Clean up GvrPlayerActivity

PiperOrigin-RevId: 274845045

extensions/gvr/src/main/java/com/google/android/exoplayer2/ext/gvr/GvrPlayerActivity.java

@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * See the License for the specific language governing permissions and
  * limitations under the License.
  * limitations under the License.
  */
  */
-
 package com.google.android.exoplayer2.ext.gvr;
 package com.google.android.exoplayer2.ext.gvr;
 
 
 import android.content.Context;
 import android.content.Context;
@@ -21,8 +20,6 @@ import android.content.Intent;
 import android.graphics.SurfaceTexture;
 import android.graphics.SurfaceTexture;
 import android.opengl.Matrix;
 import android.opengl.Matrix;
 import android.os.Bundle;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Looper;
 import android.view.ContextThemeWrapper;
 import android.view.ContextThemeWrapper;
 import android.view.MotionEvent;
 import android.view.MotionEvent;
 import android.view.Surface;
 import android.view.Surface;
@@ -47,6 +44,7 @@ import com.google.vr.sdk.base.HeadTransform;
 import com.google.vr.sdk.base.Viewport;
 import com.google.vr.sdk.base.Viewport;
 import com.google.vr.sdk.controller.Controller;
 import com.google.vr.sdk.controller.Controller;
 import com.google.vr.sdk.controller.ControllerManager;
 import com.google.vr.sdk.controller.ControllerManager;
+import com.google.vr.sdk.controller.Orientation;
 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.egl.EGLConfig;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 
@@ -58,46 +56,36 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
 
   private static final int EXIT_FROM_VR_REQUEST_CODE = 42;
   private static final int EXIT_FROM_VR_REQUEST_CODE = 42;
 
 
-  private final Handler mainHandler;
-
   @Nullable private Player player;
   @Nullable private Player player;
-  private @MonotonicNonNull GlViewGroup glView;
   private @MonotonicNonNull ControllerManager controllerManager;
   private @MonotonicNonNull ControllerManager controllerManager;
   private @MonotonicNonNull SurfaceTexture surfaceTexture;
   private @MonotonicNonNull SurfaceTexture surfaceTexture;
   private @MonotonicNonNull Surface surface;
   private @MonotonicNonNull Surface surface;
-  private @MonotonicNonNull SceneRenderer scene;
-  private @MonotonicNonNull PlayerControlView playerControl;
-
-  public GvrPlayerActivity() {
-    mainHandler = new Handler(Looper.getMainLooper());
-  }
+  private @MonotonicNonNull SceneRenderer sceneRenderer;
+  private @MonotonicNonNull PlayerControlView playerControlView;
 
 
   @Override
   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
   protected void onCreate(@Nullable Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     super.onCreate(savedInstanceState);
     setScreenAlwaysOn(true);
     setScreenAlwaysOn(true);
 
 
-    GvrView gvrView = new GvrView(this);
-    // Since videos typically have fewer pixels per degree than the phones, reducing the render
-    // target scaling factor reduces the work required to render the scene.
-    gvrView.setRenderTargetScale(.5f);
+    GvrView gvrView = new GvrView(/* context= */ this);
+    gvrView.setRenderTargetScale(getRenderTargetScale());
 
 
     // If a custom theme isn't specified, the Context's theme is used. For VR Activities, this is
     // If a custom theme isn't specified, the Context's theme is used. For VR Activities, this is
     // the old Android default theme rather than a modern theme. Override this with a custom theme.
     // the old Android default theme rather than a modern theme. Override this with a custom theme.
-    Context theme = new ContextThemeWrapper(this, R.style.VrTheme);
-    glView = new GlViewGroup(theme, R.layout.vr_ui);
+    Context theme = new ContextThemeWrapper(this, R.style.ExoVrTheme);
+    GlViewGroup glViewGroup = new GlViewGroup(theme, R.layout.exo_vr_ui);
 
 
-    playerControl = Assertions.checkNotNull(glView.findViewById(R.id.controller));
-    playerControl.setShowVrButton(true);
-    playerControl.setVrButtonListener(v -> exit());
+    playerControlView = Assertions.checkNotNull(glViewGroup.findViewById(R.id.controller));
+    playerControlView.setShowVrButton(true);
+    playerControlView.setVrButtonListener(v -> exit());
 
