Android客户端首次启动引导界面

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" >

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

  <LinearLayout
    android:id="@+id/ll"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="24.0dp"
    android:orientation="horizontal" >

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center_vertical"
      android:clickable="true"
      android:padding="15.0dip"
      android:src="@drawable/dot" />

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center_vertical"
      android:clickable="true"
      android:padding="15.0dip"
      android:src="@drawable/dot" />

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center_vertical"
      android:clickable="true"
      android:padding="15.0dip"
      android:src="@drawable/dot" />

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center_vertical"
      android:clickable="true"
      android:padding="15.0dip"
      android:src="@drawable/dot" />
  </LinearLayout>

</RelativeLayout>

package com.example.yasin.ndklearn;

import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;


import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;

/**
 *
 * @{# GuideActivity.java Create on 2013-5-2 下午10:59:08
 *
 *   class desc: 引导界面
 *
 *   <p>
 *   Copyright: Copyright(c) 2013
 *   </p>
 * @Version 1.0
 * @Author <a href="mailto:gaolei_xj@163.com">Leo</a>
 *
 *
 */
public class GuideActivity extends AppCompatActivity implements OnPageChangeListener {

  private ViewPager vp;
  private ViewPagerAdapter vpAdapter;
  private List<View> views;

  // 底部小点图片
  private ImageView[] dots;

  // 记录当前选中位置
  private int currentIndex;
  Boolean isFirst;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.guide_layout);

    // 初始化页面
    initViews();

    // 初始化底部小点
    initDots();
  }

  private void initViews() {

    SharedPreferences pref = getSharedPreferences("first",Activity.MODE_PRIVATE);
    isFirst = pref.getBoolean("status",true);

    if(!isFirst){
      Intent intent = new Intent(this,MainActivity.class);
      startActivity(intent);
      finish();
    }

    LayoutInflater inflater = LayoutInflater.from(this);
    RelativeLayout guideFour = (RelativeLayout) inflater.inflate(R.layout.guide_four, null);
    guideFour.findViewById(R.id.toMain).setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Intent intent = new Intent(GuideActivity.this,MainActivity.class);
        startActivity(intent);
        finish();
      }
    });
    views = new ArrayList<View>();
    // 初始化引导图片列表
    views.add(inflater.inflate(R.layout.guide_one, null));
    views.add(inflater.inflate(R.layout.guide_two, null));
    views.add(inflater.inflate(R.layout.guide_three, null));
    views.add(guideFour);
    // 初始化Adapter
    vpAdapter = new ViewPagerAdapter(views, this);

    vp = (ViewPager) findViewById(R.id.viewpager);
    vp.setAdapter(vpAdapter);
    // 绑定回调
    vp.setOnPageChangeListener(this);


  }

  private void initDots() {
    LinearLayout ll = (LinearLayout) findViewById(R.id.ll);

    dots = new ImageView[views.size()];

    // 循环取得小点图片
    for (int i = 0; i < views.size(); i++) {
      dots[i] = (ImageView) ll.getChildAt(i);
      dots[i].setEnabled(true);// 都设为灰色
    }

    currentIndex = 0;
    dots[currentIndex].setEnabled(false);// 设置为白色，即选中状态
  }

  private void setCurrentDot(int position) {
    if (position < 0 || position > views.size() - 1
        || currentIndex == position) {
      return;
    }

    dots[position].setEnabled(false);
    dots[currentIndex].setEnabled(true);

    currentIndex = position;
  }

  // 当滑动状态改变时调用
  @Override
  public void onPageScrollStateChanged(int arg0) {
  }

  // 当当前页面被滑动时调用
  @Override
  public void onPageScrolled(int arg0, float arg1, int arg2) {
  }

  // 当新的页面被选中时调用
  @Override
  public void onPageSelected(int arg0) {
    // 设置底部小点选中状态
    setCurrentDot(arg0);
  }

}

package com.example.yasin.ndklearn;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import java.util.List;

/**
 * Created by Yasin on 2016/3/2.
 *
 *
 * @{# ViewPagerAdapter.java Create on 2013-5-2 下午11:03:39
 *
 *   class desc: 引导页面适配器
 *
 *   <p>
 *   Copyright: Copyright(c) 2013
 *   </p>
 * @Version 1.0
 * @Author <a href="mailto:gaolei_xj@163.com">Leo</a>
 *
 *
 */
public class ViewPagerAdapter extends PagerAdapter {

  // 界面列表
  private List<View> views;
  private AppCompatActivity activity;


  public ViewPagerAdapter(List<View> views, AppCompatActivity activity) {
    this.views = views;
    this.activity = activity;
  }
  //加载viewpager的每个item
  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    container.addView(views.get(position),0);
    return views.get(position);
  }
//删除ViewPager的item
  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
    // super.destroyItem(container, position, object);
    container.removeView(views.get(position));
  }

  // 获得当前界面数
  @Override
  public int getCount() {
    if (views != null) {
      return views.size();
    }
    return 0;
  }
//官方推荐这么写，没研究。。。。
  @Override
  public boolean isViewFromObject(View view, Object object) {
    return view == object;
  }


}