将位图保存到文件 - Xamarin、Monodroid [英] Saving Bitmap to File - Xamarin, Monodroid

问题描述

我正在尝试将位图图像保存到手机内的目录(图库)中.该应用程序是在 Xamarin 中开发的，因此代码是 C#.

I am trying to save a bitmap image to a directory (gallery) inside my phone. The app is being developed in Xamarin so the code is C#.

我似乎无法弄清楚如何创建目录并保存位图.有什么建议吗?

I cant seem to figure out how to make a directory, and save a Bitmap. Any suggestions?

public void createBitmap(View view){ 
    view.DrawingCacheEnabled = true; 
    view.BuildDrawingCache (true); 
    Bitmap m_Bitmap = view.GetDrawingCache(true);

    String storagePath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
    Java.IO.File storageDirectory = new Java.IO.File(storagePath);
    //storageDirectory.mkdirs ();


    //save the bitmap
    //MemoryStream stream = new MemoryStream ();
    //m_Bitmap.Compress (Bitmap.CompressFormat.Png, 100, stream);
    //stream.Close();


    try{

        String filePath = storageDirectory.ToString() + "APPNAME.png";
        FileOutputStream fos = new FileOutputStream (filePath);
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        m_Bitmap.Compress (Bitmap.CompressFormat.Png, 100, bos);
        bos.Flush();
        bos.Close();
    } catch (Java.IO.FileNotFoundException e) {
        System.Console.WriteLine ("FILENOTFOUND");
    } catch (Java.IO.IOException e) {
        System.Console.WriteLine ("IOEXCEPTION");
    }

推荐答案

这是一种将 Bitmap 导出为 PNG 的slim 方式- 仅使用 C# 内容将文件复制到 sd 卡:

This here is a slim way to export a Bitmap as PNG-file to the sd-card using only C# stuff:

void ExportBitmapAsPNG(Bitmap bitmap)
{
    var sdCardPath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
    var filePath = System.IO.Path.Combine(sdCardPath, "test.png");
    var stream = new FileStream(filePath, FileMode.Create);
    bitmap.Compress(Bitmap.CompressFormat.Png, 100, stream);
    stream.Close();
}

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