使用ViewPager实现左右循环滑动
这篇是在实现了使用ViewPager实现高仿launcher拖动效果的基础上做了一些小的修改，可以参照前面的。废话不多说了，直接上代码吧！首先看一些layout下的xml
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[*] <?xml version="1.0" encoding="utf-8"?>
[*] <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
[*] android:layout_width="fill_parent"
[*] android:layout_height="fill_parent"
[*] android:orientation="vertical" >
[*]
[*] <android.support.v4.view.ViewPager
[*] android:id="@+id/viewPager"
[*] android:layout_width="fill_parent"
[*] android:layout_height="wrap_content" />
[*]
[*] <RelativeLayout
[*] android:layout_width="fill_parent"
[*] android:layout_height="wrap_content"
[*] android:orientation="vertical" >
[*]
[*] <LinearLayout
[*] android:id="@+id/viewGroup"
[*] android:layout_width="fill_parent"
[*] android:layout_height="wrap_content"
[*] android:layout_alignParentBottom="true"
[*] android:layout_marginBottom="30dp"
[*] android:gravity="center_horizontal"
[*] android:orientation="horizontal" >
[*] </LinearLayout>
[*] </RelativeLayout>
[*]
[*] </FrameLayout>
和前面一页使用viewpager。使用ViewPager首先需要引入android-support-v4.jar这个jar包。自己不要忘记加。
下面是核心代码：
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[*] package cn.com.karl.viewpager;
[*]
[*] import java.util.ArrayList;
[*]
[*]
[*] import android.app.Activity;
[*] import android.content.Intent;
[*] import android.os.Bundle;
[*] import android.os.Parcelable;
[*] import android.support.v4.view.PagerAdapter;
[*] 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;
[*] import android.view.ViewGroup.LayoutParams;
[*] import android.view.Window;
[*] import android.widget.ImageView;
[*]
[*] public class MainActivity extends Activity {
[*] ViewPager viewPager;
[*] ArrayList<View> list;
[*] ViewGroup main, group;
[*] ImageView imageView;
[*] ImageView[] imageViews;
[*] private static int c_id = 0;
[*] @Override
[*] public void onCreate(Bundle savedInstanceState) {
[*] super.onCreate(savedInstanceState);
[*] this.requestWindowFeature(Window.FEATURE_NO_TITLE);
[*] LayoutInflater inflater = getLayoutInflater();
[*] list = new ArrayList<View>();
[*] list.add(inflater.inflate(R.layout.item1, null));
[*] list.add(inflater.inflate(R.layout.item2, null));
[*] list.add(inflater.inflate(R.layout.item3, null));
[*] list.add(inflater.inflate(R.layout.item4, null));
[*] list.add(inflater.inflate(R.layout.item5, null));
[*]
[*] imageViews = new ImageView;
[*] ViewGroup main = (ViewGroup) inflater.inflate(R.layout.main, null);
[*]
[*] ViewGroup group = (ViewGroup) main.findViewById(R.id.viewGroup);
[*]
[*] viewPager = (ViewPager) main.findViewById(R.id.viewPager);
[*]
[*] for (int i = 0; i < list.size(); i++) {
[*] imageView = new ImageView(MainActivity.this);
[*] imageView.setLayoutParams(new LayoutParams(12,12));
[*] //imageView.setPadding(10, 0, 10, 0);
[*] imageViews = imageView;
[*] if (i == 0) {
[*]
[*] imageViews.setBackgroundResource(R.drawable.guide_dot_white);
[*] } else {
[*] imageViews.setBackgroundResource(R.drawable.guide_dot_black);
[*] }
[*] group.addView(imageView);
[*] }
[*]
[*] setContentView(main);
[*]
[*] viewPager.setAdapter(new MyAdapter());
[*] viewPager.setOnPageChangeListener(new MyListener());
[*] viewPager.setCurrentItem(300);
[*]
[*] }
[*]
[*] class MyAdapter extends PagerAdapter {
[*]
[*] @Override
[*] public int getCount() {
[*] return Integer.MAX_VALUE;
[*] }
[*]
[*] @Override
[*] public boolean isViewFromObject(View arg0, Object arg1) {
[*] return arg0 == arg1;
[*] }
[*]
[*] @Override
[*] public int getItemPosition(Object object) {
[*] // TODO Auto-generated method stub
[*] return super.getItemPosition(object);
[*] }
[*]
[*] @Override
[*] public void destroyItem(View arg0, int arg1, Object arg2) {
[*] // TODO Auto-generated method stub
[*] //((ViewPager) arg0).removeView(list.get(arg1));
[*] }
[*]
[*] @Override
[*] public Object instantiateItem(View arg0, int arg1) {
[*] // TODO Auto-generated method stub
[*] try{
[*] ((ViewPager) arg0).addView(list.get(arg1%list.size()),0);
[*] }catch (Exception e) {
[*] // TODO: handle exception
[*] }
[*] return list.get(arg1%list.size());
[*] }
[*]
[*] @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
[*]
[*] }
[*]
[*] @Override
[*] public void finishUpdate(View arg0) {
[*] // TODO Auto-generated method stub
[*]
[*] }
[*] }
[*]
[*] class MyListener implements OnPageChangeListener {
[*]
[*] //当滑动状态改变时调用
[*] @Override
[*] public void onPageScrollStateChanged(int arg0) {
[*] // TODO Auto-generated method stub
[*] //arg0=arg0%list.size();
[*]
[*] }
[*]
[*] //当当前页面被滑动时调用
[*] @Override
[*] public void onPageScrolled(int arg0, float arg1, int arg2) {
[*] // TODO Auto-generated method stub
[*]
[*] }
[*]
[*] //当新的页面被选中时调用
[*] @Override
[*] public void onPageSelected(int arg0) {
[*] if(arg0>2){
[*] arg0=arg0%list.size();
[*] }
[*] c_id = arg0;
[*] for (int i = 0; i < imageViews.length; i++) {
[*] imageViews
[*] .setBackgroundResource(R.drawable.guide_dot_white);
[*] if (arg0 != i) {
[*] imageViews
[*] .setBackgroundResource(R.drawable.guide_dot_black);
[*] }
[*] }
[*]
[*] Log.e("-------------", "当前是第"+c_id+"页");
[*] }
[*]
[*] }
[*] }
文档来源：51CTO技术博客https://blog.51cto.com/u_14397532/3035635
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