Merge "Switch to showing top-most thumbnail of recent apps." into jb-mr1-dev

8 files changed, 102 insertions, 34 deletions

diff --git a/core/java/android/app/ActivityManager.java b/core/java/android/app/ActivityManager.java
index 06f79e719f70..0eda6b4e090f 100644
--- a/core/java/android/app/ActivityManager.java
+++ b/core/java/android/app/ActivityManager.java
@@ -864,7 +864,17 @@ public class ActivityManager {
             return null;
         }
     }
-    
+
+    /** @hide */
+    public Bitmap getTaskTopThumbnail(int id) throws SecurityException {
+        try {
+            return ActivityManagerNative.getDefault().getTaskTopThumbnail(id);
+        } catch (RemoteException e) {
+            // System dead, we will be dead too soon!
+            return null;
+        }
+    }
+
     /**
      * Flag for {@link #moveTaskToFront(int, int)}: also move the "home"
      * activity along with the task, so it is positioned immediately behind
diff --git a/core/java/android/app/ActivityManagerNative.java b/core/java/android/app/ActivityManagerNative.java
index 773f73cbd1de..8436b2c0b560 100644
--- a/core/java/android/app/ActivityManagerNative.java
+++ b/core/java/android/app/ActivityManagerNative.java
@@ -498,7 +498,7 @@ public abstract class ActivityManagerNative extends Binder implements IActivityM
             reply.writeTypedList(list);
             return true;
         }
-        
+
         case GET_TASK_THUMBNAILS_TRANSACTION: {
             data.enforceInterface(IActivityManager.descriptor);
             int id = data.readInt();
@@ -512,7 +512,21 @@ public abstract class ActivityManagerNative extends Binder implements IActivityM
             }
             return true;
         }
-        
+
+        case GET_TASK_TOP_THUMBNAIL_TRANSACTION: {
+            data.enforceInterface(IActivityManager.descriptor);
+            int id = data.readInt();
+            Bitmap bm = getTaskTopThumbnail(id);
+            reply.writeNoException();
+            if (bm != null) {
+                reply.writeInt(1);
+                bm.writeToParcel(reply, 0);
+            } else {
+                reply.writeInt(0);
+            }
+            return true;
+        }
+
         case GET_SERVICES_TRANSACTION: {
             data.enforceInterface(IActivityManager.descriptor);
             int maxNum = data.readInt();
@@ -2307,6 +2321,21 @@ class ActivityManagerProxy implements IActivityManager
         reply.recycle();
         return bm;
     }
+    public Bitmap getTaskTopThumbnail(int id) throws RemoteException {
+        Parcel data = Parcel.obtain();
+        Parcel reply = Parcel.obtain();
+        data.writeInterfaceToken(IActivityManager.descriptor);
+        data.writeInt(id);
+        mRemote.transact(GET_TASK_TOP_THUMBNAIL_TRANSACTION, data, reply, 0);
+        reply.readException();
+        Bitmap bm = null;
+        if (reply.readInt() != 0) {
+            bm = Bitmap.CREATOR.createFromParcel(reply);
+        }
+        data.recycle();
+        reply.recycle();
+        return bm;
+    }
     public List getServices(int maxNum, int flags) throws RemoteException {
         Parcel data = Parcel.obtain();
         Parcel reply = Parcel.obtain();
diff --git a/core/java/android/app/IActivityManager.java b/core/java/android/app/IActivityManager.java
index 2fb17b64e673..d6ebc9b4ffba 100644
--- a/core/java/android/app/IActivityManager.java
+++ b/core/java/android/app/IActivityManager.java
@@ -104,6 +104,7 @@ public interface IActivityManager extends IInterface {
     public List<ActivityManager.RecentTaskInfo> getRecentTasks(int maxNum,
             int flags, int userId) throws RemoteException;
     public ActivityManager.TaskThumbnails getTaskThumbnails(int taskId) throws RemoteException;
+    public Bitmap getTaskTopThumbnail(int taskId) throws RemoteException;
     public List getServices(int maxNum, int flags) throws RemoteException;
     public List<ActivityManager.ProcessErrorStateInfo> getProcessesInErrorState()
             throws RemoteException;
@@ -548,7 +549,7 @@ public interface IActivityManager extends IInterface {
     int UNBIND_BACKUP_AGENT_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+91;
     int GET_UID_FOR_INTENT_SENDER_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+92;
     int HANDLE_INCOMING_USER_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+93;
-
+    int GET_TASK_TOP_THUMBNAIL_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+94;
     int KILL_APPLICATION_WITH_APPID_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+95;
     int CLOSE_SYSTEM_DIALOGS_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+96;
     int GET_PROCESS_MEMORY_INFO_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+97;
diff --git a/packages/SystemUI/src/com/android/systemui/recent/RecentTasksLoader.java b/packages/SystemUI/src/com/android/systemui/recent/RecentTasksLoader.java
index 6d8435098635..726084484075 100644
--- a/packages/SystemUI/src/com/android/systemui/recent/RecentTasksLoader.java
+++ b/packages/SystemUI/src/com/android/systemui/recent/RecentTasksLoader.java
@@ -193,14 +193,14 @@ public class RecentTasksLoader implements View.OnTouchListener {
         final ActivityManager am = (ActivityManager)
                 mContext.getSystemService(Context.ACTIVITY_SERVICE);
         final PackageManager pm = mContext.getPackageManager();
-        ActivityManager.TaskThumbnails thumbs = am.getTaskThumbnails(td.persistentTaskId);
+        Bitmap thumbnail = am.getTaskTopThumbnail(td.persistentTaskId);
         Drawable icon = getFullResIcon(td.resolveInfo, pm);
 
