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Java设计模式 —— 建造者模式（Builder）
定义
建造模式：将一个复杂对象的构建与他的表示相分离，使得同样的构建过程可以创建不同的表示。
特征：
- 方便用户创建复杂的对象（不需要知道实现过程）
- 代码复用性 & 封装性（将对象构建过程和细节进行封装 & 复用）
代码实现
如果一个类有很多属性，此时为此类写一个Builder内部类，来辅助建造该类。
class Phone {
private String screen;
private String camera;
private String cpu;
private String battery;
public static Builder builder() {
return new Builder();
}
public static class Builder {
private Phone phone = new Phone();
public Builder screen(String screen) {
phone.screen = screen;
return this;
}
public Builder camera(String camera) {
phone.camera = camera;
return this;
}
public Builder cpu(String cpu) {
phone.cpu = cpu;
return this;
}
public Builder battery(String battery) {
phone.battery = battery;
return this;
}
public Phone build() {
return phone;
}
}
}
android中建造者模式
xref: /frameworks/base/core/java/android/app/AlertDialog.java
在AlertDialog.java类中多了一个Builder内部类
451 public static class Builder {
452 private final AlertController.AlertParams P;
453
454 /**
455 * Creates a builder for an alert dialog that uses the default alert
456 * dialog theme.
457 * <p>
458 * The default alert dialog theme is defined by
459 * {@link android.R.attr#alertDialogTheme} within the parent
460 * {@code context}'s theme.
461 *
462 * @param context the parent context
463 */
464 public Builder(Context context) {
465 this(context, resolveDialogTheme(context, ResourceId.ID_NULL));
466 }
467
468 /**
469 * Creates a builder for an alert dialog that uses an explicit theme
470 * resource.
471 * <p>
472 * The specified theme resource ({@code themeResId}) is applied on top
473 * of the parent {@code context}'s theme. It may be specified as a
474 * style resource containing a fully-populated theme, such as
475 * {@link android.R.style#Theme_Material_Dialog}, to replace all
476 * attributes in the parent {@code context}'s theme including primary
477 * and accent colors.
478 * <p>
479 * To preserve attributes such as primary and accent colors, the
480 * {@code themeResId} may instead be specified as an overlay theme such
481 * as {@link android.R.style#ThemeOverlay_Material_Dialog}. This will
482 * override only the window attributes necessary to style the alert
483 * window as a dialog.
484 * <p>
485 * Alternatively, the {@code themeResId} may be specified as {@code 0}
486 * to use the parent {@code context}'s resolved value for
487 * {@link android.R.attr#alertDialogTheme}.
488 *
489 * @param context the parent context
490 * @param themeResId the resource ID of the theme against which to inflate
491 * this dialog, or {@code 0} to use the parent
492 * {@code context}'s default alert dialog theme
493 */
494 public Builder(Context context, int themeResId) {
495 P = new AlertController.AlertParams(new ContextThemeWrapper(
496 context, resolveDialogTheme(context, themeResId)));
497 }
498
499 /**
500 * Returns a {@link Context} with the appropriate theme for dialogs created by this Builder.
501 * Applications should use this Context for obtaining LayoutInflaters for inflating views
502 * that will be used in the resulting dialogs, as it will cause views to be inflated with
503 * the correct theme.
504 *
505 * @return A Context for built Dialogs.
506 */
507 public Context getContext() {
508 return P.mContext;
509 }
510
511 /**
512 * Set the title using the given resource id.
513 *
514 * @return This Builder object to allow for chaining of calls to set methods
515 */
516 public Builder setTitle(@StringRes int titleId) {
517 P.mTitle = P.mContext.getText(titleId);
518 return this;
519 }
520
521 /**
522 * Set the title displayed in the {@link Dialog}.
523 *
524 * @return This Builder object to allow for chaining of calls to set methods
525 */
526 public Builder setTitle(CharSequence title) {
527 P.mTitle = title;
528 return this;
529 }
530
531 /**
532 * Set the title using the custom view {@code customTitleView}.
