我模仿別人的知乎日報，新聞列表頁沒問題，內容明細頁(NewsDetail)用的是ViewPager+Fragment?？梢宰笥一瑒涌醋笥业男侣劦摹?/p>

我的項目地址是鏈接描述

但是我在做頂部可折疊式標題欄的時候有個問題，從新聞列表中點擊新聞進去的新聞頁面的Toolbar是不對的，但是比如說往右邊滑一個就是正常的，再右邊滑一個也正常，然后左滑動兩次回到第一次打開的新聞頁面，Toolbar就正常了。。很奇怪，模擬器7.1.1和真機Nexus6(7.0)上都是一樣的問題。

圖片的順序是點擊第一個新聞后----上滑到出現Toolbar----右滑到第二個新聞，上滑到Toolbar，正常

那個Toolbar又正常了。(如果Toolbar不正常，那返回按鈕和分享按鈕就按不了，如果正常，則這兩個按鈕可以按),我是這樣想的，右滑頁面能出現正常顯示，包括Toolbar能正常，說明布局文件沒問題。

2.

3.activity_news_detail.xml

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:id="@+id/activity_news_detail_view_pager"

android:layout_height="match_parent"

tools:context="com.lance.lancezhihudaily.ui.activity.NewsDetailActivity">

fragment_news_detail.xml

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:fitsSystemWindows="ture">

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:fitsSystemWindows="true">

android:id="@+id/collapsing_toolbar_layout"

android:layout_width="match_parent"

android:layout_height="256dp"

android:fitsSystemWindows="true"

android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"

app:contentScrim="@color/colorPrimary"

app:expandedTitleMarginEnd="96dp"

app:expandedTitleTextAppearance="@style/CollapsingToolbarTitleStyle"

app:layout_scrollFlags="scroll|exitUntilCollapsed">

android:layout_width="match_parent"

android:layout_height="match_parent"

android:fitsSystemWindows="true"

app:layout_collapseMode="parallax"

app:layout_collapseParallaxMultiplier="0.8"

app:layout_scrollFlags="scroll|snap|enterAlways|enterAlwaysCollapsed">

android:id="@+id/image_view_header"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:contentDescription="@null"

android:scaleType="centerCrop"/>

android:id="@+id/text_view_title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_gravity="bottom"

android:layout_marginBottom="16dp"

android:padding="16dp"

android:textColor="@android:color/white"

android:textSize="22sp"

tools:text="@string/news_detail_text_title"/>

android:id="@+id/text_view_source"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="end|bottom"

android:padding="8dp"

android:textColor="#A1FFFFFF"

android:textSize="13sp"

tools:text="@string/news_detail_text_source"/>

android:id="@+id/news_detail_toolbar"

android:layout_width="match_parent"

android:layout_height="?attr/actionBarSize"

android:minHeight="?attr/actionBarSize"

app:layout_collapseMode="pin"/>

android:id="@+id/nestedScrollView"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:scrollbars="vertical"

app:layout_behavior="@string/appbar_scrolling_view_behavior">

android:id="@+id/web_view"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:isScrollContainer="false"

android:scrollbars="vertical"/>

android:id="@+id/floatingActionButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="16dp"

android:src="@drawable/fav_normal"

android:theme="@style/MyFloatingButton"

app:layout_anchor="@id/nestedScrollView"

app:layout_anchorGravity="bottom|end"/>

NewsDetailActivity.java

public class NewsDetailActivity extends AppCompatActivity {

public static final String EXTRA_NEWS = "com.lance.lancezhihudaily.mNews";

public static final String EXTRA_NEWS_LIST = "com.lance.lancezhihudaily.news_list";

private ViewPager mViewPager;

private News mNews;

private List mNewsList;

public static void start(Context context, News news, List newsList) {

Intent intent = new Intent(context, NewsDetailActivity.class);

intent.putExtra(EXTRA_NEWS, news);

intent.putExtra(EXTRA_NEWS_LIST, (Serializable) newsList);

context.startActivity(intent);

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_news_detail_pager);

mViewPager = (ViewPager) findViewById(R.id.activity_news_detail_view_pager);

mNews = (News) getIntent().getSerializableExtra(EXTRA_NEWS);

mNewsList = (List) getIntent().getSerializableExtra(EXTRA_NEWS_LIST);

FragmentManager fragmentManager = getSupportFragmentManager();

FragmentStatePagerAdapter fragmentStatePagerAdapter = new FragmentStatePagerAdapter(fragmentManager) {

@Override

public Fragment getItem(int position) {

News news = mNewsList.get(position);

return NewsDetailFragment.newInstance(news);

}

@Override

public int getCount() {

return mNewsList.size();

}

};

mViewPager.setAdapter(fragmentStatePagerAdapter);

setCurrentItem();

}

private void setCurrentItem() {

for (int i = 0; i < mNewsList.size(); i++) {

if (mNewsList.get(i).getId() == (mNews.getId())) {

mViewPager.setCurrentItem(i);

break;

