现在市面上新闻类的App基本上都有下拉刷新，算是一个标配吧，网上关于下拉刷新的博客也有很多，实现方式可以使用开源的PullToRefresh，自定义ListView，或者可以直接使用LineLayOut直接搞定的。不过Google在今年在support v4 19.1版本的library推出了SwipeRefreshLayout，字面上的意思就是下拉刷新，继承自ViewGroup，而如今google推出了更官方的下拉刷新组件，对于开发者而言无疑是一个好事情，比较少的代码实现需要的功能。
基本布局
先来看下简单的布局,在最外层加上SwipeRefreshLayout，但是子的View需要时可滚动的（ScrollView或ListView）
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<RelativeLayout xmlns:android=
"http://schemas.android.com/apk/res/android"
xmlns:tools=
"http://schemas.android.com/tools"
android:layout_width=
"match_parent"
android:layout_height=
"match_parent"
android:paddingLeft=
"@dimen/activity_horizontal_margin"
android:paddingRight=
"@dimen/activity_horizontal_margin"
android:paddingTop=
"@dimen/activity_vertical_margin"
android:paddingBottom=
"@dimen/activity_vertical_margin"
tools:context=
".MainActivity"
>
<android.support.v4.widget.SwipeRefreshLayout
android:id=
"@+id/swipeRefreshLayout"
android:layout_width=
"wrap_content"
android:layout_height=
"wrap_content"
>
<ListView
android:id=
"@+id/listView"
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
>
</ListView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
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布局效果如下:
Demo实现
MainActivity中onCreate中的初始化一下SwipeLayOut，需要注意的方法是setColorScheme()， 设置进度条的颜色主题，最多能设置四种；
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myListView = (ListView) findViewById(R.id.listView);
mySwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
mySwipeRefreshLayout.setOnRefreshListener(
this
);
mySwipeRefreshLayout.setColorScheme(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
android.R.color.holo_orange_light, android.R.color.holo_red_light);
listAdapter =
new
ArrayAdapter(
this
,android.R.layout.simple_list_item_1,listIDE);
myListView.setAdapter(listAdapter);
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MainActivity中需要实现一下 SwipeRefreshLayout.OnRefreshListener
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@Override
public
void
onRefresh() {
refreshHandler.sendEmptyMessageDelayed(REFRESH_STATUS,
1500
);
}
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最后初始化一下数据setRefreshing(boolean):，显示或隐藏刷新进度条
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private
static
final
int
REFRESH_STATUS =
0
;
private
ListView myListView;
private
SwipeRefreshLayout mySwipeRefreshLayout;
private
ArrayAdapter<String> listAdapter;
private
List<String> listIDE =
new
ArrayList<String>(Arrays.asList(
"Visual Studio"
,
"Android Studio"
,
"Eclipse"
,
"Xcode"
));
private
Handler refreshHandler =
new
Handler()
{
public
void
handleMessage(android.os.Message msg)
{
switch
(msg.what)
{
case
REFRESH_STATUS:
listIDE.removeAll(listIDE);
listIDE.addAll(Arrays.asList(
"C#"
,
"Java"
,
"C++"
,
"Object-C"
));
listAdapter.notifyDataSetChanged();
mySwipeRefreshLayout.setRefreshing(
false
);
break
;
}
};
};
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最后的效果如下:
本文转自Fly_Elephant博客园博客，原文链接：http://www.cnblogs.com/xiaofeixiang/p/4185975.html，如需转载请自行联系原作者
