我正在尝试通过我的Onclick功能中的短信发送包含经度，纬度和城市名称的字符串“s”。但是我无法访问此字符串，因为它位于方法的内部类中。这是我的代码：
package com.horizonsedge.getcurrentlocation;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.telephony.SmsManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
import static android.Manifest.permission.ACCESS_FINE_LOCATION;
import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.READ_CONTACTS;
import static android.Manifest.permission.READ_PHONE_STATE;
import static android.Manifest.permission.SEND_SMS;
import static android.R.id.message;
public class GetCurrentLocation extends Activity
implements OnClickListener {
private LocationManager locationMangaer = null;
private LocationListener locationListener = null;
private Button btnGetLocation = null;
private EditText editLocation = null;
private ProgressBar pb = null;
private static final String TAG = "Debug";
private Boolean flag = false;
public static final int RequestPermissionCode = 1;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_get_current_location);
//if you want to lock screen for always Portrait mode
setRequestedOrientation(ActivityInfo
.SCREEN_ORIENTATION_PORTRAIT);
pb = (ProgressBar) findViewById(R.id.progressBar1);
pb.setVisibility(View.INVISIBLE);
editLocation = (EditText) findViewById(R.id.editTextLocation);
btnGetLocation = (Button) findViewById(R.id.btnLocation);
btnGetLocation.setOnClickListener(this);
locationMangaer = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@Override
public void onClick(View v) {
flag = displayGpsStatus();
if (flag) {
Log.v(TAG, "onClick");
editLocation.setText("Please!! move your device to" +
" see the changes in coordinates." + "\nWait..");
pb.setVisibility(View.VISIBLE);
locationListener = new MyLocationListener();
if(checkPermission()){
Toast.makeText(GetCurrentLocation.this, "All Permissions Granted Successfully", Toast.LENGTH_LONG).show();
}
else {
requestPermission();
}
//ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
//ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.SEND_SMS}, 1);
//checkAndRequestPermissions();
/* if(checkLocationPermission()==false){
checkLocationPermission();
}
else {
locationMangaer.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
}*/
locationMangaer.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
String messageToSend = "Please Help my location is " + MyLocationListener.s ;
String number = "0435025187";
SmsManager.getDefault().sendTextMessage(number, null, messageToSend, null,null);
} else {
alertbox("Gps Status!!", "Your GPS is: OFF");
}
//sendSms("+61435025187","hello");
//String messageToSend = "this is a message";
//String number = "0435025187";
//SmsManager.getDefault().sendTextMessage(number, null, messageToSend, null,null);
}
private void requestPermission() {
ActivityCompat.requestPermissions(GetCurrentLocation.this, new String[]
{
ACCESS_FINE_LOCATION,
SEND_SMS
}, RequestPermissionCode);
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case RequestPermissionCode:
if (grantResults.length > 0) {
boolean LocationPermission = grantResults[0] == PackageManager.PERMISSION_GRANTED;
boolean SendSMSPermission = grantResults[1] == PackageManager.PERMISSION_GRANTED;
if (LocationPermission && SendSMSPermission) {
Toast.makeText(GetCurrentLocation.this, "Permission Granted", Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(GetCurrentLocation.this,"Permission Denied",Toast.LENGTH_LONG).show();
}
}
break;
}
}
public boolean checkPermission() {
int FirstPermissionResult = ContextCompat.checkSelfPermission(getApplicationContext(), ACCESS_FINE_LOCATION);
int SecondPermissionResult = ContextCompat.checkSelfPermission(getApplicationContext(), SEND_SMS);
return FirstPermissionResult == PackageManager.PERMISSION_GRANTED &&
SecondPermissionResult == PackageManager.PERMISSION_GRANTED;
}
/*private void sendSms(String phoneNumber, String message) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse( "sms:" + phoneNumber ) );
intent.putExtra( "sms_body", message );
startActivity(intent);
}
public boolean checkLocationPermission()
{
String permission = "android.permission.ACCESS_FINE_LOCATION";
int res = this.checkCallingOrSelfPermission(permission);
return (res == PackageManager.PERMISSION_GRANTED);
}
public boolean checkSMSPermission()
{
String permission = "android.permission.SEND_SMS";
int res = this.checkCallingOrSelfPermission(permission);
return (res == PackageManager.PERMISSION_GRANTED);
}
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}*/
/*----Method to Check GPS is enable or disable ----- */
private Boolean displayGpsStatus() {
ContentResolver contentResolver = getBaseContext()
.getContentResolver();
boolean gpsStatus = Settings.Secure
.isLocationProviderEnabled(contentResolver,
LocationManager.GPS_PROVIDER);
if (gpsStatus) {
return true;
} else {
return false;
}
}
/*----------Method to create an AlertBox ------------- */
protected void alertbox(String title, String mymessage) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your Device's GPS is Disable")
.setCancelable(false)
.setTitle("** Gps Status **")
.setPositiveButton("Gps On",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// finish the current activity
// AlertBoxAdvance.this.finish();
Intent myIntent = new Intent(
Settings.ACTION_SECURITY_SETTINGS);
startActivity(myIntent);
dialog.cancel();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// cancel the dialog box
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("GetCurrentLocation Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
AppIndex.AppIndexApi.start(client, getIndexApiAction());
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
AppIndex.AppIndexApi.end(client, getIndexApiAction());
client.disconnect();
}
/*----------Listener class to get coordinates ------------- */
public class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location loc) {
editLocation.setText("");
pb.setVisibility(View.INVISIBLE);
Toast.makeText(getBaseContext(), "Location changed : Lat: " +
loc.getLatitude() + " Lng: " + loc.getLongitude(),
Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
/*----------to get City-Name from coordinates ------------- */
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(),
Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(), loc
.getLongitude(), 1);
if (addresses.size() > 0)
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
} catch (IOException e) {
e.printStackTrace();
}
String s = longitude + "\n" + latitude +
"\n\nMy Currrent City is: " + cityName;
editLocation.setText(s);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider,
int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
}
我已经尝试通过MyLocationListener.s访问变量来解决这个问题但是我收到错误“无法解析符号'”
答案 0 :(得分：2)
在oncreate（全局变量）之前声明变量
String s;
然后分配值
s = longitude + "\n" + latitude +
"\n\nMy Currrent City is: " + cityName;
在此之前的任何位置使用变量，确保它不为空
if(!s.isEmpty()&&s!=null)
{
//your code
}
答案 1 :(得分：0)
在GetCurrentLocation中声明字符串，内部类可以访问外部类字段。