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2
3 import java.util.ArrayList;
4
5 import android.content.Context;
6 import android.util.AttributeSet;
7 import android.view.MotionEvent;
8 import android.view.View;
9 import android.view.ViewGroup;
10 import android.widget.HorizontalScrollView;
11 /**
12 *
13 * @author XINYE
14 *
15 */
16 public class MyScrollView extends HorizontalScrollView {
17 private int subChildCount = 0;
18 private ViewGroup firstChild = null;
19 private int downX = 0;
20 private int currentPage = 0;
21 private ArrayList<integer> pointList = new ArrayList<integer>();
22
23 public MyScrollView(Context context, AttributeSet attrs, int defStyle) {
24 super(context, attrs, defStyle);
25 init();
26 }
27
28
29 public MyScrollView(Context context, AttributeSet attrs) {
30 super(context, attrs);
31 init();
32 }
33
34 public MyScrollView(Context context) {
35 super(context);
36 init();
37 }
38 private void init() {
39 setHorizontalScrollBarEnabled(false);
40 }
41 @Override
42 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
43 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
44 receiveChildInfo();
45 }
46 public void receiveChildInfo() {
47
48 firstChild = (ViewGroup) getChildAt(0);
49 if(firstChild != null){
50 subChildCount = firstChild.getChildCount();
51 for(int i = 0;i < subChildCount;i++){
52 if(((View)firstChild.getChildAt(i)).getWidth() > 0){
53 pointList.add(((View)firstChild.getChildAt(i)).getLeft());
54 }
55 }
56 }
57
58 }
59 @Override
60 public boolean onTouchEvent(MotionEvent ev) {
61 switch (ev.getAction()) {
62 case MotionEvent.ACTION_DOWN:
63 downX = (int) ev.getX();
64 break;
65 case MotionEvent.ACTION_MOVE:{
66
67 }break;
68 case MotionEvent.ACTION_UP:
69 case MotionEvent.ACTION_CANCEL:{
70 if( Math.abs((ev.getX() - downX)) > getWidth() / 4){
71 if(ev.getX() - downX > 0){
72 smoothScrollToPrePage();
73 }else{
74 smoothScrollToNextPage();
75 }
76 }else{
77 smoothScrollToCurrent();
78 }
79 return true;
80 }
81 }
82 return super.onTouchEvent(ev);
83 }
84
85 private void smoothScrollToCurrent() {
86 smoothScrollTo(pointList.get(currentPage), 0);
87 }
88
89 private void smoothScrollToNextPage() {
90 if(currentPage < subChildCount - 1){
91 currentPage++;
92 smoothScrollTo(pointList.get(currentPage), 0);
93 }
94 }
95
96 private void smoothScrollToPrePage() {
97 if(currentPage > 0){
98 currentPage--;
99 smoothScrollTo(pointList.get(currentPage), 0);
100 }
101 }
102 /**
103 * 下一页
104 */
105 public void nextPage(){
106 smoothScrollToNextPage();
107 }
108 /**
109 * 上一页
110 */
111 public void prePage(){
112 smoothScrollToPrePage();
113 }
114 /**
115 * 跳转到指定的页面
116 * @param page
117 * @return
118 */
119 public boolean gotoPage(int page){
120 if(page > 0 && page < subChildCount - 1){
121 smoothScrollTo(pointList.get(page), 0);
122 currentPage = page;
123 return true;
124 }
125 return false;
126 }
127 }</integer></integer>
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