         if (DEBUG) Log.v(TAG, "Loaded bitmap for task "
-                + td + ": " + thumbs.mainThumbnail);
+                + td + ": " + thumbnail);
         synchronized (td) {
-            if (thumbs != null && thumbs.mainThumbnail != null) {
-                td.setThumbnail(thumbs.mainThumbnail);
+            if (thumbnail != null) {
+                td.setThumbnail(thumbnail);
             } else {
                 td.setThumbnail(mDefaultThumbnailBackground);
             }
diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index 66b60ecb683d..b8c72f81bb5a 100644
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -168,6 +168,7 @@ public final class ActivityManagerService extends ActivityManagerNative
     static final boolean localLOGV = DEBUG;
     static final boolean DEBUG_SWITCH = localLOGV || false;
     static final boolean DEBUG_TASKS = localLOGV || false;
+    static final boolean DEBUG_THUMBNAILS = localLOGV || false;
     static final boolean DEBUG_PAUSE = localLOGV || false;
     static final boolean DEBUG_OOM_ADJ = localLOGV || false;
     static final boolean DEBUG_TRANSITION = localLOGV || false;
@@ -5849,6 +5850,18 @@ public final class ActivityManagerService extends ActivityManagerNative
         return null;
     }
 
+    public Bitmap getTaskTopThumbnail(int id) {
+        synchronized (this) {
+            enforceCallingPermission(android.Manifest.permission.READ_FRAME_BUFFER,
+                    "getTaskTopThumbnail()");
+            TaskRecord tr = taskForIdLocked(id);
+            if (tr != null) {
+                return mMainStack.getTaskTopThumbnailLocked(tr);
+            }
+        }
+        return null;
+    }
+
     public boolean removeSubTask(int taskId, int subTaskIndex) {
         synchronized (this) {
             enforceCallingPermission(android.Manifest.permission.REMOVE_TASKS,
diff --git a/services/java/com/android/server/am/ActivityRecord.java b/services/java/com/android/server/am/ActivityRecord.java
index 009fb5dd6dcc..7ff574838df0 100644
--- a/services/java/com/android/server/am/ActivityRecord.java
+++ b/services/java/com/android/server/am/ActivityRecord.java
@@ -219,7 +219,13 @@ final class ActivityRecord {
         pw.print(prefix); pw.print("frozenBeforeDestroy="); pw.print(frozenBeforeDestroy);
                 pw.print(" thumbnailNeeded="); pw.print(thumbnailNeeded);
                 pw.print(" forceNewConfig="); pw.println(forceNewConfig);
-        pw.print(prefix); pw.print("thumbHolder="); pw.println(thumbHolder);
+        pw.print(prefix); pw.print("thumbHolder: ");
+                pw.print(Integer.toHexString(System.identityHashCode(thumbHolder)));
+                if (thumbHolder != null) {
+                    pw.print(" bm="); pw.print(thumbHolder.lastThumbnail);
+                    pw.print(" desc="); pw.print(thumbHolder.lastDescription);
+                }
+                pw.println();
         if (launchTime != 0 || startTime != 0) {
             pw.print(prefix); pw.print("launchTime=");
                     if (launchTime == 0) pw.print("0");
@@ -674,19 +680,15 @@ final class ActivityRecord {
         }
         if (thumbHolder != null) {
             if (newThumbnail != null) {
+                if (ActivityManagerService.DEBUG_THUMBNAILS) Slog.i(ActivityManagerService.TAG,
+                        "Setting thumbnail of " + this + " holder " + thumbHolder
+                        + " to " + newThumbnail);
                 thumbHolder.lastThumbnail = newThumbnail;
             }
             thumbHolder.lastDescription = description;
         }
     }
 
-    void clearThumbnail() {
-        if (thumbHolder != null) {
-            thumbHolder.lastThumbnail = null;
-            thumbHolder.lastDescription = null;
-        }
-    }
-
     void startLaunchTickingLocked() {
         if (ActivityManagerService.IS_USER_BUILD) {
             return;
diff --git a/services/java/com/android/server/am/ActivityStack.java b/services/java/com/android/server/am/ActivityStack.java
index 29ee0bcfe5a9..df50d898dee7 100755
--- a/services/java/com/android/server/am/ActivityStack.java
+++ b/services/java/com/android/server/am/ActivityStack.java
@@ -1203,8 +1203,7 @@ final class ActivityStack {
         if (mMainStack) {
             mService.reportResumedActivityLocked(next);
         }
-        
-        next.clearThumbnail();
+
         if (mMainStack) {
             mService.setFocusedActivityLocked(next);
         }
@@ -4328,18 +4327,33 @@ final class ActivityStack {
         finishTaskMoveLocked(task);
         return true;
     }
-    
+
     public ActivityManager.TaskThumbnails getTaskThumbnailsLocked(TaskRecord tr) {
         TaskAccessInfo info = getTaskAccessInfoLocked(tr.taskId, true);
         ActivityRecord resumed = mResumedActivity;
         if (resumed != null && resumed.thumbHolder == tr) {
             info.mainThumbnail = resumed.stack.screenshotActivities(resumed);
-        } else {
-            info.mainThumbnail = tr.lastThumbnail;
         }
         return info;
     }
 
