Example usage for android.support.v4.view PagerAdapter registerDataSetObserver

Introduction

In this page you can find the example usage for android.support.v4.view PagerAdapter registerDataSetObserver.

Prototype

void registerDataSetObserver(DataSetObserver observer) 

Source Link

Usage

From source file:com.qiscus.sdk.filepicker.util.TabLayoutHelper.java

private void handleOnAdapterChanged(ViewPager viewPager, PagerAdapter oldAdapter, PagerAdapter newAdapter) {
    if (this.viewPager != viewPager) {
        return;/*from  w w w  .  ja  va  2 s. c  om*/
    }

    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(internalDataSetObserver);
    }
    if (newAdapter != null) {
        newAdapter.registerDataSetObserver(internalDataSetObserver);
    }

    setTabsFromPagerAdapter(tabLayout, newAdapter, this.viewPager.getCurrentItem());
}

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From source file:at.linuxtage.companion.widgets.SlidingTabLayout.java

/**
 * Sets the associated view pager. The ViewPager must have an adapter set.
 * The SlidingTabLayout will then listen for changes and update the tabs automatically.
 *///from w  w w.j  av a 2 s. com
public void setViewPager(ViewPager viewPager) {
    if (mViewPager != null) {
        mViewPager.removeOnPageChangeListener(mPageChangeListener);
        mAdapter.unregisterDataSetObserver(mPagerAdapterObserver);
    }
    if (viewPager != null) {
        PagerAdapter adapter = viewPager.getAdapter();
        if (adapter == null) {
            throw new IllegalArgumentException("ViewPager does not have a PagerAdapter set");
        }
        mViewPager = viewPager;
        mAdapter = adapter;
        mPageChangeListener.reset();
        viewPager.addOnPageChangeListener(mPageChangeListener);
        adapter.registerDataSetObserver(mPagerAdapterObserver);
    } else {
        mViewPager = null;
        mAdapter = null;
    }
    notifyDataSetChanged();
}

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From source file:droidninja.filepicker.utils.TabLayoutHelper.java

protected void handleOnAdapterChanged(ViewPager viewPager, PagerAdapter oldAdapter, PagerAdapter newAdapter) {
    if (mViewPager != viewPager) {
        return;/*from ww  w  .  j a v a  2 s.  c om*/
    }

    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(mInternalDataSetObserver);
    }
    if (newAdapter != null) {
        newAdapter.registerDataSetObserver(mInternalDataSetObserver);
    }

    setTabsFromPagerAdapter(mTabLayout, newAdapter, mViewPager.getCurrentItem());
}

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From source file:org.dmfs.android.view.DrawablePagerTitleStrip.java

void updateAdapter(PagerAdapter oldAdapter, PagerAdapter newAdapter) {
    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(mPageListener);
        mWatchingAdapter = null;/*w w  w.  j a  va  2  s. c o m*/
    }
    if (newAdapter != null) {
        if (!(newAdapter instanceof IDrawableTitlePagerAdapter)) {
            throw new IllegalArgumentException("Adapter must implement IDrawableTitlePagerAdapter");
        }

        newAdapter.registerDataSetObserver(mPageListener);
        mWatchingAdapter = new WeakReference<PagerAdapter>(newAdapter);

        Context context = getContext();

        // TODO: we should determine the number of images dynamically
        int newCount = Math.max(1, Math.min(9, newAdapter.getCount()));

        if (mImageViews == null || mImageViews.length < newCount) {
            ImageView[] newImages = new ImageView[newCount];
            int start = 0;
            if (mImageViews != null) {
                System.arraycopy(mImageViews, 0, newImages, 0, mImageViews.length);
                start = mImageViews.length;
            }

            for (int i = start; i < newCount; ++i) {
                addView(newImages[i] = new ImageView(context));
            }
            mImageViews = newImages;
        } else if (mImageViews.length > newCount) {
            ImageView[] newImages = new ImageView[newCount];
            System.arraycopy(mImageViews, 0, newImages, 0, newCount);

            for (int i = newCount; i < mImageViews.length; ++i) {
                removeView(mImageViews[i]);
            }

            mImageViews = newImages;
        }
    } else {
        mImageViews = null;
    }

    if (mPager != null) {
        mLastKnownCurrentPage = -1;
        mLastKnownPositionOffset = -1;
        updateImages(mPager.getCurrentItem(), newAdapter);
        requestLayout();
    }
}

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From source file:com.itsronald.widget.ViewPagerIndicator.java

