Question

我使用我的Android应用程序从库中选择了图像并保存在Environment目录中，而不对其进行任何处理。原始图像大小为1.4 Mb，但新保存的图像大小超过4 Mb。我使用的代码如下。

case REQUEST_CODE_FROM_GALLERY:
            String datastring1=data.getDataString();
            Uri uri = data.getData();
            Bitmap bitmap = null;
            try {
                bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
                Log.e("..............",bitmap.getHeight()+","+bitmap.getWidth());
            } catch (IOException e) {
                e.printStackTrace();
            }
            storeImage(bitmap);

            break;

private boolean storeImage(Bitmap image) {
    File pictureFile = createDir(MEDIA_TYPE_IMAGE);
    try {
        FileOutputStream fileOutputStream = new FileOutputStream(pictureFile);
        image.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);
        fileOutputStream.flush();
        fileOutputStream.close();
        return true;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}

private File createDir(int type) {
    File file;
    File filedir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "EffitientImageLoading");
    if (!filedir.exists()) {
        if (!filedir.mkdir())
            Toast.makeText(this, "Directory could not be created!! Try Again"
                    , Toast.LENGTH_LONG).show();
    }
    String timestamp = new SimpleDateFormat("ddmmyy_hhmmss").format(new Date());
    if (type == MEDIA_TYPE_IMAGE) {
        file = new File(filedir.getPath() + File.separator +
                "IMG_" + timestamp + ".png");
    } else {
        return null;
    }
    currentphotopath = "file:" + file.getAbsolutePath();
    return file;
}

Answer 1

实际上您使用.PNG文件格式来保存图像，但它是一种无损格式，无法压缩图像大小。我正在为您的代码添加一些更正，如果您发现图像大小发生任何变化，请使用它并还原我。

case REQUEST_CODE_FROM_GALLERY:
            String datastring1=data.getDataString();
            Uri uri = data.getData();
            Bitmap bitmap = null;
            try {
                bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
                Log.e("..............",bitmap.getHeight()+","+bitmap.getWidth());
            } catch (IOException e) {
                e.printStackTrace();
            }
            storeImage(bitmap);

            break;

private boolean storeImage(Bitmap image) {
    File pictureFile = createDir(MEDIA_TYPE_IMAGE);
    try {
        FileOutputStream fileOutputStream = new FileOutputStream(pictureFile);
        image.compress(Bitmap.CompressFormat.JPEG, 70, fileOutputStream);
        fileOutputStream.flush();
        fileOutputStream.close();
        return true;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}

private File createDir(int type) {
    File file;
    File filedir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "EffitientImageLoading");
    if (!filedir.exists()) {
        if (!filedir.mkdir())
            Toast.makeText(this, "Directory could not be created!! Try Again"
                    , Toast.LENGTH_LONG).show();
    }
    String timestamp = new SimpleDateFormat("ddmmyy_hhmmss").format(new Date());
    if (type == MEDIA_TYPE_IMAGE) {
        file = new File(filedir.getPath() + File.separator +
                "IMG_" + timestamp + ".JPEG");
    } else {
        return null;
    }
    currentphotopath = "file:" + file.getAbsolutePath();
    return file;
}

Answer 2

如果要复制拾取的图像，请打开获取的uri的输入流和文件路径的文件输出流。然后在循环chuncks中从输入流中读取并将它们写入文件输出流。正常副本。

InputStream is = getContentResolver().openInputStrea(data.getData());

FileOutputStream fos = new FileOutputStrea(path);

Answer 3

你可以降低图像的质量 -

 image.compress(Bitmap.CompressFormat.JPEG, 60, fileOutputStream);

以60％的质量保存您的图像。

保存解压缩的图像会占用空间。

保存的图像大于我从图库中选取的图像

3 个答案: