使用DownloadManager进行版本更新（兼容7.0）

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概述

DownloadManager是Android SDK中封装的下载文件类，可以很方便开发者使用下载文件。其具体看官方APIhttps://developer.android.com/reference/android/app/DownloadManager.html

正文

使用DownloadManager下载

public class DownloadUtils { private DownloadManager mDownloadManager; private Context mContext; private long downloadId; private String apkName; public DownloadUtils(Context context) {     mContext = context; } public void download(String url, String name) {     final String packageName = "com.android.providers.downloads";     int state = mContext.getPackageManager().getApplicationEnabledSetting(packageName);     //检测下载管理器是否被禁用     if (state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED         || state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER         || state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED) {         AlertDialog.Builder builder = new AlertDialog.Builder(mContext).setTitle("温馨提示").setMessage             ("系统下载管理器被禁止，需手动打开").setPositiveButton("确定", new DialogInterface.OnClickListener() {             @Override             public void onClick(DialogInterface dialog, int which) {                 dialog.dismiss();                 try {                     Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);                     intent.setData(Uri.parse("package:" + packageName));                     mContext.startActivity(intent);                 } catch (ActivityNotFoundException e) {                     Intent intent = new Intent(Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);                     mContext.startActivity(intent);                 }             }         }).setNegativeButton("取消", new DialogInterface.OnClickListener() {             @Override             public void onClick(DialogInterface dialog, int which) {                 dialog.dismiss();             }         });         builder.create().show();     } else {         //正常下载流程         apkName = name;         DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));         request.setAllowedOverRoaming(false);         //通知栏显示         request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);         request.setTitle(AppUtils.getAppName(mContext));         request.setDescription("正在下载中...");         request.setVisibleInDownloadsUi(true);         //设置下载的路径         request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, apkName);         //获取DownloadManager         mDownloadManager = (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);         downloadId = mDownloadManager.enqueue(request);         mContext.registerReceiver(mReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));     } } private BroadcastReceiver mReceiver = new BroadcastReceiver() {     @Override     public void onReceive(Context context, Intent intent) {         checkStatus();     } }; /**  * 检查下载状态  */ private void checkStatus() {     DownloadManager.Query query = new DownloadManager.Query();     query.setFilterById(downloadId);     Cursor cursor = mDownloadManager.query(query);     if (cursor.moveToFirst()) {         int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));         switch (status) {             //下载暂停             case DownloadManager.STATUS_PAUSED:                 break;             //下载延迟             case DownloadManager.STATUS_PENDING:                 break;             //正在下载             case DownloadManager.STATUS_RUNNING:                 break;             //下载完成             case DownloadManager.STATUS_SUCCESSFUL:                 installAPK();                 break;             //下载失败             case DownloadManager.STATUS_FAILED:                 Toast.makeText(mContext, "下载失败", Toast.LENGTH_SHORT).show();                 break;         }     }     cursor.close(); } /**  * 7.0兼容  */ private void installAPK() {     File apkFile =         new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), apkName);     Intent intent = new Intent(Intent.ACTION_VIEW);     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {         Uri apkUri = FileProvider.getUriForFile(mContext, mContext.getPackageName() + ".provider", apkFile);         intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);         intent.setDataAndType(apkUri, "application/vnd.android.package-archive");     } else {         intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");     }     mContext.startActivity(intent); }}

在Manifest中添加使用权限

<uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

在Manifest中添加7.0私有文件权限

<provider android:name="android.support.v4.content.FileProvider" android:authorities="${applicationId}.provider" android:exported="false" android:grantUriPermissions="true"> <meta-data     android:name="android.support.FILE_PROVIDER_PATHS"     android:resource="@xml/provider_paths"/></provider>

建立xml私有文件权限配置
在res中建立xml文件夹，建立provider_paths.xml文件，文件中：

<?xml version="1.0" encoding="utf-8"?><resources xmlns:android="http://schemas.android.com/apk/res/android"> <paths>     <external-path         name="download"         path=""/> </paths></resources>

后记

已兼容7.0私有文件权限问题
对于部分机型默认或者一些原因，下载管理器是被禁用掉的，必须手动开启或者写代码去跳转到设置界面开启，代码中已兼容。

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