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[英]How to make a button that sends data via Bluetooth as long as is being pressed Android Studio?
[英]Unable to get bluetooth button pressed in android
我不再能夠確定從我的任何藍牙設備按下了哪個按鈕。
GetParcelableExtra 在 MEDIA_BUTTON 意圖回調中為 KEY_EVENT 返回 null。
此方法工作了幾個月,但突然開始在 GetParcableExtra 上返回 null。
如何從 xamarin 中的后台服務獲取藍牙按鈕事件?
namespace foo
{
[Service]
class BackgroundService : Service
{
[return: GeneratedEnum]
public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
{
registerMediaButtons();
return StartCommandResult.Sticky;
}
private void registerMediaButtons()
{
var am = (AudioManager)this.GetSystemService(AudioService);
var componentName = new ComponentName(PackageName, new MyMediaButtonBroadcastReceiver().ComponentName);
#pragma warning disable CS0618 // Type or member is obsolete
am.UnregisterMediaButtonEventReceiver(componentName);
am.RegisterMediaButtonEventReceiver(componentName);
#pragma warning restore CS0618 // Type or member is obsolete
}
[BroadcastReceiver]
[IntentFilter(new[] { Intent.ActionMediaButton, Intent.ActionHeadsetPlug, AudioManager.ActionAudioBecomingNoisy })]
public class MyMediaButtonBroadcastReceiver : BroadcastReceiver
{
public string ComponentName { get { return Class.Name; } }
public override void OnReceive(Context context, Intent intent)
{
if (intent.Action == Intent.ActionMediaButton)
{
var keyEvent = (KeyEvent)intent.GetParcelableExtra(Intent.ExtraKeyEvent);
if (keyEvent == null)// always null now
return;
if (keyEvent.KeyCode == Keycode.Headsethook)
{
if (keyEvent.Action == KeyEventActions.Down)
{
}
}
}
}
}
}
}
public T getParcelableExtra (String name)
方法在 API 級別 33 中已棄用。這就是您可能無法使用此方法的原因。
它提供了新方法public T getParcelableExtra (String name, Class<T> clazz)
,您可以使用它。 可以參考新的getParcelableExtra 。
另外,我找到了關於Xamarin C# 替代 GetParcelableExtra的問答。
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