將從圖庫中選取的圖像調整爲圖像視圖

Question

我的應用程序有一個ImageView活動，我從手機圖庫中挑選一張圖片，並將其設置在此ImageView中作爲用戶的個人資料圖片。

我的問題是，一些圖片時，選擇使應用程序停止原因是太大，我想知道如果有人可以看我的代碼，並幫助我如何調整這張選擇的圖片，所以設置後，用戶可以在設置之前剪下這張圖片，下面是我的代碼，我在這張圖片上拍照。如果有人做了必要的改變，並且給我代碼，我會非常感激，因爲我對開發不瞭解太多。謝謝。

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) { 
     Uri selectedImage = data.getData(); 
     String[] filePathColumn = { MediaStore.Images.Media.DATA }; 

     Cursor cursor = getContentResolver().query(selectedImage, 
       filePathColumn, null, null, null); 
     cursor.moveToFirst(); 

     int columnIndex = cursor.getColumnIndex(filePathColumn[0]); 
     String picturePath = cursor.getString(columnIndex); 
     PreferenceManager.getDefaultSharedPreferences(this).edit().putString("picturePath", picturePath).commit(); 
     cursor.close(); 

     ImageView imageView = (ImageView) findViewById(R.id.User); 
     imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath)); 

    } 

    } 

Answer 1

不是要重寫代碼，但是這可能是從我的代碼用於縮放位圖向下有用

Bitmap bitmap = BitmapFactory.decodeFile(foto.getFotoOrderFilePath()); 
    Double height = (double)bitmap.getHeight(); 
    Double scalingFactor = (960.0/height); 
    int tempWidht = bitmap.getWidth(); 
    Double Dwidth = (tempWidht*scalingFactor); 
    int width = Dwidth.intValue(); 
    Log.v("bitmap dimensions: ", String.valueOf(height) + " + " +String.valueOf(width) + " + " + String.valueOf(scalingFactor)); 
    bitmap = Utilities.scaleBitmap(bitmap, width, 960); 

的摘錄。它將高度設置爲960，並通過縮放來相應地改變寬度。

編輯：

ScaleBitmap方法。

public static Bitmap scaleBitmap(Bitmap bitmap, int wantedWidth, int wantedHeight) { 
    Bitmap output = Bitmap.createBitmap(wantedWidth, wantedHeight, Config.ARGB_8888); 
    Canvas canvas = new Canvas(output); 
    Matrix m = new Matrix(); 
    m.setScale((float) wantedWidth/bitmap.getWidth(), (float) wantedHeight/bitmap.getHeight()); 
    canvas.drawBitmap(bitmap, m, new Paint()); 
    return output; 
} 

遺憾的響應晚

Answer 2

嘗試，這是圖像壓縮像whtsapp我在我的應用程序https://www.built.io/blog/2013/03/improving-image-compression-what-weve-learned-from-whatsapp/

Answer 3

您可以使用畢加索庫已經使用。從here得到它。 語法如下：

Picasso.with(getContext()).load(imagePath).into(imageView); 

Answer 4

你可以試試這個代碼來調整圖像按您的要求

public Bitmap decodeSampledBitmapFromResource(String Filepath, 
                int reqWidth, int reqHeight) { 

    // First decode with inJustDecodeBounds=true to check dimensions 
    final BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inJustDecodeBounds = true; 
    BitmapFactory.decodeFile(Filepath, options); 

    // Calculate inSampleSize 
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 

    // Decode bitmap with inSampleSize set 
    options.inJustDecodeBounds = false; 
    return BitmapFactory.decodeFile(Filepath, options); 
} 

public int calculateInSampleSize(
     BitmapFactory.Options options, int reqWidth, int reqHeight) { 

    // Raw height and width of image 
    int inSampleSize = 1; 
    final int height = options.outHeight; 
    final int width = options.outWidth; 


    if (height > reqHeight || width > reqWidth) { 

     final int halfHeight = height/2; 
     final 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; 
} 

檢查這裏 http://developer.android.com/training/displaying-bitmaps/load-bitmap.html