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未验证 提交 ad4499f6 编写于 作者: O openharmony_ci 提交者： Gitee
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en/application-dev/reference/apis/js-apis-system-timer.md
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# System Timer
# @ohos.systemTimer
The **systemTimer** module provides system timer features. You can use the APIs of this module to implement the alarm clock and other timer services.
......@@ -33,13 +33,13 @@ Defines the initialization options for **createTimer**.
**System capability**: SystemCapability.MiscServices.Time
| Name | Type | Mandatory| Description |
| --------- | --------------------------------- | ---- | ------------------------------------------------------------ |
| type | number | Yes | Timer type.<br>**1**: CPU time type. The start time of the timer cannot be later than the current system time.<br>**2**: wakeup type.<br>**4**: exact type.<br>**5**: idle type (not supported currently).|
| repeat | boolean | Yes | Whether the timer is a repeating timer. The value **true** means that the timer is a repeating timer, and **false** means that the timer is a one-shot timer. |
| interval | number | No | Repeat interval. For a repeating timer, the value must be greater than 5000 ms. For a one-shot timer, the value is **0**.|
| wantAgent | [WantAgent](js-apis-wantAgent.md) | No | **WantAgent** object of the notification to be sent when the timer expires. (An application MainAbility can be started, but not a Service ability.)|
| callback | number | Yes | Callback used to return the timer ID. |
| Name | Type | Mandatory| Description |
| --------- | --------------------------------------------- | ---- | ------------------------------------------------------------ |
| type | number | Yes | Timer type.<br>**1**: CPU time type. (The start time of the timer cannot be later than the current system time.)<br>**2**: wakeup type.<br>**4**: exact type.<br>**8**: idle type (not supported currently).|
| repeat | boolean | Yes | Whether the timer is a repeating timer. The value **true** means that the timer is a repeating timer, and **false** means that the timer is a one-shot timer. |
| interval | number | No | Repeat interval. For a repeating timer, the value must be greater than 5000 ms. For a one-shot timer, the value is **0**.|
| wantAgent | [WantAgent](js-apis-app-ability-wantAgent.md) | No | **WantAgent** object of the notification to be sent when the timer expires. (An application MainAbility can be started, but not a Service ability.)|
| callback | number | Yes | Callback used to return the timer ID. |
## systemTimer.createTimer
......@@ -48,6 +48,8 @@ createTimer(options: TimerOptions, callback: AsyncCallback&lt;number&gt;): void
Creates a timer. This API uses an asynchronous callback to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -66,13 +68,17 @@ export default {
type: systemTimer.TIMER_TYPE_REALTIME,
repeat: false
};
systemTimer.createTimer(options, (error, data) => {
if (error) {
console.error(`Failed to create timer. Cause:` + JSON.stringify(error));
return;
}
console.log(`Succeeded in creating timer. Data:` + JSON.stringify(data));
});
try {
systemTimer.createTimer(options, (error) => {
if (error) {
console.info(`Failed to create timer. message:${error.message}, code:${error.code}`);
return;
}
console.info(`Succeeded in creating timer.`);
});
} catch(e) {
console.info(`Failed to create timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -83,6 +89,8 @@ createTimer(options: TimerOptions): Promise&lt;number&gt;
Creates a timer. This API uses a promise to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -105,12 +113,16 @@ export default {
let options = {
type: systemTimer.TIMER_TYPE_REALTIME,
repeat:false
};
systemTimer.createTimer(options).then((data) => {
console.log(`Succeeded in creating timer. Data:` + JSON.stringify(data));
}).catch((error) => {
console.error(`Failed to create timer. Cause:` + JSON.stringify(error));
});
};
try {
systemTimer.createTimer(options).then(() => {
console.info(`Succeeded in creating timer.`);
}).catch((error) => {
console.info(`Failed to create timer. message:${error.message}, code:${error.code}`);
});
} catch(e) {
console.info(`Failed to create timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -121,6 +133,8 @@ startTimer(timer: number, triggerTime: number, callback: AsyncCallback&lt;void&g
Starts a timer. This API uses an asynchronous callback to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -143,12 +157,17 @@ export default {
let timerId = await systemTimer.createTimer(options)
let triggerTime = new Date().getTime()
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime, (error) => {
if (error) {
console.error(`Failed to start timer. Cause:` + JSON.stringify(error));
return;
}
});
try {
systemTimer.startTimer(timerId, triggerTime, (error) => {
if (error) {
console.info(`Failed to start timer. message:${error.message}, code:${error.code}`);
return;
}
console.info(`Succeeded in starting timer.`);
});
} catch(e) {
console.info(`Failed to start timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -159,6 +178,8 @@ startTimer(timer: number, triggerTime: number): Promise&lt;void&gt;
Starts a timer. This API uses a promise to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -186,11 +207,15 @@ export default {
let timerId = await systemTimer.createTimer(options)
let triggerTime = new Date().getTime()
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime).then((data) => {
console.log(`Succeeded in startting timer. Data:` + JSON.stringify(data));
}).catch((error) => {
console.error(`Failed to start timer. Cause:` + JSON.stringify(error));
});
try {
systemTimer.startTimer(timerId, triggerTime).then(() => {
console.info(`Succeeded in starting timer.`);
}).catch((error) => {
console.info(`Failed to start timer. message:${error.message}, code:${error.code}`);
});
} catch(e) {
console.info(`Failed to start timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -201,6 +226,8 @@ stopTimer(timer: number, callback: AsyncCallback&lt;void&gt;): void
Stops a timer. This API uses an asynchronous callback to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -214,22 +241,27 @@ Stops a timer. This API uses an asynchronous callback to return the result.
