rewrite HC Gallery app to support phones. In summary, this change:

- moves tablet-style layouts to layout-large* directories
- adds ContentActivity to host the ContentFragment when on phones
- adds an OnItemSelectedListener interface to TitlesFragment, which MainActivity
  implements in order to receive callbacks on click events to the list item and then
  pass the selected item to the ContentFragment in the manner appropriate for the
  current configuration... Specifically, when in two-pane mode, it updates the ContentFragment
  directly, and when in single-pane mode, it starts the ContentActivity with intent data
  about the selected item, which then updates the ContentFragment
- Change CameraSample.java to CameraActivity.java for name conventions
- Moves all menu strings into string resources
- Fixes camera sample to properly handle front-facing camera on other devices (was broken
  on nexus s and on g-slate)
- Fixes camera sample to handle resume state after the camera has changed (for example, when
  switched to a different camera, it would crash on resume)
- Moves various code around between classes as appropriate for the fragment handling the
  action. For example, move the ActionBar.TabListener implementation to the TitlesFragment
  (was originally impemented by the MainActivity)
- Adds logic to support devices without camera and properly declare the camera in manifest as such
- Maintains the state of hidden titles list across restarts

Change-Id: I27a39a68dee37325c0c3607aa0b56ab6c134d026

samples/HoneycombGallery/src/com/example/android/hcgallery/CameraFragment.java

@@ -16,12 +16,9 @@
 
 package com.example.android.hcgallery;
 
-import java.io.IOException;
-import java.util.List;
-
-import android.app.Fragment;
-import android.app.Activity;
 import android.app.ActionBar;
+import android.app.Activity;
+import android.app.Fragment;
 import android.content.Context;
 import android.content.Intent;
 import android.hardware.Camera;
@@ -38,12 +35,16 @@ import android.view.SurfaceView;
 import android.view.View;
 import android.view.ViewGroup;
 
+import java.io.IOException;
+import java.util.List;
+
 public class CameraFragment extends Fragment {
 
     private Preview mPreview;
     Camera mCamera;
     int mNumberOfCameras;
-    int mCameraCurrentlyLocked;
+    int mCurrentCamera;  // Camera ID currently chosen
+    int mCameraCurrentlyLocked;  // Camera ID that's actually acquired
 
     // The first rear facing camera
     int mDefaultCameraId;
@@ -52,20 +53,18 @@ public class CameraFragment extends Fragment {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-
-        // Create a RelativeLayout container that will hold a SurfaceView,
-        // and set it as the content of our activity.
+        // Create a container that will hold a SurfaceView for camera previews
         mPreview = new Preview(this.getActivity());
 
         // Find the total number of cameras available
         mNumberOfCameras = Camera.getNumberOfCameras();
 
-        // Find the ID of the default camera
+        // Find the ID of the rear-facing ("default") camera
         CameraInfo cameraInfo = new CameraInfo();
         for (int i = 0; i < mNumberOfCameras; i++) {
             Camera.getCameraInfo(i, cameraInfo);
             if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
-                mDefaultCameraId = i;
+                mCurrentCamera = mDefaultCameraId = i;
             }
         }
         setHasOptionsMenu(mNumberOfCameras > 1);
@@ -95,9 +94,10 @@ public class CameraFragment extends Fragment {
     public void onResume() {
         super.onResume();
 
-        // Open the default i.e. the first rear facing camera.
-        mCamera = Camera.open(mDefaultCameraId);
-        mCameraCurrentlyLocked = mDefaultCameraId;
+        // Use mCurrentCamera to select the camera desired to safely restore
+        // the fragment after the camera has been changed
+        mCamera = Camera.open(mCurrentCamera);
+        mCameraCurrentlyLocked = mCurrentCamera;
         mPreview.setCamera(mCamera);
     }
 
@@ -128,7 +128,7 @@ public class CameraFragment extends Fragment {
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle item selection
         switch (item.getItemId()) {
-        case R.id.switch_cam:
+        case R.id.menu_switch_cam:
             // Release this camera -> mCameraCurrentlyLocked
             if (mCamera != null) {
                 mCamera.stopPreview();
@@ -139,10 +139,9 @@ public class CameraFragment extends Fragment {
 
             // Acquire the next camera and request Preview to reconfigure
             // parameters.
-            mCamera = Camera
-                    .open((mCameraCurrentlyLocked + 1) % mNumberOfCameras);
-            mCameraCurrentlyLocked = (mCameraCurrentlyLocked + 1)
-                    % mNumberOfCameras;
+            mCurrentCamera = (mCameraCurrentlyLocked + 1) % mNumberOfCameras;
+            mCamera = Camera.open(mCurrentCamera);
+            mCameraCurrentlyLocked = mCurrentCamera;
             mPreview.switchCamera(mCamera);
 
             // Start the preview
@@ -152,6 +151,7 @@ public class CameraFragment extends Fragment {
             Intent intent = new Intent(this.getActivity(), MainActivity.class);
             intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);
             startActivity(intent);
+            return true;
 
         default:
             return super.onOptionsItemSelected(item);
@@ -175,6 +175,7 @@ class Preview extends ViewGroup implements SurfaceHolder.Callback {
     Size mPreviewSize;
     List<Size> mSupportedPreviewSizes;
     Camera mCamera;
+    boolean mSurfaceCreated = false;
 
     Preview(Context context) {
         super(context);
@@ -194,7 +195,7 @@ class Preview extends ViewGroup implements SurfaceHolder.Callback {
         if (mCamera != null) {
             mSupportedPreviewSizes = mCamera.getParameters()
                     .getSupportedPreviewSizes();
-            requestLayout();
+            if (mSurfaceCreated) requestLayout();
         }
     }
 
@@ -205,11 +206,6 @@ class Preview extends ViewGroup implements SurfaceHolder.Callback {
         } catch (IOException exception) {
             Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
         }
-        Camera.Parameters parameters = camera.getParameters();
-        parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
-        requestLayout();
-
-        camera.setParameters(parameters);
     }
 
     @Override
@@ -227,11 +223,18 @@ class Preview extends ViewGroup implements SurfaceHolder.Callback {
             mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width,
                     height);
         }
+
+        if (mCamera != null) {
+          Camera.Parameters parameters = mCamera.getParameters();
+          parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
+
+          mCamera.setParameters(parameters);
+        }
     }
 
     @Override
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
-        if (changed && getChildCount() > 0) {
+        if (getChildCount() > 0) {
             final View child = getChildAt(0);
 
             final int width = r - l;
@@ -269,6 +272,8 @@ class Preview extends ViewGroup implements SurfaceHolder.Callback {
         } catch (IOException exception) {
             Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
         }
+        if (mPreviewSize == null) requestLayout();
+        mSurfaceCreated = true;
     }
 
     public void surfaceDestroyed(SurfaceHolder holder) {