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我正在創建一個應用程序，它將從DB獲取用戶名並打印ID，然後在按鈕上單擊它將顯示當前的GPS coordinates。我已經實現它，但不知道爲什麼它不工作。無法查看按鈕在android studio上的當前座標
這裏是我的Manifest文件
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
下面是我MainActivity.java
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
private static final String TAG = "MainActivity";
private TextView tv_lat;
private TextView tv_long;
private Button btn_loc;
private GoogleApiClient googleApiClient;
private Location location;
private LocationManager mLocationManager;
private LocationManager locationManager;
private LocationRequest locationRequest;
private LocationListener locationListener;
private long UPDATE_INTERVAL = 2 * 1000; /* 10 secs */
private long FASTEST_INTERVAL = 2000; /* 2 sec */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_lat = (TextView)findViewById(R.id.tv_lat);
tv_long = (TextView)findViewById(R.id.tv_long);
btn_loc = (Button)findViewById(R.id.btn_loc);
// show location button click event
btn_loc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
googleApiClient = new GoogleApiClient.Builder(MainActivity.this)
.addConnectionCallbacks(MainActivity.this)
.addOnConnectionFailedListener(MainActivity.this)
.addApi(LocationServices.API)
.build();
}
});
mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
checkLocation(); //check whether location service is enable or not in your phone
}
@Override
public void onConnected(Bundle bundle) {
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
startLocationUpdates();
location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if(location == null)
{
startLocationUpdates();
}
if (location != null)
{
}
else {
Toast.makeText(this, "Location not Detected", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onConnectionSuspended(int i) {
Log.i(TAG, "Connection Suspended");
googleApiClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.i(TAG, "Connection failed. Error: " + connectionResult.getErrorCode());
}
@Override
protected void onStart() {
super.onStart();
if (googleApiClient != null) {
googleApiClient.connect();
}
}
@Override
protected void onStop() {
super.onStop();
if (googleApiClient.isConnected()) {
googleApiClient.disconnect();
}
}
private void startLocationUpdates() {
// Create the location request
locationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY)
.setInterval(UPDATE_INTERVAL)
.setFastestInterval(FASTEST_INTERVAL);
// Request location updates
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient,
locationRequest, this);
Log.d("reque", "--->>>>");
}
@Override
public void onLocationChanged(Location location) {
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
String msg = "Updated Location: " +
Double.toString(lattitude) + " , " +
Double.toString(longitude);
tv_lat.setText("Latitude is " + lattitude);
tv_long.setText("Longitude is " + longitude);
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
// You can now create a LatLng Object for use with maps
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
}
private boolean checkLocation() {
if(!isLocationEnabled())
showAlert();
return isLocationEnabled();
}
private boolean isLocationEnabled() {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void showAlert() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("Enable Location")
.setMessage("Your Locations Settings is set to 'Off'.\nPlease Enable Location to " +
"use this app")
.setPositiveButton("Location Settings", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(myIntent);
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
}
});
dialog.create().show();
}
}
else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
}
}
當我運行我在我的設備上的應用程序，如下圖所示結果
當我點擊get location coordinates沒有任何反應。 logcat中也沒有顯示錯誤或警告。
我已經搬到外面所有的代碼從button click事件
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
googleApiClient.connect();
mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
，然後更新調試它，我得到了如下的結果。
我不知道爲什麼座標沒有顯示:(
任何幫助將高度讚賞
在其Android版本上運行它？棉花糖或牛軋糖？並且你提供了權限？ –
我建議你去通過一個教程和下載從那裏工作的源代碼。你會在那裏找到所有細節。得到這個答案，你會在那裏找到鏈接。 http://stackoverflow.com/questions/1513485/how-do-i-get-the-current-gps-location-programmatically-in-android/36110892#36110892 –
@HammadNasir我在棉花糖上運行它，是的，我設置權限 – faisal1208