```js
export default {
async systemTimer () {
let options = {
type: systemTimer.TIMER_TYPE_REALTIME,
repeat:false
}
let timerId = await systemTimer.createTimer(options)
let triggerTime = new Date().getTime()
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime)
systemTimer.stopTimer(timerId, (error) => {
if (error) {
console.error(`Failed to stop timer. Cause:` + JSON.stringify(error));
return;
}
});
}
async systemTimer () {
let options = {
type: systemTimer.TIMER_TYPE_REALTIME,
repeat:false
}
let timerId = await systemTimer.createTimer(options)
let triggerTime = new Date().getTime()
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime)
try {
systemTimer.stopTimer(timerId, (error) => {
if (error) {
console.info(`Failed to stop timer. message:${error.message}, code:${error.code}`);
return;
}
console.info(`Succeeded in stopping timer.`);
});
} catch(e) {
console.info(`Failed to stop timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -239,6 +271,8 @@ stopTimer(timer: number): Promise&lt;void&gt;
Stops a timer. This API uses a promise to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -257,21 +291,25 @@ Stops a timer. This API uses a promise to return the result.
```js
export default {
async systemTimer (){
let options = {
type: systemTimer.TIMER_TYPE_REALTIME,
repeat:false
}
let timerId = await systemTimer.createTimer(options)
let triggerTime = new Date().getTime()
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime)
systemTimer.stopTimer(timerId).then((data) => {
console.log(`Succeeded in stopping timer. Data:` + JSON.stringify(data));
}).catch((error) => {
console.error(`Failed to stop timer. Cause:` + JSON.stringify(error));
});
}
async systemTimer (){
let options = {
type: systemTimer.TIMER_TYPE_REALTIME,
repeat:false
}
let timerId = await systemTimer.createTimer(options)
let triggerTime = new Date().getTime()
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime)
try {
systemTimer.stopTimer(timerId).then(() => {
console.info(`Succeeded in stopping timer.`);
}).catch((error) => {
console.info(`Failed to stop timer. message:${error.message}, code:${error.code}`);
});
} catch(e) {
console.info(`Failed to stop timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -281,6 +319,8 @@ destroyTimer(timer: number, callback: AsyncCallback&lt;void&gt;): void
Destroys a timer. This API uses an asynchronous callback to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -304,12 +344,17 @@ export default {
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime)
systemTimer.stopTimer(timerId)
systemTimer.destroyTimer(timerId, (error) => {
if (error) {
console.error(`Failed to destroy timer. Cause:` + JSON.stringify(error));
return;
}
});
try {
systemTimer.destroyTimer(timerId, (error) => {
if (error) {
console.info(`Failed to destroy timer. message:${error.message}, code:${error.code}`);
return;
}
console.info(`Succeeded in destroying timer.`);
});
} catch(e) {
console.info(`Failed to destroying timer. message:${e.message}, code:${e.code}`);
}
}
}
```
......@@ -320,6 +365,8 @@ destroyTimer(timer: number): Promise&lt;void&gt;
Destroys a timer. This API uses a promise to return the result.
**System API**: This is a system API.
**System capability**: SystemCapability.MiscServices.Time
**Parameters**
......@@ -348,11 +395,15 @@ export default {
triggerTime += 3000
systemTimer.startTimer(timerId, triggerTime)
systemTimer.stopTimer(timerId)
systemTimer.destroyTimer(timerId).then((data) => {
console.log(`Succeeded in destroying timer. Data:` + JSON.stringify(data));
}).catch((error) => {
console.error(`Failed to destroy timer. Cause:` + JSON.stringify(error));
});
try {
systemTimer.destroyTimer(timerId).then(() => {
console.info(`Succeeded in destroying timer.`);
}).catch((error) => {
console.info(`Failed to destroy timer. message:${error.message}, code:${error.code}`);
});
} catch(e) {
console.info(`Failed to destroying timer. message:${e.message}, code:${e.code}`);
}
}
}
```
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