ViewPager 使用详解
使用ViewPagerg构建一个视图组,实现对视图的侧滑切换。ViewPager是一个V4的组件,在XML中通过android.support.v4.view.ViewPager的方式调用。
工程目录:
效果图:
MainActivity :
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends Activity {
private View view1, view2, view3;
private ViewPager viewPager; // 对应的viewPager
private List<View> viewList;// view数组
private ArrayList<String> list;
private PagerTabStrip pagerTabStrip;// 标题栏
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewpager);
view1 = getLayoutInflater().inflate(R.layout.layout1, null);
view2 = getLayoutInflater().inflate(R.layout.layout2, null);
view3 = getLayoutInflater().inflate(R.layout.layout3, null);
pagerTabStrip = (PagerTabStrip) findViewById(R.id.pagertab);
// 改变下划线的颜色
pagerTabStrip
.setTabIndicatorColorResource(android.R.color.holo_green_dark);
viewList = new ArrayList<View>();// 将要分页显示的View装入数组中
viewList.add(view1);
viewList.add(view2);
viewList.add(view3);
list = new ArrayList<String>();
list.add("1");
list.add("2");
list.add("3");
// 定义适配器
PagerAdapter pagerAdapter = new PagerAdapter() {
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
// 1、必须重写。
return arg0 == arg1;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
// 2、必须重写。返回要滑动的VIew的个数
return viewList.size();
}
@Override
public void destroyItem(ViewGroup container, int position,
Object object) {
// TODO Auto-generated method stub
// 3、必须重写。从当前container中删除指定位置(position)的View
container.removeView(viewList.get(position));
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// TODO Auto-generated method stub
// 4、必须重写。将当前视图添加到container中,第二:返回当前View
container.addView(viewList.get(position));
return viewList.get(position);
}
@Override
public CharSequence getPageTitle(int position) {
// 使用标题栏必须重写。根据位置返回当前所对应的标题
return list.get(position);
}
};
// 添加适配器到viewPager
viewPager.setAdapter(pagerAdapter);
}
}
activity_mian.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context="com.example.testviewpage_1.MainActivity" >
<!-- 要滑动的视图组件 -->
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" >
<!-- 标题栏 将PagerTabStrip作为ViewPager的一个子控件直接插入其中 -->
<android.support.v4.view.PagerTabStrip
android:id="@+id/pagertab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top" />
</android.support.v4.view.ViewPager>
</RelativeLayout>
view1:
<?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:background="#330044">
</LinearLayout>
view2:
<?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:background="#990077" >
</LinearLayout>
view3:
<?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:background="#772255">
</LinearLayout>