Android how to use Viewpager with OnTouchListener

Question

i am a coding beginner, so sorry for my bad explanation of the problem.

In my MainActivity I have a full screen Viewpager, which changes its content (the xml-file) every time I swipe left or right. These collection of views is defined in a enum, I have also used a CustomPagerAdapter for that. This works fine, but when I implement an onTouchListener in my MainActivity, the "swiping" doesn't work anymore.

Does anyone know, how to solve that?

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Main = (View) findViewById(R.id.MainActivity);
    viewPager = (ViewPager) findViewById(R.id.colorgroup);
    viewPager.setAdapter(new CustomPagerAdapter(this));
    View.OnTouchListener handleTouch = new View.OnTouchListener() {
    @Override
     public boolean onTouch(View v, MotionEvent event) {
            int x = (int) event.getX();
            int y = (int) event.getY();
            viewPager.setDrawingCacheEnabled(true);
            viewPager.buildDrawingCache();
            Bitmap bitmap = viewPager.getDrawingCache();
            int pixel = bitmap.getPixel(x, y);
            String hexColor = String.format( "#%02x%02x%02x", r, g, b );
            return true;
        }
    };
    viewPager.setOnTouchListener(handleTouch);
} 

public class CustomPagerAdapter extends PagerAdapter {

private Context mContext;

public CustomPagerAdapter(Context context) {
    mContext = context;
}

@Override
public Object instantiateItem(ViewGroup collection, int position) {
    CustomPagerEnum customPagerEnum = CustomPagerEnum.values()[position];
    LayoutInflater inflater = LayoutInflater.from(mContext);
    ViewGroup layout = (ViewGroup) inflater.inflate(customPagerEnum.getLayoutResId(), collection, false);
    collection.addView(layout);
    return layout;
}

@Override
public void destroyItem(ViewGroup collection, int position, Object view) {
    collection.removeView((View) view);
}

@Override
public int getCount() {
    return CustomPagerEnum.values().length;
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}

@Override
public CharSequence getPageTitle(int position) {
    CustomPagerEnum customPagerEnum = CustomPagerEnum.values()[position];
    return mContext.getString(customPagerEnum.getTitleResId());
}

}

public enum CustomPagerEnum {

YELLOW(R.string.YELLOW, R.layout.view_yellow),
PUCE(R.string.PUCE, R.layout.view_puce),
BROWN(R.string.BROWN, R.layout.view_brown),
GREEN(R.string.GREEN, R.layout.view_green),
CYAN(R.string.CYAN, R.layout.view_cyan),
BLUE(R.string.BLUE, R.layout.view_blue),
RED(R.string.RED, R.layout.view_red),
PINK(R.string.PINK, R.layout.view_pink),
PURPLE(R.string.PURPLE, R.layout.view_purple),
SLATE(R.string.SLATE, R.layout.view_slate),
GREY(R.string.GREY, R.layout.view_grey),
DARK(R.string.DARK, R.layout.view_dark);



    private int mTitleResId;
    private int mLayoutResId;

    CustomPagerEnum(int titleResId, int layoutResId) {
        mTitleResId = titleResId;
        mLayoutResId = layoutResId;
    }

    public int getTitleResId() {
        return mTitleResId;
    }

    public int getLayoutResId() {
        return mLayoutResId;
    }

}

Answer 1

You always return true from the onTouch() method. This signifies that your handler has consumed the touch event and so the event is not further processed. This results in the swipe never working. Return false instead.