我有這個Xamarin Android 應用程序（不是 Forms），它可以打開相機并讓我拍照并隨拍或拍一張新照片。之后，ImageView使用位圖向我展示應用程序上的圖片。我無法使用位圖保存到畫廊（我不知道該怎么做，或者是否有更簡單的方法）。我需要應用程序獲取應用程序拍攝的最后一張照片（為什么需要保存它）并通過單擊按鈕將其發送到服務器（我也需要一些幫助）。這就是我需要做的。這是代碼MainActivity.cs：using Android.App;using Android.Widget;using Android.OS;using Android.Content;using Android.Provider;using Android.Runtime;using Android.Graphics;namespace CameraApp{ [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)] public class MainActivity : Activity { ImageView imageView; protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); SetContentView(Resource.Layout.activity_main); Button btnCamera = FindViewById<Button>(Resource.Id.btnCamera); imageView = FindViewById<ImageView>(Resource.Id.imageView); btnCamera.Click += BtnCamera_Click; } protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data) { base.OnActivityResult(requestCode, resultCode, data); Bitmap bitmap = (Bitmap)data.Extras.Get("data"); imageView.SetImageBitmap(bitmap); } private void BtnCamera_Click(object sender, System.EventArgs e) { Intent intent = new Intent(MediaStore.ActionImageCapture); StartActivityForResult(intent, 0); } }}
2 回答
撒科打諢
TA貢獻1934條經驗 獲得超2個贊
我寫了一個關于你的需求的演示。我添加了相機和外部存儲權限并將圖像存儲到畫廊，這里正在運行 GIF。
https://i.stack.imgur.com/FPLUY.gif
有運行demo的代碼。我添加了運行時權限（相機和WriteExternalStorage）請求。并判斷用戶沒有拍照的情況，然后返回應用程序。
[Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
public class MainActivity : AppCompatActivity, ActivityCompat.IOnRequestPermissionsResultCallback
{
Button button1;
ImageView imageView1;
View layout;
static readonly int REQUEST_CAMERA_WriteExternalStorage = 0;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
layout = FindViewById<RelativeLayout>(Resource.Id.sample_main_layout);
button1 = FindViewById<Button>(Resource.Id.button1);
imageView1 = FindViewById<ImageView>(Resource.Id.imageView1);
button1.Click += (o, e) =>
{
CheckPermission();
};
}
public void CheckPermission()
{
if ((ContextCompat.CheckSelfPermission(this, Manifest.Permission.Camera) == (int)Permission.Granted)&& (ContextCompat.CheckSelfPermission(this, Manifest.Permission.WriteExternalStorage) == (int)Permission.Granted))
{
// Camera and store permission has been granted
ShowCamera();
}
else
{
// Camera and store permission has not been granted
RequestPermission();
}
}
private void RequestPermission()
{
ActivityCompat.RequestPermissions(this, new String[] { Manifest.Permission.Camera, Manifest.Permission.WriteExternalStorage }, REQUEST_CAMERA_WriteExternalStorage);
}
//get result of persmissions
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Permission[] grantResults)
{
if (requestCode == REQUEST_CAMERA_WriteExternalStorage)
{
if ( PermissionUtil.VerifyPermissions(grantResults))
{
// All required permissions have been granted, display Camera.
ShowCamera();
}
else
{
// permissions did not grant, push up a snackbar to notificate USERS
Snackbar.Make(layout, Resource.String.permissions_not_granted, Snackbar.LengthShort).Show();
}
}
else
{
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void ShowCamera()
{
Intent intent = new Intent(MediaStore.ActionImageCapture);
StartActivityForResult(intent, 0);
}
protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Bitmap bitmap=null;
//If user did not take a photeo , he will get result of bitmap, it is null
try {
bitmap = (Bitmap)data.Extras.Get("data");
} catch(Exception e)
{
Log.Error("TakePhotoDemo1", e.Message);
Toast.MakeText(this, "You did not take a photo", ToastLength.Short).Show();
}
if (bitmap != null)
{
MediaStore.Images.Media.InsertImage(ContentResolver, bitmap, "screen", "shot");
imageView1.SetImageBitmap(bitmap);
}
else
{
Toast.MakeText(this, "You did not take a photo", ToastLength.Short).Show();
}
}
}
PermissionUtil.cs通過驗證給定數組中的每個條目是否具有值 Permission.Granted，檢查是否已授予所有給定權限。
public abstract class PermissionUtil
{
public static bool VerifyPermissions(Permission[] grantResults)
{
// At least one result must be checked.
if (grantResults.Length < 1)
return false;
// Verify that each required permission has been granted, otherwise return false.
foreach (Permission result in grantResults)
{
if (result != Permission.Granted)
{
return false;
}
}
return true;
}
}
有我的代碼。
https://github.com/851265601/TakePhotoDemo1
MediaStore.Images.Media.InsertImage前面的代碼將在 gallery( )的末尾添加圖像。如果您想修改日期以使其出現在開頭或任何其他元數據中，請參閱此鏈接。 https://gist.github.com/samkirton/0242ba81d7ca00b475b9
神不在的星期二
TA貢獻1963條經驗 獲得超6個贊
您可以通過 MediaStore 插入圖像
MediaStore.Images.Media.InsertImage(this, yourBitmap, yourTitle, yourDescription);
注意：您可能想為此添加寫入外部存儲權限。
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