 
+    sceneRenderer = new SceneRenderer();
     PointerRenderer pointerRenderer = new PointerRenderer();
     PointerRenderer pointerRenderer = new PointerRenderer();
-    scene = new SceneRenderer();
-    Renderer renderer = new Renderer(scene, glView, pointerRenderer);
-
-    // Attach glView to gvrView in order to properly handle UI events.
-    gvrView.addView(glView, 0);
+    Renderer renderer = new Renderer(sceneRenderer, pointerRenderer, glViewGroup);
 
 
+    // Attach glViewGroup to gvrView in order to properly handle UI events.
+    gvrView.addView(glViewGroup);
     // Standard GvrView configuration
     // Standard GvrView configuration
     gvrView.setEGLConfigChooser(
     gvrView.setEGLConfigChooser(
         8, 8, 8, 8, // RGBA bits.
         8, 8, 8, 8, // RGBA bits.
@@ -106,15 +94,13 @@ public abstract class GvrPlayerActivity extends GvrActivity {
     gvrView.setRenderer(renderer);
     gvrView.setRenderer(renderer);
     setContentView(gvrView);
     setContentView(gvrView);
 
 
-    // Most Daydream phones can render a 4k video at 60fps in sustained performance mode. These
-    // options can be tweaked along with the render target scale.
     if (gvrView.setAsyncReprojectionEnabled(true)) {
     if (gvrView.setAsyncReprojectionEnabled(true)) {
-      AndroidCompat.setSustainedPerformanceMode(this, true);
+      AndroidCompat.setSustainedPerformanceMode(/* activity= */ this, true);
     }
     }
 
 
     // Handle the user clicking on the 'X' in the top left corner. Since this is done when the user
     // Handle the user clicking on the 'X' in the top left corner. Since this is done when the user
     // has taken the headset out of VR, it should launch the app's exit flow directly rather than
     // has taken the headset out of VR, it should launch the app's exit flow directly rather than
-    // using the transition flow.
+    // using Daydream's exit transition.
     gvrView.setOnCloseButtonListener(this::finish);
     gvrView.setOnCloseButtonListener(this::finish);
 
 
     ControllerManager.EventListener listener =
     ControllerManager.EventListener listener =
@@ -126,15 +112,14 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
 
           @Override
           @Override
           public void onRecentered() {
           public void onRecentered() {
-            // TODO if in cardboard mode call gvrView.recenterHeadTracker();
-            glView.post(() -> Util.castNonNull(playerControl).show());
+            // TODO: If in cardboard mode call gvrView.recenterHeadTracker().
+            runOnUiThread(() -> Util.castNonNull(playerControlView).show());
           }
           }
         };
         };
     controllerManager = new ControllerManager(this, listener);
     controllerManager = new ControllerManager(this, listener);
-
     Controller controller = controllerManager.getController();
     Controller controller = controllerManager.getController();
     ControllerEventListener controllerEventListener =
     ControllerEventListener controllerEventListener =
-        new ControllerEventListener(controller, pointerRenderer, glView);
+        new ControllerEventListener(controller, pointerRenderer, glViewGroup);
     controller.setEventListener(controllerEventListener);
     controller.setEventListener(controllerEventListener);
   }
   }
 
