[英]Getting smaller size of image when captured from camera in Android
在我的Android應用程序中,當我從相機捕獲圖像時,我想調整其尺寸。 當我從圖庫中拍攝圖像時,可以成功調整尺寸。 但是,當我從相機捕獲時,我失敗了。 請幫忙
if (requestCode == take_image && resultCode == RESULT_OK && null != data) {
thumbnail = (Bitmap) data.getExtras().get("data");
image2 = me1;
addattachmentsToListView(image2);
}
這是從sdcard調整圖像大小的代碼:
if (requestCode == UploadFile && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
try {
Bitmap image=(decodeUri(selectedImage));
addattachmentsToListView(image);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(
getContentResolver().openInputStream(selectedImage), null, o);
final int REQUIRED_SIZE = 200;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 1.5 < REQUIRED_SIZE || height_tmp / 1.5 < REQUIRED_SIZE) {
break;
}
width_tmp /= 4;
height_tmp /= 4;
// width_tmp = 20;
// height_tmp = 20;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(
getContentResolver().openInputStream(selectedImage), null, o2);
}
在您的public void onPreviewFrame(byte[] data, Camera camera)
,您可以通過以下方式獲得位圖:
Bitmap bmp = YUVtoBMP(data, ImageFormat.NV21, YOUR_CAMERA_SIZE);
public Bitmap YUVtoBMP(byte[] data, int format, Camera.Size size)
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
YuvImage yuvImage = new YuvImage(data, format, size.width, size.height, null);
yuvImage.compressToJpeg(new Rect(0, 0, size.width, size.height), 50, out);
byte[] imageBytes = out.toByteArray();
Options options = new Options();
options.inPreferQualityOverSpeed = false;
Bitmap image = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, options);
return image;
}
為了縮放位圖,您可以:
Bitmap scaled = Bitmap.createScaledBitmap(bmp, NEW_WIDTH, NEW_HEIGHT, true);
這只是一個提示:從此開始並嘗試尋找優化(如果有)。
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