Lines Matching refs:observer

6 The state registry module provides APIs to register and deregister an observer that listens for var…
34 -   The API for registering an observer for the SIM card status takes effect only when SIM cards ar…
46 …ng, options: { slotId?: number }, callback: AsyncCallback\<T\>): void; | Registers an observer.   |
47 | function off(type: String, callback?: AsyncCallback\<T\>): void; | Deregisters an observer. |
70 The function of registering an observer for call status change events is used as an example. The pr…
72 1.  Call the  **on**  method with the  **type**  parameter specified to register an observer for di…
74 3.  Call the  **off**  method to deregister the observer. After the observer is deregistered, no ca…
77     // Import the observer package.
78     import observer from '@ohos.telephony.observer';
80     // Registers an observer.
81     observer.on('callStateChange', {slotId: 1}, (err, value) => {
91     // Deregister the observer.
92     observer.off('callStateChange', (err, value) => {