使用Google Play服務進行活動識別和位置更新

Question

我正在嘗試根據用戶的活動來接收位置，即，如果用戶仍然在位，則位置更新的頻率會降低，並且他走路或開車時更新會更快。 我已經編寫了一個服務來接收位置更新，並將廣播接收器放在onCreate()方法中，該方法接收從主要活動廣播的意圖。 這些廣播的意圖帶有字符串，該字符串告訴我的廣播接收者用戶的“活動”。 但是此接收者從未收到意圖，因此我無法設置locationRequest計時，基於該計時我將適當的locationRequest傳遞給服務。

任何機構都可以告訴並幫助為什么服務的onCreate中的廣播接收器可能沒有被調用。 謝謝。

public class MyActivityRecognition extends Activity implements
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener {

    private ActivityRecognitionClient arclient;
    private PendingIntent pIntent;
    private BroadcastReceiver receiver;
    private TextView tvActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvActivity = (TextView) findViewById(R.id.tvActivity);

        int resp = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if (resp == ConnectionResult.SUCCESS) {
            arclient = new ActivityRecognitionClient(this, this, this);
            arclient.connect();

        } else {
            Toast.makeText(this, "Please install Google Play Service.",
                    Toast.LENGTH_SHORT).show();
        }

        receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String u = intent.getStringExtra("Activity");
                String v = "Activity :" + intent.getStringExtra("Activity")
                        + " " + "Confidence : "
                        + intent.getExtras().getInt("Confidence") + "\n";
                tvActivity.setText(v);


                Intent activityIntent = new Intent();
                intent.setAction("com.example.useractivity");
                intent.putExtra("ACTIVITY", u);
                sendBroadcast(activityIntent);
            }
        };

服務類如下：

public class LocationService extends Service implements
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener, LocationListener {

    private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;

    private static final int MILLISECONDS_PER_SECOND = 1000;

    private static final int FASTEST_INTERVAL_IN_SECONDS = 5;

    private static final long FASTEST_INTERVAL = MILLISECONDS_PER_SECOND
            * FASTEST_INTERVAL_IN_SECONDS;


    LocationRequest mLocationRequest;
    LocationClient mLocationClient;
    boolean mUpdatesRequested;
    String mActivity="Still";
    private BroadcastReceiver myReceiver;

    @Override
    public void onCreate() {
        super.onCreate();

        myReceiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {

                String action = intent.getAction();
                if(action.equals("com.example.useractivity")){
                    mActivity = intent.getExtras().getString("ACTIVITY");

                }

            }
        };

        IntentFilter filter = new IntentFilter();
        filter.addAction("com.example.useractivity");
        registerReceiver(myReceiver, filter);

        mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        if (mActivity.equalsIgnoreCase("Still")
                || mActivity.equalsIgnoreCase("Tilting")
                || mActivity.equalsIgnoreCase("Unknown")) {
            mLocationRequest.setInterval(30*1000);

        } else if (mActivity.equalsIgnoreCase("On Foot")
                || mActivity.equalsIgnoreCase("On Bicycle")) {
            mLocationRequest.setInterval(20*1000);

        } else if (mActivity.equalsIgnoreCase("In Vehicle")) {
            mLocationRequest.setInterval(10*1000);

        }
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);

        mLocationClient = new LocationClient(getApplicationContext(), this, this);
        mUpdatesRequested = true;

        mLocationClient.connect();
    }

    @Override
    public void onLocationChanged(Location location) {

        String latitude = Double.toString(location.getLatitude());
        String longitude = Double.toString(location.getLongitude());

        String msg = "Updated Location: " + latitude + "," + longitude;
        Toast.makeText(getApplicationContext(), msg,
                Toast.LENGTH_SHORT).show();
        System.out.println(Double.toString(location.getLatitude()) + ","
                        + Double.toString(location.getLongitude()));

        SaveData sd = new SaveData(getApplicationContext());
        sd.save(mActivity, latitude, longitude);
    }

    @Override
    public void onConnected(Bundle arg0) {
        if (mUpdatesRequested) {

            mLocationClient.requestLocationUpdates(mLocationRequest, this);

        }
    }

Answer 1

我知道這個問題我來晚了，但是我還是想回答。

在MyActivityRecognition中，您似乎正在使用傳遞給onReceive的'intent'變量，我認為您想在其中設置動作以及對activityIntent進行額外設置。 見下文。

Intent activityIntent = new Intent();
intent.setAction("com.example.useractivity");
intent.putExtra("ACTIVITY", u);
sendBroadcast(activityIntent);

也許你的意思是這樣的：

Intent activityIntent = new Intent();
activityIntent.setAction("com.example.useractivity");
activityIntent.putExtra("ACTIVITY", u);
sendBroadcast(activityIntent);

通過不使用activityIntent，您的服務將不會收到額外的費用和操作，因此不會執行您想要的操作。

我希望這會有所幫助，謝謝:)（這是我的第一個回答嘗試，如果正確，請標記為正確。）