图片发自简书App
1、引入android-support-v4.jar包，在主布局里加入
< ?xml version="1.0" encoding="utf-8"?>
< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/layout"
tools:context="com.zjq.viewpager.MainActivity">
< android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content">
< /android.support.v4.view.ViewPager>
< LinearLayout
android:id="@+id/viewGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="40dp"
android:gravity="center_horizontal"
android:orientation="horizontal" >
< /LinearLayout>
< /RelativeLayout >
其他几个子布局都一样 例如 item01 :
< ?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">
< ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/view1"
android:scaleType="centerCrop"
/>
2、加载切换内容
3、ViewPager加载适配器PagerAdapter
public class MainActivity extends Activity {
private ViewPager viewPager;
private ArrayList pageview;
private ImageView imageView;
private ImageView[] imageViews;
//包裹点点的LinearLayout
private ViewGroup group;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewPager);
//查找布局文件用LayoutInflater.inflate
LayoutInflater inflater =getLayoutInflater();
View view1 = inflater.inflate(R.layout.item01, null);
View view2 = inflater.inflate(R.layout.item02, null);
View view3 = inflater.inflate(R.layout.item03, null);
View view4 = inflater.inflate(R.layout.item04, null);
//将view装入数组
pageview =new ArrayList();
pageview.add(view1);
pageview.add(view2);
pageview.add(view3);
pageview.add(view4);
group = (ViewGroup)findViewById(R.id.viewGroup);
//有多少张图就有多少个点点
imageViews = new ImageView[pageview.size()];
for(int i =0;i
imageView = new ImageView(MainActivity.this);
imageView.setLayoutParams(new LayoutParams(20,20));
imageView.setPadding(20, 0, 20, 0);
imageViews[i] = imageView;
//默认第一张图显示为选中状态
if (i == 0) {
imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);
} else {
imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
}
group.addView(imageViews[i]);
}
//绑定适配器
viewPager.setAdapter(mPagerAdapter);
//绑定监听事件
viewPager.setOnPageChangeListener(new GuidePageChangeListener());
}
//数据适配器
PagerAdapter mPagerAdapter = new PagerAdapter(){
@Override
//获取当前窗体界面数
public int getCount() {
// TODO Auto-generated method stub
return pageview.size();
}
@Override
//断是否由对象生成界面
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0==arg1;
}
//是从ViewGroup中移出当前View
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView(pageview.get(arg1));
}
//返回一个对象，这个对象表明了PagerAdapter适配器选择哪个对象放在当前的ViewPager中
public Object instantiateItem(View arg0, int arg1){
((ViewPager)arg0).addView(pageview.get(arg1));
return pageview.get(arg1);
}
};
//pageView监听器
class GuidePageChangeListener implements OnPageChangeListener{
@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
}
@Override
//如果切换了，就把当前的点点设置为选中背景，其他设置未选中背景
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
for(int i=0;i
imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);
if (arg0 != i) {
imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
}
}
}
} }
