使用ViewPager进行页面滑动切换
android上边需要滑动切换的地方太频繁了，一般引导页，主框架用得都比较多，
而使用ViewPager可以很方便的实现
一：实现一个简单的滑动切换需要3个东东
1:页面增加一个android.support.v4.view.ViewPager布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/page"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" >
</android.support.v4.view.ViewPager>
</LinearLayout>
2: 实现一个PagerAdapter
PagerAdapter主要是用来管理需要切换的页面的，比如有多少个需要切换的页面，
更新清除页面等
class MyPagerAdapter extends PagerAdapter
{
List<View> views;
public MyPagerAdapter(List<View> v) {
super();
// TODO Auto-generated constructor stub
views = v;
}
@Override
public void destroyItem(View v, int pos, Object arg2) {
// TODO Auto-generated method stub
((ViewPager) v).removeView(views.get(pos));
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return views.size();
}
@Override
public Object instantiateItem(View v, int pos) {
// TODO Auto-generated method stub
((ViewPager) v).addView(views.get(pos));
return views.get(pos);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
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
}
}
3:给ViewPager添加刚刚实现的PagerAdapter
给 PagerAdapter构造函数添加的List<View>就是你要进行滑动切换的页面 @Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.view_page);
myviewpage = (ViewPager)findViewById(R.id.page);
LayoutInflater inflater = getLayoutInflater();
List<View> listviews = new ArrayList<View>();
listviews.add(inflater.inflate(R.layout.fragment1, null));
listviews.add(inflater.inflate(R.layout.fragment2, null));
listviews.add(inflater.inflate(R.layout.fragment1, null));
MyPagerAdapter mypagetadapter = new MyPagerAdapter(listviews);
myviewpage.setAdapter(mypagetadapter);
}好现在就可以进行添加页面的滑动切换了
二：实现一个带指示器的滑动切换
只需要在上一个的基础上加一点东西，用来指示当前是第几页，
需要使用到2点
1：viewpage的setOnPageChangeListener事件可以知道得到是第几页
2：使用TranslateAnimation动画进行指示图片的位置变化即可
TranslateAnimation的简单介绍http://blog.csdn.net/aojiancc2/article/details/18664819
增加后的布局文件，就多了一个按钮和指示图片
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout android:id="@+id/nav"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:background="#efefef">
<TextView
android:id="@+id/tab1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:gravity="center"
android:textColor="#000000"
android:text="页片1" />
<TextView
android:id="@+id/tab2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:gravity="center"
android:textColor="#000000"
android:text="页片2" />
<TextView
android:id="@+id/tab3"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0"
android:gravity="center"
android:textColor="#000000"
android:text="页片3" />
</LinearLayout>
<ImageView android:id="@+id/cursor"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="matrix"
android:src="@drawable/img_cursor"/>
<android.support.v4.view.ViewPager
android:id="@+id/page"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" >
</android.support.v4.view.ViewPager>
</LinearLayout>
主类：
public class MyViewPage extends Activity{
private ViewPager myviewpage;
private ImageView cursor; //图片游标
private int offset=0; //动画图片偏移量
private int currIndex=0; //当前卡片编号
private int bmgW; //动画图片宽度
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.view_page);
initAnima();
myviewpage = (ViewPager)findViewById(R.id.page);
LayoutInflater inflater = getLayoutInflater();
List<View> listviews = new ArrayList<View>();
listviews.add(inflater.inflate(R.layout.fragment1, null));
listviews.add(inflater.inflate(R.layout.fragment2, null));
listviews.add(inflater.inflate(R.layout.fragment1, null));
MyPagerAdapter mypagetadapter = new MyPagerAdapter(listviews);
myviewpage.setAdapter(mypagetadapter);
addPoint();
}
//初始化动画
private void initAnima(){
cursor = (ImageView)findViewById(R.id.cursor); //初始化游标图片
bmgW = BitmapFactory.decodeResource(getResources(), R.drawable.img_cursor).getWidth(); //得到游标的宽度
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenW = dm.widthPixels; //屏幕宽度
offset=(screenW/3-bmgW)/2; //游标偏移量 ,可以正好让图片在中间
Matrix matrix=new Matrix();
matrix.postTranslate(offset,0);
cursor.setImageMatrix(matrix); //游标初始位置
}
private void addPoint()
{
myviewpage.setOnPageChangeListener(new OnPageChangeListener(){
int one = offset*2+bmgW; //页片1->页片2 偏移量
int two=one*2; //页片1->页片3偏移量 ,主要是晓得现在距离左边多少位置
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
//表示当前是那个页面选中,在来计算图片的位置
@Override
public void onPageSelected(int pos) {
// TODO Auto-generated method stub
Animation animation = null;
switch (pos) {
case 0:
if(currIndex==1){
animation=new TranslateAnimation(one, 0, 0, 0);
}else if(currIndex==2){
animation=new TranslateAnimation(two, 0, 0, 0);
}
break;
case 1:
if(currIndex==0){
animation=new TranslateAnimation(offset, one, 0, 0);
}else if(currIndex==2){
animation=new TranslateAnimation(two, one, 0, 0);
}
break;
case 2:
if(currIndex==1){
animation=new TranslateAnimation(one, two, 0, 0);
}else if(currIndex==0){
animation=new TranslateAnimation(offset, two, 0, 0);
}
break;
default:
break;
}
currIndex=pos;
animation.setFillAfter(true);
animation.setDuration(300);
cursor.setAnimation(animation);
}});
}
}
//其实就是用来管理ViewPager的
class MyPagerAdapter extends PagerAdapter
{
List<View> views;
public MyPagerAdapter(List<View> v) {
super();
// TODO Auto-generated constructor stub
views = v;
}
@Override
public void destroyItem(View v, int pos, Object arg2) {
// TODO Auto-generated method stub
((ViewPager) v).removeView(views.get(pos));
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return views.size();
}
@Override
public Object instantiateItem(View v, int pos) {
// TODO Auto-generated method stub
((ViewPager) v).addView(views.get(pos));
return views.get(pos);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
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
}
}
下载http://acapekbhng.l18.yunpan.cn/lk/Qh5RCcjJkMvhy a271
注意:添加到viewpager的view不能是已经添加到布局文件中的控件了，可以再后台用实例化先的方式去添加
例如添加一张图片
ImageView imageView = new ImageView(this);
imageView.setBackgroundResource(R.drawable.item03);
listviews.add(imageView);