diff options
| -rw-r--r-- | core/java/android/nfc/NfcAdapter.java | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/core/java/android/nfc/NfcAdapter.java b/core/java/android/nfc/NfcAdapter.java index ea8d38013edb..1bb44af81cec 100644 --- a/core/java/android/nfc/NfcAdapter.java +++ b/core/java/android/nfc/NfcAdapter.java @@ -26,6 +26,8 @@ import android.annotation.SdkConstant.SdkConstantType; import android.annotation.SystemApi; import android.annotation.UserIdInt; import android.app.Activity; +import android.app.ActivityThread; +import android.app.OnActivityPausedListener; import android.app.PendingIntent; import android.compat.annotation.UnsupportedAppUsage; import android.content.Context; @@ -1575,11 +1577,17 @@ public final class NfcAdapter { if (activity == null || intent == null) { throw new NullPointerException(); } + if (!activity.isResumed()) { + throw new IllegalStateException("Foreground dispatch can only be enabled " + + "when your activity is resumed"); + } try { TechListParcel parcel = null; if (techLists != null && techLists.length > 0) { parcel = new TechListParcel(techLists); } + ActivityThread.currentActivityThread().registerOnActivityPausedListener(activity, + mForegroundDispatchListener); sService.setForegroundDispatch(intent, filters, parcel); } catch (RemoteException e) { attemptDeadServiceRecovery(e); @@ -1607,8 +1615,25 @@ public final class NfcAdapter { throw new UnsupportedOperationException(); } } + ActivityThread.currentActivityThread().unregisterOnActivityPausedListener(activity, + mForegroundDispatchListener); + disableForegroundDispatchInternal(activity, false); + } + + OnActivityPausedListener mForegroundDispatchListener = new OnActivityPausedListener() { + @Override + public void onPaused(Activity activity) { + disableForegroundDispatchInternal(activity, true); + } + }; + + void disableForegroundDispatchInternal(Activity activity, boolean force) { try { sService.setForegroundDispatch(null, null, null); + if (!force && !activity.isResumed()) { + throw new IllegalStateException("You must disable foreground dispatching " + + "while your activity is still resumed"); + } } catch (RemoteException e) { attemptDeadServiceRecovery(e); } |