Android - 在发送前调整图片大小和裁剪图片而不保存

Question

请原谅我的英语不好，我是法国人！

在我的 Android 应用程序中，我必须调整图片大小并从图库中裁剪图片，然后再将其发送到服务器没有保存它。

这是我要发送到服务器的代码：

    HttpURLConnection connection = null;
    DataOutputStream outputStream = null;

    String pathToOurFile = imagePath;
    String urlServer = "http://ip/serverApp/upload/transfert.php";
    Log.e("UploadImage", urlServer);
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary =  "*****";

    try
    {
        File file = new File(imagePath);
        FileInputStream fileInputStream = new FileInputStream(file);
        byte[] bytes = new byte[(int) file.length()];
        fileInputStream.read(bytes);
        fileInputStream.close();

        URL url = new URL(urlServer);
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
        connection.setDoOutput(true);
        outputStream = new DataOutputStream( connection.getOutputStream() );
        outputStream.writeBytes(twoHyphens + boundary + lineEnd);
        outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + pathToOurFile +"\"" + lineEnd);
        outputStream.writeBytes(lineEnd);

        int bufferLength = 1024;
        for (int i = 0; i < bytes.length; i += bufferLength) {
            int progress = (int)((i / (float) bytes.length) * 100);
            publishProgress(progress);
            if (bytes.length - i >= bufferLength) {
                outputStream.write(bytes, i, bufferLength);
            } else {
                outputStream.write(bytes, i, bytes.length - i);
            }
        }

        outputStream.writeBytes(lineEnd);
        outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

        outputStream.close();
        outputStream.flush();

        InputStream inputStream = connection.getInputStream();

        // read the response
        inputStream.close();

        int serverResponseCode = connection.getResponseCode();
        String serverResponseMessage = connection.getResponseMessage();


        Log.w("Upload image", "Response -> Code:"+serverResponseCode+" Message:"+serverResponseMessage);

        return serverResponseCode;
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
    }

现在我需要编写代码来调整图片大小并裁剪图片，以获得 350px/350px 大小的图片。

你知道我是怎么做到的吗？

非常感谢。

Answer 1

好的！！！！ 对于正确的方法，请遵循此代码！

但是：小心，这是一个例子！ -> 你不应该在主线程中做一个互联网请求

为了执行这段代码，函数exec();应该被放入一个asyncTask<Object, Object, Object>();的“doInBackground()”中

startActivityForResult() 和 onActivityResult() 的 override 应该进入一个活动类

告诉我它是否正确！！！！

private int ACTIVITY_ID_PICK_PHOTO = 42;
private int maxWidth = 350;
private int maxHeight = 350;
private String url = "http://ip/serverApp/upload/transfert.php"

//Call the activity for select photo into the gallery
private void SelectPhoto(){
    Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
    photoPickerIntent.setType("image/*");
    startActivityForResult(photoPickerIntent, ACTIVITY_ID_PICK_PHOTO);
}

// check the return of the result
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
//check th id of the result
    if (requestCode == ACTIVITY_ID_PICK_PHOTO)
        selectPhotoControl(data);
}

//Working data
private void selectPhotoControl(Intent data) {
//check if any photo is selected
    if (data == null)
        return;
//get the uri of the picture selected
    Uri photoUri = data.getData();
    if (photoUri != null) {
//decode the Uri
        String[] filePathColumn = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(photoUri,
                filePathColumn, null, null, null);
        cursor.moveToFirst();
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
//get the uri of the image
        String filePath = cursor.getString(columnIndex);
        cursor.close();
//get the image in the bitmap and resize the image
        Bitmap bp = resize(filePath);
        if (bp != null)
            postImage(bp, filePath);
    }
}

public static HttpResponse postImage(Bitmap bp, String uristr) throws ClientProtocolException, IOException {
//initialization of the postrequest
        HttpPost httpPost = new HttpPost(url);
//create the multipart entitiy (if you want send another content)
        MultipartEntity entity = new MultipartEntity(
//the boundary for separate the informations
        HttpMultipartMode.BROWSER_COMPATIBLE, "------CustomBoundary", null);
        if (bp != null) {
//create the bytes array for send the image
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
//if you want to compress the image -> write the result into bos
            bp.compress(CompressFormat.JPEG, 100, bos);
//get the filename of the image
            String filename = uristr.substring(uristr.lastIndexOf("/") + 1,
                    uristr.length());
//put the picture into the body of this part
            FormBodyPart fbp = new FormBodyPart("photo", new ByteArrayBody(
                    bos.toByteArray(), "image/jpeg", filename));
//add the part to the entity
            entity.addPart(fbp);
        }
//set the entity into the request
            httpPost.setEntity(entity);
//execute the request
        return exec(httpPost);
    }

protected synchronized static HttpResponse exec(HttpRequestBase base) throws ClientProtocolException, IOException{
    if (base != null)
//Execute the request
        return mHttpClient.execute(base);
    else
        return null;
}

private Bitmap resize(String path){
// create the options
    BitmapFactory.Options opts = new BitmapFactory.Options();

//just decode the file
    opts.inJustDecodeBounds = true;
    Bitmap bp = BitmapFactory.decodeFile(path, opts);

//get the original size
    int orignalHeight = opts.outHeight;
    int orignalWidth = opts.outWidth;
//initialization of the scale
    int resizeScale = 1;
//get the good scale
    if ( orignalWidth > maxWidth || orignalHeight > maxHeight ) {
       final int heightRatio = Math.round((float) orignalHeight / (float) maxHeight);
       final int widthRatio = Math.round((float) orignalWidth / (float) maxWidth);
       resizeScale = heightRatio < widthRatio ? heightRatio : widthRatio;
    }
//put the scale instruction (1 -> scale to (1/1); 8-> scale to 1/8)
    opts.inSampleSize = resizeScale;
    opts.inJustDecodeBounds = false;
//get the futur size of the bitmap
    int bmSize = (orignalWidth / resizeScale) * (orignalHeight / resizeScale) * 4;
//check if it's possible to store into the vm java the picture
    if ( Runtime.getRuntime().freeMemory() > bmSize ) {
//decode the file
        bp = BitmapFactory.decodeFile(path, opts);
    } else
        return null;
    return bp;
}

Answer 2

这个答案[基于另一个答案][1]，但我对该代码有一些问题，所以我发布了经过编辑和工作的代码。

我是这样做的：

BitmapFactory.Options options = new BitmapFactory.Options();
options.outWidth = 50; //pixels
options.outHeight = 50; //pixels
InputStream in = context.getContentResolver().openInputStream(data.getData()); // here, you need to get your context.
Bitmap bitmap = BitmapFactory.decodeStream(in, null, options);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] bitmapdata = baos.toByteArray();

请注意，data 是您用来获取文件的 Intent 返回的数据。如果你已经有了文件路径，就用那个...

现在，当您创建 HTTP 实体时，添加：

 FormBodyPart fbp = new FormBodyPart("image", new ByteArrayBody(baos.toByteArray(), "image/jpeg", "image"));
 entity.addPart(fbp);

另外，请注意您需要一个 MultipartEntity 来上传文件。