如何在Toast消息中连续显示纬度和经度？

时间：2014-03-09 16:14:21

标签： android gps

我想在烤面包中连续显示纬度和经度... 如果用户移动那么lat应该更改...以下代码只在安装时弹出lat long它没有改变... 我希望lat长而没有互联网意味着只有GPS ......

GPSTracker.java 

package com.techblogon.serviceexample;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }       
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

MyService.java 

package com.techblogon.serviceexample;

import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service{
    GPSTracker gps;
    static int i=0;
    private static final String TAG = "MyService";



    @Override
    public IBinder onBind(Intent arg0) {

    return null;
}

@Override
public void onCreate() {

    Toast.makeText(this, "Congrats! MyService Created", Toast.LENGTH_SHORT).show();
    Log.d(TAG, "onCreate");

    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(MyService.this);
    Editor editor = sharedPreferences.edit();

    editor.putInt("key", 0);
    editor.commit();
}

@Override
public void onStart(Intent intent, int startId) {
    //Toast.makeText(this, "My Service Started", Toast.LENGTH_SHORT).show();
    gps = new GPSTracker(MyService.this);
    i=0;

    Handler h = new Handler();
    h.postDelayed(new Runnable()
    {
         public void run() 
         {
             if(getI()==0)
             {
              latlong();
              startService(new Intent(MyService.this,MyService.class));
             }
         }
     }, 5000);


    Log.d(TAG, "onStart");  
}

@Override
public void onDestroy() {
    i=1;
    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(MyService.this);
    Editor editor = sharedPreferences.edit();

    editor.putInt("key", 1);
    editor.commit();
    Toast.makeText(this, "MyService Stopped", Toast.LENGTH_SHORT).show();
    Log.d(TAG, "onDestroy");
}

public int getI()
{
    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    return sharedPreferences.getInt("key",0);
}

public void latlong()
{
    if(gps.canGetLocation()){

        double latitude = gps.getLatitude();
        double longitude = gps.getLongitude();

        Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_SHORT).show();

    }else{
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        gps.showSettingsAlert();
    }
}

}

MainActivity.java 

package com.techblogon.serviceexample;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    //start the service
    public void onClickStartServie(View V)
    {
        //start the service from here //MyService is your service class name
        startService(new Intent(this, MyService.class));
    }
    //Stop the started service
    public void onClickStopService(View V)
    {
        //Stop the running service from here//MyService is your service class name
        //Service will only stop if it is already running.
        stopService(new Intent(this, MyService.class));
    }



}

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/text_view_header"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:textColor="#FF0000"
        android:textSize="20sp"
        android:text=" " />
        <Button
        android:id="@+id/start_service"
        android:layout_marginTop="20dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:text="Start Service"
        android:layout_below="@+id/text_view_header"
        android:onClick="onClickStartServie" />
    <Button
        android:id="@+id/stop_service"
        android:layout_marginTop="20dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:text="Stop Service"
        android:layout_below="@+id/start_service"
        android:onClick="onClickStopService" />

</RelativeLayout>

的AndroidManifest.xml 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.techblogon.serviceexample"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.techblogon.serviceexample.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:enabled="true" android:name=".MyService" />

    </application>
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  
        <uses-permission android:name="android.permission.INTERNET" />
</manifest>

请给我代码，我需要改变...... ????

1 个答案:

答案 0 :(得分：1)

使用您所在位置的LocationManager 设置刷新率：

LocationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

然后，在onLocationChanged(Location l)方法中，发布Toast消息：

    @Override
    public void onLocationChanged(Location location) {

        Toast.makeText(getApplicationContext(), "Long: " + location.getLongitude() + ", Lat: " + location.getLatitude(), Toast.LENGTH_SHORT).show();
    }

每当用户的位置发生变化时，系统会发出Toast条消息。

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