将位图保存到文件 - Xamarin,Monodroid

Question

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

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");
    }

Answer 1

这这里是一个苗条的出口方式Bitmap为PNG-file只使用SD卡C#的东西:

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();
}

Answer 2

改变：

String filePath = storageDirectory.ToString() + "APPNAME.png";

到：

String filePath = Path.Combine(storageDirectory.ToString(), "APPNAME.png");

您的原始代码将文件名附加到路径名中的最后一个文件夹，而不添加路径分隔符。例如，路径 of\data\data\sdcard01将创建文件路径\data\data\sdcard01APPNAME.png. 使用Path.Combine()可确保在附加目录时使用路径分隔符。