android 下载管理器

android 自带了下载管理器，我们可以获取到下载的进度大小以及下载完成等等的状态，但是android自带的DownLoadManager却没有实现比如暂停，继续等功能也就是不能断点续传，这几天在总下载管理器，写了以后总是感觉还是不是太好，因为下载要考虑的情况是比较多的

1、我们要考虑下载的时候要有下载情况的回调，

2、下载的文件是否已经下载

3、是否已经下载完成

4、下载速度

5、下载的进度

6、下载的过程中暂停，继续，取消等操作

7、可能有些人还要把下载的列表分为a 已经下载完成 b 正在下载

8、还有要加下载完成的通知，或是提示

9、还有listView经常遇到的进度条显示错乱

等等。。。。上网查找了很多的资料，网上有现成的第三方DownloadProvider这个，功能相当的齐全，但是我还是希望自己能写一个

下边是我自己的实现思路

首先 1 、要有一个service 来进行后台下载

2、需要有一个存放下载信息的一个实体类downLoadInfo 包含下载的文件大小，每次下载的大小，下载的速度等

private long id;

@Transient

private HttpHandler<File> handler;

private HttpHandler.State state
private String downloadUrl;
private String fileName;
private String fileSavePath;
private long progress;
private long fileLength;
private boolean autoResume;
private boolean autoRename;
private float speed;

