[android-developers] Re: ViewPager does not respect WRAP_CONTENT?

Hi,

Couldn't you just also add the linearlayout (with its textview) to the relative layout in (2) as you did in (1) ?

And specifically, add and remove the linear layout to the collection in your instantiate & destroy item methods instead of just the text view.

Regards

On Saturday, November 23, 2013 7:11:43 AM UTC+11, 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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