[TimePicker] Hide cancel button when it's not cancelable

Resolves #2245

PiperOrigin-RevId: 381268475

lib/java/com/google/android/material/timepicker/MaterialTimePicker.java

@@ -92,6 +92,7 @@ public final class MaterialTimePicker extends DialogFragment {
   static final String OVERRIDE_THEME_RES_ID = "TIME_PICKER_OVERRIDE_THEME_RES_ID";
 
   private MaterialButton modeButton;
+  private Button cancelButton;
 
   @InputMode private int inputMode = INPUT_MODE_CLOCK;
 
@@ -246,7 +247,7 @@ public void onClick(View v) {
           }
         });
 
-    Button cancelButton = root.findViewById(R.id.material_timepicker_cancel_button);
+    cancelButton = root.findViewById(R.id.material_timepicker_cancel_button);
     cancelButton.setOnClickListener(
         new OnClickListener() {
           @Override
@@ -257,6 +258,7 @@ public void onClick(View v) {
             dismiss();
           }
         });
+    updateCancelButtonVisibility();
 
     modeButton.setOnClickListener(
         new OnClickListener() {
@@ -296,6 +298,12 @@ public final void onDismiss(@NonNull DialogInterface dialogInterface) {
     super.onDismiss(dialogInterface);
   }
 
+  @Override
+  public void setCancelable(boolean cancelable) {
+    super.setCancelable(cancelable);
+    updateCancelButtonVisibility();
+  }
+
   private void updateInputMode(MaterialButton modeButton) {
     if (activePresenter != null) {
       activePresenter.hide();
@@ -309,6 +317,12 @@ private void updateInputMode(MaterialButton modeButton) {
     modeButton.setContentDescription(getResources().getString(buttonData.second));
   }
 
+  private void updateCancelButtonVisibility() {
+    if (cancelButton != null) {
+      cancelButton.setVisibility(isCancelable() ? View.VISIBLE : View.GONE);
+    }
+  }
+
   private TimePickerPresenter initializeOrRetrieveActivePresenterForMode(int mode) {
     if (mode == INPUT_MODE_CLOCK) {
       timePickerClockPresenter =