Android中DownloadManager实现文件下载实例详解

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));

request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);

// 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...");

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);

DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);long id = downloadManager.enqueue(request);

downloadManager.remove(id);

/** * 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";

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);

<?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>

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();  } }}