简单新闻客户端(5)---其他细节优化，更符合MD设计

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使用cardview使listview的item看起来立体:

详情阅读文章:CardView的使用

listview item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:foreground="?attr/selectableItemBackground">

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center">

<com.android.volley.toolbox.NetworkImageView
android:id="@+id/news_pic"
android:layout_width="100dp"
android:layout_height="100dp"
android:scaleType="fitCenter"
android:src="@mipmap/ic_launcher" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">

<TextView
android:id="@+id/text_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="xxxxxx"
android:textSize="20sp" />

<TextView
android:id="@+id/text_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="xxxxxx"
android:textColor="#cc0000"
android:textSize="15sp" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>

注意这个是用来设置点击阴影的

android:foreground="?attr/selectableItemBackground"

带图片伸缩的ToolBar–CollapsingToolbarLayout+AppBarLayout+CoordinatorLayout

参考文章:Android5.0+(CollapsingToolbarLayout)

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
tools:context=".Activity.MainActivity">

<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="256dp"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">

<ImageView
android:id="@+id/ivImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="@mipmap/ic_launcher"
android:transitionName="新闻图片"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>

<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:fitsSystemWindows="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<WebView
android:id="@+id/web_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"></WebView>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

说明:webview必须使用

NestedScrollView

包裹才能实现效果。

测试:



主activity的toolbar修改:

toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
android:elevation="5dp"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>

main_activity.xml

<android.support.design.widget.CoordinatorLayout
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/appbar"
layout="@layout/toolbar" />

<FrameLayout
android:id="@+id/frame_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/appbar"
android:scrollbars="none"
android:elevation="5dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</android.support.design.widget.CoordinatorLayout>

最关键的一点:

由于使用的是listview没有实现NestedScrollingChild接口

，效果不能实现。

解决办法：1.使用RecyclerView代替listview

2.引入NestedScrollView

3.重写listview 实现NestedScrollingChild接口

参考文章:http://blog.csdn.net/qq_33689414/article/details/51362082

<android.support.v4.widget.NestedScrollView
android:fillViewport="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<ListView
android:id="@+id/listview_news"
android:layout_width="match_parent"
android:layout_height="wrap_content"></ListView>
</android.support.v4.widget.NestedScrollView>

失败出现滑动冲突，listview显示不全。重写去除listview滚动事件。

参考文章:http://blog.csdn.net/mitos_yggdrasill/article/details/51918546

public class NestedListView extends ListView {

public NestedListView(Context context) {
super(context);
}

public NestedListView(Context context, AttributeSet attrs) {
super(context, attrs);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}

使用自定义的listview代替原来的lisview。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">

<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<com.example.administrator.newsbyhuluwo.Activity.NestedListView
android:id="@+id/listview_news"
android:layout_width="match_parent"
android:layout_height="wrap_content">

</com.example.administrator.newsbyhuluwo.Activity.NestedListView>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>

NewsListFragment.java

public class NewsListFragment extends Fragment {

public static List<News> newsList = new ArrayList<>();
private NestedListView listView;
public static NewAdapter newAdapter;

@Override
public void onAttach(Context context) {
super.onAttach(context);
}

@Nullable
@Override
public View onCreateView(final LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_newslist, container, false);
listView = (NestedListView) view.findViewById(R.id.listview_news);
newAdapter = new NewAdapter(getActivity(), R.layout.item_newslist, newsList);
listView.setAdapter(newAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getContext(),
newsList.get(position).getUrl(), Toast.LENGTH_LONG).show();

Context context = getActivity();

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

//用Bundle携带数据
Bundle bundle=new Bundle();
//传递name参数为tinyphp
bundle.putString("uri", newsList.get(position).getUrl());
intent.putExtras(bundle);
context.startActivity(intent);
}
});
return view;
}
}

测试: