Android ViewPager实现应用…

来源：互联网发布：ios11蜂窝移动网络搜索编辑：程序博客网时间：2024/05/27 00:31

谢谢了。

原文地址：ViewPager实现应用欢迎界面">Android ViewPager实现应用欢迎界面作者：wolverine

IndexSlideActivity：代码

public class IndexSlide extends Activity implementsOnClickListener,
OnPageChangeListener {

private ViewPager vp;
private ViewPagerAdapter vpAdapter;
private List<View>views;

// 引导图片资源
private static final int[] pics = {R.drawable.chun, R.drawable.xia,
R.drawable.qiu,R.drawable.dong };

// 底部小点图片
private ImageView[] dots;

// 记录当前选中位置
private int currentIndex;

@Override
protected void onCreate(BundlesavedInstanceState) {
  // TODO Auto-generated methodstub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.indexslide);

views = newArrayList<View>();

  LinearLayout.LayoutParamsmParams = new LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.WRAP_CONTENT,
    LinearLayout.LayoutParams.WRAP_CONTENT);

  // 初始化引导图片列表
  for (int i = 0; i< pics.length; i++) {
   ImageView iv= new ImageView(this);
   iv.setLayoutParams(mParams);
   iv.setImageResource(pics[i]);
   views.add(iv);
  }
  vp = (ViewPager)findViewById(R.id.page);
  // 初始化Adapter
  vpAdapter = newViewPagerAdapter(views);
  vp.setAdapter(vpAdapter);
  // 绑定回调
  vp.setOnPageChangeListener(this);

// 初始化底部小点
initDots();

}

private void initDots() {
LinearLayout ll =(LinearLayout) findViewById(R.id.ll);

dots = newImageView[pics.length];

  // 循环取得小点图片
  for (int i = 0; i< pics.length; i++) {
   dots[i] =(ImageView) ll.getChildAt(i);
   dots[i].setEnabled(true);//都设为灰色
   dots[i].setOnClickListener(this);
   dots[i].setTag(i);//设置位置tag，方便取出与当前位置对应
  }

currentIndex = 0;
dots[currentIndex].setEnabled(false);//设置为白色，即选中状态
}

private void setCurView(int position) {
  if (position < 0|| position >= pics.length) {
   return;
  }

vp.setCurrentItem(position);
}

private void setCurDot(int positon) {
  if (positon < 0|| positon > pics.length - 1 || currentIndex ==positon) {
   return;
  }

dots[positon].setEnabled(false);
dots[currentIndex].setEnabled(true);

currentIndex =positon;
}

// 当滑动状态改变时调用
public void onPageScrollStateChanged(int arg0){
// TODO Auto-generated methodstub

}

// 当当前页面被滑动时调用
public void onPageScrolled(int arg0, float arg1,int arg2) {
// TODO Auto-generated methodstub

}

// 当新的页面被选中时调用
public void onPageSelected(int arg0) {
setCurDot(arg0);

}

public void onClick(View v) {
  int position = (Integer)v.getTag();
  setCurView(position);
  setCurDot(position);
}

class ViewPagerAdapter extends PagerAdapter{
// 界面列表
privateList<View> views;

  publicViewPagerAdapter(List<View> views){
   this.views =views;
  }

  // 销毁arg1位置的界面
  @Override
  public void destroyItem(Viewarg0, int arg1, Object arg2) {
   ((ViewPager)arg0).removeView(views.get(arg1));

}

  @Override
  public void finishUpdate(Viewarg0) {
   // TODOAuto-generated method stub

}

  // 获得当前界面数
  @Override
  public int getCount() {
   if (views !=null) {
    returnviews.size();
   }

return0;
}

  // 初始化arg1位置的界面
  @Override
  public ObjectinstantiateItem(View arg0, int arg1) {
   ((ViewPager)arg0).addView(views.get(arg1), 0);

returnviews.get(arg1);
}

  // 判断是否由对象生成界面
  @Override
  public booleanisViewFromObject(View arg0, Object arg1) {
   // TODOAuto-generated method stub
   return (arg0== arg1);
  }

  @Override
  public voidrestoreState(Parcelable arg0, ClassLoader arg1) {
   // TODOAuto-generated method stub

}

  @Override
  public Parcelable saveState(){
   // TODOAuto-generated method stub
   returnnull;
  }

  @Override
  public void startUpdate(Viewarg0) {
   // TODOAuto-generated method stub

}

}
布局文件：

<?xml version="1.0"encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

   <android.support.v4.view.ViewPager
       android:id="@+id/page"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent" >
   </android.support.v4.view.ViewPager>
<LinearLayout
       android:id="@+id/ll"
       android:orientation="horizontal"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_marginBottom="24.0dip"
       android:layout_alignParentBottom="true"
       android:layout_centerHorizontal="true">

       <ImageView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_gravity="center_vertical"
           android:clickable="true"
           android:padding="15.0dip"
           android:src="@drawable/dot" />

</LinearLayout>

</RelativeLayout>

设置小圆点的selector：

<?xml version="1.0"encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true"android:drawable="@drawable/off" />
<item android:state_enabled="false"android:drawable="@drawable/on" />

</selector>

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Android&nbsp;ViewPager实现应用…

Android ViewPager实现应用…