從xamarin的文件路徑顯示圖像

Question

我試圖從路徑顯示圖像。如果我將圖像移動到可繪製的位置，我可以顯示圖像，但是我想從圖像路徑顯示圖像。我嘗試使用帶有GetImageBitmapFromUrl（「圖像路徑」）的imageBitMap，但它只顯示一個空白屏幕。借調的方式我想是Android.Net.Uri URL = Android.Net.Uri.Parse（下稱「映像路徑」）

namespace SetPictureUrl 
[Activity(Label = "SetPictureUrl", MainLauncher = true, Icon = "@drawable/icon")] 
public class MainActivity : Activity 
{ 
    protected override void OnCreate(Bundle bundle) 
    { 
     base.OnCreate(bundle); 
     SetContentView(Resource.Layout.Main);`{ 


     ImageView imagen = FindViewById<ImageView>(Resource.Id.demoImageView); 
     //------------------ i tried but did not work. the screen is blank 
     // var imageBitmap = GetImageBitmapFromUrl("my image path"); 
     // imagen.SetImageBitmap(imageBitmap); 


     //---------------- i tried but did not work. the screen is blank 
     Android.Net.Uri url = Android.Net.Uri.Parse("./HTC Desire 620/Internal storage/storage/emulated/0/test/fox.jpeg"); 
     imagen.SetImageURI(url); 


     //----- this work but is not the way i wish to do it. my main program work with file paths 
     // imagen.SetImageResource(Resource.Drawable.fox); 

    } 

我打過電話，鑑於這樣的路徑，但似乎並沒有發揮作用 例如：

（./HTC慾望620 /內部存儲/存儲/模擬/ 0 /測試/ fox.jpeg）

，（HTC慾望620 /內部存儲/存儲/模擬/ 0 /測試/ fox.jpeg）

and（¬/ HTC Desire 620/Internal storage/storage/emulated/0/test/fox.jpeg）

但沒有喜悅。我會喜歡任何幫助。不確定爲什麼這給了我很多問題/

Answer 1

你能試試嗎？

   Android.Net.Uri uri = Android.Net.Uri.FromFile(new Java.IO.File(filePath)); 

       System.IO.Stream input = this.ContentResolver.OpenInputStream(uri); 

       //Use bitarray to use less memory      
       byte[] buffer = new byte[16 * 1024]; 
       using (MemoryStream ms = new MemoryStream()) 
       { 
        int read; 
        while ((read = input.Read(buffer, 0, buffer.Length)) > 0) 
        { 
         ms.Write(buffer, 0, read); 
        } 
        pictByteArray = ms.ToArray(); 
       } 

       input.Close(); 

       //Get file information 
       BitmapFactory.Options options = new BitmapFactory.Options { InJustDecodeBounds = true }; 
       Bitmap bitmap = BitmapFactory.DecodeByteArray(pictByteArray, 0, pictByteArray.Length, options); 

       imagen.SetImageBitmap(bitmap);