在Android的图片库缩放选定的图像 [英] Scale selected image in Android image gallery
问题描述
我有一个关于按比例缩小的图片库选择的图像，这样我就可以通过PHP把它上传到服务器的问题。
I have a question regarding scaling down the selected image in image gallery so i can upload it to a server via php.
所以动作的顺序是：
1）获取选定的图像从画廊（DONE）
1)Get selected image from gallery (DONE)
2）规模下来，COM preSS它JPG（GOT stucked这里）
2)Scale it down and compress it to jpg (Got stucked here)
3）上传到服务器异步（DONE）
3)Upload to server async(DONE)
我需要连接1和第3 step.So到目前为止，我已经做到了这一点：
I need to connect 1st and 3rd step.So far i have done this:
获取所选图像：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
Bitmap yourSelectedImage = BitmapFactory.decodeFile(picturePath);
new async_upload().execute(picturePath.toString());
}
}
异步上传：
public class async_upload extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... arg0) {
uploadFile(arg0[0]);
return "asd";
}
@Override
protected void onPostExecute(String result) {
}
}
public int uploadFile(String sourceFileUri) {
..............Code for uploading works.......
}
和我的功能，缩小图像。
And my function for scaling down the image.
private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 640;
// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE) {
break;
}
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o2);
}
正如你可以看到我发送所选图像的URI来 uploadFile 来上传异步。
我的问题是我怎么能做副本选择的图像，COM preSS /规模和发送的原始这一形象来代替。当然，我不希望改变用户的形象......但送缩放版本。
As you can see i am sending the URI of the selected image to uploadFile to be uploaded async.
My problem is how can i "make a copy" of the selected image,compress/scale and send this image instead of the original one. Of course i dont want to alter the user's images...but send a scaled version.
任何想法？ 谢谢！
推荐答案
您可以做这些方针的东西
you can do something along these lines
File pngDir = new File(Environment.getExternalStorageDirectory(),"PicUploadTemp");
if (!pngDir.exists()) {
pngDir.mkdirs();
}
pngfile = new File(pngDir,"texture1.jpg");
FileOutputStream fOut;
try {
fOut = new FileOutputStream(pngfile);
finalbitmap.compress(Bitmap.CompressFormat.JPG, 100,fOut);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
pngUri = Uri.fromFile(pngfile);
为code你把第一个这种方法添加到您的类
for the code you put up first add this method to your class
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
那么，你只要把你的code，像这样
then in your code that you just put up, do it like this
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(picturePath, options);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;
String imageType = options.outMimeType;
options.inSampleSize = calculateInSampleSize(options,512,256);//512 and 256 whatever you want as scale
options.inJustDecodeBounds = false;
Bitmap yourSelectedImage = BitmapFactory.decodeFile(selectedImagePath,options);
//Bitmap yourSelectedImage = BitmapFactory.decodeFile(picturePath);
File pngDir = new File(Environment.getExternalStorageDirectory(),"PicUploadTemp");
if (!pngDir.exists()) {
pngDir.mkdirs();
}
File pngfile = new File(pngDir,"texture1.jpg");
FileOutputStream fOut;
try {
fOut = new FileOutputStream(pngfile);
yourSelectedImage.compress(Bitmap.CompressFormat.JPEG, 50,fOut);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new async_upload().execute(pngfile.getPath().toString());
yourSelectedImage.recycle();
resizedBitmap.recycle();
Log.d("INTERNET", yourSelectedImage.toString());
这篇关于在Android的图片库缩放选定的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
