Alter In foreground calculation

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog
 
-## TBD
+## 4.X.X (TBD)
+
+### Enhancements
+
+* Alter In foreground calculation
+[#466](https://github.com/bugsnag/bugsnag-android/pull/466)
 
 ### Bug fixes
 

sdk/src/androidTest/java/com/bugsnag/android/AppDataTest.java

@@ -69,7 +69,7 @@ public void testDurationInForeground() {
 
     @Test
     public void testInForeground() {
-        assertFalse((Boolean) appData.get("inForeground"));
+        assertTrue((Boolean) appData.get("inForeground"));
     }
 
     @Test
@@ -85,7 +85,7 @@ public void testJsonSerialisation() throws JSONException {
         assertNotNull(appDataJson.get("buildUUID"));
         assertNotNull(appDataJson.get("duration"));
         assertNotNull(appDataJson.get("durationInForeground"));
-        assertFalse(appDataJson.getBoolean("inForeground"));
+        assertTrue(appDataJson.getBoolean("inForeground"));
     }
 
     @Test

sdk/src/androidTest/java/com/bugsnag/android/SessionTrackerTest.java

@@ -9,6 +9,7 @@
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -97,7 +98,7 @@ public void testIncrementCounts() throws Exception {
 
     @Test
     public void testBasicInForeground() throws Exception {
-        assertFalse(sessionTracker.isInForeground());
+        Assert.assertTrue(sessionTracker.isInForeground());
         assertNull(sessionTracker.getCurrentSession());
         assertNull(sessionTracker.getContextActivity());
 
@@ -114,11 +115,6 @@ public void testBasicInForeground() throws Exception {
         sessionTracker.updateForegroundTracker("other", false, System.currentTimeMillis());
         assertTrue(sessionTracker.isInForeground());
         assertEquals(ACTIVITY_NAME, sessionTracker.getContextActivity());
-
-        sessionTracker.updateForegroundTracker(ACTIVITY_NAME, false, System.currentTimeMillis());
-        assertFalse(sessionTracker.isInForeground());
-        assertEquals(firstSession, sessionTracker.getCurrentSession());
-        assertNull(sessionTracker.getContextActivity());
     }
 
     @Test
@@ -138,9 +134,6 @@ public void testInForegroundDuration() throws Exception {
 
         sessionTracker.updateForegroundTracker(ACTIVITY_NAME, false, now);
         assertEquals(200, sessionTracker.getDurationInForegroundMs(now + 200));
-
-        sessionTracker.updateForegroundTracker(ACTIVITY_NAME, false, now);
-        assertEquals(0, sessionTracker.getDurationInForegroundMs(now + 300));
     }
 
     @Test

sdk/src/main/java/com/bugsnag/android/BlockedThreadDetector.java

@@ -1,15 +1,9 @@
 package com.bugsnag.android;
 
-import android.app.ActivityManager;
-import android.os.Build;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
-import android.os.Process;
 import android.os.SystemClock;
-import android.support.annotation.Nullable;
-
-import java.util.List;
 
 /**
  * Detects whether a given thread is blocked by continuously posting a {@link Runnable} to it
@@ -38,22 +32,22 @@ interface Delegate {
     final Handler watchdogHandler;
     private final HandlerThread watchdogHandlerThread;
     final Delegate delegate;
-    final ActivityManager activityManager;
+    final ForegroundDetector foregroundDetector;
 
     volatile long lastUpdateMs;
     volatile boolean isAlreadyBlocked = false;
 
     BlockedThreadDetector(long blockedThresholdMs,
                           Looper looper,
-                          ActivityManager activityManager,
+                          ForegroundDetector foregroundDetector,
                           Delegate delegate) {
-        this(blockedThresholdMs, MIN_CHECK_INTERVAL_MS, looper, activityManager, delegate);
+        this(blockedThresholdMs, MIN_CHECK_INTERVAL_MS, looper, foregroundDetector, delegate);
     }
 
     BlockedThreadDetector(long blockedThresholdMs,
                           long checkIntervalMs,
                           Looper looper,
-                          ActivityManager activityManager,
+                          ForegroundDetector foregroundDetector,
                           Delegate delegate) {
         if ((blockedThresholdMs <= 0 || checkIntervalMs <= 0
             || looper == null || delegate == null)) {
@@ -64,7 +58,7 @@ interface Delegate {
         this.looper = looper;
         this.delegate = delegate;
         this.uiHandler = new Handler(looper);
-        this.activityManager = activityManager;
+        this.foregroundDetector = foregroundDetector;
 
         watchdogHandlerThread = new HandlerThread("bugsnag-anr-watchdog");
         watchdogHandlerThread.start();
@@ -104,7 +98,7 @@ long calculateNextCheckIn() {
 
     void checkIfThreadBlocked() {
         long delta = SystemClock.uptimeMillis() - lastUpdateMs;
-        boolean inForeground = isInForeground();
+        boolean inForeground = foregroundDetector.isInForeground();
 
