screenshot_callback

监听系统截图

注意事项

• Android需要获取存储权限才能正常使用
• 需要真机才能验证截图

Flutter中使用注意

如果在flutter中重写 didChangeAppLifecycleState，其中在三星手机上，侧面截图功能会执行 resumed生命周期。

case AppLifecycleState.resumed: // 应用程序可见，前台
_screenshotCallback.startScreenshot();
break;
  case AppLifecycleState.paused: // 应用程序不可见，后台
_screenshotCallback.stopScreenshot();
break;

鸿蒙OS代码

截图监听

  /**
   * 截图监听
   *
   * @param listener listener
   */
  setListener(listener: OnScreenShotListener | null) {
this.mListener = listener
  }

  private onCallback: Callback<photoAccessHelper.ChangeData> = (changeData) => {
if (changeData && changeData.type == photoAccessHelper.NotifyType.NOTIFY_ADD && changeData.uris) {
  Log.i(TAG, `listen receive screenshot->${changeData.uris}`);
  for (let photo of changeData.uris) {
if (photo && photo.indexOf(SCREENSHOT_PREFIX) > 0) {
  this.mListener && this.mListener.onShot(photo)
  break
}
  }
}
  }

开启截图监听

  /**
   * 开启截图监听
   *
   * @param windowClass windowClass
   */
  async startListen(windowClass: window.Window | null): Promise<void> {
if (!windowClass) {
  Log.w(TAG, "startListen window empty")
  return
}
Log.i(TAG, "startListen")
abilityAccessCtrl.createAtManager()
  .requestPermissionsFromUser(this.uiAbility?.context, ['ohos.permission.READ_IMAGEVIDEO'], async (err: BusinessError, data: PermissionRequestResult) => {
if (err) {
  Log.e(TAG, `requestPermissionsFromUser fail, err->${JSON.stringify(err)}`);
  this.mListener && this.mListener.onScreenCapturedWithDeniedPermission()
} else {
  Log.i(TAG, `requestPermissionsFromUser succ->${data?.permissions?.toString()}}`);
  this.phAccessHelper?.registerChange(photoAccessHelper.DefaultChangeUri.DEFAULT_PHOTO_URI, true, this.onCallback);
}
  });
  }

停止截图监听

  /**
   * 停止截图监听
   */
  stopListen(): void {
Log.i(TAG, "startListen")
this.phAccessHelper?.unRegisterChange(photoAccessHelper.DefaultChangeUri.DEFAULT_PHOTO_URI, this.onCallback);
  }
}