Preload overview activity in background

To reduce the jank when swiping-up the overview which is not
ready yet, we restart the overview activity if the process
was died and update its configuration if there is change.

Bug: 127350205
Test: manual - Enable 2-button or gesture navigation.
      Swipe-up overview after:
      Case 1: Other app is in foreground and kill the process
              of launcher.
      Case 2: Change configuration, e.g. font size, language.

Change-Id: Ia6e365cc0faf3765781484d040bdddd4e10a2650

1 files changed, 63 insertions, 28 deletions

diff --git a/quickstep/src/com/android/quickstep/OverviewComponentObserver.java b/quickstep/src/com/android/quickstep/OverviewComponentObserver.java
index 0738affa9..4a2ed3a3d 100644
--- a/quickstep/src/com/android/quickstep/OverviewComponentObserver.java
+++ b/quickstep/src/com/android/quickstep/OverviewComponentObserver.java
@@ -29,11 +29,15 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.util.SparseIntArray;
 
 import com.android.systemui.shared.system.PackageManagerWrapper;
 
 import java.util.ArrayList;
+import java.util.Objects;
 
 /**
  * Class to keep track of the current overview component based off user preferences and app updates
@@ -53,22 +57,41 @@ public final class OverviewComponentObserver {
         }
     };
     private final Context mContext;
-    private final ComponentName mMyHomeComponent;
+    private final Intent mCurrentHomeIntent;
+    private final Intent mMyHomeIntent;
+    private final Intent mFallbackIntent;
+    private final SparseIntArray mConfigChangesMap = new SparseIntArray();
     private String mUpdateRegisteredPackage;
     private ActivityControlHelper mActivityControlHelper;
     private Intent mOverviewIntent;
-    private Intent mHomeIntent;
     private int mSystemUiStateFlags;
     private boolean mIsHomeAndOverviewSame;
+    private boolean mIsDefaultHome;
 
     public OverviewComponentObserver(Context context) {
         mContext = context;
 
-        Intent myHomeIntent = new Intent(Intent.ACTION_MAIN)
+        mCurrentHomeIntent = new Intent(Intent.ACTION_MAIN)
                 .addCategory(Intent.CATEGORY_HOME)
-                .setPackage(mContext.getPackageName());
-        ResolveInfo info = context.getPackageManager().resolveActivity(myHomeIntent, 0);
-        mMyHomeComponent = new ComponentName(context.getPackageName(), info.activityInfo.name);
+                .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        mMyHomeIntent = new Intent(mCurrentHomeIntent).setPackage(mContext.getPackageName());
+        ResolveInfo info = context.getPackageManager().resolveActivity(mMyHomeIntent, 0);
+        ComponentName myHomeComponent =
+                new ComponentName(context.getPackageName(), info.activityInfo.name);
+        mMyHomeIntent.setComponent(myHomeComponent);
+        mConfigChangesMap.append(myHomeComponent.hashCode(), info.activityInfo.configChanges);
+
+        ComponentName fallbackComponent = new ComponentName(mContext, RecentsActivity.class);
+        mFallbackIntent = new Intent(Intent.ACTION_MAIN)
+                .addCategory(Intent.CATEGORY_DEFAULT)
+                .setComponent(fallbackComponent)
+                .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+        try {
+            ActivityInfo fallbackInfo = context.getPackageManager().getActivityInfo(
+                    mFallbackIntent.getComponent(), 0 /* flags */);
+            mConfigChangesMap.append(fallbackComponent.hashCode(), fallbackInfo.configChanges);
+        } catch (PackageManager.NameNotFoundException ignored) { /* Impossible */ }
 
         mContext.registerReceiver(mUserPreferenceChangeReceiver,
                 new IntentFilter(ACTION_PREFERRED_ACTIVITY_CHANGED));
@@ -92,17 +115,14 @@ public final class OverviewComponentObserver {
         ComponentName defaultHome = PackageManagerWrapper.getInstance()
                 .getHomeActivities(new ArrayList<>());
 
