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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.

When to use

This library might be suitable if you have an indeterminate number of views in your viewflow, if instead you have a static numbers of views you ought to look at Fragments and the ViewPager in the Compatibility Library instead.


In your layout


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);

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 calling setAdapter(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 own ViewFlow.ViewSwitchListener and pass it to the setOnViewSwitchListener() method.

viewFlow.setOnViewSwitchListener(new ViewSwitchListener() {
    public void onSwitched(View v, int position) {
        // Your code here

Listen on initialize view events

If you need a lazy View initialization you would want to implement your own ViewFlow.ViewLazyInitializeListener and pass it to the setOnViewLazyInitializeListener() method.

viewFlow.setOnViewLazyInitializeListener(new ViewLazyInitializeListener() {
    public void onViewLazyInitialize(View view, int position) {
        // Your code here e.g.

Flow Indicator

It is also possible to add a flow view indicator to your layout. The purpose of a FlowIndicator is to present a visual representation of where in the item list focus is at. You may either implement a FlowIndicator 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).

    android:padding="10dip" android:layout_height="wrap_content"
    android:layout_width="wrap_content" android:id="@+id/viewflowindic"

And then you'll need to connect your ViewFlow with the FlowIndicator:

CircleFlowIndicator indic = (CircleFlowIndicator) findViewById(R.id.viewflowindic);

By default, the 'active' indicator moves smoothly from one 'inactive' indicator to the next, as the user scrolls. If you set the snap attribute to true, it will instead jump to the next position when the flow settles at the next page.

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, sync (see above).

Title Flow Indicator

This indicator presents the title of the previous, current and next View in the adapter (see screenshot below).

        android:id="@+id/viewflowindic" android:layout_height="wrap_content"
        app:footerTriangleHeight="10dp" app:textColor="#FFFFFFFF" app:selectedColor="#FFFFC445"
        app:footerColor="#FFFFC445" app:titlePadding="10dp" app:textSize="11dp" app:selectedSize="12dp"
        app:clipPadding="5dp" />

And then you'll need to connect your ViewFlow with the FlowIndicator:

    TitleFlowIndicator indicator = (TitleFlowIndicator) findViewById(R.id.viewflowindic);

Building a jar file

If you rather want a jar file instead of a including the project as an android library, run ant jar in the android-viewflow/viewflow folder, to build a jar file.


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 an onConfigurationChanged event to the ViewFlow from your Activity. I know this isn't a very nice solution, feel free to propose better ones!

    public void onConfigurationChanged(Configuration newConfig) {


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.


Copyright (c) 2011 Patrik Åkerfeldt

Licensed under the Apache License, Version 2.0

ViewFlow for Android    ViewFlow for Android

*Note that all licence references and agreements mentioned in the android-viewflow README section above are relevant to that project's source code only.