fe0ab

src/main/java/io/lbry/browser/MainActivity.java

@@ -66,6 +66,7 @@ import java.net.URISyntaxException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
@@ -130,8 +131,11 @@ public class MainActivity extends FragmentActivity implements DefaultHardwareBac
         return "LBRYApp";
     }
     
+    public static LaunchTiming CurrentLaunchTiming;
+    
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        CurrentLaunchTiming = new LaunchTiming(new Date());
         super.onCreate(savedInstanceState);
         currentActivity = this;
 
@@ -149,6 +153,7 @@ public class MainActivity extends FragmentActivity implements DefaultHardwareBac
         // Start the daemon service if it is not started
         serviceRunning = isServiceRunning(LbrynetService.class);
         if (!serviceRunning) {
+            CurrentLaunchTiming.setColdStart(true);
             ServiceHelper.start(this, "", LbrynetService.class, "lbrynetservice");
         }
 
@@ -845,4 +850,26 @@ public class MainActivity extends FragmentActivity implements DefaultHardwareBac
     public static boolean isGooglePhotosUri(Uri uri) {
         return "com.google.android.apps.photos.content".equals(uri.getAuthority());
     }
+    
+    public static class LaunchTiming {
+        private Date start;
+        private boolean coldStart;
+        
+        public LaunchTiming(Date start) {
+            this.start = start;
+        }
+        
+        public Date getStart() {
+            return start;
+        }
+        public void setStart(Date start) {
+            this.start = start;
+        }
+        public boolean isColdStart() {
+            return coldStart;
+        }
+        public void setColdStart(boolean coldStart) {
+            this.coldStart = coldStart;
+        }
+    }
 }

src/main/java/io/lbry/browser/reactmodules/FirebaseModule.java

@@ -20,6 +20,7 @@ import io.lbry.browser.BuildConfig;
 import io.lbry.browser.MainActivity;
 import io.lbry.browser.Utils;
 
+import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
 import org.json.JSONObject;
@@ -108,4 +109,23 @@ public class FirebaseModule extends ReactContextBaseJavaModule {
                 }
             });
     }
+    
+    @ReactMethod
+    public void logLaunchTiming() {
+        Date end = new Date();
+        MainActivity.LaunchTiming currentTiming = MainActivity.CurrentLaunchTiming;
+        if (currentTiming == null) {
+            // no start timing data, so skip this
+            return;
+        }
+        
+        long totalTimeMs = end.getTime() - currentTiming.getStart().getTime();
+        String eventName = currentTiming.isColdStart() ? "app_cold_start" : "app_warm_start";
+        Bundle bundle = new Bundle();
+        bundle.putLong("total_ms", totalTimeMs);
+        bundle.putLong("total_seconds", new Double(Math.ceil(totalTimeMs / 1000.0)).longValue());
+        if (firebaseAnalytics != null) {
+            firebaseAnalytics.logEvent(eventName, bundle);
+        }
+    }
 }