How can one display multiple Fragments in a ViewPager according to the screen size; if it is a small device, it would display 1 Fragment in one screen. If it is a tablet in landscape mode, it would display 2 Fragment in a single screen, next to each other. If it is a tablet in portrait mode, it would display 1 Fragment?
Inside your ViewPagerAdapter class, override getPageWidth(). It returns a float (default of 1) with the amount of space each page should take up. Changing this value, for example, to .5f will have two fragments appear in the same window.
@Override public float getPageWidth(int position) {
return(1f/simultaneousPages);
}
In addition, setOffscreenPageLimit() should be increased. Its default is one, which means now that we show two pages, not enough fragments will be loaded into memory in the background. As a general rule, this should be twice the amount of pages on each screen.
In MainActivity.java (or whatever activity uses your ViewPagerAdapter)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from activity_main.xml
setContentView(R.layout.activity_main);
// Locate the viewpager in activity_main.xml
ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
// Set the ViewPagerAdapter into ViewPager
viewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
// Load extra pages into memory for smooth transitions
viewPager.setOffscreenPageLimit(2*simultaneousPages);
}
To change the view based on screen size, simply change the simultaneousPages variable as appropriate. More on detecting physical screen sizes.
Note: This method will cause problems with PagerTitleStrip and PagerTabStrip. The "current tab" that appears as selected will show as whatever fragment is the furthest left on your view.
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