In front of a high imitation launcher and ink drag effect has been a lot of friends praise, the last article is mainly through the custom ViewGroup, a little trouble. Today, this class uses Viewpager to achieve the same effect, so that the code is less, but the effect is the same. Viewpager is a class that enables smooth switching of about two screens, which is provided by Google.
Using Viewpager first you need to introduce Android-support-v4.jar this jar package. The specific Viewpager usage, here does not introduce, oneself searches from the internet!
Let's look at the effect:
Effects please experience and the previous comparison. The following code:
First of all, the main.xml under layout.
Copy Code code as follows:
<?xmlversion= "1.0" encoding= "Utf-8"?>
<framelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent"
android:orientation= "Vertical" >
<android.support.v4.view.viewpager
Android:id= "@+id/viewpager"
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"/>
<relativelayout
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
android:orientation= "Vertical" >
<linearlayout
Android:id= "@+id/viewgroup"
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
Android:layout_alignparentbottom= "true"
Android:layout_marginbottom= "30DP"
Android:gravity= "Center_horizontal"
android:orientation= "Horizontal" >
</LinearLayout>
</RelativeLayout>
</FrameLayout>
Next, set the layout for each switch interface Item1.xml
Copy Code code as follows:
<?xmlversion= "1.0" encoding= "UTF-8"?>
<linearlayoutxmlns:android= "Http://schemas.android.com/apk/res/android"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent"
android:orientation= "Vertical" >
<imageview
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent"
android:background= "@drawable/guide01" >
</ImageView>
</LinearLayout>
Some of the other interface layouts, like this one, are to modify the background image so that you don't repeat it,
Finally, the core code:
Copy Code code as follows:
Importjava.util.ArrayList;
importandroid.app.Activity;
Importandroid.os.Bundle;
importandroid.os.Parcelable;
Importandroid.support.v4.view.PagerAdapter;
Importandroid.support.v4.view.ViewPager;
Importandroid.support.v4.view.ViewPager.OnPageChangeListener;
Importandroid.view.LayoutInflater;
Importandroid.view.View;
Importandroid.view.ViewGroup;
Importandroid.view.ViewGroup.LayoutParams;
Importandroid.view.Window;
Importandroid.widget.ImageView;
publicclassmainactivityextendsactivity{
Viewpagerviewpager;
arraylist<view>list;
Viewgroupmain,group;
Imageviewimageview;
Imageview[]imageviews;
@Override
Publicvoidoncreate (bundlesavedinstancestate) {
Super.oncreate (savedinstancestate);
This.requestwindowfeature (Window.feature_no_title);
Layoutinflaterinflater=getlayoutinflater ();
List=newarraylist<view> ();
List.add (Inflater.inflate (r.layout.item1,null));
List.add (Inflater.inflate (r.layout.item2,null));
List.add (Inflater.inflate (r.layout.item3,null));
List.add (Inflater.inflate (r.layout.item4,null));
List.add (Inflater.inflate (r.layout.item5,null));
Imageviews=newimageview[list.size ()];
Viewgroupmain= (ViewGroup) inflater.inflate (r.layout.main,null);
Group is the linearlayout of R.layou.main in charge of wrapping small dots.
viewgroupgroup= (ViewGroup) Main.findviewbyid (R.id.viewgroup);
Viewpager= (Viewpager) Main.findviewbyid (R.id.viewpager);
For (Inti=0;i<list.size (); i++) {
Imageview=newimageview (Mainactivity.this);
Imageview.setlayoutparams (Newlayoutparams (10,10));
Imageview.setpadding (10,0,10,0);
Imageviews[i]=imageview;
if (i==0) {
The default entry program after the first picture is selected;
Imageviews[i].setbackgroundresource (R.drawable.guide_dot_white);
}else{
Imageviews[i].setbackgroundresource (R.drawable.guide_dot_black);
}
Group.addview (ImageView);
}
Setcontentview (main);
Viewpager.setadapter (Newmyadapter ());
Viewpager.setonpagechangelistener (Newmylistener ());
}
classmyadapterextendspageradapter{
@Override
Publicintgetcount () {
Returnlist.size ();
}
@Override
Publicbooleanisviewfromobject (VIEWARG0,OBJECTARG1) {
RETURNARG0==ARG1;
}
@Override
Publicintgetitemposition (Objectobject) {
Todoauto-generatedmethodstub
Returnsuper.getitemposition (object);
}
@Override
Publicvoiddestroyitem (VIEWARG0,INTARG1,OBJECTARG2) {
Todoauto-generatedmethodstub
((Viewpager) arg0). Removeview (List.get (arg1));
}
@Override
Publicobjectinstantiateitem (VIEWARG0,INTARG1) {
Todoauto-generatedmethodstub
((Viewpager) arg0). AddView (List.get (arg1));
Returnlist.get (ARG1);
}
@Override
Publicvoidrestorestate (PARCELABLEARG0,CLASSLOADERARG1) {
Todoauto-generatedmethodstub
}
@Override
Publicparcelablesavestate () {
Todoauto-generatedmethodstub
Returnnull;
}
@Override
Publicvoidstartupdate (Viewarg0) {
Todoauto-generatedmethodstub
}
@Override
Publicvoidfinishupdate (Viewarg0) {
Todoauto-generatedmethodstub
}
}
classmylistenerimplementsonpagechangelistener{
@Override
Publicvoidonpagescrollstatechanged (intarg0) {
Todoauto-generatedmethodstub
}
@Override
Publicvoidonpagescrolled (INTARG0,FLOATARG1,INTARG2) {
Todoauto-generatedmethodstub
}
@Override
Publicvoidonpageselected (intarg0) {
for (inti=0;i<imageviews.length;i++) {
IMAGEVIEWS[ARG0]
. Setbackgroundresource (R.drawable.guide_dot_white);
if (arg0!=i) {
Imageviews[i]
. Setbackgroundresource (R.drawable.guide_dot_black);
}
}
}
}
}
Finally, in a reminder, don't forget to join Android-support-v4.jar this jar package.
