Add Camera prewarm intent.

Also adds a test app for testing this intent. In addition, the secure
camera gets launched in the background to fix jank while sending the
intent.

Bug: 20016619
Change-Id: I7bb7e22ddaf5dc67fc09b9e63e5f3d10fe8e3ee4

4 files changed, 85 insertions, 19 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardAffordanceHelper.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardAffordanceHelper.java
index 3b8fccc..cab152f 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardAffordanceHelper.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardAffordanceHelper.java
@@ -69,7 +69,7 @@ public class KeyguardAffordanceHelper {
         @Override
         public void onAnimationEnd(Animator animation) {
             mSwipeAnimator = null;
-            setSwipingInProgress(false);
+            mSwipingInProgress = false;
         }
     };
     private Runnable mAnimationEndRunnable = new Runnable() {
@@ -117,14 +117,17 @@ public class KeyguardAffordanceHelper {
     }
 
     public boolean onTouchEvent(MotionEvent event) {
-        if (mMotionCancelled && event.getActionMasked() != MotionEvent.ACTION_DOWN) {
+        int action = event.getActionMasked();
+        if (mMotionCancelled && action != MotionEvent.ACTION_DOWN
+                && action != MotionEvent.ACTION_UP
+                && action != MotionEvent.ACTION_CANCEL) {
             return false;
         }
         final float y = event.getY();
         final float x = event.getX();
 
         boolean isUp = false;
-        switch (event.getActionMasked()) {
+        switch (action) {
             case MotionEvent.ACTION_DOWN:
                 if (mSwipingInProgress) {
                     cancelAnimation();
@@ -152,7 +155,8 @@ public class KeyguardAffordanceHelper {
                     mInitialTouchY = y;
                     mInitialTouchX = x;
                     mTranslationOnDown = mTranslation;
-                    setSwipingInProgress(true);
+                    mSwipingInProgress = true;
+                    mCallback.onSwipingStarted(w < -mTouchSlop);
                 }
                 if (mSwipingInProgress) {
                     setTranslation(mTranslationOnDown + x - mInitialTouchX, false, false);
@@ -179,13 +183,6 @@ public class KeyguardAffordanceHelper {
         }
     }
 
-    private void setSwipingInProgress(boolean inProgress) {
-        mSwipingInProgress = inProgress;
-        if (inProgress) {
-            mCallback.onSwipingStarted();
-        }
-    }
-
     private boolean rightSwipePossible() {
         return mRightIcon.getVisibility() == View.VISIBLE;
     }
@@ -323,6 +320,9 @@ public class KeyguardAffordanceHelper {
         }
         animator.start();
         mSwipeAnimator = animator;
+        if (snapBack) {
+            mCallback.onSwipingAborted();
+        }
     }
 
     private void startFinishingCircleAnimation(float velocity, Runnable mAnimationEndRunnable) {
@@ -451,7 +451,11 @@ public class KeyguardAffordanceHelper {
             mSwipeAnimator.cancel();
         }
         setTranslation(0.0f, true, animate);
-        setSwipingInProgress(false);
+        mMotionCancelled = true;
+        if (mSwipingInProgress) {
+            mCallback.onSwipingAborted();
+        }
+        mSwipingInProgress = false;
     }
 
     public interface Callback {
@@ -470,7 +474,9 @@ public class KeyguardAffordanceHelper {
 
         float getPageWidth();
 
-        void onSwipingStarted();
+        void onSwipingStarted(boolean isRightwardMotion);
+
+        void onSwipingAborted();
 
         KeyguardAffordanceView getLeftIcon();
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBottomAreaView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBottomAreaView.java
index a247c8e..628ae84 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBottomAreaView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBottomAreaView.java
@@ -100,6 +100,7 @@ public class KeyguardBottomAreaView extends FrameLayout implements View.OnClickL
     private final TrustDrawable mTrustDrawable;
     private final Interpolator mLinearOutSlowInInterpolator;
     private int mLastUnlockIconRes = 0;
+    private boolean mPrewarmSent;
 
     public KeyguardBottomAreaView(Context context) {
         this(context, null);
@@ -335,12 +336,47 @@ public class KeyguardBottomAreaView extends FrameLayout implements View.OnClickL
         mLockPatternUtils.requireCredentialEntry(mLockPatternUtils.getCurrentUser());
     }
 
