版本更新

首先呢，我们是应该在用户登录后，在首页执行检查版本信息的操作，具体是，获取到本地的版本号后，提交给服务器进行判断，然后后台来告诉我们当前版本是否为最新版本，紧接着我们拿到下载地址，执行下载的操作，具体的可以使用输入输出流来对文件进行存储和读取，最后我们将下载好的文件，调用系统的安装界面，进行安装，自此我们的更新操作全部完成。

首先记得添加权限

<code class="hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">uses-permission</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.permission.INTERNET"</span>/></span>
    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">uses-permission</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.permission.WRITE_EXTERNAL_STORAGE"</span>/></span>
    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">uses-permission</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.permission.MOUNT_UNMOUNT_FILESYSTEMS"</span>/></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"></ul>

布局比较简单，就是一个下载按钮（忽略）：

广播动态注册：

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
getActivity().registerReceiver(receiver, intentFilter);

按钮点击事件

/**创建request对象*/
DownloadManager.Request request = new DownloadManager.Request(Uri.parse("http://dingphone.ufile.ucloud.com.cn/apk/guanwang/time2plato.apk"));
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_ONLY_COMPLETION);
request.setTitle("apk下载");
request.setDescription("我的app正在下载");
request.setAllowedOverMetered(false);//不允许漫游
request.allowScanningByMediaScanner();
//创建下载文件目录
request.setDestinationInExternalFilesDir(getContext(), Environment.DIRECTORY_DOWNLOADS, "my.apk");
manger = (DownloadManager) getActivity().getSystemService(Context.DOWNLOAD_SERVICE);
manger.enqueue(request);
//manager.remove(id);//下载任务和已经下载的文件同时删除

广播接收者

class DownLoadCompleteReceiver extends BroadcastReceiver {
    /**
     * 取得系统服务后，调用downloadmanager对象的enqueue方法进行下载，此方法返回一个编号用于标示此下载任务
     */
    @Override
    public void onReceive(Context context, Intent intent) {
        int id = (int) intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
        DownloadManager.Query query = new DownloadManager.Query();
        query.setFilterById(id);
        Cursor cursor = manger.query(query);

        if (cursor != null) {
            cursor.moveToNext();
            String path = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            install.setDataAndType(Uri.fromFile(new File(path)), "application/vnd.android.package-archive");
            startActivity(install);
        }

    }