使用ViewPager实现高仿launcher左右拖动效果

 
效果请自行体验和上一篇比较。下面上代码：
首先是layout下面的main.xml
代码如下：

?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

接下来为每一个切换界面设置布局item1.xml
代码如下：

?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

其他的几个界面布局和这个一样，就是修改下背景图片，所以不再复述，
最后是核心代码：
代码如下：

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;
ArrayListViewlist;
ViewGroupmain,group;
ImageViewimageView;
ImageView[]imageViews;
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
LayoutInflaterinflater=getLayoutInflater();
list=newArrayListView();
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是R.layou.main中的负责包裹小圆点的LinearLayout.
ViewGroupgroup=(ViewGroup)main.findViewById(R.id.viewGroup);
viewPager=(ViewPager)main.findViewById(R.id.viewPager);
for(inti=0;ilist.size();i++){
imageView=newImageView(MainActivity.this);
imageView.setLayoutParams(newLayoutParams(10,10));
imageView.setPadding(10,0,10,0);
imageViews[i]=imageView;
if(i==0){
//默认进入程序后第一张图片被选中;
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;iimageViews.length;i++){
imageViews[arg0]
.setBackgroundResource(R.drawable.guide_dot_white);
if(arg0!=i){
imageViews[i]
.setBackgroundResource(R.drawable.guide_dot_black);
}
}
}
}
}

最后在提醒一句，不要忘记加入android-support-v4.jar这个jar包。