listFragment) {
17 | super(fm);
18 | this.listFragment=listFragment;
19 | }
20 |
21 | @Override
22 | public Fragment getItem(int i) {
23 | return listFragment.get(i);
24 | }
25 |
26 | @Override
27 | public int getCount() {
28 | return listFragment.size();
29 | }
30 |
31 |
32 |
33 | }
34 |
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/app/src/main/java/com/jack/loopviewpager/transformer/ABaseTransformer.java:
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1 | package com.jack.loopviewpager.transformer;
2 |
3 | import android.view.View;
4 |
5 | import androidx.viewpager.widget.ViewPager;
6 |
7 | public abstract class ABaseTransformer implements ViewPager.PageTransformer {
8 |
9 | /**
10 | * Called each {@link #transformPage(View, float)}.
11 | *
12 | * @param page
13 | * Apply the transformation to this page
14 | * @param position
15 | * Position of page relative to the current front-and-center position of the pager. 0 is front and
16 | * center. 1 is one full page position to the right, and -1 is one page position to the left.
17 | */
18 | protected abstract void onTransform(View page, float position);
19 |
20 | /**
21 | * Apply a property transformation to the given page. For most use cases, this method should not be overridden.
22 | * Instead use {@link #transformPage(View, float)} to perform typical transformations.
23 | *
24 | * @param page
25 | * Apply the transformation to this page
26 | * @param position
27 | * Position of page relative to the current front-and-center position of the pager. 0 is front and
28 | * center. 1 is one full page position to the right, and -1 is one page position to the left.
29 | */
30 | @Override
31 | public void transformPage(View page, float position) {
32 | onPreTransform(page, position);
33 | onTransform(page, position);
34 | onPostTransform(page, position);
35 | }
36 |
37 | /**
38 | * If the position offset of a fragment is less than negative one or greater than one, returning true will set the
39 | * fragment alpha to 0f. Otherwise fragment alpha is always defaulted to 1f.
40 | *
41 | * @return
42 | */
43 | protected boolean hideOffscreenPages() {
44 | return true;
45 | }
46 |
47 | /**
48 | * Indicates if the default animations of the view pager should be used.
49 | *
50 | * @return
51 | */
52 | protected boolean isPagingEnabled() {
53 | return false;
54 | }
55 |
56 | /**
57 | * Called each {@link #transformPage(View, float)} before {{@link #onTransform(View, float)}.
58 | *
59 | * The default implementation attempts to reset all view properties. This is useful when toggling transforms that do
60 | * not modify the same page properties. For instance changing from a transformation that applies rotation to a
61 | * transformation that fades can inadvertently leave a fragment stuck with a rotation or with some degree of applied
62 | * alpha.
63 | *
64 | * @param page
65 | * Apply the transformation to this page
66 | * @param position
67 | * Position of page relative to the current front-and-center position of the pager. 0 is front and
68 | * center. 1 is one full page position to the right, and -1 is one page position to the left.
69 | */
70 | protected void onPreTransform(View page, float position) {
71 | final float width = page.getWidth();
72 |
73 | page.setRotationX(0);
74 | page.setRotationY(0);
75 | page.setRotation(0);
76 | page.setScaleX(1);
77 | page.setScaleY(1);
78 | page.setPivotX(0);
79 | page.setPivotY(0);
80 | page.setTranslationY(0);
81 | page.setTranslationX(isPagingEnabled() ? 0f : -width * position);
82 |
83 | if (hideOffscreenPages()) {
84 | page.setAlpha(position <= -1f || position >= 1f ? 0f : 1f);
85 | // page.setEnabled(false);
86 | } else {
87 | // page.setEnabled(true);
88 | page.setAlpha(1f);
89 | }
90 | }
91 |
92 | /**
93 | * Called each {@link #transformPage(View, float)} after {@link #onTransform(View, float)}.
94 | *
95 | * @param page
96 | * Apply the transformation to this page
97 | * @param position
98 | * Position of page relative to the current front-and-center position of the pager. 0 is front and
99 | * center. 1 is one full page position to the right, and -1 is one page position to the left.
100 | */
101 | protected void onPostTransform(View page, float position) {
102 | }
103 |
104 | /**
105 | * Same as {@link Math#min(double, double)} without double casting, zero closest to infinity handling, or NaN support.
106 | *
107 | * @param val
108 | * @param min
109 | * @return
110 | */
111 | protected static final float min(float val, float min) {
112 | return val < min ? min : val;
113 | }
114 |
115 | }
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/app/src/main/java/com/jack/loopviewpager/transformer/AccordionTransformer.java:
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1 | package com.jack.loopviewpager.transformer;
2 |
3 | import android.view.View;
4 |
5 | /**
6 | * @author Jack
7 | */
8 | public class AccordionTransformer extends ABaseTransformer {
9 |
10 | @Override
11 | protected void onTransform(View view, float position) {
12 | view.setPivotX(position < 0 ? 0 : view.getWidth());
13 | view.setScaleX(position < 0 ? 1f + position : 1f - position);
14 | }
15 |
16 | }
17 |
18 |
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/app/src/main/res/drawable-v24/ic_launcher_foreground.xml:
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1 |
7 |
12 |
13 |
19 |