android - 上传前压缩相机图像

Question

我正在使用此代码（来自www.internetria.com）拍照并上传到服务器：

创建：

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Uri output = Uri.fromFile(new File(foto));
intent.putExtra(MediaStore.EXTRA_OUTPUT, output);
startActivityForResult(intent, TAKE_PICTURE);

活动结果：

ImageView iv = (ImageView) findViewById(R.id.imageView1);
        iv.setImageBitmap(BitmapFactory.decodeFile(foto));

        File file = new File(foto);
        if (file.exists()) {
            UploaderFoto nuevaTarea = new UploaderFoto();
            nuevaTarea.execute(foto);
        }
        else
            Toast.makeText(getApplicationContext(), "No se ha realizado la foto", Toast.LENGTH_SHORT).show();

上传者图片：

ProgressDialog pDialog;
String miFoto = "";

@Override
protected Void doInBackground(String... params) {
    miFoto = params[0];
    try { 
        HttpClient httpclient = new DefaultHttpClient();
        httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
        HttpPost httppost = new HttpPost("http://servidor.com/up.php");
        File file = new File(miFoto);
        MultipartEntity mpEntity = new MultipartEntity();
        ContentBody foto = new FileBody(file, "image/jpeg");
        mpEntity.addPart("fotoUp", foto);
        httppost.setEntity(mpEntity);
        httpclient.execute(httppost);
        httpclient.getConnectionManager().shutdown();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

我想压缩图像，因为尺寸太大。

我不知道如何添加bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);到我的应用程序

score 40 · Accepted Answer

看看这里：ByteArrayOutputStream to a FileBody

这些方面的东西应该起作用：

代替

File file = new File(miFoto);
ContentBody foto = new FileBody(file, "image/jpeg");

和

Bitmap bmp = BitmapFactory.decodeFile(miFoto)
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bmp.compress(CompressFormat.JPEG, 70, bos);
InputStream in = new ByteArrayInputStream(bos.toByteArray());
ContentBody foto = new InputStreamBody(in, "image/jpeg", "filename");

如果文件大小仍然是一个问题，除了压缩它之外，您可能还需要缩放图片。

score 6 · Accepted Answer

Convert image to Google WebP format it will save you lots of bytes see the following two articles you can also convert webP into JPG/PNG/GIF whatever you want on server side.

Java Wrapper of Google WebP API

How to check out Google WebP library and use it in Android as native library

First, you need to get pixels from Bitmap.

Bitmap bitmap = BitmapFactory.decodeFile(filePath);

int bytes = bitmap.getByteCount();
ByteBuffer buffer = ByteBuffer.allocate(bytes);
bitmap.copyPixelsToBuffer(buffer);
byte[] pixels = buffer.array();

Then, you can get WebP byte array.

int stride = bytes / height;
int quality = 100;
byte[] encoded = libwebp.WebPEncodeRGBA(pixels, width, height, stride, quality);

Test.png (Size: 106KB) Test.webp(Size: 48KB)

score 2 · Accepted Answer

使用 okhttp 我这样上传：

MediaType MEDIA_TYPE_PNG
                        = MediaType.parse("image/jpeg");

                //Compress Image
                Bitmap bmp = BitmapFactory.decodeFile(fileToUpload.getAbsolutePath());
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                bmp.compress(Bitmap.CompressFormat.JPEG, 70, bos);

                RequestBody requestBody = new MultipartBuilder()
                        .type(MultipartBuilder.FORM)
                        .addFormDataPart("photo", fileToUpload.getName(), RequestBody.create(MEDIA_TYPE_PNG, bos.toByteArray()))
                        .build();

                request = new Request.Builder()
                        .url(urlToUploadTo)
                        .post(requestBody)
                        .build();

                try {
                    response = client.newCall(request).execute();
                    if (response != null) {
                        if (response.isSuccessful()) {
                            responseResult = response.body().string();
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

score -2 · Accepted Answer

看看compressImage()方法：

public class MainActivity extends Activity {

private Uri fileUri;
private ImageView img_forCompress;
public static final int MEDIA_TYPE_IMAGE = 1;
private static final int CAMERA_REQUEST = 1888;
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private static final String IMAGE_DIRECTORY_NAME = "Ibook";
static File mediaFile;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    img_forCompress = (ImageView) findViewById(R.id.img_forCompress);

    img_forCompress.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

            intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

            // start the image capture Intent
            startActivityForResult(intent,
                    CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
        }
    });

}

public Uri getOutputMediaFileUri(int type) {
    return Uri.fromFile(getOutputMediaFile(type));
}

private static File getOutputMediaFile(int type) {

    // External sdcard location
    File mediaStorageDir = new File(
            Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            IMAGE_DIRECTORY_NAME);

    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
                    + IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());

    if (type == MEDIA_TYPE_IMAGE) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
    } else {
        return null;
    }
    Log.e("path", "media file:-" + mediaFile);
    return mediaFile;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);

    Log.e("path", "" + mediaFile.toString());
    String filename = mediaFile.toString();

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;
    Bitmap bitmap = BitmapFactory.decodeFile(filename, options);

    compressImage(bitmap);

}



private void compressImage(Bitmap photo) {
    // TODO Auto-generated method stub
    int imageWidth = photo.getWidth();
    int imageHeight = photo.getHeight();
    long length = mediaFile.length();
    int newHeight = 0;
    int newWidth = 0;

    Toast.makeText(MainActivity.this, "oldwidth="+imageWidth+",oldHeight="+imageHeight,Toast.LENGTH_LONG).show();
    Log.e("Old Image gheight and width---------", imageWidth + "-------"
            + imageHeight + " and Size is -- " + length);
    if (imageHeight > 1500 || imageWidth > 1500) {
        if (imageHeight > imageWidth) {
            Log.e("height is more", "true");
            newHeight = 1200;
            newWidth = (newHeight * imageWidth / imageHeight);
        }
        if (imageWidth > imageHeight) {
            Log.e("width is more", "true");
            newWidth = 1200;
            newHeight = (newWidth * imageHeight / imageWidth);
        }
    }
    Toast.makeText(MainActivity.this, "newwidth="+newWidth+",newHeight="+newHeight,Toast.LENGTH_LONG).show();
    Log.e("new Image gheight and width---------", newHeight + "-------"

android - 上传前压缩相机图像

4 回答 4

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