轮播图触摸监听事件

重点在适配器： 

package com.example.dell.androidstudio_workspace09.Adapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.view.PagerAdapter;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

import com.example.dell.androidstudio_workspace09.Main3Activity;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;

import java.util.List;
import java.util.logging.Handler;

/**
 * Created by DELL on 2018/5/2.
 */

public class MyImgAdapter extends PagerAdapter{

    private List<String> imgs;
    private android.os.Handler handler;
    private Context context;
    private final DisplayImageOptions options;

    public MyImgAdapter(List<String> imgs, android.os.Handler handler, Context context) {
        this.imgs = imgs;
        this.handler = handler;
        this.context = context;

        //使用内存缓存
        //使用磁盘缓存
        //设置图片色彩模式
        //设置图片的缩放模式
        options = new DisplayImageOptions.Builder()
                .cacheInMemory(true)//使用内存缓存
                .cacheOnDisk(true)//使用磁盘缓存
                .bitmapConfig(Bitmap.Config.RGB_565)//设置图片色彩模式
                .imageScaleType(ImageScaleType.EXACTLY)//设置图片的缩放模式
                .build();

    }

    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }



    @Override
    public Object instantiateItem(ViewGroup container, final int position) {

        ImageView imageView = new ImageView(context);

        imageView.setScaleType(ImageView.ScaleType.FIT_XY);

        ImageLoader.getInstance().displayImage(imgs.get(position%imgs.size()),imageView,options);

        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, imgs.get(position%imgs.size()), Toast.LENGTH_SHORT).show();
            }
        });

        imageView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {

                switch (motionEvent.getAction()){
                    //手指按下
                    case MotionEvent.ACTION_DOWN:
                        handler.removeCallbacksAndMessages(null);
                        break;

                    case MotionEvent.ACTION_MOVE:
                        handler.removeCallbacksAndMessages(null);
                        break;

                    case MotionEvent.ACTION_UP:
                        Toast.makeText(context,"up",Toast.LENGTH_SHORT).show();
                        handler.sendEmptyMessageDelayed(1,2000);
                        break;

                    case MotionEvent.ACTION_CANCEL:
                        Toast.makeText(context,"cancel",Toast.LENGTH_SHORT).show();
                        handler.sendEmptyMessageDelayed(1,2000);
                        break;
                }

                return true;
            }
        });

        container.addView(imageView);

        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {

        container.removeView((View) object);

    }
}