直接上代码！！
先看布局文件吧，很简单的一个布局。。这里为什么用一个空的线性布局呢，想不通的可以先往后看
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<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_gravity="bottom|center_horizontal"
android:layout_marginBottom="50dp"
android:orientation="horizontal" >
</LinearLayout>
</FrameLayout>
java代码
package com.example.guidedemo;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
public class MainActivity extends Activity {
private ViewPager mViewPager;
private GuidePagerAdapter mAdapter;
private LinearLayout ll;
private ImageView[] images;
private int[] icons = { R.drawable.bg_guide1, R.drawable.bg_guide2,
R.drawable.bg_guide3 };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.viewPager);
ll = (LinearLayout) findViewById(R.id.ll);
mAdapter = new GuidePagerAdapter();
mViewPager.setAdapter(mAdapter);
mViewPager.setOnPageChangeListener(pagerListener);
initDot();
}
/**
* 初始化小圆点的方法
*/
private void initDot() {
images = new ImageView[icons.length];// 小圆点具体有多少个，就看有多少张图片
for (int i = 0; i < icons.length; i++) {
ImageView iv = new ImageView(this);
LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
lp.weight = 1;// 让他们权重都为1，注意这里是LinearLayout.LayoutParams.
lp.setMargins(10, 0, 0, 0);
iv.setLayoutParams(lp);
if (i == 0) {// 这里默认让第一个圆点是红色，因为是第一页嘛
iv.setImageResource(R.drawable.icon_red);
} else {// 其他为灰色
iv.setImageResource(R.drawable.icon_gray);
}
images[i] = iv;// 把创建出来的ImageView放到这个数组里面
ll.addView(images[i]);// 添加到刚写的那个空的线性布局中去
}
}
/**
* ViewPager的滑动监听方法
*/
private OnPageChangeListener pagerListener = new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
for (int i = 0; i < images.length; i++) {
if(i == arg0){
images[i].setImageResource(R.drawable.icon_red);
}else{
images[i].setImageResource(R.drawable.icon_gray);
}
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
};
public class GuidePagerAdapter extends PagerAdapter {
/**
* viewPgaer有多少页
*/
@Override
public int getCount() {
return icons.length;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
/**
* View视图长什么样，全靠这个方法啦
*/
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView iv = new ImageView(MainActivity.this);// 代码动态的创建一个ImageView
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
iv.setLayoutParams(lp);
// 这里最好用BackgroundResource，因为ImageResource相当于XML里面定义的src
iv.setBackgroundResource(icons[position]);
container.addView(iv);// 切记一定要把当前View对象添加到ViewGroup中，不然就什么都看不到
return iv;
}
/**
* 移除View视图
*/
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
}
看完了是不是觉得很简单