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huangzhuanghua
253
app/src/main/java/com/gh/download/DownloadManager.java
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253
app/src/main/java/com/gh/download/DownloadManager.java
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package com.gh.download;
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import java.io.File;
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import java.util.List;
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import java.util.Map.Entry;
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import android.content.Context;
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import android.content.Intent;
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import android.widget.Toast;
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import com.gh.common.constant.Constants;
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import com.gh.common.util.FileUtils;
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import com.gh.common.util.Trace;
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public class DownloadManager {
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private static DownloadManager mInstance;
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private Context context;
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private DownloadManager(Context context) {
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this.context = context;
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context.startService(new Intent(context, DownloadService.class));
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}
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public static DownloadManager getInstance(Context context) {
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if (mInstance == null) {
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mInstance = new DownloadManager(context.getApplicationContext());
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}
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return mInstance;
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}
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private Intent getIntent(DownloadEntry entry, DownloadStatus status) {
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Intent service = new Intent(context, DownloadService.class);
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service.putExtra(Constants.KEY_DOWNLOAD_ENTRY, entry);
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service.putExtra(Constants.KEY_DOWNLOAD_ACTION, status.name());
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return service;
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}
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/**
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* 根据url到本地sqlite数据库中查找并获取该文件的保存路径， 并检查改路径下文件是否存在,不存在则删除该条无效记录
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*
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* @param url
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* 下载任务的标识url
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*/
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private boolean checkDownloadEntryRecordValidate(String url) {
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DownloadEntry entry = get(url);
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if (entry != null) {
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File file = new File(entry.getPath());
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if (!file.exists()) {
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DownloadDao.getInstance(context).delete(url);
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Trace.getInstance().debug(
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DownloadManager.class.getSimpleName(),
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"文件不存在,删除该条无效数据库记录!");
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return true;
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}
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}
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return false;
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}
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/**
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* 检查任务是否已经下载完成
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*
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* @param url
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* @return
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*/
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public boolean isFileCompleted(String url) {
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DownloadEntry entry = get(url);
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if (entry != null) {
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if (entry.getPercent() == 100) {
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Trace.getInstance().debug(
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DownloadManager.class.getSimpleName(), "文件已经下载完成!");
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return true;
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}
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}
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return false;
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}
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public boolean isTaskDownloading(String url) {
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if (DataChanger.getInstance().getDownloadingTasks().get(url) != null) {
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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url + "正在下载!");
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return true;
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}
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return false;
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}
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/**
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* 添加一个下载任务
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*
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* @param entry
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*/
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public void add(DownloadEntry entry) {
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if (entry != null) {
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String url = entry.getUrl();
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checkDownloadEntryRecordValidate(url);
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if (!isFileCompleted(url) && !isTaskDownloading(url)) {
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context.startService(getIntent(entry, DownloadStatus.add));
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}
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}
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(), "add");
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}
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/**
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* 根据任务url暂停下载
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*
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* @param url
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*/
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public void pause(String url) {
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checkDownloadEntryRecordValidate(url);
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DownloadEntry entry = DataChanger.getInstance().getDownloadEntries()
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.get(url);
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if (entry != null) {
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context.startService(getIntent(entry, DownloadStatus.pause));
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}
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"pause");
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}
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/**
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* 根据url恢复下载
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*
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* @param url
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*/
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public void resume(String url) {
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DownloadEntry entry = get(url);
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// 暂停任务后，把文件删除，然后点继续，文件不存在，需要重新加入下载队列进行下载
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if (checkDownloadEntryRecordValidate(url)) {
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Toast.makeText(context, "文件不存在！已重新加入下载队列", Toast.LENGTH_SHORT)
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.show();
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add(entry);
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} else {
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if (entry != null) {
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if (!isFileCompleted(url) && !isTaskDownloading(url)) {
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context.startService(getIntent(entry, DownloadStatus.resume));
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}
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}
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}
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"resume");
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}
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/**
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* 根据url取消下载，并删除已下载的文件
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*
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* @param id
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*/
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public void cancel(String url) {
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cancel(url, true);
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}
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public void cancel(String url, boolean isDeleteFile) {
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DownloadEntry temp = DownloadDao.getInstance(context).get(url);
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if (temp != null) {
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if (isDeleteFile) {
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FileUtils.deleteFile(temp.getPath());
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}
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DownloadDao.getInstance(context).delete(url);
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"cancle==>file and record were deleted!");
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}
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DownloadEntry entry = DataChanger.getInstance().getDownloadEntries()
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.get(url);
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if (entry != null) {
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context.startService(getIntent(entry, DownloadStatus.cancel));
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"cancel");
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}
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}
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/**
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* 取消并删除所有下载任务(包括下载中、等待、暂停状态的任务)
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*/
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public void cancleAll() {
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for (Entry<String, DownloadEntry> entry : DataChanger.getInstance()
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.getDownloadEntries().entrySet()) {
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cancel(entry.getValue().getUrl(), true);
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}
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"cancel all");
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}
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/**
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* 开始所有下载任务
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*/
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public void startAll() {
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for (Entry<String, DownloadEntry> entry : DataChanger.getInstance()
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.getDownloadEntries().entrySet()) {
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add(entry.getValue());
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}
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"start all");
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}
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/**
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* 暂停所有正在下载的任务
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*/
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public void pauseAll() {
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for (Entry<String, DownloadEntry> entry : DataChanger.getInstance()
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.getDownloadEntries().entrySet()) {
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if (entry.getValue().getStatus() == DownloadStatus.downloading) {
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pause(entry.getValue().getUrl());
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}
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}
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"pause all");
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}
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/**
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* 根据url获取某一个下载任务
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*
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* @param url
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* @return null表示下载列表中不存在该任务，否则返回下载任务
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*/
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public DownloadEntry get(String url) {
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return DownloadDao.getInstance(context).get(url);
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}
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/**
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* 获取所有下载列表中的任务
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*
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* @return null表示没有下载任务
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*/
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public List<DownloadEntry> getAll() {
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"getAll");
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return DownloadDao.getInstance(context).getAll();
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}
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public void addObserver(DataWatcher dataWatcher) {
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DataChanger.getInstance().addObserver(dataWatcher);
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"addObserver");
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}
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public void removeObserver(DataWatcher dataWatcher) {
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DataChanger.getInstance().deleteObserver(dataWatcher);
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"removeObserver");
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}
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public void removeObservers() {
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DataChanger.getInstance().deleteObservers();
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Trace.getInstance().debug(DownloadManager.class.getSimpleName(),
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"removeObservers");
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}
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}
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