3、一个下载管理器；进行下载的管理，已经下载进度的回调

下载我使用的是第三方的xutils

4 、一个DownLoadAdapter用来给listView填充数据

整体来讲就是这么多。

下载管理器代码如下

package cn.com.huahuawifi.android.guest.download;import android.content.Context;
import android.database.Cursor;
import android.util.Log;import cn.com.huahuawifi.android.guest.util.Utils;
import cn.com.huahuawifi.android.guest.util.XUtilsHttpUtil;import com.lidroid.xutils.DbUtils;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.db.converter.ColumnConverter;
import com.lidroid.xutils.db.converter.ColumnConverterFactory;
import com.lidroid.xutils.db.sqlite.ColumnDbType;
import com.lidroid.xutils.db.sqlite.Selector;
import com.lidroid.xutils.exception.DbException;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.HttpHandler;
import com.lidroid.xutils.http.HttpHandler.State;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.util.LogUtils;import java.io.File;
import java.util.ArrayList;
import java.util.List;/*** 下载管理器*/
public class DownloadManager {private List<DownloadInfo> downloadInfoList; // 下载列表private List<DownloadInfo> alreadyDownLoadList; // 已经下载完成的private List<DownloadInfo> downLoadingList; // 正在下载private int maxDownloadThread = 3; // 最大下载线程数private Context mContext;private DbUtils db;private long mLastTime;private long mLastFileSize;/* package */DownloadManager(Context appContext) {ColumnConverterFactory.registerColumnConverter(HttpHandler.State.class,new HttpHandlerStateConverter());mContext = appContext;db = DbUtils.create(mContext);alreadyDownLoadList = new ArrayList<DownloadInfo>();downLoadingList = new ArrayList<DownloadInfo>();try {downloadInfoList = db.findAll(Selector.from(DownloadInfo.class)); // 查询所有的下载} catch (DbException e) {LogUtils.e(e.getMessage(), e);}if (downloadInfoList == null) {downloadInfoList = new ArrayList<DownloadInfo>();} else {for (int i = 0; i < downloadInfoList.size(); i++) {if (downloadInfoList.get(i).getState().equals(com.lidroid.xutils.http.HttpHandler.State.SUCCESS)) {alreadyDownLoadList.add(downloadInfoList.get(i));} else {downLoadingList.add(downloadInfoList.get(i));}}}}public int getDownloadInfoListCount() {return downloadInfoList.size();}public DownloadInfo getDownloadInfo(int index) {return downloadInfoList.get(index);}public int getDownloadInfoLoadingCount() {return downLoadingList.size();}public List<DownloadInfo> getDownLoadingList() {return downLoadingList;}public DownloadInfo getDownLoadinginfo(int index) {downLoadingList.get(index);return downLoadingList.get(index);}public int getAlreadyDownLoadCount() {return alreadyDownLoadList.size();}public List<DownloadInfo> getAlreadyDownLoadList() {return alreadyDownLoadList;}public DownloadInfo getAlreadyDownLoadInfo(int index) {alreadyDownLoadList.get(index);return alreadyDownLoadList.get(index);}
/*** 获取当前url的文件是否在下载列表里，或去的时候想确保把改下载添加到了下载列表中* @param downloadUrl* @return*/public DownloadInfo  getDownLoadInfo(String  downloadUrl){DownloadInfo downloadInfo =null;for (DownloadInfo doInfo : downloadInfoList) {if (doInfo.getDownloadUrl().equals(downloadUrl)) {downloadInfo  =doInfo;return downloadInfo;}}return downloadInfo;}/*** 添加下载任务* * @param url*            下载链接* @param fileName*            文件名* @param target*            文件存放路径* @param autoResume* @param autoRename* @param callback*            回调* @throws DbException*/public void addNewDownload(String url, String fileName, String target,boolean autoResume, boolean autoRename,final RequestCallBack<File> callback) throws DbException {if (Utils.fileIsExists(target)) {// 下载文件已经存在不在添加下载任务} else {final DownloadInfo downloadInfo = new DownloadInfo();downloadInfo.setDownloadUrl(url);downloadInfo.setAutoRename(autoRename);downloadInfo.setAutoResume(autoResume);downloadInfo.setFileName(fileName);downloadInfo.setFileSavePath(target);HttpUtils http = new HttpUtils();http.configRequestThreadPoolSize(maxDownloadThread);HttpHandler<File> handler = http.download(url, target, autoResume,autoRename, new ManagerCallBack(downloadInfo, callback));downloadInfo.setHandler(handler);downloadInfo.setState(handler.getState());downloadInfoList.add(downloadInfo);db.saveBindingId(downloadInfo);}}public void resumeDownload(int index, final RequestCallBack<File> callback)throws DbException {final DownloadInfo downloadInfo = downloadInfoList.get(index);resumeDownload(downloadInfo, callback);}/*** 重新下载* * @param downloadInfo*            downLoadinfo信息* @param callback*            回调* @throws DbException*/public void resumeDownload(DownloadInfo downloadInfo,final RequestCallBack<File> callback) throws DbException {HttpUtils http = new HttpUtils();http.configRequestThreadPoolSize(maxDownloadThread);HttpHandler<File> handler = http.download(downloadInfo.getDownloadUrl(), downloadInfo.getFileSavePath(),downloadInfo.isAutoResume(), downloadInfo.isAutoRename(),new ManagerCallBack(downloadInfo, callback));downloadInfo.setHandler(handler);downloadInfo.setState(handler.getState());db.saveOrUpdate(downloadInfo);}/*** 移除下载任务* * @param index*            要移除的下表* @throws DbException*/public void removeDownload(int index) throws DbException {DownloadInfo downloadInfo = downloadInfoList.get(index);removeDownload(downloadInfo);}/*** 移除下载任务* * @param downloadInfo*            下载的downloadInfo对象* @throws DbException*/public void removeDownload(DownloadInfo downloadInfo) throws DbException {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null && !handler.isCancelled()) {handler.cancel();}downloadInfoList.remove(downloadInfo);downLoadingList.remove(downloadInfo);alreadyDownLoadList.remove(downloadInfo);db.delete(downloadInfo);}public void removeAlreadyDownLoad(DownloadInfo downloadInfo) throws DbException{HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null && !handler.isCancelled()) {handler.cancel();}alreadyDownLoadList.remove(downloadInfo);Utils.deleteFile(downloadInfo.getFileSavePath());db.delete(downloadInfo);}/*** 停止下载* * @param index*            下载的下表* @throws DbException*/public void stopDownload(int index) throws DbException {DownloadInfo downloadInfo = downloadInfoList.get(index);stopDownload(downloadInfo);}/*** 停止下载* * @param downloadInfo*            下载的downloadInfo对象* @throws DbException*/public void stopDownload(DownloadInfo downloadInfo) throws DbException {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null && !handler.isCancelled()) {handler.cancel();} else {downloadInfo.setState(HttpHandler.State.CANCELLED);}db.saveOrUpdate(downloadInfo);}/*** 停止所有的下载任务* * @throws DbException*/public void stopAllDownload() throws DbException {for (DownloadInfo downloadInfo : downloadInfoList) {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null && !handler.isCancelled()) {handler.cancel();} else {downloadInfo.setState(HttpHandler.State.CANCELLED);}}db.saveOrUpdateAll(downloadInfoList);}/*** 改变数据库中下载状态* * @throws DbException*/public void backupDownloadInfoList() throws DbException {for (DownloadInfo downloadInfo : downloadInfoList) {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null) {switch (handler.getState()) {case WAITING:downloadInfo.setState(State.CANCELLED);break;case SUCCESS:break;case FAILURE:break;case LOADING:downloadInfo.setState(State.CANCELLED);break;case CANCELLED:downloadInfo.setState(State.CANCELLED);break;case STARTED:downloadInfo.setState(State.CANCELLED);break;default:break;}}}db.saveOrUpdateAll(downloadInfoList);}public int getMaxDownloadThread() {return maxDownloadThread;}/*** 设置最大下载线程* * @param maxDownloadThread*/public void setMaxDownloadThread(int maxDownloadThread) {this.maxDownloadThread = maxDownloadThread;}public class ManagerCallBack extends RequestCallBack<File> {private DownloadInfo downloadInfo;private RequestCallBack<File> baseCallBack;public RequestCallBack<File> getBaseCallBack() {return baseCallBack;}public void setBaseCallBack(RequestCallBack<File> baseCallBack) {this.baseCallBack = baseCallBack;}private ManagerCallBack(DownloadInfo downloadInfo,RequestCallBack<File> baseCallBack) {this.baseCallBack = baseCallBack;this.downloadInfo = downloadInfo;}@Overridepublic Object getUserTag() {if (baseCallBack == null)return null;return baseCallBack.getUserTag();}@Overridepublic void setUserTag(Object userTag) {if (baseCallBack == null)return;baseCallBack.setUserTag(userTag);}@Overridepublic void onStart() {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null) {downloadInfo.setState(handler.getState());}try {db.saveOrUpdate(downloadInfo);if (downLoadingList.size() == 0) {downLoadingList.add(downloadInfo);}} catch (DbException e) {LogUtils.e(e.getMessage(), e);}if (baseCallBack != null) {baseCallBack.onStart();}}@Overridepublic void onCancelled() {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null) {downloadInfo.setState(handler.getState());}try {db.saveOrUpdate(downloadInfo);} catch (DbException e) {LogUtils.e(e.getMessage(), e);}if (baseCallBack != null) {baseCallBack.onCancelled();}}@Overridepublic void onLoading(long total, long current, boolean isUploading) {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null) {downloadInfo.setState(handler.getState());}long nowTime = System.currentTimeMillis();Log.e("SPEED1", nowTime + "");Log.e("SPEED2", mLastTime + "");Log.e("SPEED1_file", current + "");Log.e("SPEED2_file", mLastFileSize + "");float speed = 0;float speedContent = current - mLastFileSize;float speedTimer = nowTime - mLastTime;if (mLastTime > 0 && current != 0) {if (speedContent >= 1024) {speedContent = (float) ((speedContent) / (1024 + 0.0));speedContent = (float) (((int) (speedContent * 10) % 10 + 0.0) / 10 + (int) speedContent);speedTimer = (float) ((speedTimer) / (1000 + 0.0));speed = speedContent / speedTimer;}Log.e("SPEED", speed + "");}mLastTime = nowTime;mLastFileSize = current;downloadInfo.setSpeed(speed);downloadInfo.setFileLength(total);downloadInfo.setFileAllSize(((float) total) / ((float) 1048576));;downloadInfo.setProgress(current);try {db.saveOrUpdate(downloadInfo);} catch (DbException e) {LogUtils.e(e.getMessage(), e);}if (baseCallBack != null) {baseCallBack.onLoading(total, current, isUploading);}}@Overridepublic void onSuccess(ResponseInfo<File> responseInfo) {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null) {downloadInfo.setState(handler.getState());downLoadingList.remove(downloadInfo);alreadyDownLoadList.add(downloadInfo);}try {db.saveOrUpdate(downloadInfo);} catch (DbException e) {LogUtils.e(e.getMessage(), e);}if (baseCallBack != null) {baseCallBack.onSuccess(responseInfo);}}@Overridepublic void onFailure(HttpException error, String msg) {HttpHandler<File> handler = downloadInfo.getHandler();if (handler != null) {downloadInfo.setState(handler.getState());}try {db.saveOrUpdate(downloadInfo);} catch (DbException e) {LogUtils.e(e.getMessage(), e);}if (baseCallBack != null) {baseCallBack.onFailure(error, msg);}}}private class HttpHandlerStateConverter implementsColumnConverter<HttpHandler.State> {@Overridepublic HttpHandler.State getFieldValue(Cursor cursor, int index) {return HttpHandler.State.valueOf(cursor.getInt(index));}@Overridepublic HttpHandler.State getFieldValue(String fieldStringValue) {if (fieldStringValue == null)return null;return HttpHandler.State.valueOf(fieldStringValue);}@Overridepublic Object fieldValue2ColumnValue(HttpHandler.State fieldValue) {return fieldValue.value();}@Overridepublic ColumnDbType getColumnDbType() {return ColumnDbType.INTEGER;}}
}

