如何从android发送数据到mysql服务器？

我是android开发的新手。我正在使用 Android Studio。我正在制作一个应用程序，其中有一个名称下拉列表。选择任何名称后，相应的ID该名称显示在应用程序中。然后有一个按钮将搜索用户当前的 GPS 坐标并将其显示在应用程序上。我搜索了类似的问题并找到了一些链接（我将在最后发布）但我无法理解它们。以下是该应用程序的屏幕截图

我在mysql中有两个表；users and activity， 如下所示

Users

Activity

The UserId是活动表中的外键，即Id from users表将被插入其中。

我创建了以下脚本以将数据返回为 JSON：

<?php
    require_once ('config.php');

    $sql = "SELECT * FROM users";  
    $r = mysqli_query($con,$sql); 
    $result = array();

    while($row = mysqli_fetch_array($r)){
        array_push($result,array(
            'Id'=>$row['Id'],
            'Name'=>$row['Name']
        )); 
      }//end while

    echo json_encode(array('users'=>$result));

    mysqli_close($con);
?>

在我的应用程序代码中我创建了一个users class

用户等级

public class Users {

private String Id;
private String Name;

public String getId() {
    return Id;
}

public void setId(String id) {
    this.Id = id;
}

public String getName() {
    return Name;
}

public void setName(String name) {
    this.Name = name;
}}

JSON类

public class JSONfunctions {


public static JSONObject getJSONfromURL(String url)
{

    String json = "";
    JSONObject jsonObject = null;
    try
    {
        HttpClient httpClientt = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        HttpResponse httpResponse = httpClientt.execute(httpGet);
        BufferedReader br = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent()));
        StringBuffer sb = new StringBuffer();
        String line = "";
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }

        json = sb.toString();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try
    {
        jsonObject = new JSONObject(json);
    } catch (JSONException e) {
        e.printStackTrace();
    }

    return jsonObject;
}

主要活动

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

    _latitude = (TextView)findViewById(R.id.latitude);
    _longitude = (TextView)findViewById(R.id.longitude);
    btn_get_coordinates = (Button)findViewById(R.id.button);




    final PermissionListener permissionlistener = new PermissionListener() {
        @Override
        public void onPermissionGranted() {
            //Toast.makeText(MainActivity.this, "Permission Granted", Toast.LENGTH_SHORT).show();

            buildGoogleApiClient();
            //checkLocation(); //check whether location service is enable or not in your  phone
        }

        @Override
        public void onPermissionDenied(ArrayList<String> deniedPermissions) {
            Toast.makeText(MainActivity.this, "Permission Denied\n" + deniedPermissions.toString(), Toast.LENGTH_SHORT).show();
        }
    };

    btn_get_coordinates.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            new TedPermission(MainActivity.this)
                    .setPermissionListener(permissionlistener)
                    .setRationaleMessage("This app needs Permission to find your location")
                    .setPermissions(Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION)
                    .check();


        }
    });

    // Download JSON file AsyncTask
    new DownloadJSON().execute();
}

/////////////////////////////////////// Start of Location Services ///////////////////////////////////////////////////////

protected synchronized  void buildGoogleApiClient() {

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();

    if (mGoogleApiClient != null) {
        mGoogleApiClient.connect();
    } else
        Toast.makeText(this, "Not Connected!", Toast.LENGTH_SHORT).show();

}


/*Ending the updates for the location service*/
@Override
protected void onStop() {
    mGoogleApiClient.disconnect();
    super.onStop();
}

@Override
public void onConnected(@Nullable Bundle bundle) {
    settingRequest();
}

@Override
public void onConnectionSuspended(int i) {
    Toast.makeText(this, "Connection Suspended!", Toast.LENGTH_SHORT).show();
}

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
    Toast.makeText(this, "Connection Failed!", Toast.LENGTH_SHORT).show();
    if (connectionResult.hasResolution()) {
        try {
            // Start an Activity that tries to resolve the error
            connectionResult.startResolutionForResult(this, 90000);
        } catch (IntentSender.SendIntentException e) {
            e.printStackTrace();
        }
    } else {
        Log.i("Current Location", "Location services connection failed with code " + connectionResult.getErrorCode());
    }
}


