Android引导页面的简单实现

第一次进入应用的时候，都会有一个引导页面，引导页面的实现起来也很简单，实现的方式也有很多，下面是自己写的一个引导页面的效果，大致的实现思路为:

最外层是一个FragmentActivity，里面包含4个fragment，在fragment中给ViewPager开一个循环，这样实现了图片播，其实效果就是在FragmentActivity中几个fragment滑动切换，
fragment中ViewPager无限轮播和滑动切换；

下面为代码实现:

public class MainActivity extends ActionBarActivity {
 private ViewPager viewpager;
 private FragmentManager fm;
 private ViewPagerAdapter adapter;
 private ArrayList<Object> items = new ArrayList<Object>();
 private Button btn_guide;
 private View point1, point2, point3, point4;
 private int choiceBg = R.drawable.shape_bule_point;// 被选背景
 private int unChoiceBg = R.drawable.shape_center_point_red;// 未被选背景
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.activity_main);
  initView();
 }
 private void initView() {
  btn_guide = (Button) findViewById(R.id.btn_guide);
  point1 = findViewById(R.id.point1);
  point2 = findViewById(R.id.point2);
  point3 = findViewById(R.id.point3);
  point4 = findViewById(R.id.point4);
  viewpager = (ViewPager) findViewById(R.id.viewpager);
  fm = this.getSupportFragmentManager();
  items.add(new FirstFragment());
  items.add(new SecondFragment());
  items.add(new ThridFragment());
  items.add(new FourFragment());
  adapter = new ViewPagerAdapter(fm, items);
  viewpager.setAdapter(adapter);
  viewpager.setCurrentItem(0, false);
  viewpager.setOffscreenPageLimit(items.size());
  // 被选设置为蓝色
  point1.setBackgroundResource(choiceBg);
  viewpager.setOnPageChangeListener(new GuidePageListener());
 }
 
 class GuidePageListener implements OnPageChangeListener {
  // 滑动事件
  @Override
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  }
  // 某个页面被选中
  @Override
  public void onPageSelected(int position) {
   if (position == 0) {
    setPointBg(choiceBg, unChoiceBg, unChoiceBg, unChoiceBg);
   } else if (position == 1) {
    setPointBg(unChoiceBg, choiceBg, unChoiceBg, unChoiceBg);
   } else if (position == 2) {
    setPointBg(unChoiceBg, unChoiceBg, choiceBg, unChoiceBg);
   } else {
    setPointBg(unChoiceBg, unChoiceBg, unChoiceBg, choiceBg);
   }
   if (position == items.size() - 1) {// 最后一个页面
    btn_guide.setVisibility(View.VISIBLE);// 显示开始体验的按钮
   } else {
    btn_guide.setVisibility(View.INVISIBLE);
   }
  }
  // 滑动状态发生变化
  @Override
  public void onPageScrollStateChanged(int state) {
  }
 }
 
 private void setPointBg(int pointBg1, int pointBg2, int pointBg3, int pointBg4) {
  point1.setBackgroundResource(pointBg1);
  point2.setBackgroundResource(pointBg2);
  point3.setBackgroundResource(pointBg3);
  point4.setBackgroundResource(pointBg4);
 }
}

在这里要注意ViewPager和fragment在滑动变化时，改变底部小圆点被选的颜色；

public class HomeAdapter extends PagerAdapter {
 private List<GuiderInfo> data;
 private ImageCycleViewListener mImageCycleViewListener;
 private Context context;
 public HomeAdapter(Context context, List<GuiderInfo> data, ImageCycleViewListener mImageCycleViewListener) {
  this.context = context;
  this.mImageCycleViewListener = mImageCycleViewListener;
  this.data = new ArrayList<GuiderInfo>();
  if (data != null) {
   this.data.addAll(data);
  }
 }
 public void notifyData(List<GuiderInfo> data) {
  if (data != null) {
   this.data.clear();
   this.data.addAll(data);
  }
  notifyDataSetChanged();
 }
 // 当天viewpager有多少个条目
 LinkedList<ImageView> imageList = new LinkedList<ImageView>();
 @Override
 public int getCount() {
  if (data.size() != 0) {
   return Integer.MAX_VALUE;// 无限循环
  } else {
   return 0;
  }
 }
 // 判断返回的对象和加载view对象关系
 @Override
 public boolean isViewFromObject(View arg0, Object arg1) {
  return arg0 == arg1;
 }
 // 销毁一个条目
 @Override
 public void destroyItem(ViewGroup container, int position, Object object) {
  // super.destroyItem(container, position, object);
  ImageView view = (ImageView) object;
  imageList.add(view);// 把移除的对象添加到缓存集合中
  container.removeView(view);
 }
 // 创建一个条目
 @Override
 public Object instantiateItem(ViewGroup container, int position) {
  int index = 0;
  if (data.size() != 0) {
   index = position % data.size();
  }
  final ImageView image;
  if (imageList.size() > 0) {
   image = imageList.remove(0);
  } else {
   image = new ImageView(context);
  }
//  BitmapUtils bitmapUtils = BitMapHelper.getBitmapUtils();
  final GuiderInfo vo = data.get(index);
  if (vo != null) {
//   String url = vo.url;
//   bitmapUtils.display(image, url, new BitmapLoadCallBack<View>() {
//
//    @SuppressWarnings("deprecation")
//    @Override
//    public void onLoadCompleted(View arg0, String arg1, Bitmap bitmap, BitmapDisplayConfig arg3, BitmapLoadFrom arg4) {
//     image.setImageBitmap(null);
//     BitmapDrawable ob = new BitmapDrawable(context.getResources(), bitmap);
//     image.setBackgroundDrawable(ob);
//    }
//
//    @Override
//    public void onLoadFailed(View arg0, String arg1, Drawable arg2) {
//     // TODO Auto-generated method stub
//
//    }
//   });
   int imageid = vo.imageid;
   image.setImageResource(imageid);
//   bitmapUtils.display(image, url);
  }
  final int pos = index;
  if (mImageCycleViewListener != null) {
   image.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
     mImageCycleViewListener.onImageClick(vo, pos, image);
    }
   });
  }
  container.addView(image);// 加载的view对象
  return image;// 返回的对象
 }
 