-    public void launchCamera() {
+    public void prewarmCamera() {
+        Intent intent = getCameraIntent();
+        String targetPackage = PreviewInflater.getTargetPackage(mContext, intent,
+                mLockPatternUtils.getCurrentUser());
+        if (targetPackage != null) {
+            Intent prewarm = new Intent(MediaStore.ACTION_STILL_IMAGE_CAMERA_PREWARM);
+            prewarm.setPackage(targetPackage);
+            mPrewarmSent = true;
+            mContext.sendBroadcast(prewarm);
+        }
+    }
+
+    public void maybeCooldownCamera() {
+        if (!mPrewarmSent) {
+            return;
+        }
+        mPrewarmSent = false;
         Intent intent = getCameraIntent();
+        String targetPackage = PreviewInflater.getTargetPackage(mContext, intent,
+                mLockPatternUtils.getCurrentUser());
+        if (targetPackage != null) {
+            Intent prewarm = new Intent(MediaStore.ACTION_STILL_IMAGE_CAMERA_COOLDOWN);
+            prewarm.setPackage(targetPackage);
+            mContext.sendBroadcast(prewarm);
+        }
+    }
+
+    public void launchCamera() {
+
+        // Reset prewarm state.
+        mPrewarmSent = false;
+        final Intent intent = getCameraIntent();
         boolean wouldLaunchResolverActivity = PreviewInflater.wouldLaunchResolverActivity(
                 mContext, intent, mLockPatternUtils.getCurrentUser());
         if (intent == SECURE_CAMERA_INTENT && !wouldLaunchResolverActivity) {
-            mContext.startActivityAsUser(intent, UserHandle.CURRENT);
+            AsyncTask.execute(new Runnable() {
+                @Override
+                public void run() {
+                    mContext.startActivityAsUser(intent, UserHandle.CURRENT);
+                }
+            });
         } else {
 
             // We need to delay starting the activity because ResolverActivity finishes itself if
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 195da46..216730b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -1809,14 +1809,24 @@ public class NotificationPanelView extends PanelView implements
     }
 
     @Override
-    public void onSwipingStarted() {
-        mSecureCameraLaunchManager.onSwipingStarted();
+    public void onSwipingStarted(boolean isRightwardMotion) {
+        boolean start = getLayoutDirection() == LAYOUT_DIRECTION_RTL ? isRightwardMotion
+                : !isRightwardMotion;
+        if (!start) {
+            mSecureCameraLaunchManager.onSwipingStarted();
+            mKeyguardBottomArea.prewarmCamera();
+        }
         requestDisallowInterceptTouchEvent(true);
         mOnlyAffordanceInThisMotion = true;
         mQsTracking = false;
     }
 
     @Override
+    public void onSwipingAborted() {
+        mKeyguardBottomArea.maybeCooldownCamera();
+    }
+
+    @Override
     public KeyguardAffordanceView getLeftIcon() {
         return getLayoutDirection() == LAYOUT_DIRECTION_RTL
                 ? mKeyguardBottomArea.getCameraView()
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/PreviewInflater.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/PreviewInflater.java
index 34068fd..0dce82f 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/PreviewInflater.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/PreviewInflater.java
@@ -16,6 +16,7 @@
 
 package com.android.systemui.statusbar.policy;
 
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -106,15 +107,28 @@ public class PreviewInflater {
 
     public static boolean wouldLaunchResolverActivity(Context ctx, Intent intent,
             int currentUserId) {
+        return getTargetPackage(ctx, intent, currentUserId) == null;
+    }
+
+    /**
+     * @return the target package of the intent it resolves to a specific package or {@code null} if
+     *         it resolved to the resolver activity
+     */
+    public static String getTargetPackage(Context ctx, Intent intent,
+            int currentUserId) {
         PackageManager packageManager = ctx.getPackageManager();
         final List<ResolveInfo> appList = packageManager.queryIntentActivitiesAsUser(
                 intent, PackageManager.MATCH_DEFAULT_ONLY, currentUserId);
         if (appList.size() == 0) {
-            return false;
+            return null;
         }
         ResolveInfo resolved = packageManager.resolveActivityAsUser(intent,
                 PackageManager.MATCH_DEFAULT_ONLY | PackageManager.GET_META_DATA, currentUserId);
-        return wouldLaunchResolverActivity(resolved, appList);
+        if (resolved == null || wouldLaunchResolverActivity(resolved, appList)) {
+            return null;
+        } else {
+            return resolved.activityInfo.packageName;
+        }
     }
 
     private static boolean wouldLaunchResolverActivity(