Viewpager 自动轮播（无限循环） ，手动滑动时停止轮播+底部小圆点（二）

项目结构如下：

Volley工具类：

VolleyTool类负责实例化mRequestQueue和mImageLoader。

package com.example.utils;import android.content.Context;import com.android.volley.RequestQueue;import com.android.volley.toolbox.ImageLoader;import com.android.volley.toolbox.Volley;public class VolleyTool {private static VolleyTool mInstance = null;private RequestQueue mRequestQueue;private ImageLoader mImageLoader;private VolleyTool(Context context){mRequestQueue = Volley.newRequestQueue(context);mImageLoader = ImageLoaderUtils.getImageLoader(mRequestQueue);}public static VolleyTool getInstance(Context context){if (mInstance==null) {mInstance = new VolleyTool(context);}return mInstance;}public RequestQueue getmRequestQueue() {return mRequestQueue;}public ImageLoader getmImageLoader() {return mImageLoader;}public void release() {this.mImageLoader = null;this.mRequestQueue = null;mInstance = null;}}

JsonUtils 是解析json数据的工具类

package com.example.utils;import java.io.UnsupportedEncodingException;import java.util.HashMap;import java.util.Map;import org.json.JSONArray;import org.json.JSONObject;import android.content.Context;import android.util.Log;import com.android.volley.AuthFailureError;import com.android.volley.DefaultRetryPolicy;import com.android.volley.NetworkResponse;import com.android.volley.Request;import com.android.volley.RequestQueue;import com.android.volley.Response;import com.android.volley.Response.Listener;import com.android.volley.RetryPolicy;import com.android.volley.VolleyError;import com.android.volley.toolbox.HttpHeaderParser;import com.android.volley.toolbox.JsonArrayRequest;import com.android.volley.toolbox.JsonObjectRequest;import com.android.volley.toolbox.StringRequest;public class JsonUtils {/** * 解析json数据的工具类 *  * @param context * @param json_path * @param callBack * @param queue */public static void parseJsonString(Context context, String json_path,final JsonStringCallBack callBack,final RequestTimeOutCallBack timeOutCallBack, RequestQueue queue) {StringRequest request = new StringRequest(json_path,new Listener<String>() {@Overridepublic void onResponse(String response) {// TODO Auto-generated method stubcallBack.jsonStringCallBack(response);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {timeOutCallBack.timeOutCallBack(error.getMessage());}}) {@Overrideprotected Response<String> parseNetworkResponse(NetworkResponse response) {String str = null;try {str = new String(response.data, "UTF-8");} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}return Response.success(str,HttpHeaderParser.parseCacheHeaders(response));}};request.setRetryPolicy(new DefaultRetryPolicy(4000,DefaultRetryPolicy.DEFAULT_MAX_RETRIES,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));// 添加到队列中queue.add(request);}/** * 解析数组开始的json字符串 *  * @param context * @param json_path * @param callBack * @param queue */public static void parseJsonArray(Context context, String json_path,final JsonArrayCallBack callBack, RequestQueue queue) {JsonArrayRequest request = new JsonArrayRequest(json_path,new Listener<JSONArray>() {@Overridepublic void onResponse(JSONArray response) {// TODO Auto-generated method stubcallBack.jsonArrayCallBack(response);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {// TODO Auto-generated method stubLog.i("TAG", error.getMessage());}});// 添加到队列中queue.add(request);}/** *  * @param context * @param json_path * @param callBack */public static void parseJsonObject(Context context, String json_path,final Map<String, String> map, final JsonObjectCallBack callBack,RequestQueue queue) {JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, json_path, null,new Response.Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject response) {// TODO Auto-generated method stub// System.out.println("----->>response=" + response);callBack.jsonObjectCallBack(response);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {// TODO Auto-generated method stub}}){@Overrideprotected Map<String, String> getParams() throws AuthFailureError {return map;}@Overridepublic Map<String, String> getHeaders() throws AuthFailureError {HashMap<String, String> headers = new HashMap<String, String>();headers.put("Accept", "application/json");headers.put("Content-Type", "application/json; charset=UTF-8");return headers;}};queue.add(jsonObjectRequest);}// 解析json对象的回调接口public interface JsonObjectCallBack {public void jsonObjectCallBack(JSONObject jsonObject);}// 解析json数组的回调接口public interface JsonArrayCallBack {public void jsonArrayCallBack(JSONArray jsonArray);}// 解析json字符串的回调接口public interface JsonStringCallBack {public void jsonStringCallBack(String jsonString);}// 請求超時的回調接口public interface RequestTimeOutCallBack {public void timeOutCallBack(String timeOutString);}}

