Question

我通过调用

使用默认相机拍摄照片

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, ApplicationData.CAMERA_REQUEST);

然后我将照片保存到SD卡并检索它并将其设置为ImageView

OutputStream output;
Bitmap photo = (Bitmap) data.getExtras().get("data");
output = new FileOutputStream(file);
photo.compress(Bitmap.CompressFormat.PNG, 100, output);
output.flush();
output.close();
mThumbnaiImagelLayout.setVisibility(View.VISIBLE);
mImageThumbNail.setImageBitmap(photo);

我想要的ImageView与设备的缩略图完全相同。例如：

但它变得像这样

所以我的问题是：

1 /如何调整捕获的图像大小？

2 /有没有其他方法我可以将图像设置为没有位图的ImageView？因为当我使用Bitmap设置ImageView时，它看起来很糟糕，就像这样（图像大小为512x512）

请帮我解决这个问题。谢谢！

Answer 1

确定这种情况正在发生，因为当你从附加组件中获取图像时，＃34;数据＆＃34; android实际上是向您发送该点击图像的缩略图版本。为了获得完整尺寸的图像，您将不得不这样做

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            // Ensure that there's a camera activity to handle the intent
            if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
                // Create the File where the photo should go
                File photoFile = null;
                try {
                    photoFile = setUpPhotoFile();
                } catch (IOException ex) {
                    // Error occurred while creating the File

                }
                // Continue only if the File was successfully created
                if (photoFile != null) {
                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                            Uri.fromFile(photoFile));



                    getActivity().startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
                }
            }

然后是活动结果

您可以使用photoFile变量来提取真实图像

Answer 2

试试这个

机器人：scaleType = “fitCenter”

Answer 3

如果你使用Bundle extras = data.getExtras（）;在你的onActivityResult中，它将返回缩略图而不是实际图像。

以下是我用于捕获和保存摄像机图像然后将其显示到imageview的代码。

这是打开拍摄相机图像活动的方法。

private static final int CAMERA_PHOTO = 111;
private Uri imageToUploadUri;

private void captureCameraImage() {
        Intent chooserIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        File f = new File(Environment.getExternalStorageDirectory(), "POST_IMAGE.jpg");
        chooserIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
        imageToUploadUri = Uri.fromFile(f);
        startActivityForResult(chooserIntent, CAMERA_PHOTO);
    }

那么你的onActivityResult（）方法应该是这样的。

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

        if (requestCode == CAMERA_PHOTO && resultCode == Activity.RESULT_OK) {
            if(imageToUploadUri != null){
                Uri selectedImage = imageToUploadUri;
                getContentResolver().notifyChange(selectedImage, null);
                Bitmap reducedSizeBitmap = getBitmap(imageToUploadUri.getPath());
                if(reducedSizeBitmap != null){
                    imageview.setImageBitmap(reducedSizeBitmap);
                }else{
                    Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
                }
            }else{
                Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
            }
        } 
    }

这是onActivityResult（）中使用的getBitmap（）方法。

private Bitmap getBitmap(String path) {

        Uri uri = Uri.fromFile(new File(path));
        InputStream in = null;
        try {
            final int IMAGE_MAX_SIZE = 1200000; // 1.2MP
            in = getContentResolver().openInputStream(uri);

            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(in, null, o);
            in.close();


            int scale = 1;
            while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) >
                    IMAGE_MAX_SIZE) {
                scale++;
            }
            Log.d("", "scale = " + scale + ", orig-width: " + o.outWidth + ", orig-height: " + o.outHeight);

            Bitmap b = null;
            in = getContentResolver().openInputStream(uri);
            if (scale > 1) {
                scale--;
                // scale to max possible inSampleSize that still yields an image
                // larger than target
                o = new BitmapFactory.Options();
                o.inSampleSize = scale;
                b = BitmapFactory.decodeStream(in, null, o);

                // resize to desired dimensions
                int height = b.getHeight();
                int width = b.getWidth();
                Log.d("", "1th scale operation dimenions - width: " + width + ", height: " + height);

                double y = Math.sqrt(IMAGE_MAX_SIZE
                        / (((double) width) / height));
                double x = (y / height) * width;

                Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x,
                        (int) y, true);
                b.recycle();
                b = scaledBitmap;

                System.gc();
            } else {
                b = BitmapFactory.decodeStream(in);
            }
            in.close();

            Log.d("", "bitmap size - width: " + b.getWidth() + ", height: " +
                    b.getHeight());
            return b;
        } catch (IOException e) {
            Log.e("", e.getMessage(), e);
            return null;
        }
    }

如何调整默认摄像头拍摄的图像大小？

3 个答案: