Android app强更解决方案。

之前笔者项目有个强更的需求，后来发现渠道sdk都有这个功能，就废弃掉了，但好歹自己查了好多资料调试了些时间才出的劳动成功，直接扔了不管有些可惜，所以放上来，有需要的同学可以拿来直接使用。

当打开app时用http和服务器进行一次通信，比较客户端和服务器端的版本号，如果不需要更新则开始游戏（笔者的项目是一个Unity3d的游戏项目），否则服务器返回新apk的下载地址，调用更新逻辑，即调用下面的UpdateNewVersion的downNewApk方法开始下载。

package com.kugou.wushen;import android.app.DownloadManager;import android.app.ProgressDialog;import android.content.Context;import android.content.SharedPreferences;import android.database.ContentObserver;import android.database.Cursor;import android.net.Uri;import android.os.Environment;import android.os.Handler;import android.util.Log;public class UpdateNewVersion {private Handler handler;private Context context;private ProgressDialog mProgress;private long refernece;public static final Uri CONTENT_URI = Uri.parse("content://downloads/my_downloads");public UpdateNewVersion(Context _context,Handler _handler){this.context = _context;this.handler = _handler;}public void downNewApk(String url){DownloadManager dManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);Uri uri = Uri.parse(url);DownloadManager.Request request = new DownloadManager.Request(uri);// 设置下载路径和文件名int idx = url.lastIndexOf("/");String apkName = url.substring(idx+1);request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, apkName);request.setDescription("舞神新版本下载");request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);request.setMimeType("application/vnd.android.package-archive");// 设置为可被媒体扫描器找到request.allowScanningByMediaScanner();// 设置为可见和可管理request.setVisibleInDownloadsUi(true);refernece = dManager.enqueue(request);// 把当前下载的ID保存起来SharedPreferences sPreferences = context.getSharedPreferences("downloadcomplete", 0);sPreferences.edit().putLong("refernece", refernece).commit();DownloadChangeObserver observer = new DownloadChangeObserver(handler);context.getContentResolver().registerContentObserver(CONTENT_URI, true, observer);}//用于显示下载进度class DownloadChangeObserver extends ContentObserver{public DownloadChangeObserver(Handler handler) {super(handler);}@Overridepublic void onChange(boolean selfChange){DownloadManager.Query query = new DownloadManager.Query();query.setFilterById(refernece);DownloadManager dManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);final Cursor cursor = dManager.query(query);if(cursor != null && cursor.moveToFirst()){final int fileSizeIdx = cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES);final int bytesDLIdx = cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR);handler.post(new Runnable() {        public void run() {        Log.i("text", ""+cursor.getInt(bytesDLIdx)+"/"+cursor.getInt(fileSizeIdx));        UpdateDownloadProgress(cursor.getInt(bytesDLIdx),cursor.getInt(fileSizeIdx));        }});}}}private void UpdateDownloadProgress(int cur, int total){if(mProgress == null){mProgress = new ProgressDialog(context);      mProgress.setIcon(R.drawable.app_icon);      mProgress.setTitle("舞神更新。。。");      mProgress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);     mProgress.setCancelable(false);    mProgress.setCanceledOnTouchOutside(false);    mProgress.setProgressNumberFormat("%dM/%dM");    mProgress.show();}mProgress.setMax(total/1024/1024);mProgress.setProgress(cur/1024/1024);}}

当下载完成时需要打开安装界面，需要一个BroadcastReceiver侦听下载完成事件

package com.kugou.wushen;import android.app.DownloadManager;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.net.Uri;public class UpdataBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {long myDwonloadID = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);SharedPreferences sPreferences = context.getSharedPreferences("downloadcomplete", 0);long refernece = sPreferences.getLong("refernece", 0);if (refernece == myDwonloadID) {String serviceString = Context.DOWNLOAD_SERVICE;DownloadManager dManager = (DownloadManager) context.getSystemService(serviceString);Intent install = new Intent(Intent.ACTION_VIEW);Uri downloadFileUri = dManager.getUriForDownloadedFile(myDwonloadID);install.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(install);}}}

 

将UpdataBroadcastReceiver注册到AndroidManifest.xml中，如下：

<receiver            android:name="com.DWhale.god.UpdataBroadcastReceiver">            <intent-filter>                <action android:name="android.intent.action.DOWNLOAD_COMPLETE" />            </intent-filter>        </receiver>

并在AndroidManifest.xml中添加响应的权限

< uses-permission android:name = "android.permission.RECEIVE_SMS" />< uses-permission android:name = "android.permission.SEND_SMS" />

这样即使关闭了app，也能收到下载完成的广播，打开安装界面。

注：本文代码主要参考了 使用Android系统提供的DownloadManager来下载文件 ，对原作者表示感谢！