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)

/** 
* 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) { 
} 
}); 

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 
} 
}); 

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(); 
} 
} 
}