@@ -9,10 +9,10 @@ The **EventHub** module provides APIs to subscribe to, unsubscribe from, and tri
## Usage
Before using any APIs in the **EventHub**, you must obtain an **EventHub** instance through the member variable **context** of the **Ability** instance.
Before using any APIs in the **EventHub**, you must obtain an **EventHub** instance through the member variable **context** of the **Ability** instance.
```js
importAbilityfrom'@ohos.application.Ability'
importAbilityfrom'@ohos.application.Ability';
exportdefaultclassMainAbilityextendsAbility{
func1(){
console.log("func1 is called");
...
...
@@ -34,15 +34,15 @@ Subscribes to an event.
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| event | string | Yes| Event name.|
| callback | Function | Yes| Callback invoked when the event is triggered.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| event | string | Yes| Event name.|
| callback | Function | Yes| Callback invoked when the event is triggered.|
**Example**
```js
importAbilityfrom'@ohos.application.Ability'
importAbilityfrom'@ohos.application.Ability';
exportdefaultclassMainAbilityextendsAbility{
onForeground(){
...
...
@@ -72,15 +72,15 @@ Unsubscribes from an event. If **callback** is specified, this API unsubscribes
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| event | string | Yes| Event name.|
| callback | Function | No| Callback for the event. If **callback** is unspecified, all callbacks of the event are unsubscribed.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| event | string | Yes| Event name.|
| callback | Function | No| Callback for the event. If **callback** is unspecified, all callbacks of the event are unsubscribed.|
**Example**
```js
importAbilityfrom'@ohos.application.Ability'
importAbilityfrom'@ohos.application.Ability';
exportdefaultclassMainAbilityextendsAbility{
onForeground(){
...
...
@@ -110,15 +110,15 @@ Triggers an event.
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| event | string | Yes| Event name.|
| ...args | Object[] | Yes| Variable parameters, which are passed to the callback when the event is triggered.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| event | string | Yes| Event name.|
| ...args | Object[] | Yes| Variable parameters, which are passed to the callback when the event is triggered.|
Obtains the audio track information. This API uses a callback to return the result. It can be called only after the [dataLoad](#audioplayer_on) event is triggered.
Obtains the audio track information. This API uses an asynchronous callback to return the result. It can be called only after the [dataLoad](#audioplayer_on) event is triggered.
| type | string | Yes | Event type. The following events are supported:<br>- 'play': triggered when the [play()](#audioplayer_play) API is called and audio playback starts.<br>- 'pause': triggered when the [pause()](#audioplayer_pause) API is called and audio playback is paused.<br>- 'stop': triggered when the [stop()](#audioplayer_stop) API is called and audio playback stops.<br>- 'reset': triggered when the [reset()](#audioplayer_reset) API is called and audio playback is reset.<br>- 'dataLoad': triggered when the audio data is loaded, that is, when the **src** attribute is configured.<br>- 'finish': triggered when the audio playback is finished.<br>- 'volumeChange': triggered when the [setVolume()](#audioplayer_setvolume) API is called and the playback volume is changed.|
| type | string | Yes | Event type. The following events are supported:<br>- 'play': triggered when the [play()](#audioplayer_play) API is called and audio playback starts.<br>- 'pause': triggered when the [pause()](#audioplayer_pause) API is called and audio playback is paused.<br>- 'stop': triggered when the [stop()](#audioplayer_stop) API is called and audio playback stops.<br>- 'reset': triggered when the [reset()](#audioplayer_reset) API is called and audio playback is reset.<br>- 'dataLoad': triggered when the audio data is loaded, that is, when the **src** attribute is configured.<br>- 'finish': triggered when the audio playback is finished.<br>- 'volumeChange': triggered when the [setVolume()](#audioplayer_setvolume) API is called and the playback volume is changed.|
| callback | () => void | Yes | Callback invoked when the event is triggered. |
**Example**
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@@ -570,9 +570,7 @@ audioPlayer.on('finish', () => { // Set the 'finish' event callbac
audioPlayer.stop();// Stop the playback and trigger the 'stop' event callback.
