在论坛里,经常看到有人问如何实现UC或墨迹天气那样的拖动效果。其实大部分的实现都是参考了Launcher里的Workspace这个类。刚好看到有个开源项目也是实现了这种功能,地址在
http://code.google.com/p/andro-views/,希望对有需要的人有所帮助,做出很cool的应用出来。
View Flow for Android
ViewFlow is an Android UI widget providing a horizontally scrollable ViewGroup with items populated from an Adapter. Scroll down to the bottom of the page for a screen shot.
The component is a Library Project. This means that there's no need to copy-paste resources into your own project, simply add the viewflow component as a reference to any project.
Usage
In your layout
<org.taptwo.android.widget.ViewFlow
android:id="@+id/viewflow"
app:sidebuffer="5"
/>
The use of app:sidebuffer
is optional. It defines the number of Views to buffer on each side of the currently shown View. The default sidebuffer is 3, making up a grand total of 7 (3 * 2 + 1) Views loaded at a time (at max). To be able to use the more convenient app:sidebuffer
attribute, the application namespace must be included in the same manner as the android namespace is. Please refer to the layout main.xml in the example project for a full example. Again, note that it's the application namespace and not the viewflow namespace that must be referred like xmlns:app="http://schemas.android.com/apk/res/your.application.package.here"
.
In your activity
ViewFlow viewFlow = (ViewFlow) findViewById(R.id.viewflow);
viewFlow.setAdapter(myAdapter);
Setting a different initial position (0 being default) is as easy as:
viewFlow.setAdapter(myAdapter, 8);
Although possible, you should not call setSelection(...)
immediately after callingsetAdapter(myAdapter)
as that might load unnecessary views giving you a decrease in performance.
Listen on screen change events
If you need to listen to screen change events you would want to implement your ownViewFlow.ViewSwitchListener
and pass it to the setOnViewSwitchListener()
method.
viewFlow.setOnViewSwitchListener(new ViewSwitchListener() {
public void onSwitched(View v, int position) {
// Your code here
}
});
Flow Indicator
It is also possible to add a flow view indicator to your layout. The purpose of aFlowIndicator
is to present a visual representation of where in the item list focus is at. You may either implement aFlowIndicator
yourself or use an implementation provided by the View Flow library. The View Flow library currently supports the following indicators:
Circle Flow Indicator
This indicator shows a circle for each View
in the adapter with a special circle representing the currently selected view (see screenshot below).
<org.taptwo.android.widget.CircleFlowIndicator
android:padding="10dip" android:layout_height="wrap_content"
android:layout_width="wrap_content" android:id="@+id/viewflowindic"
android:background="#00000000"/>
And then you'll need to connect your ViewFlow
with the FlowIndicator
:
CircleFlowIndicator indic = (CircleFlowIndicator) findViewById(R.id.viewflowindic);
viewFlow.setFlowIndicator(indic);
The following attributes are supported: activeColor
, inactiveColor
,activeType
(either fill or stroke), inactiveType
(either fill or stroke),fadeOut
(time in ms until indicator fades out, 0 = never), radius
.
Title Flow Indicator
This indicator presents the title of the previous, current and next View
in the adapter (see screenshot below).
<org.taptwo.android.widget.TitleFlowIndicator
android:id="@+id/viewflowindic" android:layout_height="wrap_content"
android:layout_width="fill_parent"
app:footerLineHeight="2dp"
app:footerTriangleHeight="10dp" app:textColor="#FFFFFFFF" app:selectedColor="#FFFFC445"
app:footerColor="#FFFFC445" app:titlePadding="10dp" app:textSize="11dp" app:selectedSize="12dp"
android:layout_marginTop="10dip"
app:clipPadding="5dp" />
And then you'll need to connect your ViewFlow
with the FlowIndicator
:
TitleFlowIndicator indicator = (TitleFlowIndicator) findViewById(R.id.viewflowindic);
indicator.setTitleProvider(myTitleProvider);
viewFlow.setFlowIndicator(indicator);
Building a jar file
If you rather want a jar file instead of a including the project as an android library, runant jar
in the android-viewflow/viewflow
folder, to build a jar file.
Caveats
The manifest states a min sdk version of 4, which is true. But in any case you want to support an api level < 8 you will have to forward anonConfigurationChanged
event to the ViewFlow
from your Activity
. I know this isn't a very nice solution, feel free to propose better ones!
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
viewFlow.onConfigurationChanged(newConfig);
}
Contributions
The following persons deserves a mention for their contributions:
Want to contribute?
GitHub has some great articles on how to get started with Git and GitHub and how to fork a project.
Contributers are recommended to fork the app on GitHub (but don't have too). Create a feature branch, push the branch to git hub, press Pull Request and write a simple explanation.
One fix per commit. If let's say a commit closes the open issue 12. Just add closes #12
in your commit message to close that issue automagically.
If you still feel uncomfortable contributing the project github-wise, don't hesistate to send a regular patch.
All code that is contributed must be compliant with Apache License 2.0.
License
Copyright (c) 2011 Patrik Åkerfeldt
Licensed under the Apache License, Version 2.0
/**
* @author 张兴业
* 邮箱:xy-zhang#163.com
* android开发进阶群:278401545
*
*/
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