以原始形式保存图像，无需压缩

Question

我想保存图像而不压缩它，并希望以其原始形式保存它，即当图像被压缩时，图像大小减小，图像变小。我使用原生相机为此目的。我在Android Studio工作。我正在制作一个应用程序，其中我使用相机来保存图像。但是图像被压缩，非常小，质量非常低。

下面是我保存图像的代码

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

    final LocationSettingsStates states = LocationSettingsStates.fromIntent(data);
    if(requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
    {
        if(resultCode == Activity.RESULT_OK)
        {
            Bitmap bmp = (Bitmap)data.getExtras().get("data");
            ByteArrayOutputStream stream = new ByteArrayOutputStream();

            bmp.compress(Bitmap.CompressFormat.JPEG, 100, stream);
            byte[] byteArray = stream.toByteArray();

            // convert byte array to Bitmap
            Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);

            if(isStoragePermissionGranted())
            {
                SaveImage(bitmap);
            }


        }
    }else {
        switch (requestCode) {
            case 1000:
                switch (resultCode) {
                    case Activity.RESULT_OK:
                        // All required changes were successfully made
                        getLocation();
                        break;
                    case Activity.RESULT_CANCELED:
                        // The user was asked to change settings, but chose not to
                        Toast.makeText(this, "Location Service not Enabled", Toast.LENGTH_SHORT).show();
                        break;
                    default:
                        break;
                }
                break;
        }

    }


}

private void SaveImage(Bitmap finalBitmap) {

    File storageDir = new File (String.valueOf(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)));
    String root = storageDir + Environment.getExternalStorageDirectory().getAbsolutePath().toString();
    Log.v(LOG_TAG, root);
    File myDir = new File(root + "/captured_images");
    if (!myDir .exists())
    {
        myDir .mkdirs();
    }
    Random generator = new Random();
    int n = 1000;
    n = generator.nextInt(n);
    String fname = "Image-" + n + ".jpg";
    File file = new File(myDir,fname);
    try {
        file.createNewFile();
        MediaScannerConnection.scanFile(getApplicationContext(), new String[]  {file.getPath()} , new String[]{"image/*"}, null);
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.JPEG,100,out);
        out.flush();
        out.close();

    } catch (Exception e) {
        e.printStackTrace();
    }

}

更新1

为了更好地理解，我将我的onClick方法

   btn_camera.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Check permission for camera

            if(ActivityCompat.checkSelfPermission(MainActivity.this, CAMERA)
                    != PackageManager.PERMISSION_GRANTED)
            {
                // Check Permissions Now
                // Callback onRequestPermissionsResult interceptado na Activity MainActivity

                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{CAMERA},
                        MainActivity.REQUEST_CAMERA);
            }
            else {


                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE );

            }


        }
    });

我搜索了解决方案，发现我可以使用AndroidBitmapUtil类，所以我复制并粘贴了这个类到我的项目中，也就是说，我创建了一个新类。但我不知道如何使用它。尽管有人说我可以通过执行new AndroidBmpUtil（）来保存图像。保存（bmImage，file） 。但我还是无法匹配我的代码：(

任何帮助都将不胜感激




Answer 1

开放式摄像机使用

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
 File f = new File(android.os.Environment.getExternalStorageDirectory(), "imagename.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(intent, 1);

在onActivityresult方法中使用

if (requestCode == 1) {
 File f = new File(Environment.getExternalStorageDirectory().toString());
  for (File temp : f.listFiles()) {
   if (temp.getName().equals("imagename.jpg")) {
    f = temp;
     break;
  }
  }
  try {
   Bitmap bitmap;
   BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();

       bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),bitmapOptions);

      yourimageview.setImageBitmap(bitmap);

  } catch (Exception e) {
    e.printStackTrace();
  }
 }

Answer 2

打开相机并将图像保存到特定的目录中。

解决方案1

private String pictureImagePath = "";

private void openBackCamera() {

String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());

String imageFileName = timeStamp + ".jpg";

File storageDir = Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_PICTURES);

pictureImagePath = storageDir.getAbsolutePath() + "/" + imageFileName;

File file = new File(pictureImagePath);

Uri outputFileUri = Uri.fromFile(file);

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);               

cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

startActivityForResult(cameraIntent, 1);}

处理图像

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == 1) {
File imgFile = new  File(pictureImagePath);

    if(imgFile.exists()){        

   Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

   ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);

   myImage.setImageBitmap(myBitmap);

    }
}

解决方案2

我使用了以下代码，这对我来说非常好。

        values = new ContentValues();

        values.put(MediaStore.Images.Media.TITLE, "New Picture");

        values.put(MediaStore.Images.Media.DESCRIPTION, "From your Camera");

        imageUri = getContentResolver().insert(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);

        startActivityForResult(intent, PICTURE_RESULT);

而且还

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    switch (requestCode) {

    case PICTURE_RESULT:

        if (requestCode == PICTURE_RESULT)

            if (resultCode == Activity.RESULT_OK) {

                try {

                    thumbnail = MediaStore.Images.Media.getBitmap(

                            getContentResolver(), imageUri);

                    imgView.setImageBitmap(thumbnail);

                    imageurl = getRealPathFromURI(imageUri);    

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }
    }
}

和

public String getRealPathFromURI(Uri contentUri) {

    String[] proj = { MediaStore.Images.Media.DATA };

    Cursor cursor = managedQuery(contentUri, proj, null, null, null);

    int column_index = cursor

            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

    cursor.moveToFirst();

    return cursor.getString(column_index);
}

Answer 3

新的AndroidBmpUtil（）。保存（来源：sdcardBmpPath）；

用户在代码行上方，并遵循下面的链接

https://github.com/ultrakain/AndroidBitmapUtil