Call trim/lowMemory in request manager fragments.

Author: sjudd

library/src/androidTest/java/com/bumptech/glide/manager/RequestManagerFragmentTest.java

@@ -2,11 +2,13 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
 import android.app.Activity;
+import android.content.ComponentCallbacks;
 import android.support.v4.app.FragmentActivity;
 
 import com.bumptech.glide.RequestManager;
@@ -103,6 +105,30 @@ public void runTest(Harness harness) {
         });
     }
 
+    @Test
+    public void testCallsRequestManagerOnLowMemory() {
+        runTest(new TestCase() {
+            @Override
+            public void runTest(Harness harness) {
+                RequestManager requestManager = mock(RequestManager.class);
+                harness.setRequestManager(requestManager);
+                harness.getCallbacks().onLowMemory();
+                verify(requestManager).onLowMemory();
+            }
+        });
+    }
+
+    @Test
+    public void testNonSupportFragmentCallsRequestManagerOnTrimMemory() {
+        RequestManagerHarness requestManagerHarness = new RequestManagerHarness();
+        RequestManager requestManager = mock(RequestManager.class);
+        requestManagerHarness.setRequestManager(requestManager);
+        int level = 123;
+        requestManagerHarness.fragment.onTrimMemory(level);
+
+        verify(requestManager).onTrimMemory(eq(level));
+    }
+
     private void runTest(TestCase testCase) {
         for (Harness harness : harnesses) {
             try {
@@ -127,6 +153,8 @@ private interface Harness {
         public ActivityFragmentLifecycle getFragmentLifecycle();
 
         public ActivityController getController();
+
+        public ComponentCallbacks getCallbacks();
     }
 
     private static class RequestManagerHarness implements Harness {
@@ -174,6 +202,11 @@ public ActivityFragmentLifecycle getFragmentLifecycle() {
         public ActivityController getController() {
             return controller;
         }
+
+        @Override
+        public ComponentCallbacks getCallbacks() {
+            return fragment;
+        }
     }
 
     private static class SupportRequestManagerHarness implements Harness {
@@ -222,5 +255,10 @@ public ActivityFragmentLifecycle getFragmentLifecycle() {
         public ActivityController getController() {
             return supportController;
         }
+
+        @Override
+        public ComponentCallbacks getCallbacks() {
+            return supportFragment;
+        }
     }
 }

library/src/main/java/com/bumptech/glide/Glide.java

@@ -346,6 +346,7 @@ public void preFillBitmapPool(PreFillType.Builder... bitmapAttributeBuilders) {
     /**
      * Clears as much memory as possible.
      *
+     * @see android.content.ComponentCallbacks#onLowMemory()
      * @see android.content.ComponentCallbacks2#onLowMemory()
      */
     public void clearMemory() {

library/src/main/java/com/bumptech/glide/RequestManager.java

@@ -1,6 +1,9 @@
 package com.bumptech.glide;
 
+import android.annotation.SuppressLint;
+import android.content.ComponentCallbacks2;
 import android.content.Context;
+import android.content.res.Configuration;
 import android.net.Uri;
 import android.os.Handler;
 import android.os.Looper;
@@ -39,7 +42,9 @@
  * @see Glide#with(android.support.v4.app.Fragment)
  * @see Glide#with(Context)
  */
-public class RequestManager implements LifecycleListener {
+// It's safe to implement ComponentCallbacks2.
+@SuppressLint("NewApi")
+public class RequestManager implements LifecycleListener, ComponentCallbacks2 {
     private final Context context;
     private final Lifecycle lifecycle;
     private final RequestTracker requestTracker;
@@ -78,6 +83,21 @@ public void run() {
         lifecycle.addListener(connectivityMonitor);
     }
 
+    @Override
+    public void onTrimMemory(int level) {
+        glide.trimMemory(level);
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration newConfig) {
+        // Do nothing.
+    }
+
+    @Override
+    public void onLowMemory() {
+        glide.clearMemory();
+    }
+
     /**
      * An interface that allows a default set of options to be applied to all requests started from an
      * {@link com.bumptech.glide.RequestManager}.

library/src/main/java/com/bumptech/glide/manager/RequestManagerFragment.java

@@ -68,4 +68,14 @@ public void onDestroy() {
         super.onDestroy();
         lifecycle.onDestroy();
     }
+
+    @Override
+    public void onTrimMemory(int level) {
+        requestManager.onTrimMemory(level);
+    }
+
+    @Override
+    public void onLowMemory() {
+        requestManager.onLowMemory();
+    }
 }

library/src/main/java/com/bumptech/glide/manager/SupportRequestManagerFragment.java

@@ -65,4 +65,10 @@ public void onDestroy() {
         super.onDestroy();
         lifecycle.onDestroy();
     }
+
+    @Override
+    public void onLowMemory() {
+        super.onLowMemory();
+        requestManager.onLowMemory();
+    }
 }