/*Method to get the enable location settings dialog*/
public void settingRequest() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(10000);    // 10 seconds, in milliseconds
    mLocationRequest.setFastestInterval(1000);   // 1 second, in milliseconds
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
            .addLocationRequest(mLocationRequest);

    PendingResult<LocationSettingsResult> result =
            LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient,
                    builder.build());

    result.setResultCallback(new ResultCallback<LocationSettingsResult>() {

        @Override
        public void onResult(@NonNull LocationSettingsResult result) {
            final Status status = result.getStatus();
            final LocationSettingsStates state = result.getLocationSettingsStates();
            switch (status.getStatusCode()) {
                case LocationSettingsStatusCodes.SUCCESS:
                    // All location settings are satisfied. The client can
                    // initialize location requests here.
                    getLocation();
                    break;
                case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                    // Location settings are not satisfied, but this can be fixed
                    // by showing the user a dialog.
                    try {
                        // Show the dialog by calling startResolutionForResult(),
                        // and check the result in onActivityResult().
                        status.startResolutionForResult(MainActivity.this, 1000);
                    } catch (IntentSender.SendIntentException e) {
                        // Ignore the error.
                    }
                    break;
                case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                    // Location settings are not satisfied. However, we have no way
                    // to fix the settings so we won't show the dialog.
                    break;
            }
        }

    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    final LocationSettingsStates states = LocationSettingsStates.fromIntent(data);
    switch (requestCode) {
        case 1000:
            switch (resultCode) {
                case Activity.RESULT_OK:
                    // All required changes were successfully made
                    getLocation();
                    break;
                case Activity.RESULT_CANCELED:
                    // The user was asked to change settings, but chose not to
                    Toast.makeText(this, "Location Service not Enabled", Toast.LENGTH_SHORT).show();
                    break;
                default:
                    break;
            }
            break;
    }
}


public void getLocation() {
    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    } else {
        /*Getting the location after aquiring location service*/
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);

        if (mLastLocation != null) {
           // _progressBar.setVisibility(View.INVISIBLE);
            _latitude.setText("Latitude: " + String.valueOf(mLastLocation.getLatitude()));
            _longitude.setText("Longitude: " + String.valueOf(mLastLocation.getLongitude()));
        } else {
            /*if there is no last known location. Which means the device has no data for the loction currently.
            * So we will get the current location.
            * For this we'll implement Location Listener and override onLocationChanged*/
            Log.i("Current Location", "No data for location found");

            if (!mGoogleApiClient.isConnected())
                mGoogleApiClient.connect();

            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, MainActivity.this);
        }
    }
}



@Override
public void onLocationChanged(Location location) {

    mLastLocation = location;
    _progressBar.setVisibility(View.INVISIBLE);
    _latitude.setText("Latitude: " + String.valueOf(mLastLocation.getLatitude()));
    _longitude.setText("Longitude: " + String.valueOf(mLastLocation.getLongitude()));

}

//////////////////////////////////////////// End of Location services ///////////////////////////////////////////////


////////////////////////////////////////// Start of getting JSON DATA ///////////////////////////////////////////////

// Download JSON file AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void>
{

   /* @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(MainActivity.this);
        progressDialog.setMessage("Fetching Users....!");
        progressDialog.setCancelable(false);
        progressDialog.show();

    }*/

    @Override
    protected Void doInBackground(Void... params) {

        // Locate the Users Class
        users = new ArrayList<Users>();