533 * <p>
534 * The methods {@link #setTitle(int)} and {@link #setIcon(int)} should
535 * be sufficient for most titles, but this is provided if the title
536 * needs more customization. Using this will replace the title and icon
537 * set via the other methods.
538 * <p>
539 * <strong>Note:</strong> To ensure consistent styling, the custom view
540 * should be inflated or constructed using the alert dialog's themed
541 * context obtained via {@link #getContext()}.
542 *
543 * @param customTitleView the custom view to use as the title
544 * @return this Builder object to allow for chaining of calls to set
545 * methods
546 */
547 public Builder setCustomTitle(View customTitleView) {
548 P.mCustomTitleView = customTitleView;
549 return this;
550 }
551
552 /**
553 * Set the message to display using the given resource id.
554 *
555 * @return This Builder object to allow for chaining of calls to set methods
556 */
557 public Builder setMessage(@StringRes int messageId) {
558 P.mMessage = P.mContext.getText(messageId);
559 return this;
560 }
561
562 /**
563 * Set the message to display.
564 *
565 * @return This Builder object to allow for chaining of calls to set methods
566 */
567 public Builder setMessage(CharSequence message) {
568 P.mMessage = message;
569 return this;
570 }
571
572 /**
573 * Set the resource id of the {@link Drawable} to be used in the title.
574 * <p>
575 * Takes precedence over values set using {@link #setIcon(Drawable)}.
576 *
577 * @return This Builder object to allow for chaining of calls to set methods
578 */
579 public Builder setIcon(@DrawableRes int iconId) {
580 P.mIconId = iconId;
581 return this;
582 }
583
584 /**
585 * Set the {@link Drawable} to be used in the title.
586 * <p>
587 * <strong>Note:</strong> To ensure consistent styling, the drawable
588 * should be inflated or constructed using the alert dialog's themed
589 * context obtained via {@link #getContext()}.
590 *
591 * @return this Builder object to allow for chaining of calls to set
592 * methods
593 */
594 public Builder setIcon(Drawable icon) {
595 P.mIcon = icon;
596 return this;
597 }
598
599 /**
600 * Set an icon as supplied by a theme attribute. e.g.
601 * {@link android.R.attr#alertDialogIcon}.
602 * <p>
603 * Takes precedence over values set using {@link #setIcon(int)} or
604 * {@link #setIcon(Drawable)}.
605 *
606 * @param attrId ID of a theme attribute that points to a drawable resource.
607 */
608 public Builder setIconAttribute(@AttrRes int attrId) {
609 TypedValue out = new TypedValue();
610 P.mContext.getTheme().resolveAttribute(attrId, out, true);
611 P.mIconId = out.resourceId;
612 return this;
613 }
614
615 /**
616 * Set a listener to be invoked when the positive button of the dialog is pressed.
617 * @param textId The resource id of the text to display in the positive button
618 * @param listener The {@link DialogInterface.OnClickListener} to use.
619 *
620 * @return This Builder object to allow for chaining of calls to set methods
621 */
622 public Builder setPositiveButton(@StringRes int textId, final OnClickListener listener) {
623 P.mPositiveButtonText = P.mContext.getText(textId);
624 P.mPositiveButtonListener = listener;
625 return this;
626 }
627
628 /**
629 * Set a listener to be invoked when the positive button of the dialog is pressed.
630 * @param text The text to display in the positive button
631 * @param listener The {@link DialogInterface.OnClickListener} to use.
632 *
633 * @return This Builder object to allow for chaining of calls to set methods
634 */
635 public Builder setPositiveButton(CharSequence text, final OnClickListener listener) {
636 P.mPositiveButtonText = text;
637 P.mPositiveButtonListener = listener;
638 return this;
639 }
640
641 /**
642 * Set a listener to be invoked when the negative button of the dialog is pressed.
643 * @param textId The resource id of the text to display in the negative button
644 * @param listener The {@link DialogInterface.OnClickListener} to use.
