如何设置使用android相机拍摄的照片的尺寸和质量？

Question

我编写了这个代码，用相机拍摄一张照片，然后将其转换为jpeg文件并将其作为ParseFile上传到Parse.com。

问题是，图片真的很小（153 x 204像素），真的很低质量。

我需要图片的质量至少为5MP并将其裁剪为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(); 
     } 

在此先感谢。

Answer 1

检查this answer here.

相机意图默认返回一个缩略图，所以你需要 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。

真正的果汁在于获取完整图像，其发生在这里 -

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

完整路径将由getRealPathFromURI()给出。

Answer 2

检查以下

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 

全样本的链接

@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; 
}