Android 使用 DowanloadManager 实现下载并获取下载进度实例代码

android 使用 dowanloadmanager 实现下载并获取下载进度实例代码

实现代码：

package com.koolsee.gallery;
 
import java.util.arraylist;
import java.util.list;
import java.util.timer;
import java.util.timertask;
 
import android.app.activity;
import android.app.downloadmanager;
import android.app.downloadmanager.request;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import android.database.contentobserver;
import android.database.cursor;
import android.net.uri;
import android.os.bundle;
import android.os.environment;
import android.os.handler;
import android.util.log;
import android.view.keyevent;
import android.view.motionevent;
import android.view.view;
import android.view.view.onkeylistener;
import android.view.view.ontouchlistener;
import android.widget.adapterview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.adapterview.onitemselectedlistener;
import android.widget.button;
import android.widget.imageview;
import android.widget.textview;
 
import com.koolsee.gallery.adapter.recommendadapter;
import com.koolsee.gallery.model.recommend;
import com.koolsee.gallery.widget.galleryflow;
 
/**
 * 首页
 *
 * @author zengxiaotao
 */
public class testactivity extends activity {
 private downloadmanager dowanloadmanager = null;
 private downloadchangeobserver downloadobserver;
 private long lastdownloadid = 0;
 public static final uri content_uri = uri.parse("content://downloads/my_downloads");
 @override
 protected void oncreate(bundle savedinstancestate) {
  // todo auto-generated method stub
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.test);
  string servicestring = context.download_service;
  dowanloadmanager = (downloadmanager) getsystemservice(download_service);
 
  uri uri = uri.parse("http://commonsware.com/misc/test.mp4");
  environment.getexternalstoragepublicdirectory(
   environment.directory_downloads).mkdir();
 
  lastdownloadid = dowanloadmanager.enqueue(new downloadmanager.request(uri)
           .setallowednetworktypes(
            downloadmanager.request.network_mobile
            | downloadmanager.request.network_wifi)
           .setallowedoverroaming(false)
           .setdestinationinexternalpublicdir(
            environment.directory_downloads, "test.mp4"));
  registerreceiver(receiver, new intentfilter(downloadmanager.action_download_complete));
  downloadobserver = new downloadchangeobserver(null);
  getcontentresolver().registercontentobserver(content_uri, true, downloadobserver);
 }
 class downloadchangeobserver extends contentobserver {
 
  public downloadchangeobserver(handler handler) {
   super(handler);
   // todo auto-generated constructor stub
  }
 
  @override
  public void onchange(boolean selfchange) {
   querydownloadstatus();
  }
 }
  
 private broadcastreceiver receiver = new broadcastreceiver() {
  @override
  public void onreceive(context context, intent intent) {
   //这里可以取得下载的id，这样就可以知道哪个文件下载完成了。适用与多个下载任务的监听
   log.v("tag", "" + intent.getlongextra(downloadmanager.extra_download_id, 0));
   querydownloadstatus();
  }
 };
 
 private void querydownloadstatus() {
  downloadmanager.query query = new downloadmanager.query();
  query.setfilterbyid(lastdownloadid);
  cursor c = dowanloadmanager.query(query);
  if(c != null && c.movetofirst()) {
   int status = c.getint(c.getcolumnindex(downloadmanager.column_status));
 
   int reasonidx = c.getcolumnindex(downloadmanager.column_reason);
   int titleidx = c.getcolumnindex(downloadmanager.column_title);
   int filesizeidx =
    c.getcolumnindex(downloadmanager.column_total_size_bytes);
   int bytesdlidx =
    c.getcolumnindex(downloadmanager.column_bytes_downloaded_so_far);
   string title = c.getstring(titleidx);
   int filesize = c.getint(filesizeidx);
   int bytesdl = c.getint(bytesdlidx);
 
   // translate the pause reason to friendly text.
   int reason = c.getint(reasonidx);
   stringbuilder sb = new stringbuilder();
   sb.append(title).append("\n");
   sb.append("downloaded ").append(bytesdl).append(" / " ).append(filesize);
 
   // display the status
   log.d("tag", sb.tostring());
   switch(status) {
   case downloadmanager.status_paused:
    log.v("tag", "status_paused");
   case downloadmanager.status_pending:
    log.v("tag", "status_pending");
   case downloadmanager.status_running:
    // 正在下载，不做任何事情
    log.v("tag", "status_running");
    break;
   case downloadmanager.status_successful:
    // 完成
    log.v("tag", "下载完成");
    // dowanloadmanager.remove(lastdownloadid);
    break;
   case downloadmanager.status_failed:
    // 清除已下载的内容，重新下载
    log.v("tag", "status_failed");
    dowanloadmanager.remove(lastdownloadid);
    break;
   }
  }
 }
 
 @override
 protected void ondestroy() {
  // todo auto-generated method stub
  super.ondestroy();
  unregisterreceiver(receiver);
  getcontentresolver().unregistercontentobserver(downloadobserver);
 }
}

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！