如何使用c#从android相机中获取图像或位图
本文关键字:获取 图像 位图 相机 何使用 android | 更新日期: 2023-09-27 18:28:39
我可以使用下面的代码获得图像。拍完照片后,我想把图像变成byte[]
。我一直在思考的问题是,拍完照片后,我应该如何获取图像?
Intent
是我用来打开相机的意图,但我不确定是否有什么可以覆盖的东西,或者意图是否仍然有我的image/bitmap
,所以我可以将其分解。
[Activity(Label = "CameraPage")]
public class PhotoTaker : Activity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.CameraView);
ImageButton button = FindViewById<ImageButton>(Resource.Id.imagebutton);
button.Click += BtnCameraClick;
}
private string _imageUri;
private Intent intent;
private Boolean isMounted
{
get
{
return Android.OS.Environment.ExternalStorageState.Equals(Android.OS.Environment.MediaMounted);
}
}
public void BtnCameraClick(object sender, EventArgs eventArgs)
{
var uri = ContentResolver.Insert(isMounted
? MediaStore.Images.Media.ExternalContentUri
: MediaStore.Images.Media.InternalContentUri, new ContentValues());
_imageUri = uri.ToString();
intent = new Intent(MediaStore.ActionImageCapture);
//bitmap = MediaStore.Images.Media.GetBitmap(ContentResolver, uri);
intent.PutExtra(MediaStore.ExtraOutput, uri);
StartActivityForResult(intent, 1001);
}
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
if (resultCode == Result.Ok && requestCode == 1001)
{
Toast.MakeText(this, string.Format("Image URI is {0}", _imageUri), ToastLength.Short).Show();
Android.Content.Intent temp = new Intent(this, typeof(PayeeInformationViewModel));
StartActivity(temp);
//this.byteArr = this.bitmap.GetNinePatchChunk();
// byteArr = intent.GetByteArrayExtra(_imageUri);
// GetFileStreamPath(this._imageUri);
//var firstArr = string.Empty;
//if (byteArr.Length > 5)
//{
// foreach (byte b in byteArr)
// {
// firstArr += b.ToString();
// if (firstArr.Length > 5)
// {
// break;
// }
// }
//}
//else
//{
// firstArr = "Small";
//}
// Toast.MakeText(this, firstArr, ToastLength.Short).Show();
// MemoryStream stream = new MemoryStream(byteArr);
}
}
}
以下是如何将图像转换为字节[]
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
if (resultCode == Result.Ok && requestCode == 1001)
{
Android.Net.Uri _currentImageUri = Android.Net.Uri.Parse(_imageUri);
Bitmap bitmap = BitmapFactory.DecodeStream(ContentResolver.OpenInputStream(_currentImageUri));
byte[] bitmapData = null;
using (MemoryStream stream = new MemoryStream())
{
bitmap.Compress(Bitmap.CompressFormat.Png, 0, stream);
bitmapData = stream.ToArray();
}
bitmap.Dispose();
}
}