画像をキャプチャしようとしたときに空白の画面が表示されました。

Question

imageViewで画像をキャプチャしようとしましたが、このコードのようにstackoverflowの誰かが提供しましたが、 何が問題なのでしょうか？ありがとう。

private String pictureImagePath = ""; 
private void openBackCamera() { 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
    String imageFileName = timeStamp + ".jpg"; 
    File storageDir = Environment.getExternalStoragePublicDirectory(
      Environment.DIRECTORY_PICTURES); 
    pictureImagePath = storageDir.getAbsolutePath() + "/" + imageFileName; 
    File file = new File(pictureImagePath); 
    Uri outputFileUri = Uri.fromFile(file); 
    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);    
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); 
    startActivityForResult(cameraIntent, 1); 
} 

ハンドルイメージ

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == 1) { 
    File imgFile = new File(pictureImagePath); 
     if(imgFile.exists()){   
     Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath()); 
     ImageView myImage = (ImageView) findViewById(R.id.imageviewTest); 
     myImage.setImageBitmap(myBitmap); 

     } 
    } 

} 

Answer 1

ここで私は（それがMonoDroid/C＃であります申し訳ありませんが、それは、Android/Javaで動作するように光の変更が必要になります）ImageViewの内に表示するビットマップのを取得するために使用されるコードは次のとおりです。

using System.IO; 
using Android.Graphics; 
using Android.Graphics.Drawables; 
using Android.Widget; 

namespace MyApp.Util 
{ 
    public static class BitmapHelpers 
    { 
     /// <summary> 
     /// This method will recyle the memory help by a bitmap in an ImageView 
     /// </summary> 
     /// <param name="imageView">Image view.</param> 
     public static void RecycleBitmap(this ImageView imageView) 
     { 
      if (imageView == null) { 
       return; 
      } 

      Drawable toRecycle = imageView.Drawable; 
      if (toRecycle != null) { 
       ((BitmapDrawable)toRecycle).Bitmap.Recycle(); 
      } 
     } 

     public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) 
     { 
      // Raw height and width of image 
      int height = options.OutHeight; 
      int width = options.OutWidth; 
      int inSampleSize = 1; 

      if (height > reqHeight || width > reqWidth) 
      { 
       int halfHeight = height/2; 
       int halfWidth = width/2; 

       // Calculate the largest inSampleSize value that is a power of 2 and keeps both 
       // height and width larger than the requested height and width. 
       while ((halfHeight/inSampleSize) > reqHeight 
         && (halfWidth/inSampleSize) > reqWidth) { 
        inSampleSize *= 2; 
       } 
      } 

      return inSampleSize; 
     } 

     /// <summary> 
     /// Load the image from the device, and resize it to the specified dimensions. 
     /// </summary> 
     /// <returns>The and resize bitmap.</returns> 
     /// <param name="fileName">File name.</param> 
     /// <param name="width">Width.</param> 
     /// <param name="height">Height.</param> 
     public static Bitmap LoadAndResizeBitmap(this string fileName, int width, int height) 
     { 
      // First we get the the dimensions of the file on disk 
      BitmapFactory.Options options = new BitmapFactory.Options 
      { 
       InPurgeable = true, 
       InJustDecodeBounds = true 
      };      

      BitmapFactory.DecodeFile(fileName, options); 
      options.InSampleSize = calculateInSampleSize(options, width, height); 
      options.InJustDecodeBounds = false; 
      Bitmap resizedBitmap = BitmapFactory.DecodeFile(fileName, options); 

      return resizedBitmap; 
     } 
    } 
} 

使用例

public static Bitmap LoadBitmap(File imageFile, int w, int h) 
{ 
    Bitmap bitmap = null; 

    if (imageFile != null) 
    { 
     if((new File(imageFile.Path)).Exists()) 
     { 
      bitmap = imageFile.Path.LoadAndResizeBitmap(w, h); 
     } 
    } 

    return bitmap; 
} 

OnActivityResultスニペット（ギャラリーに写真を使用可能に）

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data) 
{ 
    base.OnActivityResult(requestCode, resultCode, data);   

    switch ((ActivityRequestCode)requestCode) 
    { 
     case ActivityRequestCode.Camera: 
      // make it available in the gallery 
      if (_imageFile != null) 
      { 
       Intent mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile); 
       Uri contentUri = Uri.FromFile(_imageFile); 
       mediaScanIntent.SetData(contentUri); 
       SendBroadcast(mediaScanIntent); 

       _pictureRequestingFragment.PictureReady(_imageFile); 
      } 

      break; 

     case ActivityRequestCode.Map: 
      break; 
    } 
}