所以我一直在关注如何将android连接到MySQL db的教程。我做了一切，但没有奏效。当我在chrome中输入它的位置时，PHP文件有效 - ＆gt;它以JSON格式显示了数组。但是，在android中它不起作用可能是因为我在本地服务器上托管该文件。有什么帮助吗？
感谢。
机器人：
package com.example.mohammadel_ghali.icare;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
public class login extends AppCompatActivity {
String JSON_STRING ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
}
public void getJSON(View view){
new BackgroundTask().execute();
}
private class BackgroundTask extends AsyncTask<Void, Void, String> {
String JSON_URL;
@Override
protected void onPreExecute() {
JSON_URL ="10.0.2.2/ApplicationDemoNewNew/admin/android/json_get_login.php";
}
@Override
protected String doInBackground(Void... voids) {
try {
StringBuilder JSON_DATA = new StringBuilder();
URL url = new URL(JSON_URL);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream in = httpURLConnection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
while ((JSON_STRING = reader.readLine())!=null) {
JSON_DATA.append(JSON_STRING).append("\n");
}
return JSON_DATA.toString().trim();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
TextView json = (TextView) findViewById(R.id.tv_result);
json.setText(result);
}
}
}
PHP：
<?php
$mysql_host='localhost';
$mysql_user='root';
$mysql_password='root123';
$con = @mysqli_connect($mysql_host,$mysql_user,$mysql_password);
if(!$con){
die('Failed to connect to the database');//if not successful
}else{
//echo "Successfully connected to MySQL!";//if successful
if(@mysqli_select_db($con, 'application_database')){//selecting the database
//echo '<br>'."Connected to the specified database!";
}else{
die('<br>'."Could not connect to the specified database!");
}
}
$sql = "select * from users;";
$result = mysqli_query($con,$sql);
$response = array();
while($row = mysqli_fetch_array($result)){
array_push($response, array("id"=>$row[0],"username"=>$row[1],"password"=>$row[2],"first_name"=>$row[3],"last_name"=>$row[4]));
}
echo json_encode(array("server_response"=>$response));
mysqli_close($con);
?>
答案 0 :(得分：0)
这是我的整个类，它接收一个JSON文件......
我通过NFL提供的json，我抓住了球队和得分
private class GetWeekScores extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
Toast.makeText(getApplication(),"Json Data is downloading",Toast.LENGTH_LONG).show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler httpHandler = new HttpHandler();
// Making a request to url and getting response
for (int i = 0; i <list.size(); i++) {
String url = NFL_LIVEUPDATE_URL + list.get(i) + "/" + list.get(i) + "_gtd.json";
String jsonStr = httpHandler.makeServiceCall(url);
Log.e(TAG, "Response from url: " + url);
if (jsonStr != null) {
try {
JSONObject id = new JSONObject(jsonStr);
JSONObject home = new JSONObject(jsonStr);
JSONObject away = new JSONObject(jsonStr);
// Getting JSON Array node
final JSONObject getid = id.getJSONObject(list.get(i));
JSONObject homeScore = getid.getJSONObject("home");
JSONObject homeScore2 = homeScore.getJSONObject("score");
homeTeamABBR = homeScore.getString("abbr");
getHomeScore = homeScore2.getString("T");
JSONObject awayScore = getid.getJSONObject("away");
JSONObject awayScore2 = awayScore.getJSONObject("score");
awayTeamABBR = awayScore.getString("abbr");
getAwayScore = awayScore2.getString("T");
HashMap<String, String> homeaway = new HashMap<>();
homeaway.put("matchup", awayTeamABBR + "vs" + homeTeamABBR);
homeaway.put("homeScore", homeTeamABBR + "->" + getHomeScore + " points ");
homeaway.put("awayScore", awayTeamABBR + "->" + getAwayScore + " points ");
if (Integer.parseInt(getHomeScore) > Integer.parseInt(getAwayScore)) {
homeaway.put("winner", homeTeamABBR);
} else {
homeaway.put("winner", awayTeamABBR);
}
gameIDList.add(homeaway);
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
});
}
} else {
MethodContants.showLog(TAG, "JSON File does not exist from NFL", true);
// runOnUiThread(new Runnable() {
// @Override
// public void run() {
// Toast.makeText(getApplicationContext(),
// "Couldn't get json from server. Check LogCat for possible errors!",
// Toast.LENGTH_LONG).show();
// }
// });
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
MethodContants.showLog(TAG, "Number of games being parsed through: " + list.size(), false);
for (int i = 0; i < gameIDList.size(); i++){
System.out.println(gameIDList.get(i).get("matchup") + " -> " + gameIDList.get(i).get("homeScore") + "-> " + gameIDList.get(i).get("awayScore") + ". " + gameIDList.get(i).get("winner") + " WON!");
}
}
}
我不确定你的PHP文件还有什么用，但是如果你只需要来自JSON的信息，那么就创建一个JSON文件......不需要创建PHP文件。
我忘了添加HttpHandler类。
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}