android.support.v4.view.ViewPager#getAdapter ( )源码实例Demo

public static void setupWithViewPager(@NonNull final ViewPager viewPager,
                                      @NonNull final GroupScene groupScene,
                                      @NonNull final List<UserVisibleHintGroupScene> children) {
    if (viewPager.getAdapter() != null) {
        throw new IllegalArgumentException("ViewPager already have a adapter");
    }

    ScenePageAdapter scenePageAdapter = new ScenePageAdapter(groupScene) {

        @Override
        public int getCount() {
            return children.size();
        }

        @Override
        public UserVisibleHintGroupScene getItem(int position) {
            return children.get(position);
        }
    };
    viewPager.setAdapter(scenePageAdapter);
}
 

public void setViewPager(ViewPager view) {
    if (view == null) {
        removeAllViews();
        this.mViewPager = null;
    } else if (this.mViewPager != view) {
        if (this.mViewPager != null) {
            this.mViewPager.setOnPageChangeListener(null);
        }
        if (view.getAdapter() == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }
        this.mViewPager = view;
        view.setOnPageChangeListener(this);
        notifyDataSetChanged();
    }
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    final PagerAdapter adapter = view.getAdapter();
    if (adapter == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    view.setOnPageChangeListener(this);
    notifyDataSetChanged();
}
 

@Override
public void setViewPager(ViewPager viewPager) {
    if (mViewPager == viewPager) {
        return;
    }
    if (mViewPager != null) {
        //Clear us from the old pager.
        mViewPager.setOnPageChangeListener(null);
    }
    if (viewPager.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = viewPager;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
    post(new Runnable() {
        @Override public void run() {
            if (mFades) {
                post(mFadeRunnable);
            }
        }
    });
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    final PagerAdapter adapter = view.getAdapter();
    if (adapter == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    view.setOnPageChangeListener(this);
    notifyDataSetChanged();
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    PagerAdapter adapter = view.getAdapter();
    if (adapter == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    view.setOnPageChangeListener(this);
    notifyDataSetChanged();
}
 

@Override
public void setViewPager(ViewPager view) {
  if( mViewPager == view ) {
    return;
  }
  if( mViewPager != null ) {
    mViewPager.setOnPageChangeListener(null);
  }
  mPagerAdapter = view.getAdapter();

  if( !(mPagerAdapter instanceof ConversationStateProvider) ) {
    throw new IllegalStateException("Adapter has to implement ConversationStateProvider.");
  }

  mStateProvider = (ConversationStateProvider)mPagerAdapter;

  if( mPagerAdapter == null ) {
    throw new IllegalStateException("ViewPager does not have adapter instance.");
  }
  mViewPager = view;
  mViewPager.setOnPageChangeListener(this);
  invalidate();
}
 

@Override
public void setViewPager(ViewPager viewPager) {
    if (mViewPager == viewPager) {
        return;
    }
    if (mViewPager != null) {
        //Clear us from the old pager.
        mViewPager.setOnPageChangeListener(null);
    }
    if (viewPager.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = viewPager;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
}
 

@Override
public void setupWithViewPager(@Nullable ViewPager viewPager) {
    super.setupWithViewPager(viewPager);
    if (viewPager != null) {
        PagerAdapter adapter = viewPager.getAdapter();
        if (adapter != null && adapter instanceof BasePagerAdapterWithIcon) {
            int n = getTabCount();
            titleViews = new CustomTabTitleView[n];
            for (int i = 0; i < n; i++) {
                titleViews[i] = new CustomTabTitleView(getContext());
                titleViews[i].setTitle(adapter.getPageTitle(i).toString());
                titleViews[i].setImageResource(((BasePagerAdapterWithIcon) adapter).getPageIcon(i));
                // noinspection ConstantConditions
                getTabAt(i).setCustomView(titleViews[i]);
            }
        }
    } else {
        titleViews = null;
    }
}
 

