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本篇文章為大家展示了怎么在Android中利用DownloadManager實現(xiàn)一個文件下載功能,內(nèi)容簡明扼要并且容易理解,絕對能使你眼前一亮,通過這篇文章的詳細(xì)介紹希望你能有所收獲。
Android中DownloadManager實現(xiàn)文件下載
創(chuàng)建下載鏈接
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
設(shè)置允許下載的網(wǎng)絡(luò)環(huán)境
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
WIFI網(wǎng)絡(luò) : DownloadManager.Request.NETWORK_WIFI
移動網(wǎng)絡(luò) : DownloadManager.Request.NETWORK_MOBILE
Notification顯示下載進度
// 在Notification顯示下載進度 request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE); // 設(shè)置Title request.setTitle("更新"); // 設(shè)置描述 request.setDescription("正在下載更新文件...");
設(shè)置保存路徑
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);
下載
下載會返回一個進程ID
DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE); long id = downloadManager.enqueue(request);
取消下載
通過ID可以需要下載
downloadManager.remove(id);
下載完成的監(jiān)聽
下載完成,系統(tǒng)會發(fā)出廣播,通過注冊廣播監(jiān)聽者可以監(jiān)聽到下載完成
廣播的Action為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
下載
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); // WIFI狀態(tài)下下載 request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI); // 設(shè)置通知欄 request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE); request.setTitle("更新"); request.setDescription("正在下載更新文件..."); // 存放路徑 request.setDestinationInExternalPublicDir(DIR, APK); // 開始下載 DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE); long id = downloadManager.enqueue(request);
廣播接收者
注冊
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.kongqingwei.downloadmanagerdemo"> <!-- 網(wǎng)絡(luò)權(quán)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>
實現(xiàn)
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. * 廣播接收者 */ public class AutoUpdateBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(intent.getAction())) { Toast.makeText(context, "下載完成", Toast.LENGTH_SHORT).show(); boolean isInstalled = AutoUpdater.installApk(); Toast.makeText(context, isInstalled ? "安裝成功" : "安裝失敗", Toast.LENGTH_SHORT).show(); } } }
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