         if (inForeground && delta > blockedThresholdMs) {
             if (!isAlreadyBlocked) {
@@ -115,47 +109,4 @@ void checkIfThreadBlocked() {
             isAlreadyBlocked = false;
         }
     }
-
-    private boolean isInForeground() {
-        ActivityManager.RunningAppProcessInfo info = getProcessInfo();
-
-        if (info != null) {
-            return info.importance <= ActivityManager.RunningAppProcessInfo.IMPORTANCE_VISIBLE;
-        } else { // prefer a potential false positive if process info not available
-            return true;
-        }
-    }
-
-    private ActivityManager.RunningAppProcessInfo getProcessInfo() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
-            ActivityManager.RunningAppProcessInfo info =
-                new ActivityManager.RunningAppProcessInfo();
-            ActivityManager.getMyMemoryState(info);
-            return info;
-        } else {
-            return getProcessInfoPreApi16();
-        }
-    }
-
-    @Nullable
-    private ActivityManager.RunningAppProcessInfo getProcessInfoPreApi16() {
-        List<ActivityManager.RunningAppProcessInfo> appProcesses;
-
-        try {
-            appProcesses = activityManager.getRunningAppProcesses();
-        } catch (SecurityException exc) {
-            return null;
-        }
-
-        if (appProcesses != null) {
-            int pid = Process.myPid();
-
-            for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
-                if (pid == appProcess.pid) {
-                    return appProcess;
-                }
-            }
-        }
-        return null;
-    }
 }

sdk/src/main/java/com/bugsnag/android/Client.java

@@ -258,11 +258,9 @@ public void onThreadBlocked(Thread thread) {
             }
         };
 
-        ActivityManager activityManager =
-            (ActivityManager) appContext.getSystemService(Context.ACTIVITY_SERVICE);
-
+        ForegroundDetector foregroundDetector = new ForegroundDetector(appContext);
         BlockedThreadDetector detector =
-            new BlockedThreadDetector(thresholdMs, looper, activityManager, delegate);
+            new BlockedThreadDetector(thresholdMs, looper, foregroundDetector, delegate);
         detector.start(); // begin monitoring for ANRs
     }
 

sdk/src/main/java/com/bugsnag/android/ForegroundDetector.java

@@ -0,0 +1,74 @@
+package com.bugsnag.android;
+
+import android.app.ActivityManager;
+import android.content.Context;
+import android.os.Build;
+import android.os.Process;
+import android.support.annotation.Nullable;
+
+import java.util.List;
+
+class ForegroundDetector {
+
+    private final ActivityManager activityManager;
+
+    ForegroundDetector(Context context) {
+        this.activityManager =
+            (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+    }
+
+    /**
+     * Determines whether or not the application is in the foreground, by using the process'
+     * importance as a proxy.
+     * <p/>
+     * In the unlikely event that information about the process cannot be retrieved, this method
+     * will return true. This is deemed preferable as ANRs are only reported when the application
+     * is in the foreground, and we would rather deliver false-positives than miss true ANRs in
+     * this case. We also need to report 'inForeground' as a boolean value in API calls, and
+     * need to keep the definition of the value consistent throughout the application.
+     *
+     * @return whether the application is in the foreground or not
+     */
+    boolean isInForeground() {
+        ActivityManager.RunningAppProcessInfo info = getProcessInfo();
+
+        if (info != null) {
+            return info.importance <= ActivityManager.RunningAppProcessInfo.IMPORTANCE_VISIBLE;
+        } else { // prefer a potential false positive if process info not available
+            return true;
+        }
+    }
+
+    private ActivityManager.RunningAppProcessInfo getProcessInfo() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+            ActivityManager.RunningAppProcessInfo info =
+                new ActivityManager.RunningAppProcessInfo();
+            ActivityManager.getMyMemoryState(info);
+            return info;
+        } else {
+            return getProcessInfoPreApi16();
+        }
+    }
+
+    @Nullable
+    private ActivityManager.RunningAppProcessInfo getProcessInfoPreApi16() {
+        List<ActivityManager.RunningAppProcessInfo> appProcesses;
+
+        try {
+            appProcesses = activityManager.getRunningAppProcesses();
+        } catch (SecurityException exc) {
+            return null;
+        }
+
+        if (appProcesses != null) {
+            int pid = Process.myPid();
+
+            for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
+                if (pid == appProcess.pid) {
+                    return appProcess;
+                }
+            }
+        }
+        return null;
+    }
+}

sdk/src/main/java/com/bugsnag/android/SessionTracker.java

@@ -44,6 +44,7 @@ class SessionTracker extends Observable implements Application.ActivityLifecycle
     private AtomicLong lastEnteredForegroundMs = new AtomicLong(0);
     private AtomicReference<Session> currentSession = new AtomicReference<>();
     private Semaphore flushingRequest = new Semaphore(1);
+    private final ForegroundDetector foregroundDetector;
 
     SessionTracker(Configuration configuration, Client client, SessionStore sessionStore) {
         this(configuration, client, DEFAULT_TIMEOUT_MS, sessionStore);
@@ -55,6 +56,8 @@ class SessionTracker extends Observable implements Application.ActivityLifecycle
         this.client = client;
         this.timeoutMs = timeoutMs;
         this.sessionStore = sessionStore;
+        this.foregroundDetector = new ForegroundDetector(client.appContext);
+        notifyNdkInForeground();
     }
 
     /**
@@ -390,13 +393,17 @@ void updateForegroundTracker(String activityName, boolean activityStarting, long
             }
         }
         setChanged();
+        notifyNdkInForeground();
+    }
+
+    private void notifyNdkInForeground() {
         notifyObservers(new NativeInterface.Message(
             NativeInterface.MessageType.UPDATE_IN_FOREGROUND,
-            Arrays.asList(!foregroundActivities.isEmpty(), getContextActivity())));
+            Arrays.asList(isInForeground(), getContextActivity())));
     }
 
     boolean isInForeground() {
-        return !foregroundActivities.isEmpty();
+        return foregroundDetector.isInForeground();
     }
 
     //FUTURE:SM This shouldnt be here