ViewPager（实现引导页功能）

首先在引导界面的布局文件定义一个ViewPager：

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

再定义几个ImageView来显示不同的图片：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/ll"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:gravity="center_horizontal">

  <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/iv1"
      android:src="@drawable/login_point" />

  <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/iv2"
      android:src="@drawable/login_point" />

  <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/iv3"
      android:src="@drawable/login_point" />

  </LinearLayout>

设置ViewPager的Adapter，继承自PagerAdapter：

  public class MyAdapter extends PagerAdapter {
      private List<View> views;
      private Context context;
      public MyAdapter(List<View> views,Context context){
          this.views=views;
          this.context=context;
      }

  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
      container.removeView(views.get(position));
  }

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
      container.addView(views.get(position));
      return views.get(position);
  }

  @Override
  public int getCount() {
      return views.size();
  }

  @Override
  public boolean isViewFromObject(View view, Object object) {
      return (view==object);
      }
  }

最后在onCreate方法中设置Adapter：

  adapter=new MyAdapter(views,this);
  vp= (ViewPager) findViewById(R.id.vp);
  vp.setAdapter(adapter);

在每个图片下面添加导航点，这就需要调用ViewPager的setOnPageChangeListener(this)方法了。并覆盖onPageSelected(int position)。

  @Override
  public void onPageSelected(int position) {
      for (int i = 0; i < ids.length; i++) {
      //被选中的页面的导航点颜色要更深一些
          if (position == i) {
              dots[i].setImageResource(R.drawable.login_point_selected);
          } else {
              dots[i].setImageResource(R.drawable.login_point);
          }
      }
  }

第一次启动应用是启动欢迎界面，在启动引导界面，最后启动主界面，第二次后就不启动引导界面了，通过Handler来发送消息。

  public static final int time=2000;
  public static final int GOHMOE =1000;
  public static final int GOGUILD =1001;

  private boolean isFistIn=false;

  private Handler mHandler=new Handler(){
      @Override
      public void handleMessage(Message msg) {
          switch (msg.what){
              case GOHMOE:
                  goHome();
                  break;
              case GOGUILD:
                  goGuild();
                  break;
          }
      }
  };
  
  private void goHome(){
  Intent intent=new Intent(WelcomAty.this,MainActivity.class);
  startActivity(intent);
  finish();
  }private void goGuild(){
  Intent intent=new Intent(WelcomAty.this,Guild.class);
  startActivity(intent);
  finish();
  }

  private void init(){
  SharedPreferences preferences= getSharedPreferences("jike",MODE_PRIVATE);
  isFistIn=preferences.getBoolean("isFistIn",true);
  if (!isFistIn){
      mHandler.sendEmptyMessageDelayed(GOHMOE,time);
  }else {

  mHandler.sendEmptyMessageDelayed(GOGUILD,time);
      SharedPreferences.Editor editor=preferences.edit();
      editor.putBoolean("isFistIn",false);
      editor.commit();
      }
  }