Verbinden Sie Android mit dem Server im kostenlosen Webhost

Ja, Sie können aber kleine Probleme beim Abrufen von Daten haben, zum Beispiel

PHP:

<?php
header("Content-type: application/json; charset=utf-8");
mb_internal_encoding('UTF-8');
mb_http_output('UTF-8');
$hostname='mysql2.000webhost.com';
$username='a3067857_admin';
$password='xxxxxxxxx';
$response = array();
try {

    $dbh=new PDO("mysql:host=$hostname;dbname=a7769372_db",$username  ,$password);

    $response["allname"] = array();

    /*** QUERY ****/
    $sql='SELECT * FROM my_table';

    $stmt=$dbh->query($sql);

    $objs = $stmt->fetchAll(PDO::FETCH_OBJ);

    foreach($objs as $object) {
        $news = array();        
        $news["id"]=$object->id;
        $news["Name"]=$object->name;

        array_push($response["allname"], $news);
    }

    echo json_encode($response);

    /*** close connection ***/
    $dbh=null;

}catch(PDOException $e) {
 echo $e->getMessage();
}
?>

Meine Ausgabe:

{"allname":[{"id":"1","Name":"sadegh"},{"id":"2","Name":"saleh"}]}
<!-- Hosting24 Analytics Code -->
<script type="text/javascript" src="http://stats.hosting24.com/count.php"></script>
<!-- End Of Analytics Code -->

Kostenlose Hosts haben ein kleines Problem, wenn sie ein Skript in der Ausgabe anzeigen. Sie müssen das Skript in der Ausgabe entfernen und der verbleibende Teil wird in einer Variablen gespeichert. Verwenden Sie dann diese Variable, um Daten von JSON abzurufen.

Zuerst werden die meisten Leute diesen Code entfernen:

<!-- Hosting24 Analytics Code -->
<script type="text/javascript" src="http://stats.hosting24.com/count.php"></script>
<!-- End Of Analytics Code -->

Zum Beispiel verwende ich GetData(), um Daten aus der PHP-Datei abzurufen und den zusätzlichen Code zu entfernen:

public void GetData(){
    class GetDataJSON extends AsyncTask<String, Void, String>{

        @Override
        protected String doInBackground(String... params) {
            DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
            HttpPost httppost = new HttpPost("http://sheikhoo.net46.net/getname.php");
            Log.i("LOG", "HttpPost -> getname.php");
            // Depends on your web service
            httppost.setHeader("Content-type", "application/json");

            InputStream inputStream = null;
            String result = null;
            Log.i("LOG", inputStream + "," + result);
            try {
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();

                inputStream = entity.getContent();
                // json is UTF-8 by default
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();

                String line = null;
                while ((line = reader.readLine()) != null)
                {
                    sb.append(line + "\n");
                }
                result = sb.toString();
                Log.i("LOG", result);
            } catch (Exception e) {
                // Oops
                Log.i("LOG", " error ");
            }
            finally {
                try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
            }
            Log.i("LOG", " result: " + result);
            /*****************remove script***********************/
            String s = result;
            int position = s.indexOf("}]}"); 

            s=s.substring(0, position + 3);
            /****************************************************/
            return s;
        }

        @Override
        protected void onPostExecute(String result){
            Log.i("LOG", " onPostExecute -> " + result );
            myJSON=result;
            Log.i("LOG", "myJSON" + myJSON);
        }
    }
    GetDataJSON g = new GetDataJSON();
    Log.i("LOG", " GetDataJSON " );
    g.execute();
}

Jetzt können Sie Daten aus myJSON extrahieren Variable

meinJSON :

{"allname":[{"id":"1","Name":"sadegh"},{"id":"2","Name":"saleh"}]}

Vollständiger Code zum Abrufen von Daten aus PHP und Anzeigen in der Listenansicht:

Zuerst müssen Sie <uses-permission android:name="android.permission.INTERNET" /> hinzufügen zu AndroidManifest.xml für Internetverbindung.