645 *
646 * @return This Builder object to allow for chaining of calls to set methods
647 */
648 public Builder setNegativeButton(@StringRes int textId, final OnClickListener listener) {
649 P.mNegativeButtonText = P.mContext.getText(textId);
650 P.mNegativeButtonListener = listener;
651 return this;
652 }
653
654 /**
655 * Set a listener to be invoked when the negative button of the dialog is pressed.
656 * @param text The text to display in the negative button
657 * @param listener The {@link DialogInterface.OnClickListener} to use.
658 *
659 * @return This Builder object to allow for chaining of calls to set methods
660 */
661 public Builder setNegativeButton(CharSequence text, final OnClickListener listener) {
662 P.mNegativeButtonText = text;
663 P.mNegativeButtonListener = listener;
664 return this;
665 }
666
667 /**
668 * Set a listener to be invoked when the neutral button of the dialog is pressed.
669 * @param textId The resource id of the text to display in the neutral button
670 * @param listener The {@link DialogInterface.OnClickListener} to use.
671 *
672 * @return This Builder object to allow for chaining of calls to set methods
673 */
674 public Builder setNeutralButton(@StringRes int textId, final OnClickListener listener) {
675 P.mNeutralButtonText = P.mContext.getText(textId);
676 P.mNeutralButtonListener = listener;
677 return this;
678 }
679
680 /**
681 * Set a listener to be invoked when the neutral button of the dialog is pressed.
682 * @param text The text to display in the neutral button
683 * @param listener The {@link DialogInterface.OnClickListener} to use.
684 *
685 * @return This Builder object to allow for chaining of calls to set methods
686 */
687 public Builder setNeutralButton(CharSequence text, final OnClickListener listener) {
688 P.mNeutralButtonText = text;
689 P.mNeutralButtonListener = listener;
690 return this;
691 }
692
693 /**
694 * Sets whether the dialog is cancelable or not. Default is true.
695 *
696 * @return This Builder object to allow for chaining of calls to set methods
697 */
698 public Builder setCancelable(boolean cancelable) {
699 P.mCancelable = cancelable;
700 return this;
701 }
702
703 /**
704 * Sets the callback that will be called if the dialog is canceled.
705 *
706 * <p>Even in a cancelable dialog, the dialog may be dismissed for reasons other than
707 * being canceled or one of the supplied choices being selected.
708 * If you are interested in listening for all cases where the dialog is dismissed
709 * and not just when it is canceled, see
710 * {@link #setOnDismissListener(android.content.DialogInterface.OnDismissListener) setOnDismissListener}.</p>
711 * @see #setCancelable(boolean)
712 * @see #setOnDismissListener(android.content.DialogInterface.OnDismissListener)
713 *
714 * @return This Builder object to allow for chaining of calls to set methods
715 */
716 public Builder setOnCancelListener(OnCancelListener onCancelListener) {
717 P.mOnCancelListener = onCancelListener;
718 return this;
719 }
720
721 /**
722 * Sets the callback that will be called when the dialog is dismissed for any reason.
723 *
724 * @return This Builder object to allow for chaining of calls to set methods
725 */
726 public Builder setOnDismissListener(OnDismissListener onDismissListener) {
727 P.mOnDismissListener = onDismissListener;
728 return this;
729 }
730
731 /**
732 * Sets the callback that will be called if a key is dispatched to the dialog.
733 *
734 * @return This Builder object to allow for chaining of calls to set methods
735 */
736 public Builder setOnKeyListener(OnKeyListener onKeyListener) {
737 P.mOnKeyListener = onKeyListener;
738 return this;
739 }
740
741 /**
742 * Set a list of items to be displayed in the dialog as the content, you will be notified of the
743 * selected item via the supplied listener. This should be an array type i.e. R.array.foo
744 *
745 * @return This Builder object to allow for chaining of calls to set methods
746 */
747 public Builder setItems(@ArrayRes int itemsId, final OnClickListener listener) {
748 P.mItems = P.mContext.getResources().getTextArray(itemsId);
749 P.mOnClickListener = listener;
750 return this;
751 }
752
753 /**
754 * Set a list of items to be displayed in the dialog as the content, you will be notified of the
755 * selected item via the supplied listener.
