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Android - 前置摄像头错误

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我正在尝试捕获图像，但在捕获和批准后， onActivityResult(int requestCode, int resultCode, Intent data) data 始终为空 .

这就是我给相机打电话的方式：

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());
startActivityForResult(intent, Consts.ACTION_JOURNEY_CAPTURE_PHOTO_PATH);

方法getImageUri（）：

private Uri getImageUri() {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "IMG_" + timeStamp + "_";
        File albumF = helpers.getAlbumDir(getString(R.string.album_name));

        File file = new File(albumF, imageFileName);
        Uri imgUri = Uri.fromFile(file);

        return imgUri;
}

在清单上我有：

<uses-feature android:name="android.hardware.camera" />

我究竟做错了什么？

android camera

1 回答

  • 1

    图像存储在使用getImageUri（）方法获得的路径中 . 您必须保留该路径，并在onActivityResult（）内部执行以下操作：

    if (resultCode == RESULT_OK) {

        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(photoPath, options);

        Bitmap b = BitmapFactory.decodeFile(photoPath, options);

    }

    如果要调整图像大小，可以设置BitmapFactory.Options的inSampleSize，此方法对于计算inSampleSize非常有用：

    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
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