Android viewpager在最后一页滑动之后跳转到主页面的实例代码

先给大家说下实现思路

主要有是两个监听：

一是addonpagechangelistener();二是setontouchlistener()；

addonpagechangelistener()主要是为了获取position(滑动到了第几页)

setontouchlistener()主要是判断在最后一页中是否向左滑动了，然后进入主页

在没给大家分享代码之前，先给大家展示下效果图：

主要功能代码

addonpagechangelistener();
viewpager.addonpagechangelistener(new viewpager.onpagechangelistener() {
@override
public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {
}
@override
public void onpageselected(int position) {
currentitem = position;//获取位置，即第几页
log.i("guide","监听改变"+position);
}
@override
public void onpagescrollstatechanged(int state) {
}
}); 
setontouchlistener()；
viewpager.setontouchlistener(new view.ontouchlistener() {
float startx;
float starty;//没有用到
float endx;
float endy;//没有用到
@override
public boolean ontouch(view v, motionevent event) {
switch (event.getaction()){
case motionevent.action_down:
startx=event.getx();
starty=event.gety();
break;
case motionevent.action_up:
endx=event.getx();
endy=event.gety();
windowmanager windowmanager= (windowmanager) getapplicationcontext().getsystemservice(context.window_service);
//获取屏幕的宽度
point size = new point();
windowmanager.getdefaultdisplay().getsize(size);
int width=size.x;
//首先要确定的是，是否到了最后一页，然后判断是否向左滑动，并且滑动距离是否符合，我这里的判断距离是屏幕宽度的4分之一（这里可以适当控制）
if(currentitem==(imageviews.size()-1)&&startx-endx>=(width/4)){
log.i(log,"进入了触摸");
gotomainactivity();//进入主页
overridependingtransition(r.anim.slide_in_right,r.anim.slide_in_left);//这部分代码是切换activity时的动画，看起来就不会很生硬
}
break;
}
return false;
}
});

以下是全部代码

guideactivity
package com.tc.mobileshop;
import android.content.context;
import android.content.intent;
import android.graphics.point;
import android.support.v4.view.pageradapter;
import android.support.v4.view.viewpager;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.util.log;
import android.view.display;
import android.view.motionevent;
import android.view.view;
import android.view.viewgroup;
import android.view.windowmanager;
import android.widget.imageview;
import com.tc.mobileshop.utils.displayutils;
import java.util.arraylist;
import java.util.list;
public class guideactivity extends appcompatactivity {
private static final string log = "guideactivity";
int touchcount;
int currentitem;
list<integer> imageidlist;
list<imageview> imageviews;
viewpager viewpager;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_guide);
//初始化引导数据
initguidedata();
//初始化引导页
initguideview();
//初始化分页控件
iniview();
}
/**
* 初始化引导页数据
*/
private void initguidedata() {
imageidlist = new arraylist();
imageidlist.add(r.mipmap.apk_img1);
imageidlist.add(r.mipmap.apk_img2);
imageidlist.add(r.mipmap.apk_img3);
}
/**
* 初始化引导页
*/
private void initguideview() {
imageviews = new arraylist<>();
for (int i = 0; i < imageidlist.size(); i++) {
imageviews.add(new imageview(this));
}
}
/**
* 初始化分页控件
*/
private void iniview() {
viewpager = (viewpager) findviewbyid(r.id.guide_pager);
viewpager.setadapter(new guideadapter());
viewpager.addonpagechangelistener(new viewpager.onpagechangelistener() {
@override
public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {
}
@override
public void onpageselected(int position) {
currentitem = position;
log.i("guide","监听改变"+position);
}
@override
public void onpagescrollstatechanged(int state) {
}
});
viewpager.setontouchlistener(new view.ontouchlistener() {
float startx;
float starty;
float endx;
float endy;
@override
public boolean ontouch(view v, motionevent event) {
switch (event.getaction()){
case motionevent.action_down:
startx=event.getx();
starty=event.gety();
break;
case motionevent.action_up:
endx=event.getx();
endy=event.gety();
windowmanager windowmanager= (windowmanager) getapplicationcontext().getsystemservice(context.window_service);
//获取屏幕的宽度
point size = new point();
windowmanager.getdefaultdisplay().getsize(size);
int width=size.x;
//首先要确定的是，是否到了最后一页，然后判断是否向左滑动，并且滑动距离是否符合，我这里的判断距离是屏幕宽度的4分之一（这里可以适当控制）
if(currentitem==(imageviews.size()-1)&&startx-endx>0&&startx-endx>=(width/4)){
log.i(log,"进入了触摸");
gotomainactivity();
overridependingtransition(r.anim.slide_in_right,r.anim.slide_in_left);
}
break;
}
return false;
}
});
}
private void gotomainactivity() {
intent intent=new intent(this,mainactivity.class);
startactivity(intent);
finish();
}
/**
* viewpager适配器
*/
private class guideadapter extends pageradapter {
@override
public int getcount() {
return imageviews.size();
}
/**
* 判断当前分页是不是view
* 由于viewpager里面的分页可以填入fragment
*
* @param view
* @param object
* @return
*/
@override
public boolean isviewfromobject(view view, object object) {
return view == object;
}
/**
* 清理内存
* 从第一页滑动到第二页，此时第一页的内存应该释放
*
* @param container
* @param position
* @param object
*/
@override
public void destroyitem(viewgroup container, int position, object object) {
container.removeview(imageviews.get(position));//释放滑动过后的前一页
}
/**
* 得到---->暂时是没有用的
*
* @param object
* @return
*/
@override
public int getitemposition(object object) {
return super.getitemposition(object);
}
/**
* 初始化分页
*
* @param container
* @param position
* @return
*/
@override
public object instantiateitem(viewgroup container, int position) {
imageview imageview = imageviews.get(position);
imageview.setimageresource(imageidlist.get(position));
viewgroup.layoutparams viewlayoutparams = new viewgroup.layoutparams
(
displayutils.dip2px(guideactivity.this, 170),
displayutils.dip2px(guideactivity.this, 200)
);
container.addview(imageview,viewlayoutparams);//设置图片的宽高
return imageview;
}
}
}

以下为动画资源代码

slide_in_left.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="1000"
android:fromxdelta="0%p"
android:toxdelta="-100%"
/>
</set> 
slide_in_right.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="1000"
android:fromxdelta="100%p"
android:toxdelta="0"
/>
</set>

以上所述是小编给大家介绍的android viewpager在最后一页滑动之后跳转到主页面的实例代码，希望对大家有所帮助