756 *
757 * @return This Builder object to allow for chaining of calls to set methods
758 */
759 public Builder setItems(CharSequence[] items, final OnClickListener listener) {
760 P.mItems = items;
761 P.mOnClickListener = listener;
762 return this;
763 }
764
765 /**
766 * Set a list of items, which are supplied by the given {@link ListAdapter}, to be
767 * displayed in the dialog as the content, you will be notified of the
768 * selected item via the supplied listener.
769 *
770 * @param adapter The {@link ListAdapter} to supply the list of items
771 * @param listener The listener that will be called when an item is clicked.
772 *
773 * @return This Builder object to allow for chaining of calls to set methods
774 */
775 public Builder setAdapter(final ListAdapter adapter, final OnClickListener listener) {
776 P.mAdapter = adapter;
777 P.mOnClickListener = listener;
778 return this;
779 }
780
781 /**
782 * Set a list of items, which are supplied by the given {@link Cursor}, to be
783 * displayed in the dialog as the content, you will be notified of the
784 * selected item via the supplied listener.
785 *
786 * @param cursor The {@link Cursor} to supply the list of items
787 * @param listener The listener that will be called when an item is clicked.
788 * @param labelColumn The column name on the cursor containing the string to display
789 * in the label.
790 *
791 * @return This Builder object to allow for chaining of calls to set methods
792 */
793 public Builder setCursor(final Cursor cursor, final OnClickListener listener,
794 String labelColumn) {
795 P.mCursor = cursor;
796 P.mLabelColumn = labelColumn;
797 P.mOnClickListener = listener;
798 return this;
799 }
800
801 /**
802 * Set a list of items to be displayed in the dialog as the content,
803 * you will be notified of the selected item via the supplied listener.
804 * This should be an array type, e.g. R.array.foo. The list will have
805 * a check mark displayed to the right of the text for each checked
806 * item. Clicking on an item in the list will not dismiss the dialog.
807 * Clicking on a button will dismiss the dialog.
808 *
809 * @param itemsId the resource id of an array i.e. R.array.foo
810 * @param checkedItems specifies which items are checked. It should be null in which case no
811 * items are checked. If non null it must be exactly the same length as the array of
812 * items.
813 * @param listener notified when an item on the list is clicked. The dialog will not be
814 * dismissed when an item is clicked. It will only be dismissed if clicked on a
815 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
816 *
817 * @return This Builder object to allow for chaining of calls to set methods
818 */
819 public Builder setMultiChoiceItems(@ArrayRes int itemsId, boolean[] checkedItems,
820 final OnMultiChoiceClickListener listener) {
821 P.mItems = P.mContext.getResources().getTextArray(itemsId);
822 P.mOnCheckboxClickListener = listener;
823 P.mCheckedItems = checkedItems;
824 P.mIsMultiChoice = true;
825 return this;
826 }
827
828 /**
829 * Set a list of items to be displayed in the dialog as the content,
830 * you will be notified of the selected item via the supplied listener.
831 * The list will have a check mark displayed to the right of the text
832 * for each checked item. Clicking on an item in the list will not
833 * dismiss the dialog. Clicking on a button will dismiss the dialog.
834 *
835 * @param items the text of the items to be displayed in the list.
836 * @param checkedItems specifies which items are checked. It should be null in which case no
837 * items are checked. If non null it must be exactly the same length as the array of
838 * items.