-        final String overviewIntentCategory;
-        ComponentName overviewComponent;
-        mHomeIntent = null;
-
-        if ((mSystemUiStateFlags & SYSUI_STATE_HOME_DISABLED) == 0 &&
-                (defaultHome == null || mMyHomeComponent.equals(defaultHome))) {
+        mIsDefaultHome = Objects.equals(mMyHomeIntent.getComponent(), defaultHome);
+        if ((mSystemUiStateFlags & SYSUI_STATE_HOME_DISABLED) == 0
+                && (defaultHome == null || mIsDefaultHome)) {
             // User default home is same as out home app. Use Overview integrated in Launcher.
-            overviewComponent = mMyHomeComponent;
             mActivityControlHelper = new LauncherActivityControllerHelper();
             mIsHomeAndOverviewSame = true;
-            overviewIntentCategory = Intent.CATEGORY_HOME;
+            mOverviewIntent = mMyHomeIntent;
+            mCurrentHomeIntent.setComponent(mMyHomeIntent.getComponent());
 
             if (mUpdateRegisteredPackage != null) {
                 // Remove any update listener as we don't care about other packages.
@@ -111,14 +131,11 @@ public final class OverviewComponentObserver {
             }
         } else {
             // The default home app is a different launcher. Use the fallback Overview instead.
-            overviewComponent = new ComponentName(mContext, RecentsActivity.class);
             mActivityControlHelper = new FallbackActivityControllerHelper();
             mIsHomeAndOverviewSame = false;
-            overviewIntentCategory = Intent.CATEGORY_DEFAULT;
+            mOverviewIntent = mFallbackIntent;
+            mCurrentHomeIntent.setComponent(defaultHome);
 
-            mHomeIntent = new Intent(Intent.ACTION_MAIN)
-                    .addCategory(Intent.CATEGORY_HOME)
-                    .setComponent(defaultHome);
             // User's default home app can change as a result of package updates of this app (such
             // as uninstalling the app or removing the "Launcher" feature in an update).
             // Listen for package updates of this app (and remove any previously attached
@@ -138,14 +155,6 @@ public final class OverviewComponentObserver {
                         ACTION_PACKAGE_REMOVED));
             }
         }
-
-        mOverviewIntent = new Intent(Intent.ACTION_MAIN)
-                .addCategory(overviewIntentCategory)
-                .setComponent(overviewComponent)
-                .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        if (mHomeIntent == null) {
-            mHomeIntent = mOverviewIntent;
-        }
     }
 
     /**
@@ -161,6 +170,32 @@ public final class OverviewComponentObserver {
     }
 
     /**
+     * @return {@code true} if the overview component is able to handle the configuration changes.
+     */
+    boolean canHandleConfigChanges(ComponentName component, int changes) {
+        final int orientationChange =
+                ActivityInfo.CONFIG_ORIENTATION | ActivityInfo.CONFIG_SCREEN_SIZE;
+        if ((changes & orientationChange) == orientationChange) {
+            // This is just an approximate guess for simple orientation change because the changes
+            // may contain non-public bits (e.g. window configuration).
+            return true;
+        }
+
+        int configMask = mConfigChangesMap.get(component.hashCode());
+        return configMask != 0 && (~configMask & changes) == 0;
+    }
+
+    /**
+     * Get the intent for overview activity. It is used when lockscreen is shown and home was died
+     * in background, we still want to restart the one that will be used after unlock.
+     *
+     * @return the overview intent
+     */
+    Intent getOverviewIntentIgnoreSysUiState() {
+        return mIsDefaultHome ? mMyHomeIntent : mOverviewIntent;
+    }
+
+    /**
      * Get the current intent for going to the overview activity.
      *
      * @return the overview intent
@@ -173,7 +208,7 @@ public final class OverviewComponentObserver {
      * Get the current intent for going to the home activity.
      */
     public Intent getHomeIntent() {
-        return mHomeIntent;
+        return mCurrentHomeIntent;
     }
 
     /**