});
audioPlayer.on('error',(error)=>{// Set the 'error' event callback.
console.info(`audio error called, errName is ${error.name}`);
console.info(`audio error called, errCode is ${error.code}`);
console.info(`audio error called, errMessage is ${error.message}`);
| type | string | Yes | Event type, which is **'timeUpdate'** in this case.<br>The **'timeUpdate'** event is triggered when the [seek()](#audioplayer_seek) API is called.|
| callback | Callback\<number> | Yes | Callback invoked when the event is triggered. The input parameter of the callback is the time when the seek operation is successful. |
| type | string | Yes | Event type, which is **'timeUpdate'** in this case.<br>The **'timeUpdate'** event is triggered when the audio playback starts after an audio playback timestamp update.|
| callback | Callback\<number> | Yes | Callback invoked when the event is triggered. The input parameter is the updated timestamp. |
**Example**
```js
audioPlayer.on('timeUpdate',(seekDoneTime)=>{// Set the 'timeUpdate' event callback.
if(seekDoneTime==null){
console.info('audio seek fail');
audioPlayer.on('timeUpdate',(newTime)=>{// Set the 'timeUpdate' event callback.
Sets **SurfaceId**. This API uses a callback to return the result.
Sets **SurfaceId**. This API uses an asynchronous callback to return the result.
*Note: **SetDisplaySurface** must be called between the URL setting and the calling of **prepare**. A surface must be set for video streams without audio. Otherwise, the calling of **prepare** fails.
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@@ -763,7 +759,7 @@ Sets **SurfaceId**. This API uses a promise to return the result.
Seeks to the specified playback position. The next key frame at the specified position is played. This API uses a callback to return the result.
Seeks to the specified playback position. The next key frame at the specified position is played. This API uses an asynchronous callback to return the result.
| type | string | Yes | Event type. The following events are supported:<br>- 'prepare': triggered when the [prepare](#audiorecorder_prepare) API is called and the audio recording parameters are set.<br>- 'start': triggered when the [start](#audiorecorder_start) API is called and audio recording starts.<br>- 'pause': triggered when the [pause](#audiorecorder_pause) API is called and audio recording is paused.<br>- 'resume': triggered when the [resume](#audiorecorder_resume) API is called and audio recording is resumed.<br>- 'stop': triggered when the [stop](#audiorecorder_stop) API is called and audio recording stops.<br>- 'release': triggered when the [release](#audiorecorder_release) API is called and the recording resource is released.<br>- 'reset': triggered when the [reset](#audiorecorder_reset) API is called and audio recording is reset.|
| type | string | Yes | Event type. The following events are supported:<br>- 'prepare': triggered when the [prepare](#audiorecorder_prepare) API is called and the audio recording parameters are set.<br>- 'start': triggered when the [start](#audiorecorder_start) API is called and audio recording starts.<br>- 'pause': triggered when the [pause](#audiorecorder_pause) API is called and audio recording is paused.<br>- 'resume': triggered when the [resume](#audiorecorder_resume) API is called and audio recording is resumed.<br>- 'stop': triggered when the [stop](#audiorecorder_stop) API is called and audio recording stops.<br>- 'release': triggered when the [release](#audiorecorder_release) API is called and the recording resource is released.<br>- 'reset': triggered when the [reset](#audiorecorder_reset) API is called and audio recording is reset.|
| callback | ()=>void | Yes | Callback invoked when the event is triggered. |
**Example**
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@@ -1825,9 +1819,7 @@ let audioRecorderConfig = {
location:{latitude:30,longitude:130},
}
audioRecorder.on('error',(error)=>{// Set the 'error' event callback.
console.info(`audio error called, errName is ${error.name}`);
console.info(`audio error called, errCode is ${error.code}`);
console.info(`audio error called, errMessage is ${error.message}`);
Starts video recording in asynchronous mode. This API uses a callback to return the result.
Starts video recording. This API uses an asynchronous callback to return the result.
This API can be called only after [prepare()](#videorecorder_prepare1) and [getInputSurface()](#getinputsurface9) are called, because the data source must pass data to the surface first.
Starts video recording in asynchronous mode. This API uses a promise to return the result.
Starts video recording. This API uses a promise to return the result.
This API can be called only after [prepare()](#videorecorder_prepare1) and [getInputSurface()](#getinputsurface9) are called, because the data source must pass data to the surface first.
