Android新特性页面之ViewPager拖拽到最后一页再拖拽打开其他Activity(三种方法)

 android新特性页面，viewpager拖拽到最后一页再拖拽打开其他activity.实现的方式有很多，效果比较好的就是到了最后一页再拖拽出现禁止蓝色条时再跳转activity

方式一：拿到viewpager的边界条edgeeffectcompat，判断是否到了边界（获取edgeeffectcompat通过反射，方法来自网络最后边会给出原文）

/** 
* 初始化view 
*/ 
private void initview(){ 
pager = (viewpager) findviewbyid(r.id.help_viewpages); 
try { 
field leftedgefield = pager.getclass().getdeclaredfield("mleftedge"); 
field rightedgefield = pager.getclass().getdeclaredfield("mrightedge"); 
if (leftedgefield != null && rightedgefield != null) { 
leftedgefield.setaccessible(true); 
rightedgefield.setaccessible(true); 
leftedge = (edgeeffectcompat) leftedgefield.get(pager); 
rightedge = (edgeeffectcompat) rightedgefield.get(pager); 
} 
} catch (exception e) { 
e.printstacktrace(); 
} 
pager.setonpagechangelistener(new onpagechangelistener() { 
@override 
public void onpagescrollstatechanged(int arg0) { 
if(rightedge!=null&&!rightedge.isfinished()){//到了最后一张并且还继续拖动，出现蓝色限制边条了 
startactivity(new intent(helpactivity.this, mainactivity.class)); 
helpactivity.this.finish(); 
} 
} 
@override 
public void onpageselected(int arg0) { 
} 
@override 
public void onpagescrolled(int arg0, float arg1, int arg2) { 
} 
}); 

方法二：也是在onpagechangelistener里判断当前滚动的页数是不是最后一页

pager.setonpagechangelistener(new onpagechangelistener() { 
@override 
public void onpageselected(int arg0) { 
} 
@override 
public void onpagescrolled(int arg0, float arg1, int arg2) { 
} 
@override 
public void onpagescrollstatechanged(int arg0) { 
//判断当前页数是否==总页数 
} 
}); 

在此小编推荐方法一，方法二需要判断pagescrollstatechanged(int arg0)的滚动状态，也可以实现一样的效果

转载高手viewpager在拖拽到左边和右边的时候，禁止显示黄色或者蓝色的渐变图片的解决方法（以备自己以后查阅）

package com.example.viewpagertest; 
import java.lang.reflect.field; 
import java.util.arraylist; 
import java.util.list; 
import android.app.activity; 
import android.os.bundle; 
import android.support.v4.view.pageradapter; 
import android.support.v4.view.viewpager; 
import android.support.v4.view.viewpager.onpagechangelistener; 
import android.support.v4.widget.edgeeffectcompat; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.imageview; 
public class mainactivity extends activity implements onpagechangelistener { 
private viewpager viewpager; 
private list<imageview> views; 
private edgeeffectcompat leftedge; 
private edgeeffectcompat rightedge; 
private int[] ids = {r.drawable.iframe_4,r.drawable.iframe_5,r.drawable.iframe_6,r.drawable.iframe_7,r.drawable.iframe_8}; 
private myadapter adapter; 
@override 
protected void oncreate(bundle savedinstancestate) { 
super.oncreate(savedinstancestate); 
setcontentview(r.layout.activity_main); 
initview(); 
} 
private void initview() { 
viewpager = (viewpager) findviewbyid(r.id.viewpager); 
initviewpager(); 
initdata(); 
} 
private void initdata() { 
views = new arraylist<imageview>(); 
for(int i=0;i<ids.length;i++){ 
imageview iv = new imageview(this); 
iv.setimageresource(ids[i]); 
views.add(iv); 
} 
adapter = new myadapter(); 
viewpager.setadapter(adapter); 
viewpager.setonpagechangelistener(this); 
} 
class myadapter extends pageradapter{ 
@override 
public int getcount() { 
return views.size(); 
} 
@override 
public boolean isviewfromobject(view arg0, object arg1) { 
return arg0==arg1; 
} 
@override 
public void destroyitem(viewgroup container, int position, object object) { 
((viewpager)container).removeview(views.get(position)); 
} 
@override 
public object instantiateitem(viewgroup container, int position) { 
((viewpager)container).addview(views.get(position)); 
return views.get(position); 
} 
} 
@override 
public void onpagescrollstatechanged(int arg0) { 
} 
@override 
public void onpagescrolled(int arg0, float arg1, int arg2) { 
if (leftedge != null && rightedge != null) { 
leftedge.finish(); 
rightedge.finish(); 
leftedge.setsize(0, 0); 
rightedge.setsize(0, 0); 
} 
} 
@override 
public void onpageselected(int arg0) { 
} 
private void initviewpager() { 
try { 
field leftedgefield = viewpager.getclass().getdeclaredfield("mleftedge"); 
field rightedgefield = viewpager.getclass().getdeclaredfield("mrightedge"); 
if (leftedgefield != null && rightedgefield != null) { 
leftedgefield.setaccessible(true); 
rightedgefield.setaccessible(true); 
leftedge = (edgeeffectcompat) leftedgefield.get(viewpager); 
rightedge = (edgeeffectcompat) rightedgefield.get(viewpager); 
} 
} catch (exception e) { 
e.printstacktrace(); 
} 
} 
} 

以上所述是小编给大家介绍的android新特性页面之viewpager拖拽到最后一页再拖拽打开其他activity(三种方法)，希望对大家有所帮助