839 * @param listener notified when an item on the list is clicked. The dialog will not be
840 * dismissed when an item is clicked. It will only be dismissed if clicked on a
841 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
842 *
843 * @return This Builder object to allow for chaining of calls to set methods
844 */
845 public Builder setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems,
846 final OnMultiChoiceClickListener listener) {
847 P.mItems = items;
848 P.mOnCheckboxClickListener = listener;
849 P.mCheckedItems = checkedItems;
850 P.mIsMultiChoice = true;
851 return this;
852 }
853
854 /**
855 * Set a list of items to be displayed in the dialog as the content,
856 * you will be notified of the selected item via the supplied listener.
857 * The list will have a check mark displayed to the right of the text
858 * for each checked item. Clicking on an item in the list will not
859 * dismiss the dialog. Clicking on a button will dismiss the dialog.
860 *
861 * @param cursor the cursor used to provide the items.
862 * @param isCheckedColumn specifies the column name on the cursor to use to determine
863 * whether a checkbox is checked or not. It must return an integer value where 1
864 * means checked and 0 means unchecked.
865 * @param labelColumn The column name on the cursor containing the string to display in the
866 * label.
867 * @param listener notified when an item on the list is clicked. The dialog will not be
868 * dismissed when an item is clicked. It will only be dismissed if clicked on a
869 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
870 *
871 * @return This Builder object to allow for chaining of calls to set methods
872 */
873 public Builder setMultiChoiceItems(Cursor cursor, String isCheckedColumn, String labelColumn,
874 final OnMultiChoiceClickListener listener) {
875 P.mCursor = cursor;
876 P.mOnCheckboxClickListener = listener;
877 P.mIsCheckedColumn = isCheckedColumn;
878 P.mLabelColumn = labelColumn;
879 P.mIsMultiChoice = true;
880 return this;
881 }
882
883 /**
884 * Set a list of items to be displayed in the dialog as the content, you will be notified of
885 * the selected item via the supplied listener. This should be an array type i.e.
886 * R.array.foo The list will have a check mark displayed to the right of the text for the
887 * checked item. Clicking on an item in the list will not dismiss the dialog. Clicking on a
888 * button will dismiss the dialog.
889 *
890 * @param itemsId the resource id of an array i.e. R.array.foo
891 * @param checkedItem specifies which item is checked. If -1 no items are checked.
892 * @param listener notified when an item on the list is clicked. The dialog will not be
893 * dismissed when an item is clicked. It will only be dismissed if clicked on a
894 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
895 *
896 * @return This Builder object to allow for chaining of calls to set methods
897 */
898 public Builder setSingleChoiceItems(@ArrayRes int itemsId, int checkedItem,
899 final OnClickListener listener) {
900 P.mItems = P.mContext.getResources().getTextArray(itemsId);
901 P.mOnClickListener = listener;
902 P.mCheckedItem = checkedItem;
903 P.mIsSingleChoice = true;
904 return this;
905 }
906
907 /**
908 * Set a list of items to be displayed in the dialog as the content, you will be notified of
909 * the selected item via the supplied listener. The list will have a check mark displayed to
910 * the right of the text for the checked item. Clicking on an item in the list will not
911 * dismiss the dialog. Clicking on a button will dismiss the dialog.
912 *
913 * @param cursor the cursor to retrieve the items from.
914 * @param checkedItem specifies which item is checked. If -1 no items are checked.
915 * @param labelColumn The column name on the cursor containing the string to display in the
916 * label.
917 * @param listener notified when an item on the list is clicked. The dialog will not be
918 * dismissed when an item is clicked. It will only be dismissed if clicked on a
919 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
920 *
921 * @return This Builder object to allow for chaining of calls to set methods
922 */
923 public Builder setSingleChoiceItems(Cursor cursor, int checkedItem, String labelColumn,
924 final OnClickListener listener) {
925 P.mCursor = cursor;
926 P.mOnClickListener = listener;
927 P.mCheckedItem = checkedItem;
928 P.mLabelColumn = labelColumn;
929 P.mIsSingleChoice = true;
930 return this;
931 }
932
933 /**
934 * Set a list of items to be displayed in the dialog as the content, you will be notified of
935 * the selected item via the supplied listener. The list will have a check mark displayed to
936 * the right of the text for the checked item. Clicking on an item in the list will not
937 * dismiss the dialog. Clicking on a button will dismiss the dialog.
