Java RecyclerView.smoothScrollToPosition方法代碼示例

import android.support.v7.widget.RecyclerView; //導入方法依賴的package包/類
@Test
public void testOnRecyclerViewScroll_ShouldChangeScrollPosition() throws Exception {
    int scrollPosition = 1;

    RecyclerView recyclerView = (RecyclerView)activity.findViewById(R.id.recyclerView);
    ShadowRecyclerView shadowRecyclerView = (ShadowRecyclerView) ShadowExtractor.extract(recyclerView);

    recyclerView.smoothScrollToPosition(scrollPosition);
    assertEquals(scrollPosition, shadowRecyclerView.getSmoothScrollPosition());
}
 

import android.support.v7.widget.RecyclerView; //導入方法依賴的package包/類
@Test
public void testOnToolbarClicked_RecyclerViewShouldScrollToTop() throws Exception {
    int scrollPosition = 1;
    int topScrollPosition = 0;
    Toolbar toolbar = (Toolbar)activity.findViewById(R.id.toolbar);
    RecyclerView recyclerView = (RecyclerView)activity.findViewById(R.id.recyclerView);
    ShadowRecyclerView shadowRecyclerView = (ShadowRecyclerView) ShadowExtractor.extract(recyclerView);
    recyclerView.smoothScrollToPosition(scrollPosition);

    toolbar.performClick();

    assertEquals(topScrollPosition, shadowRecyclerView.getSmoothScrollPosition());
}
 

import android.support.v7.widget.RecyclerView; //導入方法依賴的package包/類
/**
 * 插入條目
 */
public static void insertItems(SimpleAdapter adapter, RecyclerView view) {
    //loadTimes自增
    loadTimes++;

    try {
        int count = Math.min(MyApplication.books.length(), MyApplication.currentItemIndex + 10);
        for (int i = MyApplication.currentItemIndex; i < count; i++) {
            JSONObject jsonObject = MyApplication.books.getJSONObject(i);
            Book book = new Book();
            book.setBookID(jsonObject.getInt("BookID"));
            book.setPageCount(jsonObject.getInt("PageCount"));
            book.setScore((float) jsonObject.getDouble("Score"));
            book.setTitle(jsonObject.getString("Title"));
            book.setAuthor(jsonObject.getString("Author"));
            book.setCoverUrl(jsonObject.getString("CoverURL"));
            book.setContentUrl(jsonObject.getString("ContentURL"));
            book.setFileName(jsonObject.getString("FileName"));

            MyApplication.currentItemIndex++;

            //將書本信息插入Adapter
            adapter.insert(book, i);
        }

        if (loadTimes == 1)
            view.smoothScrollToPosition(0);

    } catch (JSONException e) {
        e.printStackTrace();
    }
}
 

import android.support.v7.widget.RecyclerView; //導入方法依賴的package包/類
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
	isDialogReady = true;

	// initialize realm object
	realm = Realm.getDefaultInstance();

	// get the arguments passed in
	Bundle bundle = getArguments();
	String id = bundle.getString(MainActivity.TAG_SCHEDULE_ID);
	schedule = realm.where(Schedule.class).equalTo("id", id).findFirst();

	// set up title
	((MainActivity) getActivity()).getSupportActionBar().setTitle(schedule.getLanguage() + " - " + schedule.getTitle());

	// load views
	rootView = inflater.inflate(R.layout.fragment_main, container, false);

	// skip over all days that have already been completed
	findNextIncompleteDay();

	// set up adapter and subscribe to clicks on a day
	int currentDayPosition = schedule.getSchedule().indexOf(currentDay);
	adapter = new ScheduleAdapter(currentDayPosition, schedule.getSchedule(), getContext());
	adapter.asObservable().subscribe(this::showDay);

	// set up recycler view
	RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.scheduleRecyclerView);
	recyclerView.setAdapter(adapter);
	RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 7);
	recyclerView.setLayoutManager(layoutManager);
	recyclerView.smoothScrollToPosition(currentDayPosition);

	return rootView;
}
 

import android.support.v7.widget.RecyclerView; //導入方法依賴的package包/類
@Override
public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    recyclerView.smoothScrollToPosition(position);
}
 

import android.support.v7.widget.RecyclerView; //導入方法依賴的package包/類
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_demo_1);

    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    mToolbar.setTitle(R.string.title);

    setSupportActionBar(mToolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    mRvTag = (RecyclerView) findViewById(R.id.rv_tag);

    mList = new ArrayList<>();

    mAdapter = new TagAdapter(this, mList, new TagAdapter.OnTagClickListener() {
        @Override
        public void onRemoved(String removedTag) {
            Log.i(TAG, "onRemoved: =============removed tag:" + removedTag);
        }

        @Override
        public void onDataSetChange() {
            mRvTag.smoothScrollToPosition(mAdapter.getItemCount() - 1);
        }
    });

    mRvTag.setLayoutManager(new TagLayoutManager.Builder()
            .setBorderLeft(Utils.dp2px(this, 12))
            .setBorderTop(Utils.dp2px(this, 8))
            .setBorderRight(Utils.dp2px(this, 12))
            .setBorderBottom(Utils.dp2px(this, 8))
            .setBorderHor(Utils.dp2px(this, 8))
            .setBorderVer(Utils.dp2px(this, 4))
            .setMaxHeight(Utils.dp2px(this, 100))
            .create());

    mRvTag.setAdapter(mAdapter);

    // avoid adapter call notifyItemChanged then the other item flashing
    ((SimpleItemAnimator)mRvTag.getItemAnimator()).setSupportsChangeAnimations(false);
}