一viewpager
1viewpager继承ViewGroup类
2viewpager经常与fragment一起用
3viewpager的主要用到一个pageradpter类是fragmentpageradpter类，两个组件类是Pagertitlestrip类和Pagertabstrip类
二代码实现：
layout.xml:
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<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" tools:context=".MainActivity" > <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="wrap_content" android:layout_height="wrap_content" > <android.support.v4.view.PagerTabStrip android:id="@+id/tabstrip" android:layout_width="wrap_content" android:layout_height="50dip" android:gravity="center" /> </android.support.v4.view.ViewPager></RelativeLayout> |
MainActivity.java
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package com.example.android_viewpager1;import java.util.ArrayList;import android.annotation.SuppressLint;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.View;import android.view.ViewGroup;public class MainActivity extends Activity { ViewPager pager = null; PagerTabStrip tabStrip = null; ArrayList<View> viewContainter = new ArrayList<View>(); ArrayList<String> titleContainer = new ArrayList<String>(); public String TAG = "tag"; @SuppressLint("ResourceAsColor") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pager = (ViewPager) this.findViewById(R.id.viewpager); tabStrip = (PagerTabStrip) this.findViewById(R.id.tabstrip); //取消tab下面的长横线 tabStrip.setDrawFullUnderline(false); //设置tab的背景色 tabStrip.setBackgroundColor(this.getResources().getColor(R.color.bg)); //设置当前tab页签的下划线颜色 tabStrip.setTabIndicatorColor(this.getResources().getColor(R.color.red)); tabStrip.setTextSpacing(200); 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开始添加view viewContainter.add(view1); viewContainter.add(view2); viewContainter.add(view3); viewContainter.add(view4); //页签项 titleContainer.add("网易新闻"); titleContainer.add("网易体育"); titleContainer.add("网易财经"); titleContainer.add("网易女人"); pager.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); } }); pager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageScrollStateChanged(int arg0) { Log.d(TAG, "--------changed:" + arg0); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { Log.d(TAG, "-------scrolled arg0:" + arg0); Log.d(TAG, "-------scrolled arg1:" + arg1); Log.d(TAG, "-------scrolled arg2:" + arg2); } @Override public void onPageSelected(int arg0) { Log.d(TAG, "------selected:" + arg0); } }); }} |