[英]Detect if flash light is already turned on
我有一個帶有簡單切換開關的應用程序,可以打開和關閉手電筒,我需要可以用來檢查手電筒是否已經打開的代碼,然后使用它來更改開關的切換狀態......如果服務報告打開手電筒,我將發送一個廣播意圖將其關閉,反之亦然......我的應用程序邏輯在這里
class SecondActivity : AppCompatActivity{
protected override void OnCreate(Bundle onSavedInstanceState){
//Switch definition
Switch switch1 = this.FindViewById<Switch>(Resource.Id.switch2);
//Setting the intial status of the switch to be unchecked by default
switch1.Checked=false;
//Adding delegate method to handle switch checked event
switch1.CheckedChange += delegate (object sender, CompoundButton.CheckedChangeEventArgs e)
{
if (e.IsChecked==true)
{
//Switch is on so turn on Flahlight
Flashlight.TurnOnAsync();
Toast.MakeText(Application.Context, "Switch is ON", ToastLength.Long).Show();
}
else
{
//Switch is unchecked so turn off flashlight
Flashlight.TurnOffAsync();
Toast.MakeText(Application.Context, "Switch is OFF", ToastLength.Long).Show();
}
};
//Code to check if flashlight was turned on by an extra app activity
}
}
用戶可以在應用程序外打開手電筒,所以我只需要該代碼來檢查它是否已經打開,然后我將實施廣播意圖以適當地更改我的開關,感謝您的時間和貢獻
用戶可以在應用程序外打開手電筒,所以我只需要該代碼來檢查它是否已經打開,然后我將實施廣播意圖以適當地更改我的開關,
你想達到如下gif的效果嗎?
我寫了兩個應用來實現:
MyForegroundServiceDemo:無論是否啟用,使用廣播來監控flashlight
,為了讓廣播接收器始終運行在后台或前台,我使用了 forground 服務來實現它。 然后在前台服務中注冊broadcastRecevier。
XAndroidBroadcastRece:只需打開/關閉手電筒。
這是我的 MyForegroundServiceDemo 代碼。
首先,您需要在AndroidManifest.xml
添加和 Grand Camera& Flashlightpermission。
然后,這是我的 layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="Please see following switch"/>
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch1"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button1"
android:text="start"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="Stop"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="123@456"/>
</LinearLayout>
這是我的MainActivity.cs
。 我使用Button1
來啟用前台服務。 並在broadcastReceiver中暴露我們可以控制它的Switch
。
[Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
public class MainActivity : AppCompatActivity
{
public static MainActivity Instance;
public static Switch switch1;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
Instance = this;
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
Button button1 = FindViewById<Button>(Resource.Id.button1);
Button button2 = FindViewById<Button>(Resource.Id.button2);
switch1 = FindViewById<Switch>(Resource.Id.switch1);
button2.Click += Button2_Click;
button1.Click += Button1_Click;
}
Intent intent;
private void Button2_Click(object sender, System.EventArgs e)
{
// throw new System.NotImplementedException();
Android.App.Application.Context.StopService(intent);
}
private void Button1_Click(object sender, System.EventArgs e)
{
intent = new Intent(Android.App.Application.Context, typeof(MyForegroundService));
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.O)
{
StartForegroundService(intent);
// Android.App.Application.Context.StartForegroundService(intent);
}
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
以下是有關的代碼MyForegroundService.cs
。當我們接收器廣播在MyReceiver(BroadcastReceiver)
,我們mintor手電筒與地位MyTorchRegister
using Android.Hardware.Camera2;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Essentials;
namespace ForegroundServiceDemo
{
[Service]
class MyForegroundService : Service
{
public const int SERVICE_RUNNING_NOTIFICATION_ID = 10000;
[return: GeneratedEnum]
public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
{
CreateNotificationChannel();
string messageBody = "service starting";
Clipboard.ClipboardContentChanged += Clipboard_ClipboardContentChanged;
// / Create an Intent for the activity you want to start
Intent resultIntent = new Intent(this,typeof(Activity1));
// Create the TaskStackBuilder and add the intent, which inflates the back stack
