在将照片上传到服务器之前,先减小Android中的照片大小
在将照片上传到服务器之前,先减小Android中的照片大小,android,image,Android,Image,在将照片上传到服务器之前,我想减小android中的照片大小。如何在不影响图像优化的情况下实现这一点? 我还想允许用户裁剪图像,所以我找到了一些教程,但通过评论,我知道用户在一些android版本中会出错。那么,是否有任何方法允许用户裁剪在所有android版本中都可用的图像。试试这个,它对我有用: private Bitmap getBitmap(String path) { Uri uri = getImageUri(path); InputStream in = null; try {
在将照片上传到服务器之前,我想减小android中的照片大小。如何在不影响图像优化的情况下实现这一点?
我还想允许用户裁剪图像,所以我找到了一些教程,但通过评论,我知道用户在一些android版本中会出错。那么,是否有任何方法允许用户裁剪在所有android版本中都可用的图像。试试这个,它对我有用:
private Bitmap getBitmap(String path) {
Uri uri = getImageUri(path);
InputStream in = null;
try {
final int IMAGE_MAX_SIZE = 1200000; // 1.2MP
in = mContentResolver.openInputStream(uri);
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, o);
in.close();
int scale = 1;
while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) >
IMAGE_MAX_SIZE) {
scale++;
}
Log.d(TAG, "scale = " + scale + ", orig-width: " + o.outWidth + ",
orig-height: " + o.outHeight);
Bitmap b = null;
in = mContentResolver.openInputStream(uri);
if (scale > 1) {
scale--;
// scale to max possible inSampleSize that still yields an image
// larger than target
o = new BitmapFactory.Options();
o.inSampleSize = scale;
b = BitmapFactory.decodeStream(in, null, o);
// resize to desired dimensions
int height = b.getHeight();
int width = b.getWidth();
Log.d(TAG, "1th scale operation dimenions - width: " + width + ",
height: " + height);
double y = Math.sqrt(IMAGE_MAX_SIZE
/ (((double) width) / height));
double x = (y / height) * width;
Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x,
(int) y, true);
b.recycle();
b = scaledBitmap;
System.gc();
} else {
b = BitmapFactory.decodeStream(in);
}
in.close();
Log.d(TAG, "bitmap size - width: " +b.getWidth() + ", height: " +
b.getHeight());
return b;
} catch (IOException e) {
Log.e(TAG, e.getMessage(),e);
return null;
}
在从设备的多媒体资料中拾取图像时,请使用以下代码裁剪并缩小图像的大小
Intent photoPickerIntent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// photoPickerIntent.setType("image/*");
photoPickerIntent.putExtra("crop", "true");
photoPickerIntent.putExtra("outputX", 512);
photoPickerIntent.putExtra("outputY", 512);
photoPickerIntent.putExtra("aspectX", 1);
photoPickerIntent.putExtra("aspectY", 1);
photoPickerIntent.putExtra("scale", true);
File f = new File(android.os.Environment
.getExternalStorageDirectory(), "tt.jpg");
希望有帮助..快乐编码:)公共位图解码和大小文件(文件f){
试一试{
//解码图像大小
BitmapFactory.Options o=新的BitmapFactory.Options();
o、 inJustDecodeBounds=true;
解码流(新的FileInputStream(f),null,o);
//我们要扩展到的新尺寸
所需的最终int_尺寸=70;
//找到正确的刻度值。它应该是2的幂。
内部宽度=o.向外宽度,高度=o.向外高度;
int标度=1;
while(true){
如果(宽度\u tmp/2<要求的\u尺寸
||高度(tmp/2<所需尺寸)
打破
宽度_tmp/=2;
高度_tmp/=2;
比例*=2;
}
BitmapFactory.Options o2=新的BitmapFactory.Options();
o2.inSampleSize=刻度;
返回BitmapFactory.decodeStream(新文件输入流(f),null,o2);
}catch(filenotfounde异常){
}
返回null;
}
将位图对象转换为file on=bject并使用以下命令:->
File File=新文件(“位图路径”);
位图bmpp=解码文件(文件);
public Bitmap decodeAndResizeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 70;
// 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;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
return null;
}
convert your bitmap object to file on=bject and use these ::->
File file = new File("your bitmap path ");
Bitmap bmpp = decodeAndResizeFile(file);