Android开发 DownloadManager详解

前言

　　此博客正在整理中。。。

　　参考：https://www.jianshu.com/p/e0496200769c

代码

请求

注意 setDestinationInExternalPublicDir方法已经包含根目录路径了，所以直接传入DIRECTORY_DOWNLOADS就可以了，千万不要在导入一个 Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath() 这样他会自动在创建多层目录

                DownloadManager downloadManager = (DownloadManager) MainActivity.this.getApplication().getSystemService(Context.DOWNLOAD_SERVICE);
                DownloadManager.Request request = new DownloadManager.Request(Uri.parse("https://dl.hdslb.com/mobile/latest/iBiliPlayer-html5_app_bili.apk"));
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "iBiliPlayer-html5_app_bili.apk");
                request.setTitle("测试下载");//设置标题
                request.setDescription("下载中");//设置描述
                request.addRequestHeader("token","11");//添加头 key： value
                request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);//设置网络类型
                request.setVisibleInDownloadsUi(false);//是否显示下载 从Android Q开始会被忽略
//                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);//仅在下载中时显示在通知中,完成后会自动隐藏
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);//下载中与下载完成后都会在通知中显示
                id = downloadManager.enqueue(request);//加入队列，会返回一个唯一下载id

查询

private void queryFileName(long id){
        DownloadManager downloadManager = (DownloadManager) MainActivity.this.getApplication().getSystemService(Context.DOWNLOAD_SERVICE);
        DownloadManager.Query query = new DownloadManager.Query();
        query.setFilterById(id);
        Cursor cursor = downloadManager.query(query);
        if (cursor.moveToFirst()) {
            String file = cursor.getString(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_LOCAL_URI));
            Log.e("调试_临时_log", "this_" + file);
        }
    }

监听

                AppDownReceiver appDownReceiver = new AppDownReceiver();
                registerReceiver(appDownReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

class AppDownReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        long completeDownloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
        Log.e("调试_临时_log", "this_ id = " + completeDownloadId);
        DownloadManager downloadManager = (DownloadManager) context.getApplicationContext().getSystemService(Context.DOWNLOAD_SERVICE);
        Uri uri = downloadManager.getUriForDownloadedFile(completeDownloadId);
        installApk(context, uri);

    }

    private void installApk(Context context, Uri uri) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(uri, "application/vnd.android.package-archive");
        } else {
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setDataAndType(uri, "application/vnd.android.package-archive");

        }
        context.startActivity(intent);
    }
}

    /**
     * 获取下载状态
     *
     * @param downloadId an ID for the download, unique across the system.
     *                   This ID is used to make future calls related to this download.
     * @return int
     * @see DownloadManager#STATUS_PENDING
     * @see DownloadManager#STATUS_PAUSED
     * @see DownloadManager#STATUS_RUNNING
     * @see DownloadManager#STATUS_SUCCESSFUL
     * @see DownloadManager#STATUS_FAILED
     */
    public int getDownloadStatus(long downloadId) {
        DownloadManager.Query query = new DownloadManager.Query().setFilterById(downloadId);
        Cursor c = downloadManager.query(query);
        if (c != null) {
            try {
                if (c.moveToFirst()) {
                    return c.getInt(c.getColumnIndexOrThrow(DownloadManager.COLUMN_STATUS));
                }
            } finally {
                c.close();
            }
        }
        return -1;
    }

END