Android中DownloadManager实现文件下载实例详解

android中downloadmanager实现文件下载

下载

创建下载链接

downloadmanager.request request = new downloadmanager.request(uri.parse(url));

设置允许下载的网络环境

request.setallowednetworktypes(downloadmanager.request.network_wifi);

wifi网络 : downloadmanager.request.network_wifi

移动网络 : downloadmanager.request.network_mobile

notification显示下载进度

// 在notification显示下载进度
request.setnotificationvisibility(downloadmanager.request.visibility_visible);
// 设置title
request.settitle("更新");
// 设置描述
request.setdescription("正在下载更新文件...");

设置保存路径

private static final string dir = "autoupdate";
private static final string apk = "myhome.apk";
private static final string path = environment.getexternalstoragedirectory().getabsolutepath() + "/" + dir + "/" + apk;

request.setdestinationinexternalpublicdir(dir, apk);

下载

下载会返回一个进程id

downloadmanager downloadmanager = (downloadmanager) context.getsystemservice(context.download_service);
long id = downloadmanager.enqueue(request);

取消下载

通过id可以需要下载

downloadmanager.remove(id);

下载完成的监听

下载完成，系统会发出广播，通过注册广播监听者可以监听到下载完成

广播的action为downloadmanager.action_download_complete

/**
 * broadcast intent action sent by the download manager when the user clicks on a running
 * download, either from a system notification or from the downloads ui.
 */
@sdkconstant(sdkconstanttype.broadcast_intent_action)
public final static string action_notification_clicked =
  "android.intent.action.download_notification_clicked";

code

下载

downloadmanager.request request = new downloadmanager.request(uri.parse(url));
// wifi状态下下载
request.setallowednetworktypes(downloadmanager.request.network_wifi);
// 设置通知栏
request.setnotificationvisibility(downloadmanager.request.visibility_visible);
request.settitle("更新");
request.setdescription("正在下载更新文件...");
// 存放路径
request.setdestinationinexternalpublicdir(dir, apk);

// 开始下载
downloadmanager downloadmanager = (downloadmanager) context.getsystemservice(context.download_service);
long id = downloadmanager.enqueue(request);

广播接收者

注册

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.kongqingwei.downloadmanagerdemo">

 <!-- 网络权限 -->
 <uses-permission android:name="android.permission.internet"/>
 <uses-permission android:name="android.permission.read_external_storage"/>
 <uses-permission android:name="android.permission.write_external_storage"/>

 <uses-permission android:name="android.permission.manage_users"/>

 <application
  android:allowbackup="true"
  android:icon="@mipmap/ic_launcher"
  android:label="@string/app_name"
  android:supportsrtl="true"
  android:theme="@style/apptheme">
  <activity android:name=".mainactivity">
   <intent-filter>
    <action android:name="android.intent.action.main"/>

    <category android:name="android.intent.category.launcher"/>
   </intent-filter>

  </activity>

  <receiver android:name=".autoupdatebroadcastreceiver">
   <intent-filter>
    <action android:name="android.intent.action.download_complete"/>
   </intent-filter>
  </receiver>
 </application>

</manifest>

实现

package com.example.kongqingwei.downloadmanagerdemo;

import android.app.downloadmanager;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.widget.toast;

/**
 * created by kongqingwei on 2016/12/19.
 * 广播接收者
 */
public class autoupdatebroadcastreceiver extends broadcastreceiver {
 @override
 public void onreceive(context context, intent intent) {
  if (downloadmanager.action_download_complete.equals(intent.getaction())) {
   toast.maketext(context, "下载完成", toast.length_short).show();
   boolean isinstalled = autoupdater.installapk();
   toast.maketext(context, isinstalled ? "安装成功" : "安装失败", toast.length_short).show();
  }
 }
}

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