判断系统是否支持 DownloadManager服务

public static boolean isDownloadManagerAvailable(Context context)

{

try

{

Log.d("Download", "Build.VERSION.SDK_INT is " + Build.VERSION.SDK_INT);

Log.d("Download", "Build.VERSION_CODES.GINGERBREAD is " + Build.VERSION_CODES.GINGERBREAD);

if(Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD)

{

return false;

}

Log.d("download", "can download");

Intent intent = new Intent(Intent.ACTION_MAIN);

intent.addCategory(Intent.CATEGORY_LAUNCHER);

intent.setClassName("com.android.providers.downloads.ui", "com.android.providers.downloads.ui.DownloadList");

List<ResolveInfo> list = context.getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);

Log.d("Download", "List size is " + list.size());

return list.size() > 0;

}

catch(Exception e)

{

return false;

}

}