安卓之使用ViewPager實作左右循環滑動

轉載至: http://blog.csdn.net/wangkuifeng0118/article/details/7506324

 前面一篇文章實作了使用ViewPager實作高仿launcher拖動效果 ，後來很多朋友問能不能實作左右循環滑動效果和引導頁面。今天實作了左右滑動，至于在最後一頁滑動跳轉，這個也做了但是效果不是太好，也希望有實作的朋友能夠分享下。在最後一頁添加一張圖檔單擊跳轉，這個認為很簡單大家自己添加個圖檔，點選後跳轉就OK。

           這篇是在實作了使用ViewPager實作高仿launcher拖動效果的基礎上做了一些小的修改，可以參照前面的。廢話不多說了，直接上代碼吧！

          首先看一些layout下的xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns: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>      

和前面一頁使用viewpager。使用ViewPager首先需要引入android-support-v4.jar這個jar包。自己不要忘記加。

  下面是核心代碼：

package cn.com.karl.viewpager;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.ImageView;
public class MainActivity extends Activity {
ViewPager viewPager;
ArrayList<View> list;
ViewGroup main, group;
ImageView p_w_picpathView;
ImageView[] p_w_picpathViews;
private static int c_id = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
LayoutInflater inflater = getLayoutInflater();
list = new ArrayList<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));
p_w_picpathViews = new ImageView[list.size()];
ViewGroup main = (ViewGroup) inflater.inflate(R.layout.main, null);
ViewGroup group = (ViewGroup) main.findViewById(R.id.viewGroup);
viewPager = (ViewPager) main.findViewById(R.id.viewPager);
for (int i = 0; i < list.size(); i++) {
p_w_picpathView = new ImageView(MainActivity.this);
p_w_picpathView.setLayoutParams(new LayoutParams(12,12));
//p_w_picpathView.setPadding(10, 0, 10, 0);
p_w_picpathViews[i] = p_w_picpathView;
if (i == 0) {
p_w_picpathViews[i].setBackgroundResource(R.drawable.guide_dot_white);
} else {
p_w_picpathViews[i].setBackgroundResource(R.drawable.guide_dot_black);
}
group.addView(p_w_picpathView);
}
setContentView(main);
viewPager.setAdapter(new MyAdapter());
viewPager.setOnPageChangeListener(new MyListener());
viewPager.setCurrentItem(300);
}
class MyAdapter extends PagerAdapter {
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public int getItemPosition(Object object) {
// TODO Auto-generated method stub
return super.getItemPosition(object);
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
// TODO Auto-generated method stub
//((ViewPager) arg0).removeView(list.get(arg1));
}
@Override
public Object instantiateItem(View arg0, int arg1) {
// TODO Auto-generated method stub
try{
((ViewPager) arg0).addView(list.get(arg1%list.size()),0);
}catch (Exception e) {
// TODO: handle exception
}
return list.get(arg1%list.size());
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
// TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
}
class MyListener implements OnPageChangeListener {
//當滑動狀态改變時調用
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
//arg0=arg0%list.size();
}
//當目前頁面被滑動時調用
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
//當新的頁面被選中時調用
@Override
public void onPageSelected(int arg0) {
if(arg0>2){
arg0=arg0%list.size();
}
c_id = arg0;
for (int i = 0; i < p_w_picpathViews.length; i++) {
p_w_picpathViews[arg0]
.setBackgroundResource(R.drawable.guide_dot_white);
if (arg0 != i) {
p_w_picpathViews[i]
.setBackgroundResource(R.drawable.guide_dot_black);
}
}
Log.e("-------------", "目前是第"+c_id+"頁");
}
}
}