I have seen many request on forum
about web-service and android.Thought of sharing this sample
tutorial with you about how to use web-services in android.Following this tutorial you can
get an actual understanding about how to share data between mobile device and
web-services.
Lets us take an example of login
screen. Suppose user is sending request of login from mobile device to the
server.Server will verify the request
and will return response to the mobile device.Server can send response in
either XML or through soap object.
This tutorial will also
explain about request – response model using xml.
Step 1. Create layout for login screen:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@drawable/background">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="left"
android:layout_marginTop="10dip">
<TextView
android:text="@string/LoginHeading"
android:id="@+id/HeadingTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/white"
android:textStyle="bold"
android:layout_marginLeft="13dip">
</TextView>
</RelativeLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="10dip"
android:layout_marginTop="10dip"
android:background="@android:color/white"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:background="@android:color/white">
<TextView
android:text="User ID "
android:id="@+id/uNameTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textColor="#000000">
</TextView>
<EditText
android:id="@+id/userIDEditText"
android:layout_height="wrap_content"
android:layout_width="220dip"
android:inputType="text"
android:hint="USERID"
android:layout_marginLeft="20dip">
</EditText>
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="5dip"
android:background="@android:color/white"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:background="@android:color/white">
<TextView
android:text="@string/uPass"
android:id="@+id/uNPassTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textColor="#000000">
</TextView>
<EditText
android:id="@+id/passEditText"
android:layout_height="wrap_content"
android:layout_width="220dip"
android:inputType="textPassword"
android:hint="PASSWORD"
android:layout_marginLeft="15dip">
</EditText>
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="5dip"
android:background="@android:color/white"/>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="25dip"
android:gravity="center">
<Button
android:layout_width="150dip"
android:layout_height="wrap_content"
android:text="Login"
android:id="@+id/loginButton">
</Button>
<Button
android:layout_width="150dip"
android:layout_height="wrap_content"
android:text="Cancel"
android:id="@+id/cancelButton"
></Button>
</LinearLayout>
</LinearLayout>
Step 2. Create login Activity:-
Send login request to the server using login activity. Java code for activity likes,
public class LoginActivity extends Activity{
/*
* Global variables
*/
Button btnLogin =null;
Button btnCancel =null;
EditText uNameEditext =null;
EditText passEditext =null;
String iemiNumber = null;
Thread connectionThread = null;
LoginData loginData =null;
private Handler loginHandler = null;
private ProgressDialog progressDialog = null;
private AlertDialog alert = null;
ArrayList<ResponseData> responseData = null;
//public SharedPreferences timeStamp = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.loginscreen);
uNameEditext =(EditText)findViewById(R.id.userIDEditText);
passEditext =(EditText)findViewById(R.id.passEditText);
//Handler for progress dialog
loginHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
if(progressDialog.isShowing()){
progressDialog.dismiss();
}
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(LoginActivity.this);
alertDialogBuilder.setTitle("Login");
alertDialogBuilder.setMessage("The username or password you entered is incorrect");
alertDialogBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
//after testing
passEditext.setText("");
}
});
alert = alertDialogBuilder.create();
alert.setCancelable(false);
alert.show();
}
};
btnLogin=(Button)findViewById(R.id.loginButton);
btnLogin.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
doLogin();
}
});
btnCancel =(Button)findViewById(R.id.cancelButton);
btnCancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
private void doLogin(){
mUserName = userNameEditText.getText().toString();
mUserPswd = userPswdEditText.getText().toString();
if(mUserName.length() < 10){
Toast.makeText(LoginActivity.this, "Please check Mobile Number you have entered", Toast.LENGTH_SHORT).show();
return;
}
if(mUserPswd.length() < 1){
Toast.makeText(LoginActivity.this, "Password field can't be left blank!", Toast.LENGTH_SHORT).show();
return;
}
try{
progressDialog = ProgressDialog.show(this, "Connecting!", "Please wait . . .", true, true);
}catch (Exception e) {
// TODO: handle exception
}
if(mUserName.length() >= 10 && mUserPswd.length() > 0){
connectcionThread = new Thread(){
public void run(){
URL url;
try {
//User name and password is added to the URL
URL(loginUrl+"?name="+mUserName+"&password="+mUserPswd+"&deviceId="+mDeviceId.trim());
//Trying to connect with the server.
loginURLConnection = url.openConnection();
//Connection will be timed out in 5 seconds.
loginURLConnection.setConnectTimeout(9000);
//Getting XML data as input stream from server.
inputStream = loginURLConnection.getInputStream();
parseLoginResponseXML (new InputStreamReader(inputStream));
if(isSuccess){
progressDialog.dismiss();
openCategoryList();
}else{
progressDialog.dismiss();
myHandler.sendEmptyMessage(1);
}
inputStream.close();
loginURLConnection = null;
} catch (Exception e) {
loginResponseMessage = "Huh! Network Error, Can't connect to server, Please try again!";
myHandler.sendEmptyMessage(1);
}
}
};
connectcionThread.start();
//}
}
}
void parseLoginResponseXML(InputStreamReader inputStreamReader) {
// TODO Auto-generated method stub
if(inputStreamReader !=null){
//Implement parser logic here
}
}
}
In login activity ,I am adding entered username and password
to the base login url.I have use URLConnection class to send request to
server.We will get response in form of InputStream object.The response can be
simple xml file.We can parse response xml file.If response is true then allow
user to login into application.
Step 3.create manifest file:-
As we are using internet ,we need to mention internet permission
in manifest file like,
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.webservice"
android:versionCode="2"
android:versionName="2.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".LoginActivity"
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>
<uses-sdk android:minSdkVersion="3" />
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
Here I have tried to explain how to consume webservice in
android.Hope it is helpful.
Happy androing!!!!!
4 comments:
Thanks for uploading a new blog, but this stuff showed a lot of errors.
I went through a sample at:
http://sarangasl.blogspot.com/2011/10/android-web-service-access-tutorial.html
By changing this sample to my needs I got the "Login Successful" Response.
Now I want that after the successful login the next Activity that has to be an Application Form, should come from the .NET server in the form of XML file as Android support only XML Files as Layouts.
Can you help with that.
Thanks,
Harpreet.
Harpreet,
firstly above code won't work as it is for your case.This is working for my web service.
secondly,as you said you will get xml as response from server.you can parse the response xml and develop layout.
HI.
How should I do that stuff of xml?
Actually I have successfully Login and after that I sent the ServiceId as INT and get the response as STRING from soap service, but now the string contains the html code of the online form.
I used WebView to Load String Data in it and it showed the form successfully but it is just a static form, Form's functionality is not working.
Any Idea? I should do something in this HTML stuff or go for XML stuff?
check out how to use javascript in webview.
You can write javascript for your html component.
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