 
@@ -144,7 +129,7 @@ public abstract class GvrPlayerActivity extends GvrActivity {
    * @param newPlayer The {@link Player} to use, or {@code null} to detach the current player.
    * @param newPlayer The {@link Player} to use, or {@code null} to detach the current player.
    */
    */
   protected void setPlayer(@Nullable Player newPlayer) {
   protected void setPlayer(@Nullable Player newPlayer) {
-    Assertions.checkNotNull(scene);
+    Assertions.checkNotNull(sceneRenderer);
     if (player == newPlayer) {
     if (player == newPlayer) {
       return;
       return;
     }
     }
@@ -154,20 +139,20 @@ public abstract class GvrPlayerActivity extends GvrActivity {
         if (surface != null) {
         if (surface != null) {
           videoComponent.clearVideoSurface(surface);
           videoComponent.clearVideoSurface(surface);
         }
         }
-        videoComponent.clearVideoFrameMetadataListener(scene);
-        videoComponent.clearCameraMotionListener(scene);
+        videoComponent.clearVideoFrameMetadataListener(sceneRenderer);
+        videoComponent.clearCameraMotionListener(sceneRenderer);
       }
       }
     }
     }
     player = newPlayer;
     player = newPlayer;
     if (player != null) {
     if (player != null) {
       Player.VideoComponent videoComponent = player.getVideoComponent();
       Player.VideoComponent videoComponent = player.getVideoComponent();
       if (videoComponent != null) {
       if (videoComponent != null) {
-        videoComponent.setVideoFrameMetadataListener(scene);
-        videoComponent.setCameraMotionListener(scene);
+        videoComponent.setVideoFrameMetadataListener(sceneRenderer);
+        videoComponent.setCameraMotionListener(sceneRenderer);
         videoComponent.setVideoSurface(surface);
         videoComponent.setVideoSurface(surface);
       }
       }
     }
     }
-    Assertions.checkNotNull(playerControl).setPlayer(player);
+    Assertions.checkNotNull(playerControlView).setPlayer(player);
   }
   }
 
 
   /**
   /**
@@ -177,7 +162,19 @@ public abstract class GvrPlayerActivity extends GvrActivity {
    * @param stereoMode A {@link C.StereoMode} value.
    * @param stereoMode A {@link C.StereoMode} value.
    */
    */
   protected void setDefaultStereoMode(@C.StereoMode int stereoMode) {
   protected void setDefaultStereoMode(@C.StereoMode int stereoMode) {
-    Assertions.checkNotNull(scene).setDefaultStereoMode(stereoMode);
+    Assertions.checkNotNull(sceneRenderer).setDefaultStereoMode(stereoMode);
+  }
+
+  /**
+   * Returns the render target scale passed to {@link GvrView#setRenderTargetScale(float)}. Since
+   * videos typically have fewer pixels per degree than the phone displays, the target can normally
+   * be lower than 1 to reduce the amount of work required to render the scene. The default value is
+   * 0.5.
+   *
+   * @return The render target scale passed to {@link GvrView#setRenderTargetScale(float)}.
+   */
+  protected float getRenderTargetScale() {
+    return 0.5f;
   }
   }
 
 
   @CallSuper
   @CallSuper
@@ -210,12 +207,12 @@ public abstract class GvrPlayerActivity extends GvrActivity {
   /** Tries to exit gracefully from VR using a VR transition dialog. */
   /** Tries to exit gracefully from VR using a VR transition dialog. */
   @SuppressWarnings("nullness:argument.type.incompatible")
   @SuppressWarnings("nullness:argument.type.incompatible")
   protected void exit() {
   protected void exit() {
-    // This needs to use GVR's exit transition to avoid disorienting the user.
-    DaydreamApi api = DaydreamApi.create(this);
-    if (api != null) {
-      api.exitFromVr(this, EXIT_FROM_VR_REQUEST_CODE, null);
-      // Eventually, the Activity's onActivityResult will be called.
-      api.close();
+    DaydreamApi daydreamApi = DaydreamApi.create(this);
+    if (daydreamApi != null) {
+      // Use Daydream's exit transition to avoid disorienting the user. This will cause
+      // onActivityResult to be called.
+      daydreamApi.exitFromVr(/* activity= */ this, EXIT_FROM_VR_REQUEST_CODE, /* intent= */ null);
+      daydreamApi.close();
     } else {
     } else {
       finish();
       finish();
     }
     }
@@ -224,16 +221,16 @@ public abstract class GvrPlayerActivity extends GvrActivity {
   /** Toggles PlayerControl visibility. */
   /** Toggles PlayerControl visibility. */
   @UiThread
   @UiThread
   protected void togglePlayerControlVisibility() {
   protected void togglePlayerControlVisibility() {
-    if (Assertions.checkNotNull(playerControl).isVisible()) {
-      playerControl.hide();
+    if (Assertions.checkNotNull(playerControlView).isVisible()) {
+      playerControlView.hide();
     } else {
     } else {
-      playerControl.show();
+      playerControlView.show();
     }
     }
   }
   }
 
