使用ViewPager能够得到不同view的切换效果
例如以下图，实现了四个view间的相互滑动
一、新建项目，引入ViewPager控件
ViewPager。它是google SDk中自带的一个附加包的一个类，能够用来实现屏幕间的切换。<LinearLayout 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"
tools:context="com.skyfin.viewpage.MainActivity" >
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
</android.support.v4.view.ViewPager>
</LinearLayout>
2、新建四个LinearLayout，用于滑动切换的视图
<?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:background="@color/antiquewhite"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="tab2"
android:textSize="20dp"
android:textColor="@color/black"
/>
</LinearLayout>
3加载代码段将视图加载Viewpager中
import android.R.id;
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.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends Activity {
ViewPager ViewPager = null;
public String TAG = "tag";
ArrayList<View> viewContainter = new ArrayList<View>();
ArrayList<String> titleContainer = new ArrayList<String>();
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager = (ViewPager)findViewById(R.id.pager);
View view1 = LayoutInflater.from(this).inflate(R.layout.tab1, null);
View view2 = LayoutInflater.from(this).inflate(R.layout.tab2, null);
View view3 = LayoutInflater.from(this).inflate(R.layout.tab3, null);
View view4 = LayoutInflater.from(this).inflate(R.layout.tab4, null);
//viewpager開始加入view
viewContainter.add(view1);
viewContainter.add(view2);
viewContainter.add(view3);
viewContainter.add(view4);
ViewPager.setAdapter(new PagerAdapter() {
//viewpager中的组件数量
@Override
public int getCount() {
return viewContainter.size();
}
//滑动切换的时候销毁当前的组件
@Override
public void destroyItem(ViewGroup container, int position,
Object object) {
((ViewPager) container).removeView(viewContainter.get(position));
}
//每次滑动的时候生成的组件
@Override
public Object instantiateItem(ViewGroup container, int position) {
((ViewPager) container).addView(viewContainter.get(position));
return viewContainter.get(position);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
});
ViewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int arg0) {
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
代码具体解释
1.定义一个ViewPager的容器
ViewPager ViewPager = null; ArrayList<View> viewContainter = new ArrayList<View>();
2.初始化换View和ViewPager且加入到View的容器viewContainter中
View view1 = LayoutInflater.from(this).inflate(R.layout.tab1, null);
View view2 = LayoutInflater.from(this).inflate(R.layout.tab2, null);
View view3 = LayoutInflater.from(this).inflate(R.layout.tab3, null);
View view4 = LayoutInflater.from(this).inflate(R.layout.tab4, null);
//viewpager開始加入view
viewContainter.add(view1);
viewContainter.add(view2);
viewContainter.add(view3);
viewContainter.add(view4);
3.加入到PagerAdapter中而且设置监听
ViewPager.setAdapter(new PagerAdapter() {
//viewpager中的组件数量
@Override
public int getCount() {
return viewContainter.size();
}
//滑动切换的时候销毁当前的组件
@Override
public void destroyItem(ViewGroup container, int position,
Object object) {
((ViewPager) container).removeView(viewContainter.get(position));
}
//每次滑动的时候生成的组件
@Override
public Object instantiateItem(ViewGroup container, int position) {
((ViewPager) container).addView(viewContainter.get(position));
return viewContainter.get(position);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
@Override
public CharSequence getPageTitle(int position) {
return titleContainer.get(position);
}
});
ViewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int arg0) {
}
});
PageAdapter 必须重写的四个函数：
- boolean isViewFromObject(View arg0, Object arg1)
- int getCount()
- void destroyItem(ViewGroup container, int position,Object object)
- Object instantiateItem(ViewGroup container, int position)
先看看各个函数，我们上面都做了什么吧：
- @Override
- public int getCount() {
- // TODO Auto-generated method stub
- return viewList.size();
- }
- @Override
- public void destroyItem(ViewGroup container, int position,
- Object object) {
- // TODO Auto-generated method stub
- container.removeView(viewList.get(position));
- }
- @Override
- public Object instantiateItem(ViewGroup container, int position) {
- // TODO Auto-generated method stub
- container.addView(viewList.get(position));
- return viewList.get(position);
- }
- };
- @Override
- public boolean isViewFromObject(View arg0, Object arg1) {
- // TODO Auto-generated method stub
- return arg0 == arg1;
- }