Adding Launcher3 callbacks for trimming memory.

It will help reduce memory footprint of Launcher, when in background.
It is required to help deallocate images, when Google Now Launcher
goes into the background. See cl/83222937/ .

Change-Id: I6d3d4d1f0457c67abcad3ba4516c87abcf666b05

3 files changed, 8 insertions, 0 deletions

diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 5d8e136cd..591eb6474 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -3791,6 +3791,9 @@ public class Launcher extends Activity
             if (mAppsCustomizeTabHost != null) {
                 mAppsCustomizeTabHost.trimMemory();
             }
+            if (mLauncherCallbacks != null) {
+                mLauncherCallbacks.onTrimMemory(level);
+            }
         }
     }
 
diff --git a/src/com/android/launcher3/LauncherCallbacks.java b/src/com/android/launcher3/LauncherCallbacks.java
index a1f4e0b90..d8128d6e5 100644
--- a/src/com/android/launcher3/LauncherCallbacks.java
+++ b/src/com/android/launcher3/LauncherCallbacks.java
@@ -42,6 +42,7 @@ public interface LauncherCallbacks {
     public void dump(String prefix, FileDescriptor fd, PrintWriter w, String[] args);
     public void onHomeIntent();
     public boolean handleBackPressed();
+    public void onTrimMemory(int level);
 
     /*
      * Extension points for providing custom behavior on certain user interactions.
diff --git a/src/com/android/launcher3/LauncherExtension.java b/src/com/android/launcher3/LauncherExtension.java
index b264042cf..fe9bd6c23 100644
--- a/src/com/android/launcher3/LauncherExtension.java
+++ b/src/com/android/launcher3/LauncherExtension.java
@@ -108,6 +108,10 @@ public class LauncherExtension extends Launcher {
         }
 
         @Override
+        public void onTrimMemory(int level) {
+        }
+
+        @Override
         public void onLauncherProviderChange() {
         }