@Override
public void setViewPager(ViewPager viewPager) {
    if (mViewPager == viewPager) {
        return;
    }
    if (mViewPager != null) {
        //Clear us from the old pager.
        mViewPager.setOnPageChangeListener(null);
    }
    if (viewPager.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = viewPager;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
    post(new Runnable() {
        @Override public void run() {
            if (mFades) {
                post(mFadeRunnable);
            }
        }
    });
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    if (view.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
}
 

/**
 * Set the {@link ViewPager} associated with this widget indicator.
 *
 * @param pager {@link ViewPager} to attach
 */
@SuppressWarnings("unused")
public void setViewPager(ViewPager pager) {
    if (pager.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    setViewPager(pager, pager.getAdapter().getCount());
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    if (view.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
}
 

/** 关联ViewPager */
public void setViewPager(ViewPager vp) {
    if (vp == null || vp.getAdapter() == null) {
        throw new IllegalStateException("ViewPager or ViewPager adapter can not be NULL !");
    }

    this.mViewPager = vp;

    this.mViewPager.removeOnPageChangeListener(this);
    this.mViewPager.addOnPageChangeListener(this);
    notifyDataSetChanged();
}
 

@Override
public void setViewPager(ViewPager view) {
	if (mViewPager == view) {
		return;
	}
	if (mViewPager != null) {
		mViewPager.setOnPageChangeListener(null);
	}
	if (view.getAdapter() == null) {
		throw new IllegalStateException("ViewPager does not have adapter instance.");
	}
	mViewPager = view;
	mViewPager.setOnPageChangeListener(this);
	invalidate();
}
 

public void setViewPager(ViewPager pager) {
	this.pager = pager;

	if (pager.getAdapter() == null) {
		throw new IllegalStateException("ViewPager does not have adapter instance.");
	}

	pager.setOnPageChangeListener(pageListener);

	notifyDataSetChanged();
}
 

@Override
public void setViewPager(ViewPager view, int initialPosition) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    if(view==null)
    {
        mViewPager = null;
        return;
    }
    if (view.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    mViewPager.setOnPageChangeListener(this);
    //setViewPager(view);
    mIsCycleScroll = mViewPager.getAdapter() != null && mViewPager.getAdapter() instanceof CycleIconPagerAdapter;
    if (mIsCycleScroll) {
        // force snap
        mSnap = true;
        int count = mViewPager.getAdapter().getCount();
        int actualCount = ((CycleIconPagerAdapter) mViewPager.getAdapter()).getActualCount();
        if (actualCount != 0) {
            initialPosition += (count / 2) / actualCount * actualCount;
        } else {
            initialPosition = 0;
        }
    }
    setCurrentItem(initialPosition);
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    if (view.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.setOnPageChangeListener(null);
    }
    if (view.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    mViewPager.setOnPageChangeListener(this);
    invalidate();
}
 

@Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
    super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);

    if (child.getTag() == null) {
        return;
    }

    // try to get the current page, if there's any.
    View view = coordinatorLayout;
    ViewPager viewPager = (ViewPager) coordinatorLayout.findViewById(R.id.viewPager);
    if (viewPager != null && viewPager.getAdapter() instanceof FragmentAdapter) {
        int currentPage = viewPager.getCurrentItem();
        FragmentAdapter pagerAdapter = (FragmentAdapter) viewPager.getAdapter();

        Fragment currentItem = pagerAdapter.getItem(currentPage);

        view = currentItem.getView();
    }

    if (view == null) {
        // We do not have a view we can immediately find.
        child.hide();
        return;
    }

    // Hide if we're over the first item
    RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.list);
    if (recyclerView != null && recyclerView.getLayoutManager() instanceof LinearLayoutManager) {
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        if (layoutManager.findFirstVisibleItemPosition() == 0) {
            child.hide();
        } else if (dyConsumed > 1 && child.getVisibility() == View.VISIBLE)
            child.hide();
        else if (dyConsumed < 1 && child.getVisibility() != View.VISIBLE)
            child.show();
    } else {
        // no recyclerview to attach to?
        child.hide();
    }
}