Work on more low memory reporting to apps.

There are now some new trim memory levels that are sent to
non-background applications as RAM becomes low.

There is a new API for an application to retrieve information
about memory trimming and such on demand.

Fixed various checks against the memory trim level to be
robust (not compare against exact values).

Change-Id: Ifd1c6151124350168aef20a94e517166fd2e03eb

1 files changed, 16 insertions, 20 deletions

diff --git a/core/java/android/view/WindowManagerImpl.java b/core/java/android/view/WindowManagerImpl.java
index d482b35..0e4a30f 100644
--- a/core/java/android/view/WindowManagerImpl.java
+++ b/core/java/android/view/WindowManagerImpl.java
@@ -432,29 +432,25 @@ public class WindowManagerImpl implements WindowManager {
      */
     public void trimMemory(int level) {
         if (HardwareRenderer.isAvailable()) {
-            switch (level) {
-                case ComponentCallbacks2.TRIM_MEMORY_COMPLETE:
-                case ComponentCallbacks2.TRIM_MEMORY_MODERATE:
-                    // On low and medium end gfx devices
-                    if (!ActivityManager.isHighEndGfx(getDefaultDisplay())) {
-                        // Destroy all hardware surfaces and resources associated to
-                        // known windows
-                        synchronized (this) {
-                            if (mViews == null) return;
-                            int count = mViews.length;
-                            for (int i = 0; i < count; i++) {
-                                mRoots[i].terminateHardwareResources();
-                            }
+            // On low and medium end gfx devices
+            if (!ActivityManager.isHighEndGfx(getDefaultDisplay())) {
+                if (level >= ComponentCallbacks2.TRIM_MEMORY_MODERATE) {
+                    // Destroy all hardware surfaces and resources associated to
+                    // known windows
+                    synchronized (this) {
+                        if (mViews == null) return;
+                        int count = mViews.length;
+                        for (int i = 0; i < count; i++) {
+                            mRoots[i].terminateHardwareResources();
                         }
-                        // Force a full memory flush
-                        HardwareRenderer.trimMemory(ComponentCallbacks2.TRIM_MEMORY_COMPLETE);
-                        mNeedsEglTerminate = true;
-                        break;
                     }
-                    // high end gfx devices fall through to next case
-                default:
-                    HardwareRenderer.trimMemory(level);
+                    // Force a full memory flush
+                    HardwareRenderer.trimMemory(ComponentCallbacks2.TRIM_MEMORY_COMPLETE);
+                    mNeedsEglTerminate = true;
+                    return;
+                }
             }
+            HardwareRenderer.trimMemory(level);
         }
     }