/**
 * Update the ViewPager adapter being observed by the indicator. The
 * <p>//w  ww.j  a v  a 2 s.co  m
 * Taken from:
 * https://android.googlesource.com/platform/frameworks/support/+/nougat-release/v4/java/android/support/v4/view/PagerTitleStrip.java#319
 *
 * @param oldAdapter The previous adapter being tracked by the indicator.
 * @param newAdapter The previous adapter that should be tracked by the indicator.
 */
private void updateAdapter(@Nullable PagerAdapter oldAdapter, @Nullable PagerAdapter newAdapter) {
    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(pageListener);
        pagerAdapterRef = null;
    }
    if (newAdapter != null) {
        newAdapter.registerDataSetObserver(pageListener);
        pagerAdapterRef = new WeakReference<>(newAdapter);
    }
    if (viewPager != null) {
        lastKnownCurrentPage = -1;
        lastKnownPositionOffset = -1;
        updateIndicators(viewPager.getCurrentItem(), newAdapter);
        requestLayout();
    }
}

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From source file:com.mixiaoxiao.mxxedgeeffect.widget.MxxPagerTitleStrip.java

void updateAdapter(PagerAdapter oldAdapter, PagerAdapter newAdapter) {
    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(mPageListener);
        mWatchingAdapter = null;//www  .j  a  v  a2  s.  c o m
    }
    if (newAdapter != null) {
        newAdapter.registerDataSetObserver(mPageListener);
        mWatchingAdapter = new WeakReference<PagerAdapter>(newAdapter);
        mCircleIndicator.setItemCount(newAdapter.getCount());
    }
    if (mPager != null) {
        mLastKnownCurrentPage = -1;
        mLastKnownPositionOffset = -1;
        updateText(mPager.getCurrentItem(), newAdapter);
        requestLayout();
    }

}

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From source file:am.widget.tabstrip.TabStripHelper.java

private void onViewPagerAdapterChanged(@Nullable PagerAdapter oldAdapter, @Nullable PagerAdapter newAdapter) {
    if (mView instanceof TabStripView)
        ((TabStripView) mView).onViewPagerAdapterChanged(oldAdapter, newAdapter);
    else if (mView instanceof TabStripViewGroup)
        ((TabStripViewGroup) mView).onViewPagerAdapterChanged(oldAdapter, newAdapter);
    if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
        mPosition = 0;//from www.j av  a  2 s.  co  m
        mOffset = 0;
        if (oldAdapter != null)
            oldAdapter.unregisterDataSetObserver(this);
        if (newAdapter != null)
            newAdapter.registerDataSetObserver(this);
        if (mPager != null)
            mPosition = mPager.getCurrentItem();
        updateView(true);
    }
}

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From source file:com.am.pagergradienttab.view.PagerGradientTabStrip.java

void updateAdapter(PagerAdapter oldAdapter, PagerAdapter newAdapter) {
    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(mPageListener);
        mWatchingAdapter = null;/*from w w  w.j a  v  a  2 s . c o m*/
    }
    tabs.clear();
    if (newAdapter != null) {
        newAdapter.registerDataSetObserver(mPageListener);
        mWatchingAdapter = new WeakReference<PagerAdapter>(newAdapter);
        mLastKnownPosition = mPager.getCurrentItem();
        currectPager = mLastKnownPosition;
        nextPager = mLastKnownPosition;
        for (int i = 0; i < newAdapter.getCount(); i++) {
            tabs.add(newAdapter.getPageTitle(i).toString());
        }
    }
    if (mPager != null) {
        requestLayout();
    }

}

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From source file:com.github.shareme.gwsmaterialuikit.library.material.widget.TabPageIndicator.java

/**
 * Set the ViewPager associate with this indicator view.
 * @param view The ViewPager view.//from  w w w  . j a  v a2s  . c om
 */
public void setViewPager(@Nullable ViewPager view) {
    if (mViewPager == view)
        return;

    if (mViewPager != null) {
        mViewPager.removeOnPageChangeListener(this);
        PagerAdapter adapter = mViewPager.getAdapter();
        if (adapter != null)
            adapter.unregisterDataSetObserver(mObserver);
    }

    mViewPager = view;

    if (mViewPager != null) {
        PagerAdapter adapter = mViewPager.getAdapter();
        if (adapter == null)
            throw new IllegalStateException("ViewPager does not have adapter instance.");

        adapter.registerDataSetObserver(mObserver);

        mViewPager.addOnPageChangeListener(this);

        notifyDataSetChanged();
        onPageSelected(mViewPager.getCurrentItem());
    } else
        mTabContainer.removeAllViews();
}

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From source file:am.widget.basetabstrip.BaseTabStrip.java

/**
 * ?PagerAdapter//  w  w  w . jav  a2s . co m
 *
 * @param oldAdapter Adapter
 * @param newAdapter Adapter
 */
protected void bindPagerAdapter(PagerAdapter oldAdapter, PagerAdapter newAdapter) {
    if (oldAdapter != null) {
        oldAdapter.unregisterDataSetObserver(mPageListener);
        mWatchingAdapter = null;
    }
    if (newAdapter != null) {
        newAdapter.registerDataSetObserver(mPageListener);
        mWatchingAdapter = new WeakReference<>(newAdapter);
    }
    createItemBackgrounds();
    onBindPagerAdapter();
    checkCurrentItem();
    requestLayout();
    invalidate();
}

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