在我的应用中，我需要使用动作。此操作的原因是，在这种情况下，我可以使用 Pro摄像机模式，例如手动ISO，曝光时间等，同时使用动作
Intent Filter action_new_picture 我也能够捕捉照片的照片拍摄。
我需要的是一旦拍摄照片，就可以将内置的相机活动隐藏在广播接收器的 OnReceive 方法中。到目前为止，我尝试的是，我通过指定意图动作标志flag_activitivity_reorder_to_front和flag_activitivitive_single_top以这种方式（一个C＃语言代码段，但几乎与Java相同），从OnReceive中调用了我的活动：
public override void OnReceive(Context context, Intent intent) {
Toast.MakeText(context, $"Data1: {intent.DataString}", ToastLength.Short).Show();
var path = Path.Combine(context.CacheDir.AbsolutePath, $"Photo_{DateTime.Now.ToString("yyyyMMMdd_HHmmss")}.jpg");
try {
// copy the photo to app cache dir
using (var outs = File.Create(path)) {
using (var ins = context.ContentResolver.OpenInputStream(intent.Data)) {
ins.Seek(0, SeekOrigin.Begin);
ins.CopyTo(outs);
}
}
var a = Xamarin.Essentials.Platform.CurrentActivity;
var tvInfo = a.FindViewById<AppCompatTextView>(Resource.Id.tvInfo);
tvInfo.Append("Picture was taken and saved to:");
tvInfo.Append($"{path}{SysEnv.NewLine}{SysEnv.NewLine}");
// hide the builtin camera's Activity by brining my Activity to top
var i = new Intent(context, typeof(MainActivity)).SetFlags(ActivityFlags.ReorderToFront | ActivityFlags.SingleTop);
a.StartActivity(i);
}
catch (Exception ex) {
Toast.MakeText(context, $"Error: {ex.Message}", ToastLength.Short).Show();
}
}
这是我如何启动相机的
var btnTake = FindViewById<AppCompatButton>(Resource.Id.btnTake);
btnTake.Click += (s, e) => {
var i = new Intent(MediaStore.IntentActionStillImageCamera);
var r = i.ResolveActivity(this.PackageManager);
if (r != null) {
StartActivity(i);
}
};
问题 ：是它仅在第一次尝试中起作用，这意味着我单击应用程序的按钮，内置相机启动。当我拍照时，将图片保存并复制到我的应用程序的Cache Dir中，内置相机的活动消失了，并且我的活动出现了。
但是在第二次尝试中，我的活动没有出现，而Bulti-In相机的活动则停留在顶部。
有什么想法，如何隐藏或关闭内置相机的活动？
In my app, I need to start the built-in camera application using the action INTENT_ACTION_STILL_IMAGE_CAMERA. The reason of this action is that in this case, I can use the Pro camera mode, like manual ISO, exposure time, etc., while using the action ACTION_IMAGE_CAPTURE this is not possible (at least for the builtin camera app for my Samsung Galaxy S20+ device)
Using the broadcast receiver intent filter ACTION_NEW_PICTURE I am also able to catch the URI of the photo taken.
What I need is to hide the built-in camera Activity from the broadcast receiver's OnReceive method, once the photo was taken. What I tried so far is that I called my Activity from OnReceive by specifying the intent action flags FLAG_ACTIVITY_REORDER_TO_FRONT and FLAG_ACTIVITY_SINGLE_TOP this way (a C# language snippet, but almost identical to Java):
public override void OnReceive(Context context, Intent intent) {
Toast.MakeText(context, quot;Data1: {intent.DataString}", ToastLength.Short).Show();
var path = Path.Combine(context.CacheDir.AbsolutePath, quot;Photo_{DateTime.Now.ToString("yyyyMMMdd_HHmmss")}.jpg");
try {
// copy the photo to app cache dir
using (var outs = File.Create(path)) {
using (var ins = context.ContentResolver.OpenInputStream(intent.Data)) {
ins.Seek(0, SeekOrigin.Begin);
ins.CopyTo(outs);
}
}
var a = Xamarin.Essentials.Platform.CurrentActivity;
var tvInfo = a.FindViewById<AppCompatTextView>(Resource.Id.tvInfo);
tvInfo.Append("Picture was taken and saved to:");
tvInfo.Append(quot;{path}{SysEnv.NewLine}{SysEnv.NewLine}");
// hide the builtin camera's Activity by brining my Activity to top
var i = new Intent(context, typeof(MainActivity)).SetFlags(ActivityFlags.ReorderToFront | ActivityFlags.SingleTop);
a.StartActivity(i);
}
catch (Exception ex) {
Toast.MakeText(context, quot;Error: {ex.Message}", ToastLength.Short).Show();
}
}
Here is how I start the camera:
var btnTake = FindViewById<AppCompatButton>(Resource.Id.btnTake);
btnTake.Click += (s, e) => {
var i = new Intent(MediaStore.IntentActionStillImageCamera);
var r = i.ResolveActivity(this.PackageManager);
if (r != null) {
StartActivity(i);
}
};
The problem with the above is that it works only on the first attempt, which means I click on my app's button, the built-in camera starts. When I take a picture, the picture is saved and copied to my app's cache dir, the built-in camera's Activity disappears and my Activity appears.
But on the second attempt, my activity does not appear and the bulti-in camera's Activity stays on top.
Any idea, how to hide or close the built-in camera's Activity?
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感谢@davidwasser终于有效！！！
解决方案是从其 oncreate（）中添加新的虚拟 castive finish（），并最终从广播接收者的 onreceive（ ）：
Thanks to @DavidWasser finally it works!!!
Solution is to add a new dummy activity calling Finish() from its OnCreate() and finally call following from broadcast receiver's OnReceive():