C# 在活动之间传递图像
当我按按钮拍照时,我有活动 我也在布局中展示了这张照片 我需要在另一个活动中显示它 这是代码C# 在活动之间传递图像,c#,android,android-intent,xamarin.android,C#,Android,Android Intent,Xamarin.android,当我按按钮拍照时,我有活动 我也在布局中展示了这张照片 我需要在另一个活动中显示它 这是代码 protected override void OnActivityResult(int requestCode, Result resultCode, Intent data) { base.OnActivityResult(requestCode, resultCode, data); Intent mediaScanIntent = new Intent(
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Intent mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
Uri contentUri = Uri.FromFile(App._file);
mediaScanIntent.SetData(contentUri);
SendBroadcast(mediaScanIntent);
int height = Resources.DisplayMetrics.HeightPixels;
int width = _imageView.Height;
App.bitmap = App._file.Path.LoadAndResizeBitmap(width, height);
if (App.bitmap != null)
{
_imageView.SetImageBitmap(App.bitmap);
App.bitmap = null;
}
// Dispose of the Java side bitmap.
GC.Collect();
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
surname_from_activity = Intent.GetStringExtra("Surname");
inn_from_activity = Intent.GetStringExtra("INN");
System.Console.WriteLine(surname_from_activity);
SetContentView(Resource.Layout.qrandphotolayout);
ImageView qr = FindViewById<ImageView>(Resource.Id.qrimage);
if (IsThereAnAppToTakePictures())
{
CreateDirectoryForPictures();
Button button = FindViewById<Button>(Resource.Id.photobutton);
_imageView = FindViewById<ImageView>(Resource.Id.photo);
button.Click += TakeAPicture;
}
Button next = FindViewById<Button>(Resource.Id.sync);
next.Click += delegate {
var intent = new Intent(this, typeof(Badge));
intent.PutExtra("Surname", surname_from_activity);
intent.PutExtra("INN", inn_from_activity);
StartActivity(intent);
};
}
private void CreateDirectoryForPictures()
{
App._dir = new File(
Environment.GetExternalStoragePublicDirectory(
Environment.DirectoryPictures), "CameraAppDemo");
if (!App._dir.Exists())
{
App._dir.Mkdirs();
}
}
private bool IsThereAnAppToTakePictures()
{
Intent intent = new Intent(MediaStore.ActionImageCapture);
IList<ResolveInfo> availableActivities =
PackageManager.QueryIntentActivities(intent, PackageInfoFlags.MatchDefaultOnly);
return availableActivities != null && availableActivities.Count > 0;
}
private void TakeAPicture(object sender, EventArgs eventArgs)
{
Intent intent = new Intent(MediaStore.ActionImageCapture);
App._file = new File(App._dir, String.Format(surname_from_activity + inn_from_activity, Guid.NewGuid()));
intent.PutExtra(MediaStore.ExtraOutput, Uri.FromFile(App._file));
StartActivityForResult(intent,0);
}
}
activityresult上的受保护覆盖无效(int-requestCode、Result-resultCode、Intent数据)
{
base.OnActivityResult(请求代码、结果代码、数据);
Intent mediaScanIntent=新的Intent(Intent.ActionMediaScannerScanFile);
Uri contentUri=Uri.FromFile(App.\u文件);
mediaScanIntent.SetData(contentUri);
SendBroadcast(mediaScanIntent);
int height=Resources.DisplayMetrics.HeightPixels;
int width=_imageView.Height;
App.bitmap=App.\u file.Path.LoadAndResizeBitmap(宽度、高度);
如果(App.bitmap!=null)
{
_设置图像位图(App.bitmap);
App.bitmap=null;
}
//处理Java端位图。
GC.Collect();
}
创建时受保护的覆盖无效(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
姓氏来自于活动=Intent.GetStringExtra(“姓氏”);
inn_from_activity=Intent.GetStringExtra(“inn”);
System.Console.WriteLine(来自_活动的姓_);
SetContentView(Resource.Layout.qrandphotolayout);
ImageView qr=FindViewById(Resource.Id.qrimage);
如果(IsThereAnaptoTakePictures())
{
CreateDirectoryForPictures();
Button Button=FindViewById(Resource.Id.photobutton);
_imageView=findviewbyd(Resource.Id.photo);
按钮。单击+=TakeAPicture;
}
Button next=FindViewById(Resource.Id.sync);
下一步。单击+=委派{
var意向=新意向(此,类型(徽章));
意图。PutExtra(“姓氏”,来自活动的姓氏);
意向。PutExtra(“客栈”,客栈活动);
星触觉(意向);
};
}
私有void CreateDirectoryForPictures()
{
App.\u dir=新文件(
Environment.GetExternalStoragePublicDirectory(
环境(DirectoryPictures),“CameraAppDemo”);
如果(!App.\u dir.Exists())
{
App._dir.Mkdirs();
}
}
私人书房在这里拍摄照片()
{
意向意向=新意向(MediaStore.ActionImageCapture);
IList可用性=
PackageManager.QueryInputActivities(intent,PackageInfoFlags.MatchDefaultOnly);
return availableActivities!=null&&availableActivities.Count>0;
}
私有void TakeAPicture(对象发送方,EventArgs EventArgs)
{
意向意向=新意向(MediaStore.ActionImageCapture);
App._file=新文件(App._dir,String.Format(来自_activity的姓_+来自_activity的inn_,Guid.NewGuid());
intent.PutExtra(MediaStore.ExtraOutput,Uri.FromFile(App._文件));
StartActivityForResult(意向,0);
}
}
我需要将图像传递给另一个活动并在ImageView中显示它
我怎么能做到
非常感谢您各种可能性:
- 您可以在ActivityB中创建静态atribute,在从ActivityA调用ActivityB之前,您应该将imageView/URI传递给创建的atribute
- 您可以在文件夹temp(ActivityB)中传递保存图像,并在ActivityB中获取此图像
Intent intent = new Intent(this, TwoActivity.class);
Bitmap bitmap;
ByteArrayOutputStream bs = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
i.putExtra("byte", bs.toByteArray());
startActivity(i);
if(getIntent().hasExtra("byte")) {
ImageView imv= new ImageView(this);
Bitmap bitmap = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byte"),0,getIntent().getByteArrayExtra("byte").length);
imv.setImageBitmap(bitmap);
}
接收器活动
Intent intent = new Intent(this, TwoActivity.class);
Bitmap bitmap;
ByteArrayOutputStream bs = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
i.putExtra("byte", bs.toByteArray());
startActivity(i);
if(getIntent().hasExtra("byte")) {
ImageView imv= new ImageView(this);
Bitmap bitmap = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byte"),0,getIntent().getByteArrayExtra("byte").length);
imv.setImageBitmap(bitmap);
}
无需将图像从一个活动传递到另一个活动,而是在活动之间传递图像的路径尝试在第二个活动
photo.SetImageBitmap(qrandcameraactivity.App.bitmap)中写入该路径代码>无效