The ViewPager specified WRAP_CONTENT as its width.
What content?
The ViewPager can show more than one page and only one is visible at a
time. If it had to choose the 'content' to use to figure out how wide the
WRAP_CONTENT width should be, which page should it use?
WRAP_CONTENT doesn't make sense for a ViewPager.
ViewPager should have a fixed width, either through MATCH_PARENT or through
a set number of pixels (dpi). If the ViewPager shouldn't occupy the entire
width of the screen, you could (for example) use a horizontal LinearLayout
with three child views: Two plain Views; one on the left, one on the right;
One ViewPager in the middle. Set the layout_widths to all of them to 0dp
and assign an appropriate layout_weight to all three of them.
On Friday, November 22, 2013 3:11:43 PM UTC-5, Ab wrote:
>
> I would like to create a ViewPager whose width wrap's to its contents, and
> is centered horizontally in it's parent. The first code snippet uses a
> LinearLayout to create this effect, as shown in the first screenshot. The
> second code snippet is my attempt to do this with a ViewPager instead of
> the LinearLayout, but the result is not the desired behavior, as shown in
> the second screenshot.
>
> Any suggestions as to how I create the first effect, but using a ViewPager?
>
> @Override
> protected void onCreate(Bundle savedInstanceState)
> {
> super.onCreate(savedInstanceState);
>
> textView = new TextView(this);
> textView.setLayoutParams(new
> ViewGroup.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
> LinearLayout.LayoutParams.WRAP_CONTENT));
> textView.setText("abcabcabcabcabc");
> textView.setBackgroundColor(Color.YELLOW);
>
> LinearLayout llayout = new LinearLayout(this);
> llayout.setBackgroundColor(Color.BLUE);
> RelativeLayout.LayoutParams layoutParams = new
> RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
> RelativeLayout.LayoutParams.MATCH_PARENT);
> layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
> llayout.setLayoutParams(layoutParams);
> llayout.addView(textView);
>
> layout = new RelativeLayout(this);
> layout.setLayoutParams(new
> ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
> ViewGroup.LayoutParams.MATCH_PARENT));
> layout.setBackgroundColor(Color.GREEN);
> layout.addView(llayout);
>
> setContentView(layout);
> }
>
>
> @Override
> protected void onCreate(Bundle savedInstanceState)
> {
> super.onCreate(savedInstanceState);
>
> textView = new TextView(this);
> textView.setLayoutParams(new
> ViewGroup.LayoutParams(ViewPager.LayoutParams.WRAP_CONTENT,
> ViewPager.LayoutParams.WRAP_CONTENT));
> textView.setText("abcabcabcabcabc");
> textView.setBackgroundColor(Color.YELLOW);
>
> ViewPager pager = new ViewPager(this);
> pager.setBackgroundColor(Color.BLUE);
> RelativeLayout.LayoutParams layoutParams = new
> RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
> RelativeLayout.LayoutParams.FILL_PARENT);
> layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
> pager.setLayoutParams(layoutParams);
> pager.setAdapter(new ViewPagerAdapter());
>
> layout = new RelativeLayout(this);
> layout.setLayoutParams(new
> ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
> ViewGroup.LayoutParams.MATCH_PARENT));
> layout.setBackgroundColor(Color.GREEN);
> layout.addView(pager);
>
> setContentView(layout);
> }
>
> class ViewPagerAdapter extends PagerAdapter
> {
> @Override
> public int getCount()
> {
> return 1;
> }
>
> public Object instantiateItem(ViewGroup collection, int
> position)
> {
> collection.addView(textView, 0);
> return textView;
> }
>
> @Override
> public void destroyItem(ViewGroup collection, int position,
> Object view)
> {
> collection.removeView((View) view);
> }
>
> @Override
> public boolean isViewFromObject(View view, Object object)
> {
> return (view==object);
> }
>
> @Override
> public void finishUpdate(ViewGroup arg0) {}
>
>
> @Override
> public void restoreState(Parcelable arg0, ClassLoader arg1) {}
>
> @Override
> public Parcelable saveState()
> {
> return null;
> }
>
> @Override
> public void startUpdate(ViewGroup arg0) {}
> }
>
> ![enter image description here][1]
>
> ![enter image description here][2]
>
>
> [1]: http://i.stack.imgur.com/6Ajm7.png
> [2]: http://i.stack.imgur.com/qWYQY.png
>
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