下面的代码滚动4页就好了.我的问题是滚动页面时不会触发onPageScrolled事件.无论我是否使用myPager.SetOffsccreenPageLimit(4)命令,都会发生这种情况.阅读文档之后,我理解当我实现MyPagerAdapter类中包含的ViewPager.OnPageChangeListener时,应该触发事件.我究竟做错了什么？
谢谢,
加里布莱克利
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MyPagerAdapter adapter = new MyPagerAdapter();
ViewPager myPager = (ViewPager) findViewById(R.id.mysevenpanelpager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(0);
myPager.setOffscreenPageLimit(4);
}
private class MyPagerAdapter extends PagerAdapter
implements ViewPager.OnPageChangeListener {
public int getCount() {
return 4;
}
public Object instantiateItem(View collection,int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.left;
break;
case 1:
resId = R.layout.gps;
break;
case 2:
resId = R.layout.map;
break;
case 3:
resId = R.layout.right;
break;
}
View view = inflater.inflate(resId,null);
((ViewPager) collection).addView(view,0);
return view;
}
@Override
public void destroyItem(View arg0,int arg1,Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
@Override
public void onPageScrollStateChanged(int arg0) {
int myint = 9;
myint = myint * 2;
}
@Override
public void onPageScrolled(int arg0,float arg1,int arg2) {
int myint = 9;
myint = myint * 2;
}
@Override
public void onPageSelected(int arg0) {
int myint = 9;
myint = myint * 2;
}
}
解决方法
您还需要使用setOnPageChangeListener()设置侦听器.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MyPagerAdapter adapter = new MyPagerAdapter();
ViewPager myPager = (ViewPager) findViewById(R.id.mysevenpanelpager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(0);
myPager.setOffscreenPageLimit(4);
myPager.setOnPageChangeListener(adapter); // This line here
}