 public static interface ImageCycleViewListener {
  
  public void onImageClick(GuiderInfo info, int postion, View imageView);
 }
}

public class FirstFragment extends Fragment implements ImageCycleViewListener {
 private View view;
 private ViewPager header_view;
 private HomeAdapter adapter;
 private List<GuiderInfo> data = new ArrayList<GuiderInfo>();
 private boolean flag;
 private TextView tv_dis;
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  view = inflater.inflate(R.layout.first_fragment, container, false);
  setData();
  initView();
  return view;
 }
 @SuppressWarnings("deprecation")
 private void initView() {
  tv_dis = (TextView) view.findViewById(R.id.tv_dis);
  header_view = (ViewPager) view.findViewById(R.id.header_view);
  adapter = new HomeAdapter(getActivity(), data, this);
  header_view.setAdapter(adapter);
  header_view.setOnPageChangeListener(new OnPageChangeListener() {
   @Override
   public void onPageSelected(int arg0) {
    //计算当前选中的图片index
    int index = arg0 % 2;
    System.out.println("-----------index" + index);
    GuiderInfo dtGzsApplyCenterHeader = data.get(index);
    tv_dis.setText(""+dtGzsApplyCenterHeader.event_content);
   }
   @Override
   public void onPageScrolled(int arg0, float arg1, int arg2) {
   }
   @Override
   public void onPageScrollStateChanged(int arg0) {
   }
  });
  // 设置中间值
  final AuToRunTask run = new AuToRunTask();
  header_view.setCurrentItem(1000 * data.size());// 实现左右两边都可以滑动
  header_view.setOnTouchListener(new OnTouchListener() {
   @Override
   public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:// 按下
     run.stop();
     break;
    case MotionEvent.ACTION_CANCEL:// 事件取消
    case MotionEvent.ACTION_UP:// 抬起
     run.start();
     break;
    default:
     break;
    }
    return false;// viewpager触摸事件返回值要是fasle不能为true
   }
  });
  run.start();// 开启轮播
 }
 @Override
 public void onImageClick(GuiderInfo info, int postion, View imageView) {
 }
 // 自动轮播
 class AuToRunTask implements Runnable {
  @Override
  public void run() {
   if (flag) {
    // 取消之前的任务
    DensityUtil.cancle(this);
    // 获取当前条目
    int currentItem = header_view.getCurrentItem();
    currentItem++;
    header_view.setCurrentItem(currentItem);
    // 延迟执行当前的一个任务
    DensityUtil.postDelayed(this, 2000);// 递归调用
   }
  }
  public void start() {
   if (!flag) {
    // 取消之前的任务
    DensityUtil.cancle(this);
    flag = true;
    // 延迟执行当前的一个任务
    DensityUtil.postDelayed(this, 1000);// 递归调用
   }
  }
  public void stop() {
   if (flag) {
    flag = false;
    DensityUtil.cancle(this);
   }
  }
 }
 private void setData() {
  GuiderInfo vo = new GuiderInfo();
  vo.imageid = R.drawable.shape_red;
  vo.event_content="红色";
  data.add(vo);
  GuiderInfo vo1 = new GuiderInfo();
  vo1.imageid = R.drawable.shape_yellow;
  vo1.event_content="黄色";
  data.add(vo1);
 }
}

以上为效果实现的主要代码，效果运行如下:

上面的效果图还有一小部分效果未展示出来，其实上面的圆是循环轮播的，同时也是可以滑动的；

源码：Androidpager

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