Display spinner only on the last page of Viewpager - android

I have 3 fragments in my viewpager and I want to show a spinner item on my toolbar's menu on the last page. So if I am going from 2 -> 3 the spinner should become visible but if I go from 3 -> 2, it should become invisible. I know I have to add an onPageChangeListener to the viewpager but I am not sure how to determine which was the last page. How can I do it?


In MainActivity where you have used ViewPager use below method
//visible spinner when 3rd fragment is visible
viewPagerFloor.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if(position==2){
spinner.setVisibility(View.VISIBLE);
}else{
spinner.setVisibility(View.GONE);
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});

Related

How can I change the title of an android activity based on the Fragment in ViewPager2/TabView

I am working on an app and when I slide to the next tab I would like to change the title of the screen to match the Tab!

You can use registerOnPageChangeCallback in ViewPager2 to detect page swipes. In ViewPager2s host(for example host Activity) implement this event and when onPageSelected is called change the title of host Activity. In onPageSelected method you can get current position of ViewPager2 and based on position set your title.
viewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
super.onPageScrolled(position, positionOffset, positionOffsetPixels);
}
#Override
public void onPageSelected(int position) {
super.onPageSelected(position);
// Set title of Activity based on the position of Fragment
}
#Override
public void onPageScrollStateChanged(int state) {
super.onPageScrollStateChanged(state);
}
});

get data to viewPager fragment from its fragments

I am using viewPager for my custom Tablayout. I have two fragments, when viewPager activity was created , it should get the data from one of the fragment and have to display it on the tabs as unread count.
but I am getting data at scrolling. how can I over come this issue ?. please help me.
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
PendingPlusPendingForUploadFiles frage = new PendingPlusPendingForUploadFiles();
System.out.println("====c value===" + frage.count);
}
#Override
public void onPageSelected(int position) {
// previousTabPosition = position;
viewPager.setCurrentItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});

you can onResume(); method in the Fragment get it!

How to execute a block of code when a certain fragment is shown?

I've set up a pager with 3 fragments, I want to execute an specific block of code when fragment #2 is shown but problem is that onCreate/onResume methods from this fragment execute when fragment #1 is shown. I understand that the logic behind this is doing work ahead for when fragment#2 is actually needed, but how can I do if I need something to be done specifically when fragment#2 is shown?

You can implement an OnPageChangeListener, override OnPageSelected and set it on the ViewPager this way:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (position == 1) { // Meaning the position of the 2nd Fragment
doSomeCode();
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});

Show progress of page Scrolling in a android viewpager

I want to show page progress in top of a viewpager in android. The progress bar will become blue while you scrolling to next screen.
Any help??

You can use the OnPageChangeListener() method to set a ViewPager.OnPageChangeListener which can listen for when you scroll the viewpager to get to another page or when you simply scroll the viewpager.
Example:
mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//Write code to change progressbar when page is scrolled here.
}
#Override
public void onPageSelected(int position) {
//Write code to change progressbar when page is changed here
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
See these references for more information.
Reference: http://developer.android.com/reference/android/support/v4/view/ViewPager.html
http://developer.android.com/reference/android/support/v4/view/ViewPager.OnPageChangeListener.html

Viewpager scrolling finish event

I have a viewpager that dislapys text views. I have header layout above it. What i want is to hide or display this header when the user click on the screen. but not when the scrolling is occur. I tried the ViewPager.onPageChangeListener. But with no success. What i need is how to know when the swapping between pages finishes. The onPageScrollStateChange didnt help i create an instance variable to hold the state and keep updating it when this method call so i can use it in my onclick listener to now if the page is scrolling or not but with no success

mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
if(ViewPager.SCROLL_STATE_IDLE == state){
//Scrolling finished. Do something.
}
}
});

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