HarmonyOS 音频面板拉起来没有效果

api12，现在使用https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ohos-multimedia-avvolumepanel-V5中的音量面板demo，一片白屏。

HarmonyOS

shlp

2025-01-09 17:29:24

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回答 1

按赞同

按时间

put_get

这个需要按音量键调节音量时候会出现，请参考下面的代码控制音量：

import { AVVolumePanel } from '@kit.AudioKit';

@Entry
@Component
struct PanGestureExample {
  @State offsetX: number = 0
  @State offsetY: number = 0
  @State positionX: number = 0
  @State positionY: number = 0
  @State volume: number = 0
  private panOption: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.Left | PanDirection.Right })
  private volumePanOption: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.Up | PanDirection.Down})
  build() {
    Column() {
      Column().height(100)

      AVVolumePanel({
        volumeLevel: this.volume,
        volumeParameter: {
          position: {
            x: 100,
            y: 200
          }
        }
      }).gesture( PanGesture(this.volumePanOption)
        .onActionStart((event: GestureEvent) => {
          console.info('Pan start')
        })
        .onActionUpdate((event: GestureEvent) => {
          if (event) {
            //this.offsetX = this.positionX + event.offsetX
            this.offsetY = this.positionY + event.offsetY
            this.volume = this.offsetY
            console.log("音量是：", this.volume)
          }
        })
        .onActionEnd((event: GestureEvent) => {
          this.positionX = this.offsetX
          this.positionY = this.offsetY
          console.info('Pan end')
        })
      ).backgroundColor(Color.Green)
        .width("10%").height("10%")

      Button('修改PanGesture触发条件')
        .onClick(() => {
          // 将PanGesture手势事件触发条件改为双指以任意方向拖动
          this.panOption.setDirection(PanDirection.All)
          this.panOption.setFingers(2)
        })
    }
  }
}
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