<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v4.view.ViewPager>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/viewpager"
android:background="#33000000"
android:orientation="vertical"
android:padding="5dip" >
<TextView
android:id="@+id/tv_image_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="第一个引导页面"
android:textColor="@android:color/white"
android:textSize="14sp" />
<LinearLayout
android:id="@+id/ll_points"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dip"
android:layout_gravity="center_horizontal"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
</RelativeLayout>
package com.example.viewpagertest;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnPageChangeListener {
private List<ImageView> imageViewList;
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setView();
initView();
}
public void setView() {
setContentView(R.layout.activity_splash_viewpager);
}
public void initView() {
mViewPager = (ViewPager) findViewById(R.id.viewpager);
prepareData();
ViewPagerAdapter adapter = new ViewPagerAdapter();
mViewPager.setAdapter(adapter);
mViewPager.setOnPageChangeListener(this);
}
private void prepareData() {
imageViewList = new ArrayList<ImageView>();
int[] imageResIDs = getImageResIDs();
ImageView iv;
for (int i = 0; i < imageResIDs.length; i++) {
iv = new ImageView(this);
iv.setBackgroundResource(imageResIDs[i]);
imageViewList.add(iv);
}
}
/**
* 在此处本来是5张图片,现在在数组首尾各加了一张图
* @return
*/
private int[] getImageResIDs() {
return new int[]{
R.drawable.pic_02,
R.drawable.bg1,
R.drawable.bg2,
R.drawable.bg3,
R.drawable.pic_01,
R.drawable.pic_02,
R.drawable.bg1,
};
}
class ViewPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return imageViewList.size();
}
/**
* 判断出去的view是否等于进来的view 如果为true直接复用
*/
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
/**
* 销毁预加载以外的view对象, 会把需要销毁的对象的索引位置传进来就是position
*/
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(imageViewList.get(position));
}
/**
* 创建一个view
*/
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(imageViewList.get(position));
return imageViewList.get(position);
}
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int position) {
if ( imageViewList.size() > 1) { //多于1,才会循环跳转
if ( position < 1) { //首位之前,跳转到末尾(N)
position = 5;
mViewPager.setCurrentItem(position,false);
} else if ( position > 5) { //末位之后,跳转到首位(1)
mViewPager.setCurrentItem(1,false); //false:不显示跳转过程的动画
position = 1;
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
mViewPager.setCurrentItem(1,false); //false:不显示跳转过程的动画
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