ImageLoaderUtils图片加载器，为其分配内存空间：

package com.example.utils;import android.graphics.Bitmap;import android.support.v4.util.LruCache;import com.android.volley.RequestQueue;import com.android.volley.toolbox.ImageLoader;import com.android.volley.toolbox.ImageLoader.ImageCache;public class ImageLoaderUtils {private static ImageLoader imageLoader;public static ImageLoader getImageLoader(RequestQueue requestQueue) {if (imageLoader == null) {//单例模式imageLoader = new ImageLoader(requestQueue, new ImageCache() {private LruCache<String, Bitmap> cache = new LruCache<String, Bitmap>((int) Runtime.getRuntime().maxMemory() / 4) {//因图片很多故在此处为4，本应为8@Overrideprotected void entryRemoved(boolean evicted, String key,Bitmap oldValue, Bitmap newValue) {super.entryRemoved(evicted, key, oldValue, newValue);//如果为true为存满后 挤出来的if (evicted) {oldValue.recycle();oldValue = null;}}@Overrideprotected int sizeOf(String key, Bitmap value) {return value.getRowBytes() * value.getHeight();}};@Overridepublic void putBitmap(String url, Bitmap bitmap) {// TODO Auto-generated method stubcache.put(url, bitmap);}@Overridepublic Bitmap getBitmap(String url) {// TODO Auto-generated method stubreturn cache.get(url);}});}return imageLoader;}public static void LetImageLoaderToGc(){imageLoader=null;}}

