Gesturedetector package gesture detection swipe up and down

The project needs to detect the top slide of the ListView to hide the tops of the view controls, and there have been many implementation cases on the web before. Find a good example of a package on git and write it down.

Gesturedetector is a gesture detection class with a simpleongesturelistener gesture listener inside.

Define an abstract class Simpledetector, inherit Gesturedetector.simpleongesturelistener abstract class, implement View.ontouchlistener interface. What good does it do? First the ListView as long as Setontouchlistener, the definition of this abstract class Simpledetector set into good. Then this class of simpledetector only need to be responsible for detecting the slip or slide event, the logic is separated.

In order to animate the top view control of a ListView, it is necessary to define another class that inherits the abstract Simpledetector class, which handles animations or other logical events that need to be performed when the slide is slipping in this class alone. The Simpledetector abstract class above provides two abstract methods for subclasses to implement. So the whole package looks perfect.

[Java]View Plaincopy

2. Public abstract class Simpledetector extends Gesturedetector.simpleongesturelistener implements view.ontouchlistener{
6. Private final gesturedetector mdetector;
8. private final int mslop; The meaning of slop sloshing
10. private Boolean mignore; Whether to ignore listening up and down scrolling
12. private float mdowny;
16. public abstract void Onscrolldown ();
18. public abstract void Onscrollup ();
22. Public Simpledetector (context context) {
24. Mdetector = New Gesturedetector (context, this);
26. Mslop = Getslop (context);
28. }
32. Public Boolean Isignore () {
34. return mignore;
36. }
38. public void Setignore (boolean mignore) {
40. This.mignore = Mignore;
42. }
44. protected int Getslop (context context) {
46. if (Build.VERSION.SDK_INT < build.version_codes. FROYO) {
48. return Viewconfiguration.gettouchslop () * 2;
50. }else{
52. return Viewconfiguration.get (context). Getscaledpagingtouchslop ();
54. }
56. }
60. @Override
62. Public Boolean ondown (Motionevent e) {
64. //TODO auto-generated method stub
66. Mdowny = E.gety ();
68. return false;
70. }
74. @Override
76. Public Boolean onscroll (motionevent E1, motionevent E2, float Distancex,
78. float Distancey) {  
80. //TODO auto-generated method stub
82. if (mignore)
84. return false;
86. if (distancey==0) {
88. Mdowny = E2.gety ();
90. }
94. Float distance = mdowny-e2.gety ();
98. if (distance <-mslop) {
100. Onscrolldown ();
102. }Else if (distance > Mslop) {
104. Onscrollup ();
106. }
108. return false;
110. }
114. @Override
116. Public Boolean OnTouch (View V, motionevent event) {
118. //TODO auto-generated method stub
120. Mdetector.ontouchevent (event);
122. return false;
124. }
128. }

Handling animated display hidden event logic processing class

[Java]View Plaincopy

2. Public class Showhideonscroll extends Simpledetector implements animatorlistener{
6. Private final View MView;
8. private int mshowanimation;
10. private int mhideanimation;
12. private int mtranslationy;
14. private int curshowhide = 0;
18. Public showhideonscroll (view view,int translationy) {
20. Super (View.getcontext ());
22. MView = view;
24. Mtranslationy = Translationy;
26. }
30. Public showhideonscroll (view view,int show,int hide,int translationy) {
32. Super (View.getcontext ());
34. MView = view;
36. Mshowanimation = Show;
38. Mhideanimation = hide;
40. Mtranslationy = Translationy;
42. }
46. @Override
48. public void Onscrolldown () {
50. Mview.setvisibility (view.visible);
52. Animateshow ();
54. Curshowhide = 0;
56. }
60. @Override
62. public void Onscrollup () {
64. Mview.setvisibility (view.visible);
66. Animatehide ();
68. Curshowhide = 1;
70. }
72. private void Animateshow () {
74. Mview.settranslationy (Mtranslationy);
76. Mview.animate (). Translationy (0). Setinterpolator (new Acceleratedecelerateinterpolator ())
78. . Setstartdelay (0). Setduration (+). Setlistener (Showhideonscroll.   This). Start ();
80. Setignore (true);
82. }
84. private void Animatehide () {
86. Mview.settranslationy (0);
88. Mview.animate (). Translationy (Mtranslationy). Setinterpolator (new Acceleratedecelerateinterpolator ())
90. . Setstartdelay (0). Setduration (+). Setlistener (Showhideonscroll.   This). Start ();
92. Setignore (true);
94. }
98. @Override
100. public void Onanimationstart (Animator animation) {
102. //TODO auto-generated method stub
106. }
110. @Override
112. public void Onanimationend (Animator animation) {
114. //TODO auto-generated method stub
116. if (curshowhide==0) {
118. Mview.setvisibility (view.visible);
120. Mview.settranslationy (0);
122. }Else if (curshowhide = = 1) {
124. Mview.setvisibility (view.invisible);
126. Mview.settranslationy (Mtranslationy);
128. }
130. Setignore (false);
132. }
136. @Override
138. public void Onanimationcancel (Animator animation) {
140. //TODO auto-generated method stub
144. }
148. @Override
150. public void Onanimationrepeat (Animator animation) {
152. //TODO auto-generated method stub
156. }
164. }

Gesturedetector package gesture detection swipe up and down