Remove nullness blacklist for UI module

PiperOrigin-RevId: 283324784

library/core/src/main/java/com/google/android/exoplayer2/util/Assertions.java

@@ -97,6 +97,42 @@ public final class Assertions {
   }
 
   /**
+   * Throws {@link IllegalStateException} if {@code reference} is null.
+   *
+   * @param <T> The type of the reference.
+   * @param reference The reference.
+   * @return The non-null reference that was validated.
+   * @throws IllegalStateException If {@code reference} is null.
+   */
+  @SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
+  @EnsuresNonNull({"#1"})
+  public static <T> T checkStateNotNull(@Nullable T reference) {
+    if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && reference == null) {
+      throw new IllegalStateException();
+    }
+    return reference;
+  }
+
+  /**
+   * Throws {@link IllegalStateException} if {@code reference} is null.
+   *
+   * @param <T> The type of the reference.
+   * @param reference The reference.
+   * @param errorMessage The exception message to use if the check fails. The message is converted
+   *     to a string using {@link String#valueOf(Object)}.
+   * @return The non-null reference that was validated.
+   * @throws IllegalStateException If {@code reference} is null.
+   */
+  @SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
+  @EnsuresNonNull({"#1"})
+  public static <T> T checkStateNotNull(@Nullable T reference, Object errorMessage) {
+    if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && reference == null) {
+      throw new IllegalStateException(String.valueOf(errorMessage));
+    }
+    return reference;
+  }
+
+  /**
    * Throws {@link NullPointerException} if {@code reference} is null.
    *
    * @param <T> The type of the reference.

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerControlView.java

@@ -233,18 +233,18 @@ public class PlayerControlView extends FrameLayout {
 
   private final ComponentListener componentListener;
   private final CopyOnWriteArrayList<VisibilityListener> visibilityListeners;
-  private final View previousButton;
-  private final View nextButton;
-  private final View playButton;
-  private final View pauseButton;
-  private final View fastForwardButton;
-  private final View rewindButton;
-  private final ImageView repeatToggleButton;
-  private final ImageView shuffleButton;
-  private final View vrButton;
-  private final TextView durationView;
-  private final TextView positionView;
-  private final TimeBar timeBar;
+  @Nullable private final View previousButton;
+  @Nullable private final View nextButton;
+  @Nullable private final View playButton;
+  @Nullable private final View pauseButton;
+  @Nullable private final View fastForwardButton;
+  @Nullable private final View rewindButton;
+  @Nullable private final ImageView repeatToggleButton;
+  @Nullable private final ImageView shuffleButton;
+  @Nullable private final View vrButton;
+  @Nullable private final TextView durationView;
+  @Nullable private final TextView positionView;
+  @Nullable private final TimeBar timeBar;
   private final StringBuilder formatBuilder;
   private final Formatter formatter;
   private final Timeline.Period period;
@@ -299,6 +299,11 @@ public class PlayerControlView extends FrameLayout {
     this(context, attrs, defStyleAttr, attrs);
   }
 
+  @SuppressWarnings({
+    "nullness:argument.type.incompatible",
+    "nullness:method.invocation.invalid",
+    "nullness:methodref.receiver.bound.invalid"
+  })
   public PlayerControlView(
       Context context,
       @Nullable AttributeSet attrs,
@@ -350,7 +355,7 @@ public class PlayerControlView extends FrameLayout {
     updateProgressAction = this::updateProgress;
     hideAction = this::hide;
 
-    LayoutInflater.from(context).inflate(controllerLayoutId, this);
+    LayoutInflater.from(context).inflate(controllerLayoutId, /* root= */ this);
     setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
 
     TimeBar customTimeBar = findViewById(R.id.exo_progress);
@@ -778,6 +783,8 @@ public class PlayerControlView extends FrameLayout {
     if (!isVisible() || !isAttachedToWindow) {
       return;
     }
+
+    @Nullable Player player = this.player;
     boolean enableSeeking = false;
     boolean enablePrevious = false;
     boolean enableRewind = false;
@@ -809,16 +816,20 @@ public class PlayerControlView extends FrameLayout {
     if (!isVisible() || !isAttachedToWindow || repeatToggleButton == null) {
       return;
     }
+
     if (repeatToggleModes == RepeatModeUtil.REPEAT_TOGGLE_MODE_NONE) {
       repeatToggleButton.setVisibility(GONE);
       return;
     }
+
+    @Nullable Player player = this.player;
     if (player == null) {
       setButtonEnabled(false, repeatToggleButton);
       repeatToggleButton.setImageDrawable(repeatOffButtonDrawable);
       repeatToggleButton.setContentDescription(repeatOffButtonContentDescription);
       return;
     }
+
     setButtonEnabled(true, repeatToggleButton);
     switch (player.getRepeatMode()) {
       case Player.REPEAT_MODE_OFF:
@@ -843,6 +854,8 @@ public class PlayerControlView extends FrameLayout {
     if (!isVisible() || !isAttachedToWindow || shuffleButton == null) {
       return;
     }
+
+    @Nullable Player player = this.player;
     if (!showShuffleButton) {
       shuffleButton.setVisibility(GONE);
     } else if (player == null) {
@@ -861,6 +874,7 @@ public class PlayerControlView extends FrameLayout {
   }
 
   private void updateTimeline() {
+    @Nullable Player player = this.player;
     if (player == null) {
       return;
     }
@@ -935,6 +949,7 @@ public class PlayerControlView extends FrameLayout {
       return;
     }
 
+    @Nullable Player player = this.player;
     long position = 0;
     long bufferedPosition = 0;
     if (player != null) {
@@ -985,7 +1000,7 @@ public class PlayerControlView extends FrameLayout {
     }
   }
 
-  private void setButtonEnabled(boolean enabled, View view) {
+  private void setButtonEnabled(boolean enabled, @Nullable View view) {
     if (view == null) {
       return;
     }
@@ -1129,6 +1144,7 @@ public class PlayerControlView extends FrameLayout {
    */
   public boolean dispatchMediaKeyEvent(KeyEvent event) {
     int keyCode = event.getKeyCode();
+    @Nullable Player player = this.player;
     if (player == null || !isHandledMediaKey(keyCode)) {
       return false;
     }