使用相机意图在Android中获取捕获图像的路径

Question

我一直试图获取捕获图像的路径以删除图像.在StackOverflow上找到了很多答案,但没有一个对我有用.我得到了以下答案:

private String getLastImagePath() {
    final String[] imageColumns = { MediaStore.Images.Media._ID,
            MediaStore.Images.Media.DATA };
    final String imageOrderBy = MediaStore.Images.Media._ID + " DESC";
    Cursor imageCursor = POS.this.getContentResolver().query(
            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 "";
    }
}

此代码适用于Samsung选项卡,但在Lenovo选项卡和i-ball选项卡中不起作用.那么,任何人都可以帮我找到另一种解决方案吗？任何帮助将不胜感激.谢谢.

这是我的onActivityResult:

if (requestCode == CmsInter.CAMERA_REQUEST && resultCode == RESULT_OK) {
    //Bitmap photo = null;
    //photo = (Bitmap) data.getExtras().get("data");

    String txt = "";
    if (im != null) {
        String result = "";
        //im.setImageBitmap(photo);
        im.setTag("2");
        int index = im.getId();
        String path = getLastImagePath();
        try {
            bitmap1 = BitmapFactory.decodeFile(path, options);
            bitmap = Bitmap.createScaledBitmap(bitmap1, 512, 400, false);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
            byte[] bytData = baos.toByteArray();
            try {
                baos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            result = Base64.encode(bytData);
            bytData = null;
        } catch (OutOfMemoryError ooM) {
            System.out.println("OutOfMemory Exception----->" + ooM);
            bitmap1.recycle();
            bitmap.recycle();
        } finally {
            bitmap1.recycle();
            bitmap.recycle();
        }
    }
}

Answer 1

试试这样吧

通过相机意图,如下所示

Intent intent = new Intent(this);
startActivityForResult(intent, REQ_CAMERA_IMAGE);

捕获图像后写OnActivityResult如下

protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
        Bitmap photo = (Bitmap) data.getExtras().get("data"); 
        imageView.setImageBitmap(photo);
        knop.setVisibility(Button.VISIBLE);


        // CALL THIS METHOD TO GET THE URI FROM THE BITMAP
        Uri tempUri = getImageUri(getApplicationContext(), photo);

        // CALL THIS METHOD TO GET THE ACTUAL PATH
        File finalFile = new File(getRealPathFromURI(tempUri));

        System.out.println(mImageCaptureUri);
    }  
}

public Uri getImageUri(Context inContext, Bitmap inImage) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
    return Uri.parse(path);
}

public String getRealPathFromURI(Uri uri) {
    String path = "";
    if (getContentResolver() != null) {
        Cursor cursor = getContentResolver().query(uri, null, null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();
            int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
            path = cursor.getString(idx);
            cursor.close();
        }
    }
    return path;
}

并检查日志

编辑:

很多人都在问如何不获取缩略图.您需要为方法添加此代码getImageUri:

public Uri getImageUri(Context inContext, Bitmap inImage) {
    Bitmap OutImage = Bitmap.createScaledBitmap(inImage, 1000, 1000,true);
    String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), OutImage, "Title", null);
    return Uri.parse(path);
}

另一种方法压缩文件.您可以通过更改数字来调整大小1000,1000

Answer 2

有一个创建文件的解决方案(在外部缓存目录或其他任何地方)并将此文件的uri作为输出额外的摄像机意图 - 这将定义拍摄照片将被存储的路径.

这是一个例子:

File file;
Uri fileUri;
final int RC_TAKE_PHOTO = 1;

    private void takePhoto() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        file = new File(getActivity().getExternalCacheDir(), 
                String.valueOf(System.currentTimeMillis()) + ".jpg");
        fileUri = Uri.fromFile(file);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        getActivity().startActivityForResult(intent, RC_TAKE_PHOTO);

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RC_TAKE_PHOTO && resultCode == RESULT_OK) {

                //do whatever you need with taken photo using file or fileUri

            }
        }
    }

然后,如果您不再需要该文件,则可以使用该文件将其删除 file.delete();

顺便说一句,当用户从应用程序设置中清除应用程序的缓存时,将删除缓存目录中的文件.

Answer 3

尝试使用此方法获取original相机捕获的图像路径。

public String getOriginalImagePath() {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = getActivity().managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                projection, null, null, null);
        int column_index_data = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToLast();

        return cursor.getString(column_index_data);
    }

此方法将返回相机捕获的最后一张图像的路径。所以这个路径将是原始图像而不是缩略图位图。

Answer 4

这里我更新了 Kotlin 中的示例代码。请注意，牛轧糖及以上版本Uri.fromFile(file)无法正常工作，它会导致应用程序崩溃，因为它需要实现 FileProvider，这是从意图发送文件的最安全方式。为了实现这个，请参考这个答案或这篇文章

private fun takePhotoFromCamera() {
        val isDeviceSupportCamera: Boolean = this.packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)
        if (isDeviceSupportCamera) {
            val takePictureIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)

            if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                file = File(getExternalFilesDir(Environment.DIRECTORY_DOCUMENTS + "/attachments")!!.path,
                        System.currentTimeMillis().toString() + ".jpg")
//            fileUri = Uri.fromFile(file)
                fileUri = FileProvider.getUriForFile(this, this.applicationContext.packageName + ".provider", file!!)
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri)
                if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP) {
                    takePictureIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
                }
                startActivityForResult(takePictureIntent, Constants.REQUEST_CODE_IMAGE_CAPTURE)
            }

        } else {
            Toast.makeText(this, this.getString(R.string.camera_not_supported), Toast.LENGTH_SHORT).show()
        }
    }

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (resultCode == Activity.RESULT_OK) {
             if(requestCode == Constants.REQUEST_CODE_IMAGE_CAPTURE) {
                realPath = file?.path
                 //do what ever you want to do
            }
    }
}