Android 活动识别技术详解 - 基于kesenhoo/android-training-course-in-chinese项目-优快云博客

本文链接：https://blog.youkuaiyun.com/gitblog_00213/article/details/148416634

Android 活动识别技术详解 - 基于kesenhoo/android-training-course-in-chinese项目

android-training-course-in-chinese Android官方培训课程中文版项目地址: https://gitcode.com/gh_mirrors/an/android-training-course-in-chinese

概述

活动识别(Activity Recognition)是Android位置服务中的重要功能，它能够检测用户当前的身体活动状态，如步行、跑步、驾驶、骑行或静止等。这项技术通过分析设备传感器数据，智能判断用户活动类型，为应用提供丰富的上下文信息。本文将深入解析Android活动识别技术的实现原理和最佳实践。

核心实现步骤

1. 权限配置

在AndroidManifest.xml中添加活动识别权限：

<uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION"/>

注意：与常规位置权限不同，活动识别不需要ACCESS_COARSE_LOCATION或ACCESS_FINE_LOCATION权限。

2. 服务可用性检查

在使用活动识别功能前，必须确保设备已安装Google Play服务：

private boolean servicesConnected() {
    int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
    return ConnectionResult.SUCCESS == resultCode;
}

3. 请求活动识别更新

3.1 初始化客户端

mActivityRecognitionClient = new ActivityRecognitionClient(context, this, this);

3.2 创建PendingIntent

Intent intent = new Intent(context, ActivityRecognitionIntentService.class);
mActivityRecognitionPendingIntent = PendingIntent.getService(
    context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

3.3 设置请求参数

// 设置检测间隔为20秒
public static final int DETECTION_INTERVAL_MILLISECONDS = 20 * 1000;

3.4 发起请求

public void startUpdates() {
    if (!mInProgress && servicesConnected()) {
        mInProgress = true;
        mActivityRecognitionClient.connect();
    }
}

4. 处理连接回调

@Override
public void onConnected(Bundle dataBundle) {
    mActivityRecognitionClient.requestActivityUpdates(
        DETECTION_INTERVAL_MILLISECONDS,
        mActivityRecognitionPendingIntent);
    mInProgress = false;
    mActivityRecognitionClient.disconnect();
}

5. 实现IntentService处理结果

public class ActivityRecognitionIntentService extends IntentService {
    @Override
    protected void onHandleIntent(Intent intent) {
        if (ActivityRecognitionResult.hasResult(intent)) {
            ActivityRecognitionResult result = 
                ActivityRecognitionResult.extractResult(intent);
            DetectedActivity mostProbableActivity = 
                result.getMostProbableActivity();
            
            int confidence = mostProbableActivity.getConfidence();
            int activityType = mostProbableActivity.getType();
            String activityName = getNameFromType(activityType);
            
            // 处理识别结果
        }
    }
    
    private String getNameFromType(int activityType) {
        switch(activityType) {
            case DetectedActivity.IN_VEHICLE:
                return "驾驶中";
            case DetectedActivity.ON_BICYCLE:
                return "骑行中";
            case DetectedActivity.ON_FOOT:
                return "步行中";
            case DetectedActivity.RUNNING:
                return "跑步中";
            case DetectedActivity.STILL:
                return "静止中";
            case DetectedActivity.TILTING:
                return "设备倾斜";
            case DetectedActivity.UNKNOWN:
                return "未知状态";
            case DetectedActivity.WALKING:
                return "行走中";
            default:
                return "未识别";
        }
    }
}