Camera : allow camera to use power key as shutter

Provides a way for an app to take control of the power key.
Used by the camera to make the power key control the shutter.

Change-Id: I85a1e1761199f4604672be42a3a5005227f5451a
(cherry picked from commit 15661444ae1faea831218f0c936b756de2f0698b)

Prevent power key capture when screen is off

The ability for an activity to capture the power key, which was
added to support power key as shutter in the camera, should only
allow the capture when the screen is on. Otherwise, if an activity
that captures the power key is to the front when the device turns
off, the user will be unable to turn it back on.

Change-Id: Ib119d6914ec72554b404c1cc17eef3a932d5d402

1 files changed, 4 insertions, 0 deletions

diff --git a/core/java/android/view/Window.java b/core/java/android/view/Window.java
index 07984e9..284e12c 100644
--- a/core/java/android/view/Window.java
+++ b/core/java/android/view/Window.java
@@ -843,6 +843,10 @@ public abstract class Window {
     }
 
     private void setPrivateFlags(int flags, int mask) {
+        if ((flags & mask & WindowManager.LayoutParams.PRIVATE_FLAG_PREVENT_POWER_KEY) != 0){
+            mContext.enforceCallingOrSelfPermission("android.permission.PREVENT_POWER_KEY",
+                    "No permission to prevent power key");
+        }
         final WindowManager.LayoutParams attrs = getAttributes();
         attrs.privateFlags = (attrs.privateFlags & ~mask) | (flags & mask);
         dispatchWindowAttributesChanged(attrs);