Search remote database Android app
Question
I want to create an Android app to be a search engine that can
- search my remote database from server like MAMP,
- list the search results and
- select one of the results to view details.
I have already set up the database.
Search.java - the launch page that shows only a search bar, allows user to search:
public class Search extends Activity implements OnClickListener{
private EditText searchterm;
private Button mSubmit;
private SharedPreferences preferences;
private String preFileName="searchrequest"; //this is the Preference file Name
private String prefKey="searchterm"; //Key to store the User Name
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script
//localhost :
private static final String SEARCH_URL = "http://xxx.xxx.x.xxx:8888/searchdb/search.php";
//ids
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
searchterm = (EditText)findViewById(R.id.searchterm);
mSubmit = (Button)findViewById(R.id.searchnow);
mSubmit.setOnClickListener(this);
preferences=getSharedPreferences(preFileName, MODE_PRIVATE);
if(!preferences.getString(prefKey, "not_set").equals("not_set")){
prefKey.setText(preferences.getString(preFileName, "not_set"));
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.searchnow:
new SearchQuery().execute();
break;
default:
break;
}
}
public class SearchQuery extends AsyncTask<String,String,String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Search.this);
pDialog.setMessage("Checking for records...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String searchquery = searchterm.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("searchquery", searchquery));
Log.d("request!", "starting");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
SEARCH_URL, "POST", params);
// full json response
Log.d("Search attempt", json.toString());
// json success element
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Successful Search!", json.toString());
//need help on how to save search data
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", MODE_PRIVATE);
Editor editor = pref.edit();
editor.putString("searchquery", searchquery);
editor.apply();
Intent i = new Intent(Search.this, Result.class);
startActivity(i);
return json.getString(TAG_MESSAGE);
}else{
Log.d("Invalid query. Please try again.", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(Search.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
Search.php:
<?php
@ $db = new mysqli('localhost','username','password','db');
if (mysqli_connect_errno()) {
echo 'Error: Could not connect to database.
Please try again later.';
exit;
}
if (!empty($_POST)) {
$query_params = array(
$term = $_POST['searchquery']
);
$words = explode(" ", trim($term));
$termArray = array();
foreach($words as $word){
if(!empty($word)){
$termArray[] = "+$word";
}
}
$searchinput = implode(" ", $termArray);
$query = "SELECT *
FROM repairsvc
WHERE MATCH(title,address,cat,brand,company)
AGAINST ('".$searchinput."' IN BOOLEAN MODE)
ORDER BY title ASC";
try {
$result = $db->query($query);
}
catch (PDOException $ex) {
// For testing, you could use a die and message.
//die("Failed to run query: " . $ex->getMessage());
//or just use this use this one to product JSON data:
$response["success"] = 0;
$response["message"] = "Database Error1. Please Try Again!";
die(json_encode($response));
}
//This will be the variable to determine whether or not the user's information is correct.
//we initialize it as false.
$num_results = $result->num_rows;
if ($num_results == 0)
{
$search_ok = false;
}
else
{$search_ok = true;}
if ($search_ok) {
$response["success"] = 1;
$response["message"] = "Search Successful!";
$response["records"] = array();
$records = array();
while ($row = $result->fetch_assoc()) {
$records[] = array('title'=>$row["title"], 'address'=>$row["address"],
'company'=>$row["company"], 'id'=>$row["id"], 'brand'=>$row["brand"]); // push into the array
}
var_dump($records);
// foreach ($records as $row) {
// echo "Outlet: ", $row['title'], "; Address: ", $row['address'];
// }
//update our repsonse JSON data
array_push($response["records"], $records);
// echoing JSON response
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "Invalid Search! Please try again.";
die(json_encode($response));
}
} else {
?>
<h1>Search</h1>
<form name="form1" action="search.php" method="post">
Enter Search:<br />
<input type="text" name="searchquery" id="searchquery" placeholder="Search a repair service"/>
<br /><br />
<input type="submit" value="Search Now" name="completedsearch" />
</form>
<?php
}
?>
Problems:
- How to save the search results from Search.java and let another activity Result.java to list results?
Save this from the php in first activity:
while ($row = $result->fetch_assoc()) {
$records[] = array('title'=>$row["title"], 'address'=>$row["address"],
'company'=>$row["company"], 'id'=>$row["id"], 'brand'=>$row["brand"]); // push into the array
}
//update our repsonse JSON data
array_push($response["records"], $records);
echo json_encode($response);
and put as listview in second activity (Result.java)??
