Android 使用ViewPager實現圖片左右循環滑動自動播放

ViewPager這個小demo實現的是可以左右循環滑動圖片，下面帶索引，滑到最後一頁在往右滑動就要第一頁，第一頁往左滑動就到最後一頁，先上效果圖，用美女圖片是我一貫的作風，呵呵

1. 首先看一些layout下的xml

<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> 

使用ViewPager首先需要引入android-support-v4.jar這個jar包。自己不要忘記加

package com.example.viewpagerdemo; 
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.view.ViewGroup.LayoutParams; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
public class TwoActivity extends Activity implements OnPageChangeListener{ 
/** 
* ViewPager 
*/ 
private ViewPager viewPager; 
/** 
* 裝點點的ImageView數組 
*/ 
private ImageView[] tips; 
/** 
* 裝ImageView數組 
*/ 
private ImageView[] mImageViews; 
/** 
* 圖片資源id 
*/ 
private int[] imgIdArray ; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
ViewGroup group = (ViewGroup)findViewById(R.id.viewGroup); 
viewPager = (ViewPager) findViewById(R.id.viewPager); 
//載入圖片資源ID 
imgIdArray = new int[]{R.drawable.item01, R.drawable.item02, R.drawable.item03, R.drawable.item04, 
R.drawable.item05,R.drawable.item06, R.drawable.item07, R.drawable.item08}; 
//將點點加入到ViewGroup中 
tips = new ImageView[imgIdArray.length]; 
for(int i=0; i<tips.length; i++){ 
ImageView imageView = new ImageView(this); 
imageView.setLayoutParams(new LayoutParams(10,10)); 
tips[i] = imageView; 
if(i == 0){ 
tips[i].setBackgroundResource(R.drawable.page_indicator_focused); 
}else{ 
tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused); 
} 
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, 
LayoutParams.WRAP_CONTENT)); 
layoutParams.leftMargin = 5; 
layoutParams.rightMargin = 5; 
group.addView(imageView, layoutParams); 
} 
//將圖片裝載到數組中 
mImageViews = new ImageView[imgIdArray.length]; 
for(int i=0; i<mImageViews.length; i++){ 
ImageView imageView = new ImageView(this); 
mImageViews[i] = imageView; 
imageView.setBackgroundResource(imgIdArray[i]); 
} 
//設置Adapter 
viewPager.setAdapter(new MyAdapter()); 
//設置監聽，主要是設置點點的背景 
viewPager.setOnPageChangeListener(this); 
//設置ViewPager的默認項, 設置為長度的100倍，這樣子開始就能往左滑動 
viewPager.setCurrentItem((mImageViews.length) * 100); 
} 
/** 
* 
* @author xiaanming 
* 
*/ 
public 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 void destroyItem(View container, int position, Object object) { 
((ViewPager)container).removeView(mImageViews[position % mImageViews.length]); 
} 
/** 
* 載入圖片進去，用當前的position 除以 圖片數組長度取余數是關鍵 
*/ 
@Override 
public Object instantiateItem(View container, int position) { 
((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0); 
return mImageViews[position % mImageViews.length]; 
} 
} 
@Override 
public void onPageScrollStateChanged(int arg0) { 
} 
@Override 
public void onPageScrolled(int arg0, float arg1, int arg2) { 
} 
@Override 
public void onPageSelected(int arg0) { 
setImageBackground(arg0 % mImageViews.length); 
} 
/** 
* 設置選中的tip的背景 
* @param selectItems 
*/ 
private void setImageBackground(int selectItems){ 
for(int i=0; i<tips.length; i++){ 
if(i == selectItems){ 
tips[i].setBackgroundResource(R.drawable.page_indicator_focused); 
}else{ 
tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused); 
} 
} 
} 
} 

上面的代碼中，當只有3張圖片或者2張圖片的時候，滑動存在BUG問題的修改如下

destroyItem(View container, int position, Object object)方法中不removeView

@Override 
public void destroyItem(View container, int position, Object object) { 
// ((ViewPager)container).removeView(mImageViews[position % mImageViews.length]); 
} 
instantiateItem(View container, int position)增加異常撲捉
[java] view plain copy 
@Override 
public Object instantiateItem(View container, int position) { 
try { 
((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0); 
}catch(Exception e){ 
//handler something 
} 
return mImageViews[position % mImageViews.length]; 
} 

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