938 *
939 * @param items the items to be displayed.
940 * @param checkedItem specifies which item is checked. If -1 no items are checked.
941 * @param listener notified when an item on the list is clicked. The dialog will not be
942 * dismissed when an item is clicked. It will only be dismissed if clicked on a
943 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
944 *
945 * @return This Builder object to allow for chaining of calls to set methods
946 */
947 public Builder setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener) {
948 P.mItems = items;
949 P.mOnClickListener = listener;
950 P.mCheckedItem = checkedItem;
951 P.mIsSingleChoice = true;
952 return this;
953 }
954
955 /**
956 * Set a list of items to be displayed in the dialog as the content, you will be notified of
957 * the selected item via the supplied listener. The list will have a check mark displayed to
958 * the right of the text for the checked item. Clicking on an item in the list will not
959 * dismiss the dialog. Clicking on a button will dismiss the dialog.
960 *
961 * @param adapter The {@link ListAdapter} to supply the list of items
962 * @param checkedItem specifies which item is checked. If -1 no items are checked.
963 * @param listener notified when an item on the list is clicked. The dialog will not be
964 * dismissed when an item is clicked. It will only be dismissed if clicked on a
965 * button, if no buttons are supplied it's up to the user to dismiss the dialog.
966 *
967 * @return This Builder object to allow for chaining of calls to set methods
968 */
969 public Builder setSingleChoiceItems(ListAdapter adapter, int checkedItem, final OnClickListener listener) {
970 P.mAdapter = adapter;
971 P.mOnClickListener = listener;
972 P.mCheckedItem = checkedItem;
973 P.mIsSingleChoice = true;
974 return this;
975 }
976
977 /**
978 * Sets a listener to be invoked when an item in the list is selected.
979 *
980 * @param listener the listener to be invoked
981 * @return this Builder object to allow for chaining of calls to set methods
982 * @see AdapterView#setOnItemSelectedListener(android.widget.AdapterView.OnItemSelectedListener)
983 */
984 public Builder setOnItemSelectedListener(final AdapterView.OnItemSelectedListener listener) {
985 P.mOnItemSelectedListener = listener;
986 return this;
987 }
988
989 /**
990 * Set a custom view resource to be the contents of the Dialog. The
991 * resource will be inflated, adding all top-level views to the screen.
992 *
993 * @param layoutResId Resource ID to be inflated.
994 * @return this Builder object to allow for chaining of calls to set
995 * methods
996 */
997 public Builder setView(int layoutResId) {
998 P.mView = null;
999 P.mViewLayoutResId = layoutResId;
1000 P.mViewSpacingSpecified = false;
1001 return this;
1002 }
1003
1004 /**
1005 * Sets a custom view to be the contents of the alert dialog.
1006 * <p>
1007 * When using a pre-Holo theme, if the supplied view is an instance of
1008 * a {@link ListView} then the light background will be used.
1009 * <p>
1010 * <strong>Note:</strong> To ensure consistent styling, the custom view
1011 * should be inflated or constructed using the alert dialog's themed
1012 * context obtained via {@link #getContext()}.
1013 *
1014 * @param view the view to use as the contents of the alert dialog
1015 * @return this Builder object to allow for chaining of calls to set
1016 * methods
1017 */
1018 public Builder setView(View view) {
1019 P.mView = view;
1020 P.mViewLayoutResId = 0;
1021 P.mViewSpacingSpecified = false;
1022 return this;
1023 }
1024
1025 /**
1026 * Sets a custom view to be the contents of the alert dialog and
1027 * specifies additional padding around that view.
1028 * <p>
1029 * When using a pre-Holo theme, if the supplied view is an instance of
1030 * a {@link ListView} then the light background will be used.
