android - How can make my ViewPager load only one page at a time ie setOffscreenPageLimit(0);

Question

I understand the lowest number I can give setOffscreenPageLimit(int) is 1. but I need to load one page at a time because memory problems.

Am i going to have to use the old style tabhost etc? or is there a way/hack I can make my viewPager load one page at a time?

My Adapter extends BaseAdapter with the ViewHolder patern.

Answer 1

I was having the same problem and I found the solution for it:

Steps:

1) First Download the CustomViewPager Class from this link.

2) Use that class as mentioned below:

In Java:

CustomViewPager mViewPager;
mViewPager = (CustomViewPager) findViewById(R.id.swipePager);
mViewPager.setOffscreenPageLimit(0);

In XML:

<com.yourpackagename.CustomViewPager 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swipePager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

Now only one page will be loaded at once.

P.S: As per the question's requirement, I have posted the solution for Viewpager. I haven't tried the same with TabLayout yet. If I will find any solution for that I will update the answer.

In this file, KeyEventCompat is used it may not found by the android studio because KeyEnentCompat class was deprecated in API level 26.0.0 so you need to replace KeyEventCompat to event for more details you can view https://developer.android.com/sdk/support_api_diff/26.0.0-alpha1/changes/android.support.v4.view.KeyEventCompat