SnapdragonCamera: Fix NPE in camera open if UI creation takes time.

Sometimes null pointer exception is seen because open camera thread
might try to access photo UI though its not created by that time,
due to some timing issues. So, let focus manager initialize without
photo UI and later update it when photo UI is ready.

Change-Id: I7b4c344586115e45269483a614de1e91e1a6ab81

2 files changed, 37 insertions, 9 deletions

diff --git a/src/com/android/camera/FocusOverlayManager.java b/src/com/android/camera/FocusOverlayManager.java
index 5efbf0178..c5ffef5c5 100644
--- a/src/com/android/camera/FocusOverlayManager.java
+++ b/src/com/android/camera/FocusOverlayManager.java
@@ -146,6 +146,10 @@ public class FocusOverlayManager {
         mUI = ui;
     }
 
+    public void setPhotoUI(FocusUI ui) {
+        mUI = ui;
+    }
+
     public void setParameters(Parameters parameters) {
         // parameters can only be null when onConfigurationChanged is called
         // before camera is open. We will just return in this case, because
@@ -530,7 +534,9 @@ public class FocusOverlayManager {
         if (!mInitialized) return;
 
         // Put focus indicator to the center. clear reset position
-        mUI.clearFocus();
+        if (mUI != null) {
+            mUI.clearFocus();
+        }
         // Initialize mFocusArea.
         mFocusArea = null;
         // Initialize mMeteringArea.
diff --git a/src/com/android/camera/PhotoModule.java b/src/com/android/camera/PhotoModule.java
index 823cba69d..44e961e95 100644
--- a/src/com/android/camera/PhotoModule.java
+++ b/src/com/android/camera/PhotoModule.java
@@ -586,7 +586,7 @@ public class PhotoModule
             return;
         }
         Log.v(TAG, "onPreviewUIReady");
-        if (mCameraState == PREVIEW_STOPPED) {
+        if (mCameraState == PREVIEW_STOPPED || mCameraState == INIT) {
             startPreview();
         } else {
             SurfaceTexture st = mUI.getSurfaceTexture();
@@ -624,6 +624,7 @@ public class PhotoModule
         Log.v(TAG, "onCameraOpened");
         openCameraCommon();
         resizeForPreviewAspectRatio();
+        updateFocusManager(mUI);
     }
 
     private void switchCamera() {
@@ -2210,12 +2211,22 @@ public class PhotoModule
                     mInitialParams, this, mMirror,
                     mActivity.getMainLooper(), mUI);
         }
-        View root = mUI.getRootView();
-        // These depend on camera parameters.
+    }
+
+    private void updateFocusManager(PhotoUI mUI) {
+        // Idea here is to let focus manager create in camera open thread
+        // (in initializeFocusManager) even if photoUI is null by that time so
+        // as to not block start preview process. Once UI creation is done,
+        // we will update focus manager with proper UI.
+        if (mFocusManager != null && mUI != null) {
+            mFocusManager.setPhotoUI(mUI);
 
-        int width = root.getWidth();
-        int height = root.getHeight();
-        mFocusManager.setPreviewSize(width, height);
+            View root = mUI.getRootView();
+            // These depend on camera parameters.
+            int width = root.getWidth();
+            int height = root.getHeight();
+            mFocusManager.setPreviewSize(width, height);
+        }
     }
 
     @Override
@@ -2423,7 +2434,11 @@ public class PhotoModule
         mDisplayRotation = CameraUtil.getDisplayRotation(mActivity);
         mDisplayOrientation = CameraUtil.getDisplayOrientation(mDisplayRotation, mCameraId);
         mCameraDisplayOrientation = mDisplayOrientation;
-        mUI.setDisplayOrientation(mDisplayOrientation);
+        // This will be called again in checkDisplayRotation(), so there
+        // should not be any problem even if mUI is null.
+        if (mUI != null) {
+            mUI.setDisplayOrientation(mDisplayOrientation);
+        }
         if (mFocusManager != null) {
             mFocusManager.setDisplayOrientation(mDisplayOrientation);
         }
@@ -2448,7 +2463,14 @@ public class PhotoModule
 
         Log.v(TAG, "startPreview");
 
-        SurfaceTexture st = mUI.getSurfaceTexture();
+        SurfaceTexture st = null;
+        if (mUI != null) {
+            st = mUI.getSurfaceTexture();
+        }
+        // Surfacetexture could be null here, but its still valid and safe to set null
+        // surface before startpreview. This will help in basic preview setup and
+        // surface creation in parallel. Once valid surface is ready in onPreviewUIReady()
+        // we set the surface to camera to actually start preview.
         mCameraDevice.setPreviewTexture(st);
 
         if (!mCameraPreviewParamsReady) {