Android(安卓)- DownloadManager的使用

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DownloadManager是Android的基础类, 用于下载文件, 完成自动更新的功能.
使用方式

DownloadUtil downloadUtil = new DownloadUtil(context);downloadUtil.download();

代码

package me.chunyu.model.utils;import android.annotation.TargetApi;import android.app.DownloadManager;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.net.Uri;import android.webkit.MimeTypeMap;/** * 下载类, 默认下载春雨医生APK, 也可以下载其他APK. * 存储位置: /sdcard/download/filename *  * Created by C.L.Wang on 15/7/27. */@TargetApi(11)public class DownloadUtil {    private static final String CHUNYU_DOWNLOAD_URL =            "http://www.chunyuyisheng.com/download/chunyu/latest/";    private static final String APK_TYPE =            "application/vnd.android.package-archive";    private static final String DEFAULT_FILE_NAME = "chunyudoctor.apk";    private static final String DEFAULT_TITLE = "春雨医生";    private Context mContext; // 下载进行    private String mUrl; // URL地址    private String mFileName; // 文件名    private String mTitle; // 通知栏标题    private DownloadManager mDownloadManager; // 下载管理器    private long mDownloadId; // 下载ID    // 下载完成的接收器    private BroadcastReceiver mReceiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);            if (downloadId == mDownloadId) {                installApp(mDownloadId);                destroyArgs();            }        }    };    /**     * 默认构造器, 下载春雨医生APK     *     * @param context 上下文     */    public DownloadUtil(Context context) {        this(context, CHUNYU_DOWNLOAD_URL, DEFAULT_FILE_NAME, DEFAULT_TITLE);    }    /**     * 参数构造器, 下载其他文件     *     * @param context  活动     * @param url      URL     * @param fileName 存储文件名     * @param title    通知栏标题     */    public DownloadUtil(Context context, String url, String fileName, String title) {        mContext = context;        mUrl = url;        mFileName = fileName;        mTitle = title;        initArgs();    }    /**     * 下载文件     */    public void download() {        // 设置下载Url        Uri resource = Uri.parse(mUrl);        DownloadManager.Request request = new DownloadManager.Request(resource);        // 设置文件类型        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();        String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(mUrl));        request.setMimeType(mimeString);        // 下载完成时在进度条提示        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);        // 存储sdcard目录的download文件夹        request.setDestinationInExternalPublicDir("/download/", mFileName);        request.setTitle(mTitle);        // 开始下载        mDownloadId = mDownloadManager.enqueue(request);    }    // 初始化    private void initArgs() {        mDownloadManager = (DownloadManager) mContext.getSystemService((Context.DOWNLOAD_SERVICE));        mContext.registerReceiver(mReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));    }    // 析构    private void destroyArgs() {        mContext.unregisterReceiver(mReceiver);    }    // 安装App    private void installApp(long downloadId) {        Intent install = new Intent(Intent.ACTION_VIEW);        Uri downloadFileUri = mDownloadManager.getUriForDownloadedFile(downloadId);        install.setDataAndType(downloadFileUri, APK_TYPE);        install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        mContext.startActivity(install);    }}

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