 
-  // Called on GL thread.
   private void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture) {
   private void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture) {
-    mainHandler.post(
+    // Called on the GL thread. Post to the main thread.
+    runOnUiThread(
         () -> {
         () -> {
           SurfaceTexture oldSurfaceTexture = this.surfaceTexture;
           SurfaceTexture oldSurfaceTexture = this.surfaceTexture;
           Surface oldSurface = this.surface;
           Surface oldSurface = this.surface;
@@ -260,18 +257,20 @@ public abstract class GvrPlayerActivity extends GvrActivity {
   }
   }
 
 
   private class Renderer implements GvrView.StereoRenderer {
   private class Renderer implements GvrView.StereoRenderer {
-    private static final float Z_NEAR = .1f;
+    private static final float Z_NEAR = 0.1f;
     private static final float Z_FAR = 100;
     private static final float Z_FAR = 100;
 
 
-    private final float[] viewProjectionMatrix = new float[16];
-    private final SceneRenderer scene;
-    private final GlViewGroup glView;
+    private final SceneRenderer sceneRenderer;
     private final PointerRenderer pointerRenderer;
     private final PointerRenderer pointerRenderer;
+    private final GlViewGroup glViewGroup;
+    private final float[] viewProjectionMatrix;
 
 
-    public Renderer(SceneRenderer scene, GlViewGroup glView, PointerRenderer pointerRenderer) {
-      this.scene = scene;
-      this.glView = glView;
+    public Renderer(
+        SceneRenderer sceneRenderer, PointerRenderer pointerRenderer, GlViewGroup glViewGroup) {
+      this.sceneRenderer = sceneRenderer;
       this.pointerRenderer = pointerRenderer;
       this.pointerRenderer = pointerRenderer;
+      this.glViewGroup = glViewGroup;
+      viewProjectionMatrix = new float[16];
     }
     }
 
 
     @Override
     @Override
@@ -281,9 +280,9 @@ public abstract class GvrPlayerActivity extends GvrActivity {
     public void onDrawEye(Eye eye) {
     public void onDrawEye(Eye eye) {
       Matrix.multiplyMM(
       Matrix.multiplyMM(
           viewProjectionMatrix, 0, eye.getPerspective(Z_NEAR, Z_FAR), 0, eye.getEyeView(), 0);
           viewProjectionMatrix, 0, eye.getPerspective(Z_NEAR, Z_FAR), 0, eye.getEyeView(), 0);
-      scene.drawFrame(viewProjectionMatrix, eye.getType() == Eye.Type.RIGHT);
-      if (glView.isVisible()) {
-        glView.getRenderer().draw(viewProjectionMatrix);
+      sceneRenderer.drawFrame(viewProjectionMatrix, eye.getType() == Eye.Type.RIGHT);
+      if (glViewGroup.isVisible()) {
+        glViewGroup.getRenderer().draw(viewProjectionMatrix);
         pointerRenderer.draw(viewProjectionMatrix);
         pointerRenderer.draw(viewProjectionMatrix);
       }
       }
     }
     }
@@ -293,8 +292,8 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
 
     @Override
     @Override
     public void onSurfaceCreated(EGLConfig config) {
     public void onSurfaceCreated(EGLConfig config) {
-      onSurfaceTextureAvailable(scene.init());
-      glView.getRenderer().init();
+      onSurfaceTextureAvailable(sceneRenderer.init());
+      glViewGroup.getRenderer().init();
       pointerRenderer.init();
       pointerRenderer.init();
     }
     }
 
 
@@ -303,9 +302,9 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
 
     @Override
     @Override
     public void onRendererShutdown() {
     public void onRendererShutdown() {
-      glView.getRenderer().shutdown();
+      glViewGroup.getRenderer().shutdown();
       pointerRenderer.shutdown();
       pointerRenderer.shutdown();
-      scene.shutdown();
+      sceneRenderer.shutdown();
     }
     }
   }
   }
 