1031 * <p>
1032 * <strong>Note:</strong> To ensure consistent styling, the custom view
1033 * should be inflated or constructed using the alert dialog's themed
1034 * context obtained via {@link #getContext()}.
1035 *
1036 * @param view the view to use as the contents of the alert dialog
1037 * @param viewSpacingLeft spacing between the left edge of the view and
1038 * the dialog frame
1039 * @param viewSpacingTop spacing between the top edge of the view and
1040 * the dialog frame
1041 * @param viewSpacingRight spacing between the right edge of the view
1042 * and the dialog frame
1043 * @param viewSpacingBottom spacing between the bottom edge of the view
1044 * and the dialog frame
1045 * @return this Builder object to allow for chaining of calls to set
1046 * methods
1047 *
1048 * @hide Remove once the framework usages have been replaced.
1049 * @deprecated Set the padding on the view itself.
1050 */
1051 @Deprecated
1052 public Builder setView(View view, int viewSpacingLeft, int viewSpacingTop,
1053 int viewSpacingRight, int viewSpacingBottom) {
1054 P.mView = view;
1055 P.mViewLayoutResId = 0;
1056 P.mViewSpacingSpecified = true;
1057 P.mViewSpacingLeft = viewSpacingLeft;
1058 P.mViewSpacingTop = viewSpacingTop;
1059 P.mViewSpacingRight = viewSpacingRight;
1060 P.mViewSpacingBottom = viewSpacingBottom;
1061 return this;
1062 }
1063
1064 /**
1065 * Sets the alert dialog to use the inverse background, regardless of
1066 * what the contents is.
1067 *
1068 * @param useInverseBackground whether to use the inverse background
1069 * @return this Builder object to allow for chaining of calls to set methods
1070 * @deprecated This flag is only used for pre-Material themes. Instead,
1071 * specify the window background using on the alert dialog
1072 * theme.
1073 */
1074 @Deprecated
1075 public Builder setInverseBackgroundForced(boolean useInverseBackground) {
1076 P.mForceInverseBackground = useInverseBackground;
1077 return this;
1078 }
1079
1080 /**
1081 * @hide
1082 */
1083 public Builder setRecycleOnMeasureEnabled(boolean enabled) {
1084 P.mRecycleOnMeasure = enabled;
1085 return this;
1086 }
1087
1088
1089 /**
1090 * Creates an {@link AlertDialog} with the arguments supplied to this
1091 * builder.
1092 * <p>
1093 * Calling this method does not display the dialog. If no additional
1094 * processing is needed, {@link #show()} may be called instead to both
1095 * create and display the dialog.
1096 */
1097 public AlertDialog create() {
1098 // Context has already been wrapped with the appropriate theme.
1099 final AlertDialog dialog = new AlertDialog(P.mContext, 0, false);
1100 P.apply(dialog.mAlert);
1101 dialog.setCancelable(P.mCancelable);
1102 if (P.mCancelable) {
1103 dialog.setCanceledOnTouchOutside(true);
1104 }
1105 dialog.setOnCancelListener(P.mOnCancelListener);
1106 dialog.setOnDismissListener(P.mOnDismissListener);
1107 if (P.mOnKeyListener != null) {
1108 dialog.setOnKeyListener(P.mOnKeyListener);
1109 }
1110 return dialog;
1111 }
1112
1113 /**
1114 * Creates an {@link AlertDialog} with the arguments supplied to this
1115 * builder and immediately displays the dialog.
1116 * <p>
1117 * Calling this method is functionally identical to:
1118 * <pre>
1119 * AlertDialog dialog = builder.create();
1120 * dialog.show();
1121 * </pre>
1122 */
1123 public AlertDialog show() {
1124 final AlertDialog dialog = create();
1125 dialog.show();
1126 return dialog;
1127 }
1128 }
感谢
segmentfault: 建造者模式
菜鸟教程： 建造者模式
百度百科：建造者模式
简书：https://www.jianshu.com/p/3d1c9ffb0a28