如何设置使用android相机拍摄的照片的大小和质量？

Question

我写了这段代码，用相机拍照，然后将其转换为jpeg文件并将其上传到Parse.com作为ParseFile。

问题是，图片非常小（153 x 204像素），质量非常低。

我需要图片是至少5 MP质量和裁剪到300x300像素。

这是我现在使用的代码。

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_picture);

        img = (ImageView) findViewById(R.id.imgV);

        Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        byte[] image_byte_array;
              ParseObject post_object = new ParseObject("Gallery");
            Bundle extras = data.getExtras();
            Bitmap image = (Bitmap) extras.get("data");
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            image.compress(Bitmap.CompressFormat.JPEG, 100, stream);
            image_byte_array = stream.toByteArray();
            ParseFile picture_file = new ParseFile("Picture.jpg", image_byte_array);
            picture_file.saveInBackground();
            post_object.put("photo", picture_file);
            post_object.saveInBackground();
        }

提前感谢。

Answer 1

查看下面的链接

http://developer.android.com/guide/topics/media/camera.html#intent-image

您必须添加一个Uri，这是文件的Uri来存储照片

intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name

完整样品

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_picture);

    img = (ImageView) findViewById(R.id.imgV);

    // create Intent to take a picture and return control to the calling application
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name

    // start the image capture Intent
    startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}

/** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(int type){
      return Uri.fromFile(getOutputMediaFile(type));
}

/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.

    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
              Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            Log.d("MyCameraApp", "failed to create directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE){
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "IMG_"+ timeStamp + ".jpg");
    } else if(type == MEDIA_TYPE_VIDEO) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "VID_"+ timeStamp + ".mp4");
    } else {
        return null;
    }

    return mediaFile;
}

Answer 2

在这里检查这个答案。

默认情况下，相机会返回缩略图，因此需要获取完整图像。

德里克的解决方案是正确的，但你必须改进它

真正的乐趣在于获取这里发生的完整图像-

thumbnail = MediaStore.Images.Media.getBitmap(
                            getContentResolver(), imageUri);
                    imgView.setImageBitmap(thumbnail);
                    imageurl = getRealPathFromURI(imageUri);    

完整路径将由getRealPathFromURI（）给出。