圆形ViewPager。他们应该第一轮后段不工作 [英] Circular ViewPager. Fragments don't work as they supposed to after first round
问题描述
好了,所以我需要循环ViewPager。我有很艰难的时期来实现它。现在,我已经实现了它,它工作正常至于圆形滚动的关注。但我注意到一个problem.Which是,经过第一轮的滚动片段不工作。我有三个片段,里面还一个按钮。巴顿工作在第一轮,但是当我回来的第一页按钮不起作用。
P.S我用伪造的网页技术,使viewpager圆形。
下面是code
mViewPager.setAdapter(新PagerAdapter(getSupportFragmentManager(),这个));
//mViewPager.setOnPageChangeListener(new CircularViewPagerHandler(mViewPager));
mViewPager.setCurrentItem(1,FALSE);
mViewPager.addOnPageChangeListener(新ViewPager.OnPageChangeListener(){
@覆盖
公共无效onPageScrolled(INT位置,浮positionOffset,诠释positionOffsetPixels){ } @覆盖
公共无效使用onPageSelected(INT位置){
如果(位置== 0){
mViewPager.setCurrentItem(3,FALSE);
Log.d(TAG,
第一页前刷卡,循环和复位到最后一页。);
}否则如果(位置== 4){
mViewPager.setCurrentItem(1,FALSE);
Log.d(TAG,
刷卡超出了最后一页,循环和复位到第一页。);
}
} @覆盖
公共无效onPageScrollStateChanged(INT状态){
Log.d(onPageScrollState,状态:+状态);
当前是INT = mViewPager.getCurrentItem();
如果(当前是== 1){
imgCenter.setImageResource(R.drawable.take_ride);
imgLeft.setImageResource(R.drawable.give_ride);
imgRight.setImageResource(R.drawable.setting);
}
如果(当前是== 2){
imgCenter.setImageResource(R.drawable.setting);
imgRight.setImageResource(R.drawable.take_ride);
imgLeft.setImageResource(R.drawable.give_ride);
}
如果(当前是== 3){
imgCenter.setImageResource(R.drawable.give_ride);
imgLeft.setImageResource(R.drawable.take_ride);
imgRight.setImageResource(R.drawable.setting); }
}
});
下面是PagerAdapter类
公共类PagerAdapter扩展FragmentPagerAdapter {上下文mcontext;公共PagerAdapter(FragmentManager FM,上下文的背景下){
超(FM);
mcontext =背景;
}@覆盖
公共片段的getItem(INT位置){
如果(位置== 0){
返回新HomeFragment2();
}
否则如果(位置== 1){
返回新HomeFragment();
}
否则如果(位置== 2){
返回新SettingFragment();
}
否则如果(位置== 3){
返回新HomeFragment2();
}
其他
返回新HomeFragment();
}@覆盖
公众诠释的getCount(){
返回5;
}
}
我创建了一个简单的测试应用与您 PagerAdapter
和简单的片段
s的一个按钮
:
,它工作正常!
我在这里上传源$ C $ C ,这样你就可以检查出来,看看是否有与你有什么区别。
作为片段
的我用:
公共类碎裂扩展android.support.v4.app.Fragment { @Nullable
@覆盖
公共查看onCreateView(LayoutInflater吹气,@Nullable的ViewGroup容器,@Nullable捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout.fragment_a,集装箱,FALSE);
rootView.findViewById(R.id.button).setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
Snackbar.make(V,片段A,Snackbar.LENGTH_SHORT).show();
}
});
返回rootView;
}
}
所以,我可以推荐
-
有一些虚拟的人(像上面的)更换您的片段。如果一切正常 - 问题是在
片段
code,而不是在循环ViewPager -
如果它仍然无法正常工作 - 我想尝试,而不是重新创建片段多次 - 一旦他们创建和存储:
公共类PagerAdapter扩展FragmentPagerAdapter {
上下文mcontext;
片段[]片段;
公共PagerAdapter(FragmentManager FM,上下文的背景下,片段[]片段){
超(FM);
mcontext =背景;
this.fragments =片段;
} @覆盖
公共片段的getItem(INT位置){
返回片段[位置]
} @覆盖
公众诠释的getCount(){
返回fragments.length;
}
}而在
活动
:片段[] =片段{
Fragment.instantiate(此,FragmentC.class.getName()),
Fragment.instantiate(此,FragmentA.class.getName()),
Fragment.instantiate(此,FragmentB.class.getName()),
Fragment.instantiate(此,FragmentC.class.getName()),
Fragment.instantiate(此,FragmentA.class.getName()),
};
.....
viewPager.setAdapter(新PagerAdapter(getSupportFragmentManager(),这一点,片段));
让我知道,如果它可以帮助!
