Android ViewPager实现引导页

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使用ViewPager 实现引导页

首先定义一个Acitivyt 加载一个ViewPager控件：

import android.app.Activity;import android.os.Bundle;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.View;import android.widget.ImageView;import java.util.ArrayList;import java.util.List;/** * Created by Administrator on 2015/5/21. */public class Guide extends Activity implements ViewPager.OnPageChangeListener{    private ViewPager vp;    private ViewPagerAdapter vpAdapter;    private List<View> views;    private ImageView dots[];    private int[] ids= {R.id.iv1,R.id.iv2,R.id.iv3,R.id.iv4};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.guide);        initViews();        initDots();    }    private void initDots(){        dots = new ImageView[views.size()];        for(int i=0;i<views.size();i++){            dots[i] = (ImageView) findViewById(ids[i]);        }    }    private void initViews() {        LayoutInflater inflater = LayoutInflater.from(this);        views = new ArrayList<View>();        views.add(inflater.inflate(R.layout.one,null));        views.add(inflater.inflate(R.layout.two,null));        views.add(inflater.inflate(R.layout.three,null));        views.add(inflater.inflate(R.layout.four,null));        vp = (ViewPager) findViewById(R.id.viewpager);        vpAdapter = new ViewPagerAdapter(views,this);        vp.setAdapter(vpAdapter);        vp.setOnPageChangeListener(this);    }    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(int position) {        for (int i=0;i<ids.length;i++){            if(i == position){//选中当前点                dots[i].setImageResource(R.drawable.dark_dot);            }else{                dots[i].setImageResource(R.drawable.white_dot   );            }        }    }    @Override    public void onPageScrollStateChanged(int state) {    }}

同时需要自定义一个Adapter ：

import android.content.Context;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;import java.util.List;/** * Created by Administrator on 2015/5/21. */public class ViewPagerAdapter extends PagerAdapter {    private List<View> views;    private Context context;    public ViewPagerAdapter(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);    }}

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