导航点在Android里面其实就是一个个图片，在ios里面是PageControl；
需要在xml里面的ViewPager布局里面添加ImageView，使用的时候实现接口：
implements ViewPager.OnPageChangeListener {
在其中的onPageSelected(int position)里面实现图片内容的切换：
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};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide);
initViews();
initDots();
}
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));
vpAdapter = new ViewPagerAdapter(views,this);
vp = (ViewPager)findViewById(R.id.viewPager);
vp.setAdapter(vpAdapter);
vp.addOnPageChangeListener(this);
}
private void initDots(){
dots = new ImageView[views.size()];
for (int i=0;i<views.size();i++){
dots[i] = (ImageView)findViewById(ids[i]);
}
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
for (int i=0;i<views.size();i++){
if (position == i){
dots[i].setImageResource(R.mipmap.ic_launcher);
}else{
dots[i].setImageResource(R.mipmap.ic_launcher_round);
}
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