Ok, so i needed circular ViewPager. I was having really hard time to implement it. Now that i have implemented it and it is working fine as far as circular scroll is concern. But i have notice a problem.Which is, after first round of scroll fragments don't work. I have three Fragments with a button inside them. Button works in first round but when i come back to first page button doesn't work. p.s i used fake pages technique to make viewpager circular.
Here is code
mViewPager.setAdapter(new PagerAdapter(getSupportFragmentManager(), this));
//mViewPager.setOnPageChangeListener(new CircularViewPagerHandler(mViewPager));
mViewPager.setCurrentItem(1, false);
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
if (position == 0) {
mViewPager.setCurrentItem(3, false);
Log.d("TAG",
"Swiped before first page, looping and resetting to last page.");
} else if (position == 4) {
mViewPager.setCurrentItem(1, false);
Log.d("TAG",
"Swiped beyond last page, looping and resetting to first page.");
}
}
@Override
public void onPageScrollStateChanged(int state) {
Log.d("onPageScrollState", "state:" + state);
int currentPage = mViewPager.getCurrentItem();
if(currentPage==1){
imgCenter.setImageResource(R.drawable.take_ride);
imgLeft.setImageResource(R.drawable.give_ride);
imgRight.setImageResource(R.drawable.setting);
}
if(currentPage==2){
imgCenter.setImageResource(R.drawable.setting);
imgRight.setImageResource(R.drawable.take_ride);
imgLeft.setImageResource(R.drawable.give_ride);
}
if (currentPage==3){
imgCenter.setImageResource(R.drawable.give_ride);
imgLeft.setImageResource(R.drawable.take_ride);
imgRight.setImageResource(R.drawable.setting);
}
}
});
here is PagerAdapter class
public class PagerAdapter extends FragmentPagerAdapter {
Context mcontext;
public PagerAdapter(FragmentManager fm, Context context) {
super(fm);
mcontext = context;
}
@Override
public Fragment getItem(int position) {
if (position == 0) {
return new HomeFragment2();
}
else if(position==1){
return new HomeFragment();
}
else if (position == 2) {
return new SettingFragment();
}
else if(position==3){
return new HomeFragment2();
}
else
return new HomeFragment();
}
@Override
public int getCount() {
return 5;
}
}
I've created a simple test-app with you PagerAdapter
and simple Fragment
s with a Button
:
And it works fine!
I've uploaded the source code here, so you can check it out and see if there's any difference with yours.
As a Fragment
's I used:
public class FragmentA extends android.support.v4.app.Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
rootView.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Hi, fragment A", Snackbar.LENGTH_SHORT).show();
}
});
return rootView;
}
}
So what I can recommend
replace your fragments with some dummy ones (like the one above). If it works - the issue is in the
Fragment
code, not in the Circular ViewPagerIf it still doesn't work - I'd try to instead of re-creating fragments multiple times - create them once and store:
public class PagerAdapter extends FragmentPagerAdapter { Context mcontext; Fragment [] fragments; public PagerAdapter(FragmentManager fm, Context context, Fragment [] fragments) { super(fm); mcontext = context; this.fragments = fragments; } @Override public Fragment getItem(int position) { return fragments[position]; } @Override public int getCount() { return fragments.length; } }
And in
Activity
:Fragment[] fragments = { Fragment.instantiate(this, FragmentC.class.getName()), Fragment.instantiate(this, FragmentA.class.getName()), Fragment.instantiate(this, FragmentB.class.getName()), Fragment.instantiate(this, FragmentC.class.getName()), Fragment.instantiate(this, FragmentA.class.getName()), }; ..... viewPager.setAdapter(new PagerAdapter(getSupportFragmentManager(), this, fragments));
Let me know, if it helps!
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