<?xml version="1.0" encoding="UTF-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true" android:drawable="@drawable/dark_dot" />
<item android:state_enabled="false" android:drawable="@drawable/white_dot" />
</selector>
</div>
3、 java文件
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.os.Parcelable;
importandroid.support.v4.view.PagerAdapter;
importandroid.support.v4.view.ViewPager;
importandroid.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
importandroid.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class WelcomeActivity extends Activity implementsOnClickListener, OnPageChangeListener{
private ViewPager vp;
private ViewPagerAdapter vpAdapter;
private List<View> views;
//引導圖片資源
private static final int[] pics = { R.drawable.whatsnew_00,
R.drawable.whatsnew_01, R.drawable.whatsnew_02,
R.drawable.whatsnew_03 };
//底部小店圖片
private ImageView[] dots ;
//記錄當前選中位置
private int currentIndex;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
views = new ArrayList<View>();
LinearLayout.LayoutParams mParams =newLinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
//初始化引導圖片列表
for(int i=0; i<pics.length; i++) {
ImageView iv = new ImageView(this);
iv.setLayoutParams(mParams);
iv.setImageResource(pics[i]);
views.add(iv);
}
vp = (ViewPager) findViewById(R.id.viewpager);
//初始化Adapter
vpAdapter = new ViewPagerAdapter(views);
vp.setAdapter(vpAdapter);
//綁定回調
vp.setOnPageChangeListener(this);
//初始化底部小點
initDots();
}
private void initDots() {
LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
dots = new ImageView[pics.length];
//循環取得小點圖片
for (int i = 0; i < pics.length; i++) {
//得到一個LinearLayout下面的每一個子元素
dots[i] = (ImageView) ll.getChildAt(i);
dots[i].setEnabled(true);//都設為灰色
dots[i].setOnClickListener(this);
dots[i].setTag(i);//設置位置tag，方便取出與當前位置對應
}
currentIndex = 0;
dots[currentIndex].setEnabled(false);//設置為白色，即選中狀態
}
private void setCurView(int position)
{
if (position < 0 || position >= pics.length) {
return;
}
vp.setCurrentItem(position);
}
private void setCurDot(int positon)
{
if (positon < 0 || positon > pics.length - 1 || currentIndex == positon) {
return;
}
dots[positon].setEnabled(false);
dots[currentIndex].setEnabled(true);
currentIndex = positon;
}
//當滑動狀態改變時調用
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
//當當前頁面被滑動時調用
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
//當新的頁面被選中時調用
@Override
public void onPageSelected(int arg0) {
//設置底部小點選中狀態
setCurDot(arg0);
}
@Override
public void onClick(View v) {
int position = (Integer)v.getTag();
setCurView(position);
setCurDot(position);
}
public class ViewPagerAdapter extends PagerAdapter{
//界面列表
private List<View> views;
public ViewPagerAdapter (List<View> views){
this.views = views;
}
//銷毀arg1位置的界面
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView(views.get(arg1));
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
//獲得當前界面數
@Override
public int getCount() {
if (views != null)
{
return views.size();
}
return 0;
}
//初始化arg1位置的界面
@Override
public Object instantiateItem(View arg0, int arg1) {
((ViewPager) arg0).addView(views.get(arg1), 0);
return views.get(arg1);
}
//判斷是否由對象生成界面
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return (arg0 == arg1);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
// TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
}
轉自：
http://blog.csdn.net/t80t90s/article/details/7941432
