本篇文章为大家展示了怎么在Android中利用DownloadManager实现一个文件下载功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
Android中DownloadManager实现文件下载
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
@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;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(); } }}上述内容就是怎么在Android中利用DownloadManager实现一个文件下载功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注编程网行业资讯频道。
