كيف أربط تطبيق اندرويد بـ webservice؟

سأقدم هنا مثال عمل لربط التطبيق بـ Webservice عن طريقبروتوكول SOAP:

Layout XML:

<?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="wrap_content"
    android:orientation="vertical" >
 
    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center"
        android:text="Celsius to Farenheit"
        android:textSize="30dp" />
 
    <EditText
        android:id="@+id/editText1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:numeric="integer"
        android:singleLine="true" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:gravity="center"
        android:text="Convert to Farenheit" />
 
    <TextView
        android:id="@+id/tv_result"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="" android:textSize="26dp"/>
 
</LinearLayout>

التصميم سيكون كالآتي:

أنشيء objects في WebserviceActivity:

private final String NAMESPACE = "http://www.w3schools.com/webservices/";
private final String URL = "http://www.w3schools.com/webservices/tempconvert.asmx";
private final String SOAP_ACTION = "http://www.w3schools.com/webservices/CelsiusToFahrenheit";
private final String METHOD_NAME = "CelsiusToFahrenheit";
private String TAG = "PGGURU";
private static String celcius;
private static String fahren;
Button b;
TextView tv;
EditText et;

وظيفة onCreate():

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //Celcius Edit Control
    et = (EditText) findViewById(R.id.editText1);
    //Fahrenheit Text control
    tv = (TextView) findViewById(R.id.tv_result);
    //Button to trigger web service invocation
    b = (Button) findViewById(R.id.button1);
    //Button Click Listener
    b.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            //Check if Celcius text control is not empty
            if (et.getText().length() != 0 && et.getText().toString() != "") {
                //Get the text control value
                celcius = et.getText().toString();
                //Create instance for AsyncCallWS
                AsyncCallWS task = new AsyncCallWS();
                //Call execute 
                task.execute();
            //If text control is empty
            } else {
                tv.setText("Please enter Celcius");
            }
        }
    });
}

Class AsyncCallWS:

private class AsyncCallWS extends AsyncTask<String, Void, Void> {
        @Override
        protected Void doInBackground(String... params) {
            Log.i(TAG, "doInBackground");
            getFahrenheit(celcius);
            return null;
        }
 
        @Override
        protected void onPostExecute(Void result) {
            Log.i(TAG, "onPostExecute");
            tv.setText(fahren + "° F");
        }
 
        @Override
        protected void onPreExecute() {
            Log.i(TAG, "onPreExecute");
            tv.setText("Calculating...");
        }
 
        @Override
        protected void onProgressUpdate(Void... values) {
            Log.i(TAG, "onProgressUpdate");
        }
 
    }

getFahrenheit():

public void getFahrenheit(String celsius) {
    //Create request
    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    //Property which holds input parameters
    PropertyInfo celsiusPI = new PropertyInfo();
    //Set Name
    celsiusPI.setName("Celsius");
    //Set Value
    celsiusPI.setValue(celsius);
    //Set dataType
    celsiusPI.setType(double.class);
    //Add the property to request object
    request.addProperty(celsiusPI);
    //Create envelope
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
            SoapEnvelope.VER11);
    envelope.dotNet = true;
    //Set output SOAP object
    envelope.setOutputSoapObject(request);
    //Create HTTP call object
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
 
    try {
        //Invole web service
        androidHttpTransport.call(SOAP_ACTION, envelope);
        //Get the response
        SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
        //Assign it to fahren static variable
        fahren = response.toString();
 
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Internet permission:

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

لعمل webService مع Json: