Android studio 实现图片左右滑动效果有很多种方法：
1. ImageSwitcher
2. ViewPager
3. RecyclerView
其中RecyclerView是功能很强大的，和ListView、GridView类似，这里暂时不谈。
ImageSwitcher使用起来很简单，只需要在xml中创建一个ImageSwitcher的组件，并在java中创建一个factory并配置给ImageSwitcher，再给ImageSwitcher添加适当的Listener。
其中factory的作用是为ImageSwitcher创建内部的ImageView，要求override makeView的方法。
而且，ImageSwitcher很简单的就可以挂载animation效果，目前我遇到的最大问题是ImageSwitcher配合Picasso载入网络图片有问题，所以改成了ViewPager。
private boolean isLastPage = false;
private boolean isDragPage = false;
private boolean canJumpPage = true;
private ViewPager sliderLayout;
private DetailImageAdapter dia =new DetailImageAdapter(mainActivity,al);
sliderLayout.setAdapter(dia);
sliderLayout.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
/**
* swipe
* @param position position
* @param positionOffset move offset, 0/1
* @param positionOffsetPixels image move offset
*/
@Override
public void onPageScrolled(int position,float positionOffset,int positionOffsetPixels) {
if (isLastPage &&isDragPage && positionOffsetPixels ==0){
if (canJumpPage){
canJumpPage =false;
Toast.makeText(mainActivity,"last page", Toast.LENGTH_SHORT).show();
}
}
}
/**
* display effect between the three.
* @param position the current page index
*/
@Override
public void onPageSelected(int position) {
isLastPage = position ==al.size() -1 ;
switchPoint(position);
}
/**
* screen
* @param state 0（END）,1(PRESS) , 2(UP) 。
*/
@Override
public void onPageScrollStateChanged(int state) {
isDragPage = state ==1;
}
});
自定义了Adapter
import android.annotation.SuppressLint;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
public class DetailImageAdapterextends PagerAdapter {
Contextcontext;
ArrayListimages;
DetailImageAdapter(Context context, ArrayList al) {
this.context = context;
this.images = al;
}
@Override
public int getCount() {
return images.size();
}
@Override
public boolean isViewFromObject(@NonNull View view,@NonNull Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container,int position) {
LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
assert layoutInflater !=null;
@SuppressLint("InflateParams")
View view = layoutInflater.inflate(R.layout.detailimage,null);
ImageView imageView = view.findViewById(R.id.img_house);
Picasso.get().load((images.get(position))).fit().centerCrop().into(imageView);
ViewPager vp = (ViewPager) container;
vp.addView(view,0);
return view;
}
@Override
public void destroyItem (ViewGroup container,int position, Object object) {
ViewPager vp = (ViewPager) container;
View view = (View) object;
vp.removeView(view);
}
}
