我的目标是获取设备的GPS位置并跟踪其运动,但我似乎无法找到如何使其工作。
目前,我正在为API 21开发,我正在使用以下谷歌Play服务库,因为它是中国可穿戴设备使用的库:
com.google.android.gms:play-services-wearable:7.8.87
我使用的代码如下:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_on_route);
locationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(UPDATE_INTERVAL_MS)
.setFastestInterval(FASTEST_INTERVAL_MS);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addApi(Wearable.API) // used for data layer API
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
startTravelTime = System.currentTimeMillis();
if (!hasGps()) {
Log.d(TAG, "This hardware doesn't have GPS.");
}
}
private boolean hasGps() {
return getPackageManager().hasSystemFeature(PackageManager.FEATURE_LOCATION_GPS);
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
Log.i("Connected!!!", "WERE CONNECTED");
}
@Override
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
mGoogleApiClient.disconnect();
System.out.println("onstop");
}
@Override
protected void onResume() {
super.onResume();
if(!mGoogleApiClient.isConnected()) {
mGoogleApiClient.connect();
}
}
@Override
protected void onPause() {
super.onPause();
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, OnRouteActivity.this);
}
mGoogleApiClient.disconnect();
}
@Override
public void onConnected(Bundle bundle) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, locationRequest, this).setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
if (status.getStatus().isSuccess()) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Successfully requested location updates");
}
} else {
Log.e(TAG,
"Failed in requesting location updates, "
+ "status code: "
+ status.getStatusCode()
+ ", message: "
+ status.getStatusMessage());
}
}
});
}
@Override
public void onLocationChanged(Location location){
// Display the latitude and longitude in the UI
mTextView = (TextView) findViewById(R.id.location);
mTextView.setText("Latitude: " + String.valueOf( location.getLatitude()) + "\nLongitude: " + String.valueOf( location.getLongitude()));
Toast.makeText(getBaseContext(), "Latitude: " + String.valueOf( location.getLatitude()) + "\nLongitude: " + String.valueOf( location.getLongitude()), Toast.LENGTH_LONG).show();
}