轮播图+ImageLoader

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package com.example.a13_lunbotu;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.LinearLayout;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

private ViewPager viewPager;
private List<String> list;

private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
if (msg.what == 0){
int currentItem = viewPager.getCurrentItem();
viewPager.setCurrentItem(currentItem+1);

handler.sendEmptyMessageDelayed(0,2000);
}
}
};
private LinearLayout linearLayout;
private List<ImageView> images;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

viewPager = (ViewPager) findViewById(R.id.view_pager);
linearLayout = (LinearLayout) findViewById(R.id.linear_layout);

//数据.....装的是path路径
list = new ArrayList<>();
list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151721118&di=649c9a43aed72fbc4d99ec1a031510c6&imgtype=0&src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F015c7d574b9f8f6ac72525aee98351.jpg");
list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151956771&di=0eb6f306991d24b67a13ceb336f80102&imgtype=0&src=http%3A%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F00613def3f1beb7a35ae136341be2b589bc46a2d.jpg_320x200.jpg");
list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151847685&di=c7a4b5d08ec43fa629bcb690039a7629&imgtype=0&src=http%3A%2F%2Fattimg.dospy.com%2Fimg%2Fday_080625%2F20080625_2e91a10c444877e88827vri2ZKdGMvQo.jpg");
list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151825129&di=70bf74b87d8a15cb91a2d79f15ed0eaf&imgtype=0&src=http%3A%2F%2Fattimg.dospy.com%2Fimg%2Fday_081016%2F20081016_fee215664d5740e56c13E2YB8giERFEX.jpg");
list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505746504&di=930c4d677a02328a142d6fa85ed14580&imgtype=jpg&er=1&src=http%3A%2F%2Fattimg.dospy.com%2Fimg%2Fday_090113%2F20090113_6ac58b42bea94f0b318e1B6BZb5lPZl5.jpg");

//初始化小圆点
initDoc();

//设置适配器
ImagePager imagePager = new ImagePager(MainActivity.this, list,handler);
//
viewPager.setAdapter(imagePager);

//设置ViewPager初始展示的位置
viewPager.setCurrentItem(list.size()*10000);

//发送延时消息
handler.sendEmptyMessageDelayed(0,2000);

//viewPager页面改变的监听事件
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
//如果选中了这一页,,,当前小圆点红色,,,否则绿色
for (int i = 0;i<images.size();i++){
if (i== position%images.size()){
images.get(i).setImageResource(R.drawable.doc_select);
}else {
images.get(i).setImageResource(R.drawable.doc_select_no);
}
}
}

@Override
public void onPageScrollStateChanged(int state) {

}
});
}

/**
* 初始化小圆点
*/
private void initDoc() {
//首先需要一个集合记录这些小圆点的图片,,,,当页面切换的时候,可以从集合中取出imageView进行显示图片的设置
images = new ArrayList<>();
linearLayout.removeAllViews();//清空/移除所有的view

for (int i = 0;i<list.size();i++){
ImageView imageView = new ImageView(MainActivity.this);

if (i==0){//显示第一页,,,红的
imageView.setImageResource(R.drawable.doc_select);
}else {//绿的
imageView.setImageResource(R.drawable.doc_select_no);
}

//添加到集合
images.add(imageView);

//加入到线性布局中显示
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);

params.setMargins(5,0,5,0);

linearLayout.addView(imageView,params);

}

}

}

设置适配器

package com.example.a13_lunbotu;

import android.content.Context;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

/**
* @author Dash
* @date 2017/9/12
* @description:
*/
public class ImagePager extends PagerAdapter {
Context context;
List<String> list;
Handler handler;

public ImagePager(Context context, List<String> list, Handler handler) {
this.context = context;
this.list = list;
this.handler = handler;

//初始化
//ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(context));
}

@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, int position) {
//返回当前显示的视图
ImageView imageView = new ImageView(context);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);

//加载网络的图片
ImageLoader.getInstance().displayImage(list.get(position%list.size()),imageView);

/*imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.i("----","点击事件执行了");
}
});*/

//imageView触摸的监听事件
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
boolean isTiaoZhuan = true;

switch (motionEvent.getAction()){//获取动作
case MotionEvent.ACTION_DOWN://按下
Log.i("--","ACTION_DOWN");
handler.removeCallbacksAndMessages(null);
break;
case MotionEvent.ACTION_MOVE://移动
Log.i("--","ACTION_MOVE");
isTiaoZhuan = false;
handler.removeCallbacksAndMessages(null);

break;
case MotionEvent.ACTION_CANCEL://取消
Log.i("--","ACTION_CANCEL");
isTiaoZhuan = false;
handler.sendEmptyMessageDelayed(0,2000);
break;
case MotionEvent.ACTION_UP://抬起
Log.i("--","ACTION_UP");
if (isTiaoZhuan){
Toast.makeText(context,"跳转页面",Toast.LENGTH_SHORT).show();

/*Intent intent = new Intent();

context.startActivity();*/
}
handler.sendEmptyMessageDelayed(0,2000);

break;
}

//自己处理触摸事件....如果当前位置返回了true,,,点击事件将不会执行,,,表示动作自己处理,不会传递
return true;
}
});

//添加到容器
container.addView(imageView);

return imageView;
}

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

container.removeView((View) object);
}
}

//工具类

package com.example.a13_lunbotu;

import android.content.Context;

import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.decode.BaseImageDecoder;
import com.nostra13.universalimageloader.core.download.BaseImageDownloader;
import com.nostra13.universalimageloader.utils.StorageUtils;

import java.io.File;

/**
* @author Dash
* @date 2017/9/12
* @description:
*/
public class ImageloaderUtil {
public static void initConfig(Context context) {
//配置

File cacheDir = StorageUtils.getCacheDirectory(context); //缓存文件夹路径

ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context)

.threadPoolSize(3) // default 线程池内加载的数量
.threadPriority(Thread.NORM_PRIORITY - 2) // default 设置当前线程的优先级
.tasksProcessingOrder(QueueProcessingType.FIFO) // default
.denyCacheImageMultipleSizesInMemory()
.memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //可以通过自己的内存缓存实现
.memoryCacheSize(2 * 1024 * 1024) // 内存缓存的最大值
.memoryCacheSizePercentage(13) // default
.diskCache(new UnlimitedDiskCache(cacheDir)) // default 可以自定义缓存路径
.diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)缓存的最大值
.diskCacheFileCount(100) // 可以缓存的文件数量
// default为使用HASHCODE对UIL进行加密命名，还可以用MD5(new Md5FileNameGenerator())加密
.diskCacheFileNameGenerator(new HashCodeFileNameGenerator())
.imageDownloader(new BaseImageDownloader(context)) // default
.imageDecoder(new BaseImageDecoder(true)) // default
.defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default
.writeDebugLogs() // 打印debug log
.build(); //开始构建

ImageLoader.getInstance().init(config);

}
}

//初始化需要在清单文件

中注

册

package com.example.a13_lunbotu;

import android.app.Application;

/**
* @author Dash
* @date 2017/9/12
* @description:
*/
public class BaseApplication extends Application {
@Override
public void onCreate() {
super.onCreate();

//初始化
ImageloaderUtil.initConfig(this);
}
}

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