+    public Bitmap getTaskTopThumbnailLocked(TaskRecord tr) {
+        ActivityRecord resumed = mResumedActivity;
+        if (resumed != null && resumed.task == tr) {
+            // This task is the current resumed task, we just need to take
+            // a screenshot of it and return that.
+            return resumed.stack.screenshotActivities(resumed);
+        }
+        // Return the information about the task, to figure out the top
+        // thumbnail to return.
+        TaskAccessInfo info = getTaskAccessInfoLocked(tr.taskId, true);
+        if (info.numSubThumbbails <= 0) {
+            return info.mainThumbnail;
+        } else {
+            return info.subtasks.get(info.numSubThumbbails-1).holder.lastThumbnail;
+        }
+    }
+
     public ActivityRecord removeTaskActivitiesLocked(int taskId, int subTaskIndex,
             boolean taskRequired) {
         TaskAccessInfo info = getTaskAccessInfoLocked(taskId, false);
@@ -4370,7 +4384,6 @@ final class ActivityStack {
     }
 
     public TaskAccessInfo getTaskAccessInfoLocked(int taskId, boolean inclThumbs) {
-        ActivityRecord resumed = mResumedActivity;
         final TaskAccessInfo thumbs = new TaskAccessInfo();
         // How many different sub-thumbnails?
         final int NA = mHistory.size();
@@ -4380,6 +4393,10 @@ final class ActivityStack {
             ActivityRecord ar = mHistory.get(j);
             if (!ar.finishing && ar.task.taskId == taskId) {
                 holder = ar.thumbHolder;
+                if (holder != null) {
+                    thumbs.mainThumbnail = holder.lastThumbnail;
+                }
+                j++;
                 break;
             }
             j++;
@@ -4394,7 +4411,6 @@ final class ActivityStack {
 
         ArrayList<TaskAccessInfo.SubTask> subtasks = new ArrayList<TaskAccessInfo.SubTask>();
         thumbs.subtasks = subtasks;
-        ActivityRecord lastActivity = null;
         while (j < NA) {
             ActivityRecord ar = mHistory.get(j);
             j++;
@@ -4404,30 +4420,28 @@ final class ActivityStack {
             if (ar.task.taskId != taskId) {
                 break;
             }
-            lastActivity = ar;
             if (ar.thumbHolder != holder && holder != null) {
                 thumbs.numSubThumbbails++;
                 holder = ar.thumbHolder;
                 TaskAccessInfo.SubTask sub = new TaskAccessInfo.SubTask();
-                sub.thumbnail = holder.lastThumbnail;
+                sub.holder = holder;
                 sub.activity = ar;
                 sub.index = j-1;
                 subtasks.add(sub);
             }
         }
-        if (lastActivity != null && subtasks.size() > 0) {
-            if (resumed == lastActivity) {
-                TaskAccessInfo.SubTask sub = subtasks.get(subtasks.size()-1);
-                sub.thumbnail = lastActivity.stack.screenshotActivities(lastActivity);
-            }
-        }
         if (thumbs.numSubThumbbails > 0) {
             thumbs.retriever = new IThumbnailRetriever.Stub() {
                 public Bitmap getThumbnail(int index) {
                     if (index < 0 || index >= thumbs.subtasks.size()) {
                         return null;
                     }
-                    return thumbs.subtasks.get(index).thumbnail;
+                    TaskAccessInfo.SubTask sub = thumbs.subtasks.get(index);
+                    ActivityRecord resumed = mResumedActivity;
+                    if (resumed != null && resumed.thumbHolder == sub.holder) {
+                        return resumed.stack.screenshotActivities(resumed);
+                    }
+                    return sub.holder.lastThumbnail;
                 }
             };
         }
diff --git a/services/java/com/android/server/am/TaskAccessInfo.java b/services/java/com/android/server/am/TaskAccessInfo.java
index 5618c1aace68..50aeec1172ca 100644
--- a/services/java/com/android/server/am/TaskAccessInfo.java
+++ b/services/java/com/android/server/am/TaskAccessInfo.java
@@ -19,11 +19,10 @@ package com.android.server.am;
 import java.util.ArrayList;
 
 import android.app.ActivityManager.TaskThumbnails;
-import android.graphics.Bitmap;
 
 final class TaskAccessInfo extends TaskThumbnails {
     final static class SubTask {
-        Bitmap thumbnail;
+        ThumbnailHolder holder;
         ActivityRecord activity;
         int index;
     }