        // Create an array to populate the spinner
        userList = new ArrayList<String>();
        // http://10.0.2.2:8000/MobileApp/index.php
        //http://10.0.2.2:8000/app/web/users/
        //http://192.168.100.8:8000/app/web/users/
        // JSON file URL address
        jsonObject = JSONfunctions.getJSONfromURL("http://192.168.100.15:8000/MobileApp/GET_DATA.php");

        try
        {
            JSONObject jobj = new JSONObject(jsonObject.toString());
            // Locate the NodeList name
            jsonArray = jobj.getJSONArray("users");

            for(int i=0; i<jsonArray.length(); i++)
            {
                jsonObject = jsonArray.getJSONObject(i);

                Users user = new Users();

                user.setId(jsonObject.optString("Id"));
                user.setName(jsonObject.optString("Name"));
                users.add(user);

                userList.add(jsonObject.optString("Name"));

            }
        } catch (JSONException e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }


        return null;
    }

    @Override
    protected void onPostExecute(Void args)
    {
        // Locate the spinner in activity_main.xml
        Spinner spinner = (Spinner)findViewById(R.id.spinner);

        // Spinner adapter
        spinner.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item, userList));

        // Spinner on item click listener

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                textViewResult = (TextView)findViewById(R.id.textView);

                // Set the text followed by the position

                textViewResult.setText("Hi " + users.get(position).getName() + " your ID is " + users.get(position).getId());

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                textViewResult.setText("");
            }
        });
    }


}
//////////////////////////////////////// End of getting JSON DATA //////////////////////////////////////////

当我按下保存按钮时，以下字段将被插入到Activity table

1. Id（这是自增）
2. UserId（用户表中基于所选名称的用户 ID）
3. Latitude（当前用户）
4. Longitude（当前用户）
5. DateTime（用户的日期时间）

我是否应该像我创建的那样创建一个“活动”类User class?

为此我有一些想法

1. 我会将数据保存到xml or txt首先创建文件，然后将其保存到数据库中。
2. 我应该将数据转换为json格式化然后保存到DB
3. 使用 my 中的查询直接将其保存到数据库中php script

这 3 个中哪一个最容易实现？如果有人能为我提供教程，那将非常有帮助，尽管我看到了其中很多（1 https://stackoverflow.com/a/32200552/6854117 , ）并且如上所述我无法理解它们:(。

我被困住了，不知道自己必须做什么。任何帮助将不胜感激。

您需要编写 Api，您可以在其中传递来自 android 的数据，并在 Api 中获取该数据并使用插入查询存储在数据库中。在 Android 端，你必须执行以下代码：

我的类 PutUtility 用于 getData()、PostData、DeleteData()。你只需要更改包名称

package fourever.amaze.mics;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;


public class PutUtility {

    private Map<String, String> params = new HashMap<>();
    private static HttpURLConnection httpConnection;
    private static BufferedReader reader;
    private static String Content;
    private StringBuffer sb1;
    private StringBuffer response;

    public void setParams(Map<String, String> params) {
        this.params = params;
    }

    public void setParam(String key, String value) {
        params.put(key, value);
    }

    public String getData(String Url) {


        StringBuilder sb = new StringBuilder();

        try {
            // Defined URL  where to send data

            URL url = new URL(Url);

            URLConnection conn = null;
            conn = url.openConnection();

            // Send POST data request
            httpConnection = (HttpURLConnection) conn;
            httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            httpConnection.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(
                    new InputStreamReader(httpConnection.getInputStream()));
            String inputLine;
            response = new StringBuffer();



            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                reader.close();
            } catch (Exception ex) { }
        }

        return response.toString();
    }


    public String postData(String Url) {


        StringBuilder sb = new StringBuilder();
        for (String key : params.keySet()) {
            String value = null;
            value = params.get(key);


            if (sb.length() > 0) {
                sb.append("&");
            }
            sb.append(key + "=" + value);
        }

        try {
            // Defined URL  where to send data

            URL url = new URL(Url);

            URLConnection conn = null;
            conn = url.openConnection();

            // Send POST data request
            httpConnection = (HttpURLConnection) conn;
            httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            httpConnection.setRequestMethod("POST");
            httpConnection.setDoInput(true);
            httpConnection.setDoOutput(true);
            OutputStreamWriter wr = null;

            wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(sb.toString());
            wr.flush();