DownLoadInfo

<span style="font-size:10px;">package cn.com.huahuawifi.android.guest.download;import com.lidroid.xutils.db.annotation.Transient;
import com.lidroid.xutils.http.HttpHandler;import java.io.File;public class DownloadInfo {public DownloadInfo() {}private long id;@Transientprivate HttpHandler<File> handler;private HttpHandler.State state;private String downloadUrl;private String fileName;private String fileSavePath;private long progress;      //下载的长度private long fileLength;   //文件的总长度private boolean autoResume;private boolean autoRename;     private float speed;private float fileAllSize;public float getFileAllSize() {return fileAllSize;}public void setFileAllSize(float fileAllSize) {this.fileAllSize = fileAllSize;}public float getSpeed() {return speed;}public void setSpeed(float speed) {this.speed = speed;}public long getId() {return id;}public void setId(long id) {this.id = id;}public HttpHandler<File> getHandler() {return handler;}public void setHandler(HttpHandler<File> handler) {this.handler = handler;}public HttpHandler.State getState() {return state;}public void setState(HttpHandler.State state) {this.state = state;}public String getDownloadUrl() {return downloadUrl;}public void setDownloadUrl(String downloadUrl) {this.downloadUrl = downloadUrl;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}public String getFileSavePath() {return fileSavePath;}public void setFileSavePath(String fileSavePath) {this.fileSavePath = fileSavePath;}public long getProgress() {return progress;}public void setProgress(long progress) {this.progress = progress;}public long getFileLength() {return fileLength;}public void setFileLength(long fileLength) {this.fileLength = fileLength;}public boolean isAutoResume() {return autoResume;}public void setAutoResume(boolean autoResume) {this.autoResume = autoResume;}public boolean isAutoRename() {return autoRename;}public void setAutoRename(boolean autoRename) {this.autoRename = autoRename;}@Overridepublic boolean equals(Object o) {if (this == o) return true;if (!(o instanceof DownloadInfo)) return false;DownloadInfo that = (DownloadInfo) o;if (id != that.id) return false;return true;}@Overridepublic int hashCode() {return (int) (id ^ (id >>> 32));}
}</span><span style="font-size:18px;font-weight: bold;">
</span>

下载的service

<span style="font-size:10px;">package cn.com.huahuawifi.android.guest.download;import android.app.ActivityManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import com.lidroid.xutils.exception.DbException;
import com.lidroid.xutils.util.LogUtils;import java.util.List;public class DownloadService extends Service {private static DownloadManager DOWNLOAD_MANAGER;public static DownloadManager getDownloadManager(Context appContext) {if (!DownloadService.isServiceRunning(appContext)) {Intent downloadSvr = new Intent("download.service.action");appContext.startService(downloadSvr);}if (DownloadService.DOWNLOAD_MANAGER == null) {DownloadService.DOWNLOAD_MANAGER = new DownloadManager(appContext);}return DOWNLOAD_MANAGER;}public DownloadService() {super();}@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {super.onCreate();}@Overridepublic void onStart(Intent intent, int startId) {super.onStart(intent, startId);}@Overridepublic void onDestroy() {if (DOWNLOAD_MANAGER != null) {try {DOWNLOAD_MANAGER.stopAllDownload();DOWNLOAD_MANAGER.backupDownloadInfoList();} catch (DbException e) {LogUtils.e(e.getMessage(), e);}}super.onDestroy();}public static boolean isServiceRunning(Context context) {boolean isRunning = false;ActivityManager activityManager =(ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);List<ActivityManager.RunningServiceInfo> serviceList= activityManager.getRunningServices(Integer.MAX_VALUE);if (serviceList == null || serviceList.size() == 0) {return false;}for (int i = 0; i < serviceList.size(); i++) {if (serviceList.get(i).service.getClassName().equals(DownloadService.class.getName())) {isRunning = true;break;}}return isRunning;}
}</span><span style="font-size:18px;font-weight: bold;">
</span>

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