}

}

}

}

NewsDetailFragment.java

public class NewsDetailFragment extends Fragment implements View.OnClickListener {

private static final String ARG_NEWS = "mNews";

private CollapsingToolbarLayout mCollapsingToolbarLayout;

private ImageView mImageViewHeader;

private TextView mTextViewTitle;

private TextView mTextViewSource;

private Toolbar mToolbarNewsDetail;

private FloatingActionButton mFloatingFavorite;

private WebView mWebView;

public News mNews;

public NewsDetail mNewsDetail;

private DBDao mDBDao;

private boolean isFavorite = false;

public static NewsDetailFragment newInstance(News news) {

Bundle args = new Bundle();

args.putSerializable(ARG_NEWS, news);

NewsDetailFragment newsDetailFragment = new NewsDetailFragment();

newsDetailFragment.setArguments(args);

return newsDetailFragment;

}

@Override

public void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setHasOptionsMenu(true);

mNews = (News) getArguments().getSerializable(ARG_NEWS);

mDBDao = new DBDao(getActivity());

}

@Nullable

@Override

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_news_detail, container, false);

mCollapsingToolbarLayout = (CollapsingToolbarLayout) view.findViewById(R.id.collapsing_toolbar_layout);

mImageViewHeader = (ImageView) view.findViewById(R.id.image_view_header);

mTextViewTitle = (TextView) view.findViewById(R.id.text_view_title);

mTextViewSource = (TextView) view.findViewById(R.id.text_view_source);

mToolbarNewsDetail = (Toolbar) view.findViewById(R.id.news_detail_toolbar);

mFloatingFavorite = (FloatingActionButton) view.findViewById(R.id.floatingActionButton);

mWebView = (WebView) view.findViewById(R.id.web_view);

isFavorite = mDBDao.isFavorite(mNews);

if (isFavorite) {

mFloatingFavorite.setImageResource(R.drawable.fav_active);

} else {

mFloatingFavorite.setImageResource(R.drawable.fav_normal);

}

return view;

}

@Override

public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

super.onViewCreated(view, savedInstanceState);

initCollapsingToolBar();

initDetail();

}

//初始化界面

private void initDetail() {

if (NetworkCheck.checkNetWorkConnection(MyApp.getContext())) {

RetrofitManager.builder()

.getNewsDetail(mNews.getId())

.subscribeOn(Schedulers.io())

.observeOn(AndroidSchedulers.mainThread())

.subscribe(new Consumer() {

@Override

public void accept(@NonNull NewsDetail newsDetail) throws Exception {

mNewsDetail = newsDetail;

loadNewsDetailData();

}

});

} else {

NetworkCheck.noNetworkAlert(getContext());

}

}

//設置WebView

private void setWebView(WebView webView) {

webView.getSettings().setJavaScriptEnabled(true);

webView.setVerticalScrollBarEnabled(false);

webView.setHorizontalScrollBarEnabled(false);

}

//折疊標題欄的加載

private void initCollapsingToolBar() {

AppCompatActivity activity = (AppCompatActivity) getActivity();

activity.setSupportActionBar(mToolbarNewsDetail);

ActionBar actionBar = activity.getSupportActionBar();

if (actionBar != null) {

actionBar.setDisplayHomeAsUpEnabled(true);

}

mCollapsingToolbarLayout.setTitleEnabled(true);

}

//加載newsDetail數據的方法

public void loadNewsDetailData() {

Glide.with(getContext())

.load(mNewsDetail.getImage())

.into(mImageViewHeader);

mTextViewTitle.setText(mNewsDetail.getTitle());

mTextViewSource.setText(mNewsDetail.getImage_source());

mWebView.setDrawingCacheEnabled(true);

String htmlData = HtmlUtil.createHtmlData(mNewsDetail);

mWebView.loadData(htmlData, HtmlUtil.MIME_TYPE, HtmlUtil.ENCODING);

setWebView(mWebView);

//設置FloatingButton的點擊監聽器

mFloatingFavorite.setOnClickListener(this);

}

//FloatingButton的點擊后實現的邏輯

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.floatingActionButton:

if (isFavorite) {

mDBDao.deleteFavorite(mNews);

mFloatingFavorite.setImageResource(R.drawable.fav_normal);

isFavorite = false;

} else {

mDBDao.insertFavorite(mNews);

mFloatingFavorite.setImageResource(R.drawable.fav_active);

isFavorite = true;

}

break;

default:

break;

}

}

//

@Override

public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

menu.clear();

inflater.inflate(R.menu.news_detail_toolbar,menu);

}

//actionbar的點擊

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case android.R.id.home:

getActivity().onBackPressed();

return true;

case R.id.action_bar_share:

share();

return true;

}

return super.onOptionsItemSelected(item);

}

//分享功能

private void share() {

Intent intent = new Intent(Intent.ACTION_SEND);

intent.setType("text/plain");

intent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.share));

intent.putExtra(Intent.EXTRA_TEXT, getString(R.string.share_from) + mNews.getTitle() + "，http://daily.zhihu.com/story/" + mNews.getId());

startActivity(Intent.createChooser(intent, mNews.getTitle()));

}

}

總結

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