MainActivity类如下：

package com.example.android_atuoviewpager;import java.lang.ref.WeakReference;import java.util.ArrayList;import java.util.List;import org.json.JSONArray;import org.json.JSONObject;import com.android.volley.toolbox.NetworkImageView;import com.example.utils.JsonUtils;import com.example.utils.VolleyTool;import com.example.utils.JsonUtils.JsonStringCallBack;import com.example.utils.JsonUtils.RequestTimeOutCallBack;import android.os.Bundle;import android.os.Message;import android.app.Activity;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.view.ViewParent;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.LinearLayout.LayoutParams;public class MainActivity extends Activity {private static final String LOG_TAG = "MainActivity";      public ImageHandler handler = new ImageHandler(new WeakReference<MainActivity>(this));      public ViewPager viewPager;     private ImageAdapter imageAdapter;    ArrayList<NetworkImageView> newImageViews;    private List<HeadImage> imageLists;    private NetworkImageView networkImageView;    private ViewGroup group; // 图中小圆点Groupprivate ImageView[] imageDots = null; // 小圆点数组集合// 假数据private String json_path = "http://open.cms.pcpop.com/Mobile/GetPop_Mobile.ashx?method=hand&Eid=8613&HandType=Index_pic#";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);          //初始化iewPager的内容          viewPager = (ViewPager) findViewById(R.id.main_viewpager);          group = (ViewGroup) findViewById(R.id.point_group);        parseImageData();        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {                             //配合Adapter的currentItem字段进行设置。              @Override              public void onPageSelected(int arg0) {                  handler.sendMessage(Message.obtain(handler, ImageHandler.MSG_PAGE_CHANGED, arg0, 0));                  int currentPosition = arg0 % newImageViews.size();    for (int i = 0; i < newImageViews.size(); i++) {    imageDots[currentPosition]    .setBackgroundResource(R.drawable.test_greenicon);    if (currentPosition != i) {    imageDots[i]    .setBackgroundResource(R.drawable.test_grayicon);    }    }            }                             @Override              public void onPageScrolled(int arg0, float arg1, int arg2) {              }                             //覆写该方法实现轮播效果的暂停和恢复              @Override              public void onPageScrollStateChanged(int arg0) {                  switch (arg0) {                  case ViewPager.SCROLL_STATE_DRAGGING:                      handler.sendEmptyMessage(ImageHandler.MSG_KEEP_SILENT);                      break;                  case ViewPager.SCROLL_STATE_IDLE:                      handler.sendEmptyMessageDelayed(ImageHandler.MSG_UPDATE_IMAGE, ImageHandler.MSG_DELAY);                      break;                  default:                      break;                  }              }          });          viewPager.setCurrentItem(Integer.MAX_VALUE/2);//默认在中间，使用户看不到边界          //开始轮播效果          handler.sendEmptyMessageDelayed(ImageHandler.MSG_BREAK_SILENT, ImageHandler.MSG_DELAY);      }private void parseImageData() {JsonUtils.parseJsonString(this, json_path,new JsonStringCallBack() {@Overridepublic void jsonStringCallBack(String jsonString) {parseJsonImage(jsonString);System.out.println("---->>"+imageLists.get(0).getClickUrl()+"---->>");imageAdapter = new ImageAdapter(newImageViews);viewPager.setAdapter(imageAdapter); imageAdapter.notifyDataSetChanged();}}, new RequestTimeOutCallBack() {@Overridepublic void timeOutCallBack(String timeOutString) {}}, VolleyTool.getInstance(this).getmRequestQueue());}/** * 解析首页焦点图数据 *  * @param jsonString *            获取到的json字符串 * @return */private List<HeadImage> parseJsonImage(String jsonString) {imageLists = new ArrayList<HeadImage>();newImageViews = new ArrayList<NetworkImageView>();try {JSONObject jsonObject = new JSONObject(jsonString).getJSONObject("info");JSONArray jsonArray = jsonObject.getJSONArray("infolist");for (int i = 0; i < jsonArray.length(); i++) {JSONObject jsonElement = jsonArray.getJSONObject(i);HeadImage headImage = new HeadImage();headImage.setIndexArtid(jsonElement.getString("IndexArtid"));headImage.setIndexImgurl(jsonElement.getString("IndexImgurl"));headImage.setClickUrl(jsonElement.getString("ClickUrl"));headImage.setArtType(jsonElement.getInt("ArtType"));imageLists.add(headImage);}for (int i = 0; i < imageLists.size(); i++) {networkImageView = new NetworkImageView(this);networkImageView.setScaleType(ScaleType.FIT_XY);networkImageView.setDefaultImageResId(R.drawable.ic_launcher);networkImageView.setImageUrl(imageLists.get(i).getIndexImgurl(), VolleyTool.getInstance(this).getmImageLoader());newImageViews.add(networkImageView);}group.removeAllViews();imageDots = new ImageView[imageLists.size()];for (int i = 0; i < imageDots.length; i++) {imageDots[i] = new ImageView(this);// 设置参数LayoutParams params = new LayoutParams(15, 15);params.gravity = Gravity.CENTER_HORIZONTAL;params.setMargins(6, 0, 6, 0);imageDots[i].setLayoutParams(params);imageDots[i].setPadding(20, 0, 20, 0);if (i == 0) {imageDots[i].setBackgroundResource(R.drawable.test_greenicon);} else {imageDots[i].setBackgroundResource(R.drawable.test_grayicon);}group.addView(imageDots[i]);}} catch (Exception e) {e.printStackTrace();}return imageLists;}public class ImageAdapter extends PagerAdapter {private ArrayList<NetworkImageView> viewlist ;         public ImageAdapter(ArrayList<NetworkImageView> viewlist) {          this.viewlist = viewlist;      }      @Override      public int getCount() {          //设置成最大，使用户看不到边界          return Integer.MAX_VALUE;      }      @Override      public boolean isViewFromObject(View arg0, Object arg1) {          return arg0==arg1;      }       @Override         public void destroyItem(ViewGroup container, int position,                 Object object) {             //Warning：不要在这里调用removeView       }         @Override         public Object instantiateItem(ViewGroup container, int position) {           //对ViewPager页号求模取出View列表中要显示的项           position %= viewlist.size();           if (position<0){               position = viewlist.size()+position;           }           ImageView view = viewlist.get(position);           //如果View已经在之前添加到了一个父组件，则必须先remove，否则会抛出IllegalStateException。           ViewParent vp =view.getParent();           if (vp!=null){               ViewGroup parent = (ViewGroup)vp;               parent.removeView(view);           }           container.addView(view);             //add listeners here if necessary           return view;         } }}

源码下载地址：

http://download.csdn.net/detail/shr957250701/8168307