java - 上传前的方形位图

Question

你好，我有以下代码用于从画廊 Activity 中获取图像，我希望在上传之前将图像平方为特定尺寸(例如 400*400)，同时保持其纵横比，以便所有上传的图像具有相同的大小。有什么想法请提出来

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        // When an Image is picked
        if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };
            assert selectedImage != null;
            Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            assert cursor != null;
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            imgPath = cursor.getString(columnIndex);
            cursor.close();
            ImageView imgView = findViewById(R.id.imagebutton);
            int width = imgView.getWidth();
            int height = imgView.getHeight();
            Bitmap bitmap = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(imgPath),width, height, false);
            imgView.setImageBitmap(bitmap);
            // Get the Image's file name
            String fileNameSegments[] = imgPath.split("/");
            fileName = fileNameSegments[fileNameSegments.length - 1];
            // Put file name in Async Http Post Param which will used in Php web app
            params.put("filename", fileName);
        } else {
            Toast.makeText(this, R.string.noimageselected,
                    Toast.LENGTH_LONG).show();
        }
    } catch (Exception e) {
        Toast.makeText(this, R.string.erroroccurred, Toast.LENGTH_LONG)
                .show();
    }
}

@Override
        protected String doInBackground(Void... params) {
            BitmapFactory.Options options = null;
            options = new BitmapFactory.Options();
            options.inSampleSize = 3;
            bitmap = BitmapFactory.decodeFile(imgPath, options);
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            // Must compress the Image to reduce image size to make upload easy
            bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
            byte[] byte_arr = stream.toByteArray();
            // Encode Image to String
            encodedString = Base64.encodeToString(byte_arr, 0);
            return "";
        }

Answer 1

添加此代码以在上传图像之前调整图像大小

int newWidth=400; 
int newHeight=400;      
Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap , newWidth, newHeight, true);

@Override
    protected String doInBackground(Void... params) {
        BitmapFactory.Options options = null;
        options = new BitmapFactory.Options();
        options.inSampleSize = 3;
        bitmap = BitmapFactory.decodeFile(imgPath, options);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        // Must compress the Image to reduce image size to make upload easy


        //Add these lines
        int newWidth=400; 
        int newHeight=400;      
        Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap , newWidth, newHeight, true);

        resizedBitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
        byte[] byte_arr = stream.toByteArray();
        // Encode Image to String
        encodedString = Base64.encodeToString(byte_arr, 0);
        return "";
    }