Using ViewPager for Screen Slides 使用屏幕幻灯片ViewPager

  次阅读 来源:互联网(转载协议) 2015-10-02 21:11 我要评论(0)

Screen slides are transitions between one entire screen to another and are common with UIs like setup wizards or slideshows. This lesson shows you how to do screen slides with a ViewPager provided by the support library. ViewPagers can animate screen slides automatically. Here's what a screen slide looks like that transitions from

http://blog.csdn.net/sergeycao

If you want to jump ahead and see a full working example, download and run the sample app and select the Screen Slide example. See the following files for the code implementation:

src/ScreenSlidePageFragment.java

src/ScreenSlideActivity.java

layout/activity_screen_slide.xml

layout/fragment_screen_slide_page.xml

Create the Views

Create a layout file that you'll later use for the content of a fragment. The following example contains a text view to display some text:

<com.example.android.animationsdemo.ScrollView

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

android:id="@+id/content"

android:layout_width="match_parent"

android:layout_height="match_parent">

<TextView style="?android:textAppearanceMedium"

android:padding="16dp"

android:lineSpacingMultiplier="1.2"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="@string/lorem_ipsum" />

</com.example.android.animationsdemo.ScrollView>

Create the Fragment

Create a Fragment class that returns the layout that you just created in the onCreateView() method. You can then create instances of this fragment in the parent activity whenever you need a new page to display to the user:

public class ScreenSlidePageFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

ViewGroup rootView = (ViewGroup) inflater.inflate(

R.layout.fragment_screen_slide_page, container, false);

return rootView;

}

}

Screen Slides with ViewPager

ViewPagers have built-in swipe gestures to transition through pages, and they display screen slide animations by default, so you don't need to create any. ViewPagers use PagerAdapters as a supply for new pages to display, so the PagerAdapter will use the fragment class that you created earlier.

To begin, create a layout that contains a ViewPager:

<android.support.v4.view.ViewPager

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

android:id="@+id/pager"

android:layout_width="match_parent"

android:layout_height="match_parent" />

Create an activity that does the following things:

Sets the content view to be the layout with the ViewPager.

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