 
@@ -313,16 +312,16 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
 
     private final Controller controller;
     private final Controller controller;
     private final PointerRenderer pointerRenderer;
     private final PointerRenderer pointerRenderer;
-    private final GlViewGroup glView;
+    private final GlViewGroup glViewGroup;
     private final float[] controllerOrientationMatrix;
     private final float[] controllerOrientationMatrix;
     private boolean clickButtonDown;
     private boolean clickButtonDown;
     private boolean appButtonDown;
     private boolean appButtonDown;
 
 
     public ControllerEventListener(
     public ControllerEventListener(
-        Controller controller, PointerRenderer pointerRenderer, GlViewGroup glView) {
+        Controller controller, PointerRenderer pointerRenderer, GlViewGroup glViewGroup) {
       this.controller = controller;
       this.controller = controller;
       this.pointerRenderer = pointerRenderer;
       this.pointerRenderer = pointerRenderer;
-      this.glView = glView;
+      this.glViewGroup = glViewGroup;
       controllerOrientationMatrix = new float[16];
       controllerOrientationMatrix = new float[16];
     }
     }
 
 
@@ -330,7 +329,8 @@ public abstract class GvrPlayerActivity extends GvrActivity {
     @BinderThread
     @BinderThread
     public void onUpdate() {
     public void onUpdate() {
       controller.update();
       controller.update();
-      controller.orientation.toRotationMatrix(controllerOrientationMatrix);
+      Orientation orientation = controller.orientation;
+      orientation.toRotationMatrix(controllerOrientationMatrix);
       pointerRenderer.setControllerOrientation(controllerOrientationMatrix);
       pointerRenderer.setControllerOrientation(controllerOrientationMatrix);
 
 
       if (clickButtonDown || controller.clickButtonState) {
       if (clickButtonDown || controller.clickButtonState) {
@@ -341,18 +341,19 @@ public abstract class GvrPlayerActivity extends GvrActivity {
         } else {
         } else {
           action = MotionEvent.ACTION_MOVE;
           action = MotionEvent.ACTION_MOVE;
         }
         }
-        glView.post(
-            () -> {
-              float[] angles = controller.orientation.toYawPitchRollRadians(new float[3]);
-              boolean clickedOnView = glView.simulateClick(action, angles[0], angles[1]);
-              if (action == MotionEvent.ACTION_DOWN && !clickedOnView) {
-                togglePlayerControlVisibility();
-              }
-            });
+        float[] yawPitchRoll = orientation.toYawPitchRollRadians(new float[3]);
+        runOnUiThread(() -> dispatchClick(action, yawPitchRoll[0], yawPitchRoll[1]));
       } else if (!appButtonDown && controller.appButtonState) {
       } else if (!appButtonDown && controller.appButtonState) {
-        glView.post(GvrPlayerActivity.this::togglePlayerControlVisibility);
+        runOnUiThread(GvrPlayerActivity.this::togglePlayerControlVisibility);
       }
       }
       appButtonDown = controller.appButtonState;
       appButtonDown = controller.appButtonState;
     }
     }
+
+    private void dispatchClick(int action, float yaw, float pitch) {
+      boolean clickedOnView = glViewGroup.simulateClick(action, yaw, pitch);
+      if (action == MotionEvent.ACTION_DOWN && !clickedOnView) {
+        togglePlayerControlVisibility();
+      }
+    }
   }
   }
 }
 }

extensions/gvr/src/main/res/layout/vr_ui.xml → extensions/gvr/src/main/res/layout/exo_vr_ui.xml

@@ -13,16 +13,8 @@
      See the License for the specific language governing permissions and
      See the License for the specific language governing permissions and
      limitations under the License.
      limitations under the License.
 -->
 -->
-<merge xmlns:android="http://schemas.android.com/apk/res/android"
-  xmlns:tools="http://schemas.android.com/tools"
-  android:id="@+id/video_ui_view"
-  android:layout_width="match_parent"
-  android:layout_height="wrap_content"
-  android:background="@android:color/black"
-  android:orientation="horizontal"
-  tools:ignore="Overdraw">
-  <com.google.android.exoplayer2.ui.PlayerControlView
+<com.google.android.exoplayer2.ui.PlayerControlView
+    xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/controller"
     android:id="@+id/controller"
     android:layout_width="match_parent"
     android:layout_width="match_parent"
     android:layout_height="match_parent"/>
     android:layout_height="match_parent"/>
-</merge>

extensions/gvr/src/main/res/values-v21/styles.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2018 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<resources>
-  <style name="VrTheme" parent="android:Theme.Material"/>
-</resources>

extensions/gvr/src/main/res/values/styles.xml

@@ -14,5 +14,5 @@
      limitations under the License.
      limitations under the License.
 -->
 -->
 <resources>
 <resources>
-  <style name="VrTheme" parent="android:Theme.Holo"/>
+  <style name="ExoVrTheme" parent="android:Theme.DeviceDefault"/>
 </resources>
 </resources>

library/ui/src/main/java/com/google/android/exoplayer2/ui/spherical/CanvasRenderer.java

