Android开发模板------ViewPager(一)用PagerAdapter实现图片滑动作为引导页

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iewpager可以做很多事情，从最简单的导航，到页面菜单等等。那如何使用它呢，与ListView类似，我们也需要一个适配器，就是PagerAdapter。
首先看布局文件：

<android.support.v4.view.ViewPager          android:id="@+id/viewpager"          android:layout_width="match_parent"          android:layout_height="match_parent" />

具体业务逻辑如下：

public class GuideViewActivity extends Activity {      private ViewPager vp;      private int[] drawables;      private ImageView[] imageViews;      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_guideview);          vp = (ViewPager) findViewById(R.id.viewpager);          imageData();          vp.setAdapter(new ViewPagerAdapter());          vp.setCurrentItem(0);      }      private void imageData() {          drawables = new int[] { R.drawable.guide_help01,                  R.drawable.guide_help02, R.drawable.guide_help03 };          imageViews = new ImageView[drawables.length];          for (int i = 0; i < drawables.length; i++) {              ImageView img = new ImageView(this);              imageViews[i] = img;              imageViews[i].setBackgroundResource(drawables[i]);          }      }      public class ViewPagerAdapter extends PagerAdapter {          @Override          public int getCount() {              return drawables.length;          }          @Override          public boolean isViewFromObject(View arg0, Object arg1) {              return arg0 == arg1;          }          @Override          public void destroyItem(ViewGroup container, int position, Object object) {              ImageView view = imageViews[position];              ((ViewPager) container).removeView(view);          }          @Override          public Object instantiateItem(View container, int position) {              try {                  if (imageViews[position].getParent() == null) {                      ((ViewPager) container).addView(imageViews[position], 0);                  } else {                      ((ViewGroup) (imageViews[position].getParent()))                              .removeView(imageViews[position]);                  }              } catch (Exception e) {              }              if (position == imageViews.length - 1) {                  imageViews[position].setOnClickListener(new OnClickListener() {                      @Override                      public void onClick(View v) {                          GuideViewActivity.this.finish();                      }                  });              }              return imageViews[position % imageViews.length];          }      }  }

除此之外，ViewPager还有更高级的使用方法，比如定时自动滑动，参考http://blog.csdn.net/dsc114/article/details/46928277 和http://blog.csdn.net/dsc114/article/details/73614567

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