Android 利用ViewPager實現圖片可以左右迴圈滑動效果附代碼下載_Android

首先給大家展示靚照，對效果圖感興趣的朋友可以繼續往下閱讀哦。

ViewPager這個小demo實現的是可以左右迴圈滑動圖片，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，上面是效果圖，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]);  }  //設定Adapter  viewPager.setAdapter(new MyAdapter());  //設定監聽，主要是設定點點的背景  viewPager.setOnPageChangeListener(this);  //設定ViewPager的預設項, 設定為長度的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 圖片數組長度取餘數是關鍵  */  @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);  }  /**  * 設定選中的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);  }  }  } } 

喜歡的朋友直接下載代碼哦。代碼下載

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 plaincopy在CODE上查看代碼片派生到My Code片@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];  } 

以上代碼給大家展示了Android 利用ViewPager實現圖片可以左右迴圈滑動效果，希望大家喜歡。