@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * See the License for the specific language governing permissions and
  * limitations under the License.
  * limitations under the License.
  */
  */
-
 package com.google.android.exoplayer2.ui.spherical;
 package com.google.android.exoplayer2.ui.spherical;
 
 
 import static com.google.android.exoplayer2.util.GlUtil.checkGlError;
 import static com.google.android.exoplayer2.util.GlUtil.checkGlError;

library/ui/src/main/java/com/google/android/exoplayer2/ui/spherical/GlViewGroup.java

@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * See the License for the specific language governing permissions and
  * limitations under the License.
  * limitations under the License.
  */
  */
-
 package com.google.android.exoplayer2.ui.spherical;
 package com.google.android.exoplayer2.ui.spherical;
 
 
 import android.content.Context;
 import android.content.Context;

library/ui/src/main/java/com/google/android/exoplayer2/ui/spherical/PointerRenderer.java

@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * See the License for the specific language governing permissions and
  * limitations under the License.
  * limitations under the License.
  */
  */
-
 package com.google.android.exoplayer2.ui.spherical;
 package com.google.android.exoplayer2.ui.spherical;
 
 
 import static com.google.android.exoplayer2.util.GlUtil.checkGlError;
 import static com.google.android.exoplayer2.util.GlUtil.checkGlError;
@@ -26,7 +25,7 @@ import java.nio.FloatBuffer;
 /** Renders a pointer. */
 /** Renders a pointer. */
 public final class PointerRenderer {
 public final class PointerRenderer {
   // The pointer quad is 2 * SIZE units.
   // The pointer quad is 2 * SIZE units.
-  private static final float SIZE = .01f;
+  private static final float SIZE = 0.01f;
   private static final float DISTANCE = 1;
   private static final float DISTANCE = 1;
 
 
   // Standard vertex shader.
   // Standard vertex shader.

library/ui/src/main/java/com/google/android/exoplayer2/ui/spherical/SphericalSurfaceView.java

@@ -55,7 +55,7 @@ public final class SphericalSurfaceView extends GLSurfaceView {
 
 
   // Arbitrary vertical field of view.
   // Arbitrary vertical field of view.
   private static final int FIELD_OF_VIEW_DEGREES = 90;
   private static final int FIELD_OF_VIEW_DEGREES = 90;
-  private static final float Z_NEAR = .1f;
+  private static final float Z_NEAR = 0.1f;
   private static final float Z_FAR = 100;
   private static final float Z_FAR = 100;
 
 
   // TODO Calculate this depending on surface size and field of view.
   // TODO Calculate this depending on surface size and field of view.
@@ -84,7 +84,7 @@ public final class SphericalSurfaceView extends GLSurfaceView {
     // Configure sensors and touch.
     // Configure sensors and touch.
     sensorManager =
     sensorManager =
         (SensorManager) Assertions.checkNotNull(context.getSystemService(Context.SENSOR_SERVICE));
         (SensorManager) Assertions.checkNotNull(context.getSystemService(Context.SENSOR_SERVICE));
-    Sensor orientationSensor = null;
+    @Nullable Sensor orientationSensor = null;
     if (Util.SDK_INT >= 18) {
     if (Util.SDK_INT >= 18) {
       // TYPE_GAME_ROTATION_VECTOR is the easiest sensor since it handles all the complex math for
       // TYPE_GAME_ROTATION_VECTOR is the easiest sensor since it handles all the complex math for
       // fusion. It's used instead of TYPE_ROTATION_VECTOR since the latter uses the magnetometer on
       // fusion. It's used instead of TYPE_ROTATION_VECTOR since the latter uses the magnetometer on