Android ViewFlipper简单应用

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:id="@+id/guide"
 tools:context="com.example.weijian.homeletterapplication.guideactivity">

  <viewflipper
    android:id="@+id/main_viewflipper"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
  </viewflipper>

</linearlayout>

import android.content.intent;
import android.support.v7.app.actionbar;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.gesturedetector;
import android.view.motionevent;
import android.view.view;
import android.view.windowmanager;
import android.widget.imageview;
import android.widget.viewflipper;

public class guideactivity extends appcompatactivity implements gesturedetector.ongesturelistener {

  private gesturedetector detector;
  private viewflipper flipper;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_guide);
    //隐藏标题栏
    actionbar actionbar = getsupportactionbar();
    actionbar.hide();

    detector = new gesturedetector(this);
    flipper = (viewflipper) this.findviewbyid(r.id.main_viewflipper);
    flipper.addview(addimageview(r.mipmap.guide1));
    flipper.addview(addimageview(r.mipmap.guide2));
    flipper.addview(addimageview(r.mipmap.guide3)); 
  }

  private view addimageview(int id) {
    imageview iv = new imageview(this); 
    //imageview拉伸，充满整个viewflipper
    iv.setscaletype(imageview.scaletype.fit_xy);
    iv.setimageresource(id);
    return iv;
  }

  @override
  public boolean ontouchevent(motionevent event) {
    // todo auto-generated method stub
    return this.detector.ontouchevent(event);
  }

  @override
  public boolean ondown(motionevent e) {
    // todo auto-generated method stub 
    return false;
  }

  @override
  public boolean onfling(motionevent e1, motionevent e2, float velocityx,
              float velocityy) { 
    if (e1.getx() - e2.getx() > 120) {
      this.flipper.shownext();
    }
    if (e1.getx() - e2.getx() < -120) {
      this.flipper.showprevious();
    }
    return false;
  }

  @override
  public void onlongpress(motionevent e) {
    // todo auto-generated method stub
  }

  @override
  public boolean onscroll(motionevent e1, motionevent e2, float distancex,
              float distancey) {
    // todo auto-generated method stub
    return false;
  }

  @override
  public void onshowpress(motionevent e) {
    // todo auto-generated method stub
  }

  @override
  public boolean onsingletapup(motionevent e) {
    // todo auto-generated method stub
    return false;
  }

}