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="ir.sheikhoo.freehost"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />

    <!--  Internet Permissions -->
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            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>

Fügen Sie dann list_item.xml hinzu zu projizieren:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

und Listenansicht zu activity_main.xml hinzufügen :

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="ir.sheikhoo.freehost.MainActivity" >


    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" >
    </ListView>

</RelativeLayout>

Jetzt in MainActivity.java Daten mit GetData() abrufen und zeigen Sie Daten in ListView mit ShowNameList() .

public class MainActivity extends ActionBarActivity {

    String myJSON;

    private static final String TAG_ALLNAME="allname";
    private static final String TAG_ID = "id";
    private static final String TAG_NAME = "Name";

    JSONArray jname = null;

    ArrayList<HashMap<String, String>> nameList;

    ListView list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i("LOG", "Start <-- ");
        list = (ListView) findViewById(R.id.listView);
        nameList = new ArrayList<HashMap<String,String>>();
        Log.i("LOG", "GetData <-- ");

        GetData();
    }

    public void GetData(){
        class GetDataJSON extends AsyncTask<String, Void, String>{

            @Override
            protected String doInBackground(String... params) {
                DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
                HttpPost httppost = new HttpPost("http://sheikhoo.net46.net/getname.php");
                Log.i("LOG", "HttpPost -> getname.php");
                // Depends on your web service
                httppost.setHeader("Content-type", "application/json");

                InputStream inputStream = null;
                String result = null;
                Log.i("LOG", inputStream + "," + result);
                try {
                    HttpResponse response = httpclient.execute(httppost);
                    HttpEntity entity = response.getEntity();

                    inputStream = entity.getContent();
                    // json is UTF-8 by default
                    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
                    StringBuilder sb = new StringBuilder();

                    String line = null;
                    while ((line = reader.readLine()) != null)
                    {
                        sb.append(line + "\n");
                    }
                    result = sb.toString();
                    Log.i("LOG", result);
                } catch (Exception e) {
                    // Oops
                    Log.i("LOG", " error ");
                }
                finally {
                    try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
                }
                Log.i("LOG", " result: " + result);
                /*****************remove script***********************/
                String s = result;
                int position = s.indexOf("}]}"); 

                s=s.substring(0, position + 3);
                /****************************************************/
                return s;
            }

            @Override
            protected void onPostExecute(String result){
                Log.i("LOG", " onPostExecute -> " + result );
                myJSON=result;
                Log.i("LOG", "myJSON" + myJSON);
                //
                ShowNameList();
            }
        }
        GetDataJSON g = new GetDataJSON();
        Log.i("LOG", " GetDataJSON " );
        g.execute();
    }

    protected void ShowNameList(){
        try {
            Log.i("LOG", " showList " );
            //if(myJSON!=null){
                JSONObject jsonObj = new JSONObject(myJSON);
                jname = jsonObj.getJSONArray(TAG_ALLNAME);

                for(int i=0;i<jname.length();i++){
                    JSONObject c = jname.getJSONObject(i);
                    String id = c.getString(TAG_ID);
                    String name = c.getString(TAG_NAME);

                    Log.i("Ekhteraat app ControlPanel", id);

                    HashMap<String,String> lname = new HashMap<String,String>();

                    lname.put(TAG_ID,id);
                    lname.put(TAG_NAME,name);

                    nameList.add(lname);
                //}

                    Log.i("LOG", "Name -> " + id + " " +  name);
                    //setNewNews;
                    ;

                    ListAdapter adapter = new SimpleAdapter(
                            MainActivity.this, nameList, R.layout.list_item,
                            new String[]{TAG_ID,TAG_NAME},
                            new int[]{R.id.id, R.id.name}
                    );
                    list.setAdapter(adapter);
                }


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

    }
}

Bild:

Um Daten an MySQL zu senden, erstellen Sie zuerst PHP-Code, um Daten an MySQL einzufügen.

