DownloadUtil

在apk版本升级的时候以前都是起一个service然后处理，偶然发现这个DownloadManager
网上百度了一下学习下
参考学习资料

http://www.jianshu.com/p/6816977bfdeb

单位项目中的工具类，感觉写的不好，先马克在这

public class DownloadUtil {    private DownloadManager mDownloadManager;    private Context mContext;    private long downloadId;    public DownloadUtil(Context context) {        mContext = context;    }    public void download(String url) {        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 {            DownloadManager manager = (DownloadManager) mContext                    .getSystemService(Context.DOWNLOAD_SERVICE);            DownloadManager.Request request = new DownloadManager.Request(                    Uri.parse(url));            request.setTitle("丫丫学车下载中...");            request.setDescription("");            request.allowScanningByMediaScanner();// 设置可以被扫描到            request.setVisibleInDownloadsUi(true);// 设置下载可见            String fileName = url.substring(url.lastIndexOf("/"));// 解析fileName            request.setDestinationInExternalPublicDir(                    Environment.DIRECTORY_DOWNLOADS, fileName);// 设置下载位置，sdcard/Download/fileName            long refernece = manager.enqueue(request);// 加入下载并取得下载ID            SharedPreferences sPreferences = mContext                    .getSharedPreferences("downloadplato", 0);            sPreferences.edit().putLong("plato", refernece).commit();//保存此次下载ID        }    }//    private BroadcastReceiver mReceiver = new BroadcastReceiver() {//        @Override//        public void onReceive(Context context, Intent intent) {//            checkStatus();//        }//    };    /**     * 检查下载状态     *///    private void checkStatus() {//        mContext.unregisterReceiver(mReceiver);//        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://                    File apkFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "yayaxueche.apk");//                    PackageUtil.installAPK(mContext,apkFile);//                    break;//                //下载失败//                case DownloadManager.STATUS_FAILED://                    Toast.makeText(mContext, R.string.DownLoadErr, Toast.LENGTH_SHORT).show();//                    break;//            }//        }//        cursor.close();//    }}

调用方式

DownloadUtil downloadUtil = new DownloadUtil(MainActivity.this);                                downloadUtil.download(HttpUrlConstants.SERVER_RESOUSE_URL + url);

感觉还是

http://www.jianshu.com/p/6816977bfdeb

这个链接里边写的比较好一点
感觉downLoadManager不是很还用，不如起一个service

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学习资料
http://www.jianshu.com/p/2c57efe49ef2

https://github.com/shuhaoSCode/AndroidUpdate