            BufferedReader in = new BufferedReader(
                    new InputStreamReader(httpConnection.getInputStream()));
            String inputLine;
            response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {

                reader.close();
            } catch (Exception ex) {
            }
        }


        return response.toString();
    }


    public String putData(String Url) {


        StringBuilder sb = new StringBuilder();
        for (String key : params.keySet()) {
            String value = null;
            try {
                value = URLEncoder.encode(params.get(key), "UTF-8");
                if (value.contains("+"))
                    value = value.replace("+", "%20");

                //return sb.toString();


                // Get the server response

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

            if (sb.length() > 0) {
                sb.append("&");
            }
            sb.append(key + "=" + value);
        }

        try {
            // Defined URL  where to send data

            URL url = new URL(Url);

            URLConnection conn = null;
            conn = url.openConnection();

            // Send PUT data request
            httpConnection = (HttpURLConnection) conn;
            httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            httpConnection.setRequestMethod("PUT");
            httpConnection.setDoInput(true);
            httpConnection.setDoOutput(false);
            OutputStreamWriter wr = null;

            wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(sb.toString());
            wr.flush();

            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            ;
            String line = null;

            // Read Server Response
            while ((line = reader.readLine()) != null) {
                // Append server response in string
                sb1.append(line + " ");
            }

            // Append Server Response To Content String
            Content = sb.toString();


        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {

                reader.close();
            } catch (Exception ex) {
            }
        }
        // Send PUT data request
        return Url;

    }


    public String deleteData(String Url) {


        StringBuilder sb = new StringBuilder();
        for (String key : params.keySet()) {

            try {
                // Defined URL  where to send data

                URL url = new URL(Url);

                URLConnection conn = null;
                conn = url.openConnection();

                // Send POST data request
                httpConnection = (HttpURLConnection) conn;
                httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                httpConnection.setRequestMethod("DELETE");
                httpConnection.connect();


                reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

                String line = null;

                // Read Server Response
                while ((line = reader.readLine()) != null) {
                    // Append server response in string
                    sb1.append(line + " ");
                }

                // Append Server Response To Content String
                Content = sb.toString();


            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {

                    reader.close();
                } catch (Exception ex) {
                }
            }



        }
        return Url;

    }

并像这样使用这个类。此类自动进行互联网连接并给您来自服务器的响应：

    private class ServiceLogin extends AsyncTask<String, Void, String> {

            ProgressDialog mProgressDialog;
            private String res;

            @Override
            protected void onPreExecute() {
                mProgressDialog = ProgressDialog.show(LoginActivity.this,
                        "", "Please wait...");
            }

            @Override
            protected String doInBackground(String... params) {
                res = null;
                PutUtility put = new PutUtility();

                put.setParam("UserId", params[0].toString());
                put.setParam("Latitude", params[1].toString());
                put.setParam("Longitude", params[2].toString());
                put.setParam("DateTime", params[3].toString());

                try {
                    res = put.postData("INSERT URL of API HERE");
                    Log.v("res", res);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return res;

            }

            protected void onPostExecute(String res) {
                //"Here you get response from server in res"

            }
        }

现在您可以通过单击按钮调用此服务并在服务中插入数据，如下所示：

new ServiceLogin().execute(pass four parameters here);

希望这对您有帮助

EDIT:

这是用于插入数据的简单 PHP Api

<?php include('connection.php');

$return_arr = array();

 $UserId=($_POST['UserId']);
 $Latitude=($_POST['Latitude']);
 $Longitude=($_POST['Longitude']);
$DateTime=($_POST['DateTime']);


        $user_register_sql1 = "INSERT INTO `activity`(`Id`,`UserId`, `Latitude`,`Longitude`,`DateTime`) values (NULL,'".$UserId."','".$Latitude."','".$Longitude."','".$DateTime."')"; 
             mysql_query($user_register_sql1);
             $row_array['errorcode1'] = 1; 

}
?>