android - ActivityRecognitionIntentService onHandleIntent 仅偶尔触发

Question

我正在尝试为我的应用获取 Activity 识别更新，但它似乎只能部分工作。一开始我以为它不工作但每隔一段时间调试日志就会显示一个 Activity 类型，这意味着 ActivityRecognitionIntentService onHandleIntent() 被击中但它从未进入 ActivityBroadCastReceiver

我在MainActivity中有如下代码

    Intent i = new Intent(this, ActivityRecognitionIntentService.class);
    i.setAction("ActivityRecognitionIntentService");
    PendingIntent activityRecognitionPendingIntent = PendingIntent.getService(this, 7422, i, PendingIntent.FLAG_UPDATE_CURRENT);
    ActivityRecognitionApi rec = ActivityRecognition.ActivityRecognitionApi;
    rec.requestActivityUpdates(mClient, 5000, activityRecognitionPendingIntent)
            .setResultCallback(new ResultCallback<Status>() {
                @Override
                public void onResult(Status status) {
                    if (status.isSuccess()) {
                        Log.i(TAG, "Successfully registered updates");
                    } else {
                        Log.i(TAG, "Failed to register updates");
                    }
                }
            });;

如果我做对了，那应该每 5 秒触发一次。关联的 IntentService 是:

public class ActivityRecognitionIntentService extends IntentService {

ActivityRecognitionResult result;
Intent i;
DetectedActivity mpactivity;

public ActivityRecognitionIntentService() {
    super("ActivityRecognitionIntentService");
    i = new Intent("ACTIVITY_RECOGNITION_DATA");
    Log.d(MainActivity.TAG, "ActivityRecognitionIntentService created");
}

private String getTypes(int type) {
    Log.d(MainActivity.TAG, "type = " + type);
    if(type == DetectedActivity.UNKNOWN)
        return "Unknown";
    else if(type == DetectedActivity.IN_VEHICLE)
        return "In Vehicle";
    else if(type == DetectedActivity.ON_BICYCLE)
        return "On Bicycle";
    else if(type == DetectedActivity.RUNNING)
        return "Running";
    else if(type == DetectedActivity.ON_FOOT)
        return "On Foot";
    else if(type == DetectedActivity.STILL)
        return "Still";
    else if(type == DetectedActivity.TILTING)
        return "Tilting";
    else if(type == DetectedActivity.WALKING)
        return "Walking";
    else
        return "";
}

@Override
protected void onHandleIntent(Intent intent) {
    Log.d(MainActivity.TAG, "onHandleIntent");
    if (intent.getAction() == "ActivityRecognitionIntentService") {
        if(ActivityRecognitionResult.hasResult(intent)){
            result = ActivityRecognitionResult.extractResult(intent);
            mpactivity = result.getMostProbableActivity();
            i.putExtra("Activity", getTypes(mpactivity.getType()));
            i.putExtra("Confidence", mpactivity.getConfidence());
            LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(i);
        }
    }
}

我的 list 显示:

    <service android:name=".ActivityRecognitionIntentService" android:exported="false"></service>

    <receiver android:name=".ActivityBroadcastReceiver" android:exported="false">
        <intent-filter>
            <action android:name="ACTIVITY_RECOGNITION_DATA"/>
        </intent-filter>
    </receiver>
    <meta-data android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

使用广播接收器:

public class ActivityBroadcastReceiver extends android.content.BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    Log.d(MainActivity.TAG, "BroadcastReceiver");
    Toast.makeText(context, "Service received", Toast.LENGTH_SHORT).show();
}

为什么它只是偶尔有效？调试时不允许手机休眠(N6)。此外，为什么它没有到达 BroadcastReceiver？

Answer 1

detectionIntervalMillis 将不准确。如果电话静止不动，则在 Activity 发生变化之前它可能不会报告任何内容。根据我的经验，当当前 Activity 没有变化时，间隔时间会更长。

引用文档，为了节省电池电量，当设备长时间“静止”时， Activity 报告可能会停止。一旦设备再次移动，它将恢复。 您的设备静止不动吗？尝试摇晃或四处走动以进行测试。