android照相、图片压缩

来源：互联网发布：私人影院点播软件编辑：程序博客网时间：2024/05/01 18:59

1.简单方式（此时得到的图片是缩略图，清晰度比原图差很多）

Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);if (captureIntent.resolveActivity(getPackageManager()) != null)    startActivityForResult(captureIntent, IMAGE_CAPTURE);
然后在onActivityResult里面这么写

        if (requestCode == IMAGE_CAPTURE)            if (resultCode == RESULT_OK) {                Bitmap bitmap = (Bitmap)data.getExtras().get("data");                // deal bitmap...            }

2.获取原图

        Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);        if (captureIntent.resolveActivity(getPackageManager()) != null) {            File imgFile = getImageSaveFile(); //getImageSaveFile可以根据需要写            captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(imgFile));            startActivityForResult(captureIntent, IMAGE_CAPTURE);        }
下面是getImageSaveFile的一个简单例子（实际使用外存时还应该检测外存是否可读可写，在android6.0上还需要检测是否有读写外存的权限）
        String postfix = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss").format(new Date());        File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),                "image_" + postfix);        mImgFilePath = file.getAbsolutePath();        return file;


然后在onActivityResult里这么写
if (requestCode == 3) {<span style="white-space:pre"></span>if (resultCode == RESULT_OK) {                ImageView imgView = (ImageView)findViewById(R.id.image); //imgView是我用来测试的，可以忽略                int outWidth = imgView.getWidth();                int outHeight = imgView.getHeight();                Bitmap bitmap = ImageResizer.getImage(mImgFilePath, outWidth, outHeight); //ImageResizer用于图片压缩，因为原图一般很大，可能几M到几十M不等                imgView.setImageBitmap(bitmap);            }
ImageResizer：

    public static Bitmap getImage(String path, int widthRequire, int heightRequire) {        BitmapFactory.Options btOptions = new BitmapFactory.Options();        btOptions.inJustDecodeBounds = true;        BitmapFactory.decodeFile(path, btOptions);        btOptions.inSampleSize = caculateInSampleSize(btOptions.outWidth, btOptions.outHeight,                widthRequire, heightRequire);        btOptions.inJustDecodeBounds = false;        Bitmap bitmap = BitmapFactory.decodeFile(path, btOptions);        return bitmap;    }        private static int caculateInSampleSize(int outWidth, int outHeight, int widthRequire,                                            int heightRequire)    {        int inSampleSize = 1;        while (outWidth > widthRequire && outHeight > heightRequire) {            outWidth /= 2;            outHeight /= 2;            inSampleSize *= 2;        }        return inSampleSize;    }

貌似三星手机获取照相原图时图片是颠倒90度的（至少三星s3和s6是这样），我在上面的ImageResizer的getImage方法中log了一下outWidth和outHeight，结果outWidth和outHeight和我预料的正常结果

刚好相反，貌似像素存储的时候就是倒置的，不太懂

可以用下面的方法解决（先获取图片的倒置角度，然后旋转图片）

获取图片倒置的角度：

    public static int getCameraPhotoOrientation(String imagePath) {        int rotate = 0;        try {            ExifInterface exif = new ExifInterface(imagePath);            int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,                    ExifInterface.ORIENTATION_NORMAL);            switch (orientation) {                case ExifInterface.ORIENTATION_ROTATE_270:                    rotate = 270;                    break;                case ExifInterface.ORIENTATION_ROTATE_180:                    rotate = 180;                    break;                case ExifInterface.ORIENTATION_ROTATE_90:                    rotate = 90;                    break;            }        } catch (Exception e) {            e.printStackTrace();        }        return rotate;    }

旋转图片：

public static Bitmap roateBitmap(Bitmap bitmap, int degree) {    if (degree == 0) {        return bitmap;    }    Matrix matrix = new Matrix();    matrix.postRotate(degree);    Bitmap bmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);    return bmp;}

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