- Result.java --> select one of the results in list view, how to get details by searching database by posting id of the item?
1 answers
solution1
0 ACCPTED 2015-03-03 09:30:44
I solved my question by putting this within Search.java to test whether can search:
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String searchquery = searchterm.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("searchquery", searchquery));
Log.d("request!", "starting");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
SEARCH_URL, "POST", params);
// full json response
Log.d("Search attempt", json.toString());
// json success element
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Successful Search!", json.toString());
//save search data
mCommentList = new ArrayList<HashMap<String, String>>();
mComments = json.getJSONArray(TAG_POSTS);
// JSONArray mComments = new JSONArray(TAG_POSTS);
// looping through all posts according to the json object returned
for (int i = 0; i < mComments.length(); i++) {
JSONArray innerArray = mComments.optJSONArray(i);
for (int j = 0; j < innerArray.length(); j++) {
JSONObject c = innerArray.getJSONObject(j);
//gets the content of each tag
String title = c.getString(TAG_TITLE);
String address = c.getString(TAG_ADDRESS);
String brand = c.getString(TAG_BRAND);
String company = c.getString(TAG_COMPANY);
String id = c.getString(TAG_ID);
//so our JSON data is up to date same with our array list
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_TITLE, title);
map.put(TAG_ADDRESS, address);
map.put(TAG_BRAND, brand);
map.put(TAG_COMPANY, company);
map.put(TAG_ID, id);
mCommentList.add(map);
}
}
Intent r = new Intent(Search.this, Results.class);
//either
//r.putExtra("arraylist", mCommentList);
// startActivityForResult(r, 5000);
//or
r.putExtra("searchquery", searchquery);
startActivity(r);
return json.getString(TAG_MESSAGE);
}else{
Log.d("Invalid Search!", json.toString());
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
Then in Results.java:
public void updateJSONdata() {
Bundle b = getIntent().getExtras();
String searchquery = b.getString("searchquery");
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("searchquery", searchquery));
Log.d("request!", "starting");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
SEARCH_URL, "POST", params);
// full json response
Log.d("Search attempt", json.toString());
try {
mResultList = new ArrayList<HashMap<String, String>>();
mResults = json.getJSONArray(TAG_POSTS);
// JSONArray mComments = new JSONArray(TAG_POSTS);
// looping through all posts according to the json object returned
for (int i = 0; i < mResults.length(); i++) {
JSONArray innerArray = mResults.optJSONArray(i);
for (int j = 0; j < innerArray.length(); j++) {
JSONObject c = innerArray.getJSONObject(j);
//gets the content of each tag
String title = c.getString(TAG_TITLE);
String address = c.getString(TAG_ADDRESS);
String brand = c.getString(TAG_BRAND);
String company = c.getString(TAG_COMPANY);
String id = c.getString(TAG_ID);
//so our JSON data is up to date same with our array list
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_TITLE, title);
map.put(TAG_ADDRESS, address);
map.put(TAG_BRAND, brand);
map.put(TAG_COMPANY, company);
map.put(TAG_ID, id);
mResultList.add(map);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Inserts the parsed data into our listview
*/
private void updateList() {
//if you choose the other method
// final ArrayList<HashMap<String, String>> mResultList = (ArrayList<HashMap<String, String>>) getIntent().getSerializableExtra("arraylist");
// System.out.println("...serialized data.."+mResultList);
Bundle b = getIntent().getExtras();
final String searchquery = b.getString("searchquery");
ListAdapter adapter = new SimpleAdapter(this, mResultList,
R.layout.single_result, new String[]{TAG_TITLE, TAG_ADDRESS, TAG_BRAND,
TAG_COMPANY, TAG_ID}, new int[]{R.id.outlet, R.id.address, R.id.brand,
R.id.company});
setListAdapter(adapter);
listView.setSelector(R.drawable.listselector);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// ListView Clicked item value
Map<String, String> map = (Map<String, String>) mResultList.get(position);
String record_id = map.get(TAG_ID);
Intent r = new Intent(Results.this, Record.class);
r.putExtra("key", record_id);
r.putExtra("searchquery", searchquery);
startActivity(r);
}
}
);
}
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