Android使用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Titlerequest.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();        }    }}