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Thursday, 11 April 2013

Get details of Address returned from Geocoder

02:34


Modify MainActivity.java from last exercise "Search address by name with Geocoder, with Search Dialog", implement OnItemClickListener on the search result ListView.
package com.example.androidsearchgeocoder;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.SearchManager;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {

ListView listResult;

private ArrayAdapter<String> adapter;

Geocoder geocoder;
final static int maxResults = 5;
List<Address> locationList;
List<String> locationNameList;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listResult = (ListView)findViewById(R.id.resultlist);

handleIntent(getIntent());

geocoder = new Geocoder(this, Locale.ENGLISH);

locationNameList = new ArrayList<String>(); //empty in start
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, locationNameList);
listResult.setAdapter(adapter);
listResult.setOnItemClickListener(listResultOnItemClickListener);
}

@Override
protected void onNewIntent(Intent intent) {
setIntent(intent);
handleIntent(intent);
}

private void handleIntent(Intent intent) {
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
doSearch(query);
}
}

private void doSearch(String query){

try {
locationList = geocoder.getFromLocationName(query, maxResults);

if(locationList == null){
Toast.makeText(getApplicationContext(),
"locationList == null",
Toast.LENGTH_LONG).show();
}else{
if(locationList.isEmpty()){
Toast.makeText(getApplicationContext(),
"locationList is empty",
Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(),
"number of result: " + locationList.size(),
Toast.LENGTH_LONG).show();

locationNameList.clear();

for(Address i : locationList){
if(i.getFeatureName() == null){
locationNameList.add("unknown");
}else{
locationNameList.add(i.getFeatureName());

}
}

adapter.notifyDataSetChanged();
}
}
} catch (IOException e) {
Toast.makeText(getApplicationContext(),
"network unavailable or any other I/O problem occurs",
Toast.LENGTH_LONG).show();
e.printStackTrace();
}

String result ="Finished - " + query;

//I can't close search dialog, so I call it again to keep it active.
//Otherwise, user see the search dialog opened, but cannot search in seconf time.
onSearchRequested();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.search:
onSearchRequested();
return true;
default:
return false;
}
}

OnItemClickListener listResultOnItemClickListener =
new OnItemClickListener(){

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
openAddressDialog(locationList.get(position));
}
};

private void openAddressDialog(Address address){
AlertDialog.Builder addressDialog =
new AlertDialog.Builder(MainActivity.this);
addressDialog.setTitle(address.getFeatureName());
String msg =
"Country: " + address.getCountryName() + "\n"
+ "AdminArea: " + address.getAdminArea() + "\n"
+ "Longitude: " + address.getLongitude() + "\n"
+ "Latitude: " + address.getLatitude();

addressDialog.setMessage(msg);
addressDialog.show();
}

}


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