如何提高质量的位图？ [英] How to increase Bitmap quality?

问题描述

在我工作的应用程序，一个按钮打开相机。当你拍摄一张照片，该照片被装入应用程序为位图。这些照片是非常像素化。我怎样才能提高位图的质量已经加载到我的应用程序后？

code迄今：

 私有静态最终诠释CAMERA_PIC_REQUEST = 2500;
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;    按钮捕捉=（按钮）findViewById（R.id.captureButton）;
    按钮翻转=（按钮）findViewById（R.id.flipButton）;
    最后的TextView文本=（TextView的）findViewById（R.id.text）;
    capture.setOnClickListener（新View.OnClickListener（）{        公共无效的onClick（视图v）{
            意图cameraIntent =新意图（android.provider.MediaStore.ACTION_IM​​AGE_CAPTURE）;
            text.setVisibility（View.GONE）;
            startActivityForResult（cameraIntent，CAMERA_PIC_REQUEST）;
        }
    }）;
    flip.setOnClickListener（新View.OnClickListener（）{        公共无效的onClick（视图v）{
        }
    }）;
}保护无效的onActivityResult（INT申请code，INT结果code，意图数据）{
    如果（要求code == CAMERA_PIC_REQUEST）{
        。位图图像=（位图）data.getExtras（）获得（数据）;
        ImageView的ImageView的=（ImageView的）findViewById（R.id.ImageView01）;
        imageView.setImageBitmap（图片）;
    }
  }
}
 

解决方案

不要从数据的形象，它始终是一个低质量的图像。尝试使用文件的路径和文件路径获取图像。

打开摄像机

 意向意图=新意图（android.media.action.IMAGE_CAPTURE）;
intent.putExtra（MediaStore.EXTRA_VIDEO_QUALITY，1）;
intent.putExtra（MediaStore.EXTRA_OUTPUT，Uri.fromFile（路径））;
startActivityForResult（意向，CAMERA_PIC_REQUEST）;
 

和当您返回到的onActivityResult图像将被存储到您定义的路径。你可以从那里得到的高分辨率图像。或者，你也可以使用一个函数来获取最后拍摄的图像...

 私人字符串getLastImagePath（）{
        最终的String [] = imageColumns {MediaStore.Images.Media._ID，
                MediaStore.Images.Media.DATA};
        最后弦乐imageOrderBy = MediaStore.Images.Media._ID +DESC;
        光标imageCursor = managedQuery（
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI，imageColumns，
                NULL，NULL，imageOrderBy）;
        如果（imageCursor.moveToFirst（））{
            INT ID = imageCursor.getInt（imageCursor
                    .getColumnIndex（MediaStore.Images.Media._ID））;
            字符串FULLPATH = imageCursor.getString（imageCursor
                    .getColumnIndex（MediaStore.Images.Media.DATA））;
            返回完整路径;
        }其他{
            返回;
        }
    }
 

此函数将返回你最后拍摄的图像路径​​。

In the app I'm working on, a button opens the camera. When you take a picture, that picture is loaded into the app as a Bitmap. The pictures are very pixelated. How can I increase the quality of the bitmap after it has been loaded into my app?

Code so far:

private static final int CAMERA_PIC_REQUEST = 2500;




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



    Button capture = (Button) findViewById(R.id.captureButton);
    Button flip = (Button) findViewById(R.id.flipButton);
    final TextView text = (TextView) findViewById(R.id.text);


    capture.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            text.setVisibility(View.GONE);
            startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
        }
    }); 


    flip.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {




        }
    });
}

protected void onActivityResult(int requestCode, int resultCode, Intent data){
    if(requestCode == CAMERA_PIC_REQUEST){
        Bitmap image = (Bitmap) data.getExtras().get("data");
        ImageView imageView = (ImageView) findViewById(R.id.ImageView01);
        imageView.setImageBitmap(image);
    }
  }
}  

解决方案

Do not get that image from data, it is always a low quality image. Try using a file path and get the image from file path.

Open Camera

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(path));
startActivityForResult(intent, CAMERA_PIC_REQUEST);

And when you return to onActivityResult the image will be stored to your defined path. You can get the high resolution image from there. Or you can also use a function to get last captured image ...

    private String getLastImagePath() {
        final String[] imageColumns = { MediaStore.Images.Media._ID,
                MediaStore.Images.Media.DATA };
        final String imageOrderBy = MediaStore.Images.Media._ID + " DESC";
        Cursor imageCursor = managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, imageColumns,
                null, null, imageOrderBy);
        if (imageCursor.moveToFirst()) {
            int id = imageCursor.getInt(imageCursor
                    .getColumnIndex(MediaStore.Images.Media._ID));
            String fullPath = imageCursor.getString(imageCursor
                    .getColumnIndex(MediaStore.Images.Media.DATA));
            return fullPath;
        } else {
            return "";
        }
    }

This function will return you the last captured image path.

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