(» Ich füge eine Nachricht hinzu, um zu zeigen, was in der App passiert)

PHP:

<?php
header("Content-type: application/json; charset=utf-8");
mb_internal_encoding('UTF-8');
mb_http_output('UTF-8');

$hostname='mysql2.000webhost.com';
$username='a3067857_admin';
$password='xxxxxxxxx';

try {

    $dbh=new PDO("mysql:host=$hostname;dbname=a7769372_db;charset=utf8mb4",$username,$password);


    /*** QUERY ****/

    $statement = $dbh->prepare("INSERT INTO a7769372_db.my_table (name) VALUES (:Name);");

    if ($statement->execute(array(':Name' => $_POST['Name']))) {
        echo "executed";
    } else {
        echo "not executed";
    }

    /*** close connection ***/
    $dbh=null;

}catch(PDOException $e) {
 echo $e->getMessage();
}
?> 

Tabelle in MySQL erstellen

» Da wir nur den Namen senden, sollte die ID AUTO_INCREMENT sein in phpMyAdmin.

SQL

CREATE TABLE my_table
(
    id int NOT NULL AUTO_INCREMENT,
    name varchar(255) NOT NULL,
    PRIMARY KEY (id)
)

Erstellen Sie dann eine neue Aktivität und fügen Sie EditText hinzu ,Button

activity_send.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="ir.sheikhoo.freehost.SendActivity" >

    <EditText
        android:id="@+id/Name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/textView1"
        android:layout_marginLeft="14dp"
        android:layout_toRightOf="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="Name :" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/Name"
        android:layout_marginTop="21dp"
        android:text="Send" />

</RelativeLayout>

SendActivity.java:

public class SendActivity extends ActionBarActivity {

    EditText ed_name;

    String myJSON;

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

        ed_name=(EditText) findViewById(R.id.Name);
        Button btn=(Button) findViewById(R.id.button1);

        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                if(!ed_name.getText().toString().matches("")){
                    SendData();
                }else{
                    Toast.makeText(getBaseContext(),"Name NULL",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    public void SendData(){
        class GetDataJSON extends AsyncTask<String, Void, String>{

            private ProgressDialog Dialog;
            private InputStream is = null;
            private String url = "http://sheikhoo.net46.net/sendname.php";
            private String page_output = "";

            @Override
            protected void onPreExecute(){
                super.onPreExecute();
                Dialog = new ProgressDialog(SendActivity.this);
                Dialog.setTitle("Contacting Servers");
                Dialog.setMessage("Logging in ...");
                Dialog.setIndeterminate(false);
                Dialog.setCancelable(true);
                Dialog.show();
            }

            @Override
            protected String doInBackground(String... args) {

                try {
                        // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("Name", ed_name.getText().toString()));
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
                Toast.makeText(getBaseContext(),"Error To Connect",
                    Toast.LENGTH_SHORT).show();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
                Toast.makeText(getBaseContext(),"Error To Connect",
                    Toast.LENGTH_SHORT).show();
            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(getBaseContext(),"Error To Connect",
                    Toast.LENGTH_SHORT).show();
            }
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();

                String line = null;
                while ((line = reader.readLine()) != null)
                {
                    sb.append(line + "\n");
                }
                is.close();
                page_output = sb.toString();

                Log.i("LOG", "page_output --> " + page_output); ///<--------------------------|
            /*****************remove script***********************/
            String s = page_output;
            int position = s.indexOf("<"); 

            s=s.substring(0, position - 1);

            page_output=s;
            /****************************************************/
            } catch (Exception e) {
                Log.e("Buffer Error", "Error converting result " + e.toString());
                Toast.makeText(getBaseContext(),"Buffer Error",
                    Toast.LENGTH_SHORT).show();
            }

            return page_output;
        }

            @Override
            protected void onPostExecute(String result){
                Dialog.dismiss();

                Log.i("LOG", " onPostExecute -> " + result );
                myJSON=result;
                Log.i("LOG", "myJSON" + myJSON);

                if(myJSON.trim().equals("executed")){
                    Toast.makeText(getBaseContext(),"Name Save in DB",
                        Toast.LENGTH_SHORT).show();
                    ed_name.setText("");
                }else{
                    Toast.makeText(getBaseContext(),"Error Name don't Save in DB",
                        Toast.LENGTH_SHORT).show();
            }
            }
        }
        GetDataJSON g = new GetDataJSON();
        Log.i("LOG", " GetDataJSON " );
        g.execute();
    }
}

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