Java Code Examples for android.support.v7.widget.RecyclerView#getItemAnimator()

/**
     * 通过反射替换默认的Item动画 (解决在某些机型上的crash问题)
     */
    private void initItemAnimator() {
        try {
            Field field = RecyclerView.LayoutManager.class.getDeclaredField("mRecyclerView");
            field.setAccessible(true);
            RecyclerView recyclerView = (RecyclerView) field.get(this);
            if (recyclerView != null) {
                recyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
                recyclerView.setHorizontalScrollBarEnabled(false);
                recyclerView.setVerticalScrollBarEnabled(false);
                if (recyclerView.getItemAnimator() != mItemAnimator) {
                    recyclerView.setItemAnimator(mItemAnimator);
                }
            }
//            recyclerView.setItemAnimator(null);
            mRecycler.setViewCacheSize(mCacheCount);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 

/**
 * Initializes the RecyclerView.
 *
 * @param adapter The adapter that provides a binding from an app-specific data set to views
 *                that are displayed within the RecyclerView.
 * @return The RecyclerView itself.
 */
public RecyclerView initializeRecyclerView(Adapter<RecyclerView.ViewHolder> adapter) {
    mAdapter = adapter;
    mAdapter.registerAdapterDataObserver(mAdapterObserver);

    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mRecyclerView.setAdapter(mAdapter);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

    mRecyclerView.setHasFixedSize(true);
    mRecyclerView.addOnScrollListener(new OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            setToolbarShadowVisibility();
        }
    });

    mItemAnimator = mRecyclerView.getItemAnimator();

    return mRecyclerView;
}
 

public long getAnimationDuration(RecyclerView recyclerView, int animationType,
                                 float animateDx, float animateDy) {
    final RecyclerView.ItemAnimator itemAnimator = recyclerView.getItemAnimator();
    if (itemAnimator == null) {
        return animationType == ANIMATION_TYPE_DRAG ? DEFAULT_DRAG_ANIMATION_DURATION
                : DEFAULT_SWIPE_ANIMATION_DURATION;
    } else {
        return animationType == ANIMATION_TYPE_DRAG ? itemAnimator.getMoveDuration()
                : itemAnimator.getRemoveDuration();
    }
}
 

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_expand);
  getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  getSupportActionBar().setTitle(getClass().getSimpleName());

  RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
  LinearLayoutManager layoutManager = new LinearLayoutManager(this);

  // RecyclerView has some built in animations to it, using the DefaultItemAnimator.
  // Specifically when you call notifyItemChanged() it does a fade animation for the changing
  // of the data in the ViewHolder. If you would like to disable this you can use the following:
  RecyclerView.ItemAnimator animator = recyclerView.getItemAnimator();
  if (animator instanceof DefaultItemAnimator) {
    ((DefaultItemAnimator) animator).setSupportsChangeAnimations(false);
  }

  adapter = new GenreAdapter(makeGenres());
  recyclerView.setLayoutManager(layoutManager);
  recyclerView.setAdapter(adapter);

  Button clear = (Button) findViewById(R.id.toggle_button);
  clear.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
      adapter.toggleGroup(makeClassicGenre());
    }
  });
}
 

public static void changeItemAnimation(RecyclerView recyclerView, boolean isOpen) {
    // 关闭viewholder动画效果。解决viewholder闪烁问题
    RecyclerView.ItemAnimator animator = recyclerView.getItemAnimator();
    if (animator instanceof SimpleItemAnimator) {
        ((SimpleItemAnimator) animator).setSupportsChangeAnimations(isOpen);
    }
}
 

public long getAnimationDuration(RecyclerView recyclerView, int animationType, float animateDx, float animateDy) {
    ItemAnimator itemAnimator = recyclerView.getItemAnimator();
    return itemAnimator == null ? animationType == 8 ? 200 : 250 : animationType == 8 ? itemAnimator.getMoveDuration() : itemAnimator.getRemoveDuration();
}