commit fb9d78afb77b1d304b24f470a637244d52a7e1df
author Jorim Jaggi <jjaggi@google.com> Thu Jan 05 18:57:12 2017 +0100
committer Jorim Jaggi <jjaggi@google.com> Wed Jan 18 01:50:51 2017 +0100
tree 5f44d2bc48f8df4dde0ffece191ab8eaac895dbd
parent 10abe2fe297ce1ec60c15a3bd947757aee5b14b3

Add a listener when task snapshots change

Since we start recents before we take the snapshot, we need to add
a mechanism to inform recents about task snapshots changes.

We add a new method to TaskStackChangedListener,
onTaskSnapshotChanged, which gets called whenever a task snapshot
changes. Then, SystemUI registers such a listener and updates the
task thumbnail view for the specific task.

Test: Open app, press recents, make sure thumbnail is up-to-date
Bug: 31339431
Change-Id: I01e81b9cd11886da734da671c68d5732aa51009f

services/core/java/com/android/server/wm/TaskWindowContainerController.java

diff --git a/services/core/java/com/android/server/wm/TaskWindowContainerController.java b/services/core/java/com/android/server/wm/TaskWindowContainerController.java
index 0e4d048..75b3f3e 100644
--- a/services/core/java/com/android/server/wm/TaskWindowContainerController.java
+++ b/services/core/java/com/android/server/wm/TaskWindowContainerController.java
@@ -18,8 +18,10 @@
 
 import android.app.ActivityManager.TaskSnapshot;
 import android.content.res.Configuration;
-import android.graphics.GraphicBuffer;
 import android.graphics.Rect;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
 import android.util.EventLog;
 import android.util.Slog;
 
@@ -37,14 +39,28 @@
  * Test class: {@link TaskWindowContainerControllerTests}
  */
 public class TaskWindowContainerController
-        extends WindowContainerController<Task, WindowContainerListener> {
+        extends WindowContainerController<Task, TaskWindowContainerListener> {
+
+    private static final int REPORT_SNAPSHOT_CHANGED = 0;
 
     private final int mTaskId;
 
-    public TaskWindowContainerController(int taskId, int stackId, int userId, Rect bounds,
-            Configuration overrideConfig, int resizeMode, boolean homeTask, boolean isOnTopLauncher,
-            boolean toTop, boolean showForAllUsers) {
-        super(null, WindowManagerService.getInstance());
+    private final Handler mHandler = new Handler(Looper.getMainLooper()) {
+
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case REPORT_SNAPSHOT_CHANGED:
+                    mListener.onSnapshotChanged((TaskSnapshot) msg.obj);
+                    break;
+            }
+        }
+    };
+
+    public TaskWindowContainerController(int taskId, TaskWindowContainerListener listener,
+            int stackId, int userId, Rect bounds, Configuration overrideConfig, int resizeMode,
+            boolean homeTask, boolean isOnTopLauncher, boolean toTop, boolean showForAllUsers) {
+        super(listener, WindowManagerService.getInstance());
         mTaskId = taskId;
 
         synchronized(mWindowMap) {
@@ -253,6 +269,10 @@
         }
     }
 
+    void reportSnapshotChanged(TaskSnapshot snapshot) {
+        mHandler.obtainMessage(REPORT_SNAPSHOT_CHANGED, snapshot).sendToTarget();
+    }
+
     @Override
     public String toString() {
         return "{TaskWindowContainerController taskId=" + mTaskId + "}";