TaskStackBuilder stackBuilder = TaskStackBuilder.Create(this);
stackBuilder.AddNextIntentWithParentStack(resultIntent);
// Get the PendingIntent containing the entire back stack
PendingIntent resultPendingIntent = stackBuilder.GetPendingIntent(0, PendingIntentFlags.UpdateCurrent);
var notification = new Notification.Builder(this, "10111")
.SetContentIntent(resultPendingIntent)
.SetContentTitle("Foreground")
.SetContentText(messageBody)
.SetSmallIcon(Resource.Drawable.main)
.SetOngoing(true)
.Build();
StartForeground(SERVICE_RUNNING_NOTIFICATION_ID, notification);
MyReceiver receiver = new MyReceiver();
RegisterReceiver(receiver, new IntentFilter("com.Java_Tutorial.CUSTOM_INTENT"));
return StartCommandResult.Sticky;
}
private async void Clipboard_ClipboardContentChanged(object sender, EventArgs e)
{
//throw new NotImplementedException();
var text = await Clipboard.GetTextAsync();
Toast.MakeText(this, text, ToastLength.Long).Show();
if (text.Contains("@"))
{
await Clipboard.SetTextAsync(text.Replace("@", ""));
}
}
public override void OnDestroy()
{
base.OnDestroy();
Clipboard.ClipboardContentChanged -= Clipboard_ClipboardContentChanged;
StopForeground(true);
}
public override IBinder OnBind(Intent intent)
{
return null;
}
void CreateNotificationChannel()
{
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
{
return;
}
var channelName = Resources.GetString(Resource.String.channel_name);
var channelDescription = GetString(Resource.String.channel_description);
var channel = new NotificationChannel("10111", channelName, NotificationImportance.Default)
{
Description = channelDescription
};
var notificationManager = (NotificationManager)GetSystemService(NotificationService);
notificationManager.CreateNotificationChannel(channel);
}
}
//do you work
[BroadcastReceiver(Enabled = true, Exported = true)]
public class MyReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
CameraManager cameraManager = (CameraManager)context.GetSystemService(Context.CameraService);
var flashAvailable = cameraManager.GetCameraCharacteristics("0").Get(CameraCharacteristics.FlashInfoAvailable);
cameraManager.RegisterTorchCallback(new MyTorchRegister(), null);
if (MyTorchRegister.isFlashlightOn) {
MainActivity.switch1.Checked = false;
// Toast.MakeText(context, "FlashLight is disabled", ToastLength.Long).Show();
}
else
{
MainActivity.switch1.Checked = true;
// Toast.MakeText(context, "FlashLight is Opened", ToastLength.Long).Show();
}
}
internal class MyTorchRegister : CameraManager.TorchCallback
{
public static bool isFlashlightOn = false;
public override void OnTorchModeChanged(string cameraId, bool enabled)
{
base.OnTorchModeChanged(cameraId, enabled);
isFlashlightOn = enabled;
}
}
}
}
這是 XAndroidBroadcastRece 演示代碼
Switch switch1 = this.FindViewById<Switch>(Resource.Id.switch1);
//Setting the intial status of the switch to be unchecked by default
switch1.Checked = false;
//Adding delegate method to handle switch checked event
switch1.CheckedChange += delegate (object sender, CompoundButton.CheckedChangeEventArgs e)
{
if (e.IsChecked == true)
{
//Switch is on so turn on Flahlight
Flashlight.TurnOnAsync();
Intent intent = new Intent();
intent.SetAction("com.Java_Tutorial.CUSTOM_INTENT");
SendBroadcast(intent);
Toast.MakeText(Application.Context, "Switch is ON", ToastLength.Long).Show();
}
else
{
//Switch is unchecked so turn off flashlight
Flashlight.TurnOffAsync();
Intent intent = new Intent();
intent.SetAction("com.Java_Tutorial.CUSTOM_INTENT");
SendBroadcast(intent);
Toast.MakeText(Application.Context, "Switch is OFF", ToastLength.Long).Show();
}
};
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