From a6149d3035480e777301aa678b2f8dd7d10d10a7 Mon Sep 17 00:00:00 2001
From: Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>
Date: Fri, 9 Oct 2015 21:58:49 +0200
Subject: make Camera work on lock screen (secure mode)

Change-Id: I2ea9993738430f8c59f9e69cd2f75e6acccdc9eb
---
 AndroidManifest.xml                      |  8 +++++
 src/com/android/camera/ActivityBase.java | 50 +++++++++++++++++++++++++++++++-
 src/com/android/camera/Camera.java       | 29 +++++++++++++++++-
 src/com/android/camera/VideoCamera.java  |  2 +-
 4 files changed, 86 insertions(+), 3 deletions(-)

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index ee57c31..c9023aa 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -45,6 +45,14 @@
                 <action android:name="android.media.action.STILL_IMAGE_CAMERA" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
+	    <intent-filter>
+                <action android:name="android.media.action.IMAGE_CAPTURE_SECURE" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+	    <intent-filter>
+                <action android:name="android.media.action.STILL_IMAGE_CAMERA_SECURE" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
         </activity>
         <activity android:name="com.android.camera.VideoCamera"
                 android:label="@string/video_camera_label"
diff --git a/src/com/android/camera/ActivityBase.java b/src/com/android/camera/ActivityBase.java
index e399421..4a29469 100644
--- a/src/com/android/camera/ActivityBase.java
+++ b/src/com/android/camera/ActivityBase.java
@@ -20,13 +20,16 @@ import com.android.camera.ui.PopupManager;
 
 import android.app.Activity;
 import android.app.KeyguardManager;
+import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.ActivityInfo;
 import android.hardware.Camera;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.KeyEvent;
+import android.view.WindowManager;
 
 /**
  * Superclass of Camera and VideoCamera activities.
@@ -38,6 +41,11 @@ abstract public class ActivityBase extends Activity {
     private boolean mOnResumePending;
     private Intent mResultDataForTesting;
     protected Camera mCameraDevice;
+    // settings for lock screen camera
+    protected static final String INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE =
+            "android.media.action.STILL_IMAGE_CAMERA_SECURE";
+    protected static final String ACTION_IMAGE_CAPTURE_SECURE =
+            "android.media.action.IMAGE_CAPTURE_SECURE";
 
     @Override
     public void onCreate(Bundle icicle) {
@@ -47,6 +55,18 @@ abstract public class ActivityBase extends Activity {
             setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
         }
         super.onCreate(icicle);
+
+	if(isCameraSecure()){
+	    Log.v(TAG, "Starting in secure camera mode.");
+
+	    // show on lock screen
+	    getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+
+	    // Filter for screen off so that we can finish secure camera activity
+	    // when screen is off.
+	    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
+	    registerReceiver(mScreenOffReceiver, filter);
+	}
     }
 
     @Override
@@ -62,6 +82,7 @@ abstract public class ActivityBase extends Activity {
     @Override
     protected void onResume() {
         super.onResume();
+        onResumeAfterSuper();
         // Don't grab the camera if in use by lockscreen. For example, face
         // unlock may be using the camera. Camera may be already opened in
         // onCreate. doOnResume should continue if mCameraDevice != null.
@@ -127,11 +148,14 @@ abstract public class ActivityBase extends Activity {
 
     @Override
     protected void onDestroy() {
+	if (isCameraSecure()) {
+            unregisterReceiver(mScreenOffReceiver);
+        }
         PopupManager.removeInstance(this);
         super.onDestroy();
     }
 
-    private boolean isKeyguardLocked() {
+    protected boolean isKeyguardLocked() {
         KeyguardManager kgm = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
         if (LOGV) {
             if (kgm != null) {
@@ -142,4 +166,28 @@ abstract public class ActivityBase extends Activity {
         // isKeyguardSecure excludes the slide lock case.
         return (kgm != null) && kgm.isKeyguardLocked() && kgm.isKeyguardSecure();
     }
+
+    protected boolean isCameraSecure() {
+        // Check if this is in the secure camera mode.
+	String action = getIntent().getAction();
+	if (INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE.equals(action)
+	     || ACTION_IMAGE_CAPTURE_SECURE.equals(action)){
+	    return true;
+	}
+	else{
+	    return isKeyguardLocked();
+	}
+    }
+
+    // close activity when screen turns off
+    protected BroadcastReceiver mScreenOffReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            Log.v(TAG, "Finishing because screen turned off.");
+            finish();
+        }
+    };
+
+    // implemented in class Camera, class Video needs empty one
+    public void onResumeAfterSuper() {};
 }
diff --git a/src/com/android/camera/Camera.java b/src/com/android/camera/Camera.java
index 2ca7944..f7de7f6 100644
--- a/src/com/android/camera/Camera.java
+++ b/src/com/android/camera/Camera.java
@@ -100,6 +100,10 @@ public class Camera extends ActivityBase implements FocusManager.Listener,
     private static final int SHOW_TAP_TO_FOCUS_TOAST = 6;
     private static final int UPDATE_THUMBNAIL = 7;
 
+    // This is the delay before we execute onResume tasks when coming
+    // from the lock screen, to allow time for onPause to execute.
+    private static final int ON_RESUME_TASKS_DELAY_MSEC = 20;
+
     // The subset of parameters we need to update in setCameraParameters().
     private static final int UPDATE_PARAM_INITIALIZE = 1;
     private static final int UPDATE_PARAM_ZOOM = 2;
@@ -1345,7 +1349,7 @@ public class Camera extends ActivityBase implements FocusManager.Listener,
 
     @OnClickAttr
     public void onThumbnailClicked(View v) {
-        if (isCameraIdle() && mThumbnail != null) {
+        if (isCameraIdle() && mThumbnail != null && !isCameraSecure()) {
             showSharePopup();
         }
     }
@@ -2318,4 +2322,27 @@ public class Camera extends ActivityBase implements FocusManager.Listener,
         mAeLockSupported = mInitialParams.isAutoExposureLockSupported();
         mAwbLockSupported = mInitialParams.isAutoWhiteBalanceLockSupported();
     }
+
+    @Override
+    public void onResumeAfterSuper() {
+        // Add delay on resume from lock screen only, in order to to speed up
+        // the onResume --> onPause --> onResume cycle from lock screen.
+        // Don't do always because letting go of thread can cause delay.
+        String action = getIntent().getAction();
+        if (isCameraSecure()) {
+            Log.v(TAG, "On resume, from lock screen.");
+            // Note: onPauseAfterSuper() will delete this runnable, so we will
+            // at most have 1 copy queued up.
+            mHandler.postDelayed(new Runnable() {
+		    public void run() {
+			doOnResume();
+		    }
+		}, ON_RESUME_TASKS_DELAY_MSEC);
+            // show on lock screen
+	    getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+        } else {
+            Log.v(TAG, "On resume.");
+            doOnResume();
+        }
+    }
 }
diff --git a/src/com/android/camera/VideoCamera.java b/src/com/android/camera/VideoCamera.java
index b2626ed..2190c48 100755
--- a/src/com/android/camera/VideoCamera.java
+++ b/src/com/android/camera/VideoCamera.java
@@ -608,7 +608,7 @@ public class VideoCamera extends ActivityBase
 
     @OnClickAttr
     public void onThumbnailClicked(View v) {
-        if (!mMediaRecorderRecording && mThumbnail != null) {
+        if (!mMediaRecorderRecording && mThumbnail != null && !isCameraSecure()) {
             showSharePopup();
         }
     }
-- 
cgit v1.1