[Predictive Back] Fixed IllegalStateException crashes caused by MaterialBackAnimationHelper.

PiperOrigin-RevId: 555180647

Author: afohrman

lib/java/com/google/android/material/motion/MaterialBackAnimationHelper.java

@@ -19,14 +19,14 @@
 
 import android.animation.TimeInterpolator;
 import android.content.Context;
+import android.util.Log;
 import android.view.View;
 import androidx.activity.BackEventCompat;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RestrictTo;
 import androidx.annotation.RestrictTo.Scope;
 import androidx.core.view.animation.PathInterpolatorCompat;
-import com.google.errorprone.annotations.CanIgnoreReturnValue;
 
 /**
  * Base helper class for views that support back handling, which assists with common animation
@@ -37,6 +37,7 @@
 @RestrictTo(Scope.LIBRARY_GROUP)
 public abstract class MaterialBackAnimationHelper<V extends View> {
 
+  private static final String TAG = "MaterialBackHelper";
   private static final int HIDE_DURATION_MAX_DEFAULT = 300;
   private static final int HIDE_DURATION_MIN_DEFAULT = 150;
   private static final int CANCEL_DURATION_DEFAULT = 100;
@@ -78,11 +79,14 @@ protected void onStartBackProgress(@NonNull BackEventCompat backEvent) {
     this.backEvent = backEvent;
   }
 
-  protected void onUpdateBackProgress(@NonNull BackEventCompat backEvent) {
+  @Nullable
+  protected BackEventCompat onUpdateBackProgress(@NonNull BackEventCompat backEvent) {
     if (this.backEvent == null) {
-      throw new IllegalStateException("Must call startBackProgress() before updateBackProgress()");
+      Log.w(TAG, "Must call startBackProgress() before updateBackProgress()");
     }
+    BackEventCompat finalBackEvent = this.backEvent;
     this.backEvent = backEvent;
+    return finalBackEvent;
   }
 
   @Nullable
@@ -92,11 +96,11 @@ public BackEventCompat onHandleBackInvoked() {
     return finalBackEvent;
   }
 
-  @CanIgnoreReturnValue
-  @NonNull
+  @Nullable
   protected BackEventCompat onCancelBackProgress() {
     if (this.backEvent == null) {
-      throw new IllegalStateException(
+      Log.w(
+          TAG,
           "Must call startBackProgress() and updateBackProgress() before cancelBackProgress()");
     }
     BackEventCompat finalBackEvent = this.backEvent;

lib/java/com/google/android/material/motion/MaterialBottomContainerBackHelper.java

@@ -62,7 +62,9 @@ public void startBackProgress(@NonNull BackEventCompat backEvent) {
   }
 
   public void updateBackProgress(@NonNull BackEventCompat backEvent) {
-    super.onUpdateBackProgress(backEvent);
+    if (super.onUpdateBackProgress(backEvent) == null) {
+      return;
+    }
 
     updateBackProgress(backEvent.getProgress());
   }
@@ -131,7 +133,9 @@ public void onAnimationEnd(Animator animation) {
   }
 
   public void cancelBackProgress() {
-    super.onCancelBackProgress();
+    if (super.onCancelBackProgress() == null) {
+      return;
+    }
 
     Animator animator = createResetScaleAnimator();
     animator.setDuration(cancelDuration);

lib/java/com/google/android/material/motion/MaterialMainContainerBackHelper.java

@@ -99,7 +99,9 @@ public void startBackProgress(float touchY, @Nullable View collapsedView) {
 
   public void updateBackProgress(
       @NonNull BackEventCompat backEvent, @Nullable View collapsedView, float collapsedCornerSize) {
-    super.onUpdateBackProgress(backEvent);
+    if (super.onUpdateBackProgress(backEvent) == null) {
+      return;
+    }
 
     if (collapsedView != null && collapsedView.getVisibility() != View.INVISIBLE) {
       collapsedView.setVisibility(View.INVISIBLE);
@@ -150,7 +152,9 @@ public void finishBackProgress(long duration, @Nullable View collapsedView) {
   }
 
   public void cancelBackProgress(@Nullable View collapsedView) {
-    super.onCancelBackProgress();
+    if (super.onCancelBackProgress() == null) {
+      return;
+    }
 
     AnimatorSet cancelAnimatorSet = createResetScaleAndTranslationAnimator(collapsedView);
     if (view instanceof ClippableRoundedCornerLayout) {

lib/java/com/google/android/material/motion/MaterialSideContainerBackHelper.java

@@ -72,7 +72,9 @@ public void startBackProgress(@NonNull BackEventCompat backEvent) {
   }
 
   public void updateBackProgress(@NonNull BackEventCompat backEvent, @GravityInt int gravity) {
-    super.onUpdateBackProgress(backEvent);
+    if (super.onUpdateBackProgress(backEvent) == null) {
+      return;
+    }
 
     boolean leftSwipeEdge = backEvent.getSwipeEdge() == BackEventCompat.EDGE_LEFT;
     updateBackProgress(backEvent.getProgress(), leftSwipeEdge, gravity);
@@ -155,7 +157,9 @@ public void onAnimationEnd(Animator animation) {
   }
 
   public void cancelBackProgress() {
-    super.onCancelBackProgress();
+    if (super.onCancelBackProgress() == null) {
+      return;
+    }
 
     AnimatorSet cancelAnimatorSet = new AnimatorSet();
     cancelAnimatorSet.playTogether(