100字范文 > android:viewpager实现图片循环滑动+索引点击事件

android:viewpager实现图片循环滑动+索引点击事件

时间：2022-04-06 05:06:58

先付上运行结果

这画质 o(︶︿︶)o 唉。。

至于左右循环滑动的原理就是把viewpager相关的代码改成无限循环。需要自定义ViewPagerAdapter

layout布局：

MainActivity

package com.example.viewpager;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup.LayoutParams;import android.view.Window;import android.widget.ImageView;import android.widget.ImageView.ScaleType;public class MainActivity extends Activity implements OnPageChangeListener,OnClickListener {private List<View> list_image = new ArrayList<View>();private ViewPager pager;private int img[] = { R.drawable.beauty1, R.drawable.beauty2,R.drawable.beauty3, R.drawable.beauty4, R.drawable.beauty5,R.drawable.beauty6, R.drawable.beauty7, R.drawable.beauty8,R.drawable.beauty9 };private ImageView point[];private int pointId[] = { R.id.imagePoint1, R.id.imagePoint2,R.id.imagePoint3, R.id.imagePoint4, R.id.imagePoint5,R.id.imagePoint6, R.id.imagePoint7, R.id.imagePoint8,R.id.imagePoint9 };@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);pager = (ViewPager) findViewById(R.id.pager);initData();initPoint();MyViewPagerAdapter adapter = new MyViewPagerAdapter(list_image,img.length);pager.setAdapter(adapter);pager.setOnPageChangeListener(this);// 这个是最主要的为了使pager能够循环切换初始的位置较大一点pager.setCurrentItem(img.length * 100);}// 初始化索引并且为其添加点击事件private void initPoint() {// TODO Auto-generated method stubpoint = new ImageView[img.length];for (int i = 0; i < img.length; i++) {point[i] = (ImageView) findViewById(pointId[i]);point[i].setOnClickListener(this);point[i].setTag(i);}}// 初始化list集合private void initData() {// TODO Auto-generated method stubfor (int i : img) {ImageView imageView = new ImageView(this);LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);imageView.setImageResource(i);imageView.setScaleType(ScaleType.FIT_XY);imageView.setLayoutParams(params);list_image.add(imageView);}}/** 改变索引的背景图片*/private void pointChange(int position) {position = position % (img.length);for (int i = 0; i < img.length; i++) {point[i].setImageResource(R.drawable.page_unchoose);}point[position].setImageResource(R.drawable.page_choose);}@Overridepublic void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stub}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {// TODO Auto-generated method stub}@Overridepublic void onPageSelected(int position) {// TODO Auto-generated method stubpointChange(position);}/** 索引的点击事件，点击后对应的索引变色并且图片切换到相应的图片*/@Overridepublic void onClick(View v) {// TODO Auto-generated method stubint position = (Integer) v.getTag();pointChange(position);/** try----catch捕捉异常第一次程序一直崩溃加了这个就好多了 * 我想着应该是pager已经添加了这张图片执行这个语句会再添加一次* 只是我认为的。。*/try {pager.setCurrentItem(pager.getCurrentItem()/img.length*img.length + position);} catch (Exception e) {}}}

自定义的ViewPagerAdapter

package com.example.viewpager;import java.util.ArrayList;import java.util.List;import android.support.v4.view.PagerAdapter;import android.util.Log;import android.view.View;import android.view.ViewGroup;public class MyViewPagerAdapter extends PagerAdapter {private List<View> list_image = new ArrayList<View>();private int imgLenth;public MyViewPagerAdapter(List<View> list_image, int imgLenth) {this.list_image = list_image;this.imgLenth = imgLenth;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn 10000;}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {// TODO Auto-generated method stubreturn arg0 == arg1;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {// TODO Auto-generated method stub//取余很重要呀 list集合里面就那么几张图片container.addView(list_image.get(position % imgLenth));return list_image.get(position % imgLenth);}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {// TODO Auto-generated method stub//同上container.removeView(list_image.get(position % imgLenth));}}

发现有个bug 而我不能解决。。。

滑动没有问题可是当我点击索引的时候偶尔会出现空白的情况这时候再滑动一下就出来了不知道为什么 debug了一下午。。等我解决了在更新一下~

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