问题
I am a beginner in the Android Development.I want to make an android app which sends the GPS and network locations (lat & long) to my server (static IP). I have found the following code and it worked successfully, data receive at the app which is already made at server side (Right now it has nothing to do with client app)
Data received at my Server when I click the button 'Send Location' on my Android App.
GET /31.4244456/74.7349772 HTTP/1.1
Host: 180.178.169.77:6081
Connection: keep-Alive
User-Agent: Apache-HttpClient/Unavailable (java 1.4)
180.178.169.77 is my server IP and 6081 is the port
At this point everything is going fine and I acheived almost what I wanted but the real problem I'm facing is that my Android app hangs and crash after sending this data to server. Please resolve my problem if anybody has an idea.
I have found the Code from here. http://www.gideondsouza.com/blog/how-to-get-the-current-location-address-and-send-it-to-a-server-on-android#.UNLbTOT0Dxo
Here is my AddressActivity.java
package com.gideon.address;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class AddressActivity extends Activity {
/** Called when the activity is first created. */
String lat="", lon="";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnLocation = (Button)findViewById(R.id.btnLocation);
btnLocation.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) AddressActivity.this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
lat = Double.toString(location.getLatitude());
lon = Double.toString(location.getLongitude());
TextView tv = (TextView) findViewById(R.id.txtLoc);
tv.setText("Your Location is:" + lat + "--" + lon);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
});
Button btnSend = (Button)findViewById(R.id.btnSend);
btnSend.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
postData(lat, lon);
}
});
Button btnAdd = (Button)findViewById(R.id.btnAddress);
btnAdd.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
TextView tv = (TextView)findViewById(R.id.txtAddress);
tv.setText(GetAddress(lat, lon));
}
});
}
public void postData(String la, String lo) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
//HttpGet htget = new HttpGet("http://myappurl.com/Home/Book/"+la+"/"+lo);
HttpGet htget = new HttpGet("http://180.178.169.77:6081/"+la+"/"+lo);
try {
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(htget);
String resp = response.getStatusLine().toString();
Toast.makeText(this, resp, 5000).show();
} catch (ClientProtocolException e) {
Toast.makeText(this, "Error", 5000).show();
} catch (IOException e) {
Toast.makeText(this, "Error", 5000).show();
}
}
public String GetAddress(String lat, String lon)
{
Geocoder geocoder = new Geocoder(this, Locale.ENGLISH);
String ret = "";
try {
List<Address> addresses = geocoder.getFromLocation(Double.parseDouble(lat), Double.parseDouble(lon), 1);
if(addresses != null) {
Address returnedAddress = addresses.get(0);
StringBuilder strReturnedAddress = new StringBuilder("Address:\n");
for(int i=0; i<returnedAddress.getMaxAddressLineIndex(); i++) {
strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
}
ret = strReturnedAddress.toString();
}
else{
ret = "No Address returned!";
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
ret = "Can't get Address!";
}
return ret;
}
}
And here is my AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gideon.address"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".AddressActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
回答1:
Move postData off the main thread to a secondary thread. Look at Async task for examples here: http://developer.android.com/reference/android/os/AsyncTask.html
回答2:
Your problem is that
public void onClick(View v) {
postData(lat, lon);
}
runs on the UI thread. It means that while you do the "post" action, the UI isn't refreshed and cannot be accessed - your app get stuck until the post ends.
You need to do something like:
public void onClick(View v) {
PostAsyncTask postAsyncTask = new PostAsyncTask();
postAsyncTask.execute();
}
private class PostAsyncTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
postData(lat, lon);
return 0;
}
protected void onPreExecute() {
// show progress dialog
}
protected void onPostExecute(Long result) {
// hide progress dialog
}
}
回答3:
The solution for the Problem is :
Added a new thread
new Thread(new Runnable() {
public void run() {
// your code goes here
postData(lat, lon);
}
}).start();
}
and the code is like :
Button btnSend = (Button)findViewById(R.id.btnSend);
btnSend.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new Thread(new Runnable() {
public void run() {
// your code goes here
postData(lat, lon);
}
}).start();
}
});
And my complete code for AddressActivity.java is like :
package com.gideon.address;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.content.Context;
//import android.location.Address;
//import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class AddressActivity extends Activity {
/** Called when the activity is first created. */
String lat="", lon="";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnLocation = (Button)findViewById(R.id.btnLocation);
btnLocation.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) AddressActivity.this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
lat = Double.toString(location.getLatitude());
lon = Double.toString(location.getLongitude());
TextView tv = (TextView) findViewById(R.id.txtLoc);
tv.setText("Your Location is:" + lat + "--" + lon);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
});
Button btnSend = (Button)findViewById(R.id.btnSend);
btnSend.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new Thread(new Runnable() {
public void run() {
// your code goes here
postData(lat, lon);
}
}).start();
}
});
// Button btnAdd = (Button)findViewById(R.id.btnAddress);
//btnAdd.setOnClickListener(new OnClickListener() {
//public void onClick(View v) {
//TextView tv = (TextView)findViewById(R.id.txtAddress);
//tv.setText(GetAddress(lat, lon));
//}
//});
}
public void postData(String la, String lo) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://180.178.169.77:6081/"+la+"/"+lo);
try {
// Execute HTTP Post Request
//HttpResponse response = httpclient.execute(htget);
HttpResponse response = httpclient.execute(httppost);
//String resp = response.getStatusLine().toStrinkatyg(); try this now
//Toast.makeText(this, resp, 5000).show();
} catch (ClientProtocolException e) {
//Toast.makeText(this, "Error", 5000).show();
}
catch (IOException e) {
//Toast.makeText(this, "Error", 5000).show();
}
}
//public String GetAddress(String lat, String lon)
//{
//Geocoder geocoder = new Geocoder(this, Locale.ENGLISH);
// String ret = "";
//try {
//List<Address> addresses = geocoder.getFromLocation(Double.parseDouble(lat), Double.parseDouble(lon), 1);
//if(addresses != null) {
//Address returnedAddress = addresses.get(0);
//StringBuilder strReturnedAddress = new StringBuilder("Address:\n");
//for(int i=0; i<returnedAddress.getMaxAddressLineIndex(); i++) {
//strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
//}
//ret = strReturnedAddress.toString();
//}
//else{
//ret = "No Address returned!";
//}
//} catch (IOException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
//ret = "Can't get Address!";
//}
//return ret;
//}
}
I don,t need address ,geolocations feature so i commented everything related to it. That was my First working on a Android app so if i m wrong somewhere please guide me and tell me how can i Improve it.
Also please help me if:
1)I want to remove the send location button so that my location automatically goes to my server periodically on the defined time interval say 10 mins.
And the 2nd thing:
2)I want my app to choose the best provider ,GPS or GSM NETWORK , if one is not available send the location using the other.
来源：https://stackoverflow.com/questions/14088095/how-can-i-send-the-gps-and-network-location-cordinates-to-a-server-static-ip