[英]Download Files into a certain path in the internal Storage { C# Xamarin }
目前我很好奇如何在您的 android 设备上下载文件并将文件保存到 INTERNAL STORAGE 上的某个路径。 最后我想得到的结果是:如果用户单击一个按钮,它将开始下载并替换定义的路径中的文件。
感谢任何帮助!
使用我当前的代码,我尝试直接修改它,但没有成功......
祝你们有美好的一天,感谢阅读!
*霜
Renegade = new Command(async () =>
{
string pak5 = "";
Stream stream1 = File.OpenRead(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal) + "Android/data/com.epicgames.fortnite/files/InstalledBundles/FortniteBR/FortniteGame/Content/Paks/pakchunk10_s5-Android_ASTCClient.ucas");
/*using (var streamWriter = new StreamWriter(pak5, true))
{
streamWriter.WriteLine(DateTime.UtcNow);
}
using (var streamReader = new StreamReader(pak5))
{
string content = streamReader.ReadToEnd();
System.Diagnostics.Debug.WriteLine(content);
}*/
StreamReader reader = new StreamReader(stream1);
string pakspath = reader.ReadToEnd();
//80000000
//80000000
//System.IO.File.Delete("/storage/emulated/0/Android/data/com.epicgames.fortnite/files/InstalledBundles/FortniteBR/FortniteGame/Content/Paks/pakchunk10_s5-Android_ASTCClient.ucas ");
//Utilities.Convert(Body, Body1, pakspath, 80000000);
//Utilities.Convert(Mat, Mat1, pakspath, 8981062);
ReplaceBytes(pakspath, 8981045, S1);
ReplaceBytes(pakspath, 8981045, S2);
ReplaceBytes(pakspath, 80782548, S3);
ReplaceBytes(pakspath, 80782548, S4);
ReplaceBytes(pakspath, 80782571, S5);
ReplaceBytes(pakspath, 80782571, S6);
});
如果您使用的是 Xamarin forms 那么,这是我的解决方案。在您的 ZE84E30B9390CDB64DDB6888 项目上像这样制作一个 class。
public class DroidFileHelper
{
public string GetLocalFilePath(string filename)
{
string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
return Path.Combine(path, filename);
}
public async Task SaveFileToDefaultLocation(string fileName, byte[] bytes, bool showFile = false)
{
Context currentContext = Android.App.Application.Context;
string directory = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, Android.OS.Environment.DirectoryDownloads);
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
string file = Path.Combine(directory, fileName);
System.IO.File.WriteAllBytes(file, bytes);
//If you want to open up the file after download the use below code
if (showFile)
{
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.N)
{
string externalStorageState = global::Android.OS.Environment.ExternalStorageState;
var externalPath = global::Android.OS.Environment.ExternalStorageDirectory.Path + "/" + global::Android.OS.Environment.DirectoryDownloads + "/" + fileName;
File.WriteAllBytes(externalPath, bytes);
Java.IO.File files = new Java.IO.File(externalPath);
files.SetReadable(true);
string application = "application/pdf";
Intent intent = new Intent(Intent.ActionView);
Android.Net.Uri uri = FileProvider.GetUriForFile(currentContext, "com.companyname.appname.provider", files);
intent.SetDataAndType(uri, application);
intent.SetFlags(ActivityFlags.GrantReadUriPermission);
Forms.Context.StartActivity(intent);
}
else
{
Intent promptInstall = new Intent(Intent.ActionView);
promptInstall.SetDataAndType(Android.Net.Uri.FromFile(new Java.IO.File(file)), "application/pdf");
promptInstall.SetFlags(ActivityFlags.NewTask);
Forms.Context.StartActivity(promptInstall);
}
}
}
}
之后就像从您的 xamarin 表格中一样调用它。
Xamarin.Forms.DependencyService.Get<IFileHelper>().SaveFileToDefaultLocation(oFile.FileName, oFile.FileInBytes, true);
它将您的文件保存到下载,因为我们在我们的机器人助手 class 中将路径设置为Android.OS.Environment.DirectoryDownloads
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