Question

I have created like get parameter in php And I am using Get method to submit to the link. For eg: “http://example.com/subscribe/?act=SubscribeForEmail&EmailAddress=” .

if user type in edittext(say [e-mail]) and submit, it will submit as

http://example.com/subscribe/?act=SubscribeForEmail&EmailAddress=[e-mail]. How it’s

possible in android?

I tried by using this by an example. But it force closes

The code is as follows:

EditText Ename;
Button btncreate;
String n = null;
String contentOfMyInputStream1;
String output = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Ename = (EditText)findViewById(R.id.msgTextField);
    btncreate = (Button)findViewById(R.id.sendButton);
    btncreate.setOnClickListener(this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onClick(View v) {   
    String st1;
    st1 = Ename.getText().toString();
    try {
        output = "http://example.com/subscribe/?act=SubscribeForEmail&EmailAddress="+st1;
        downloadUrl(output);//request been send
    } 
    catch (IOException e) {
        e.printStackTrace();
    }
    if (output != null) {
        Toast.makeText(this, output, Toast.LENGTH_SHORT).show();
    }
}

public String downloadUrl(String url) throws IOException {
    HttpClient httpclient = new DefaultHttpClient();
    HttpRequestBase httpRequest = null;
    HttpResponse httpResponse = null;
    InputStream inputStream = null;
    String response = "";
    StringBuffer buffer = new StringBuffer();
    httpRequest = new HttpGet(url); 
    httpResponse = httpclient.execute(httpRequest);
    inputStream = httpResponse.getEntity().getContent();
    int contentLength = (int) httpResponse.getEntity().getContentLength();
    if (contentLength < 0)  {
        // Log.e(TAG, "The HTTP response is too long.");
    }
    byte[] data = new byte[256];
    int len = 0;
    while (-1 != (len = inputStream.read(data)) ) {
        buffer.append(new String(data, 0, len));
    }
    inputStream.close();
    response = buffer.toString();
    return response;
}

I am getting error as

Fatal Exception:main
android.os.NetworkOnMainTreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at java.net.InetAddress.lookHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:385)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)

Please help me to solve the issue.

Thanks in Advance.

Answer 1

As simple as the Exception tells you. You run network stuff on the main Thread. Use AsyncTask or a new Thread to execute your downloadUrl method.

Use this example code, taken from here:

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

      @Override
      protected String doInBackground(String... params) {
            //Here you put your downloadUrl() method.
            //because this method does stuff in background
            return downloadUrl(params[0])
      }      

      @Override
      protected void onPostExecute(String output) {
          //after downloading is finished, toast it.
          if (output != null)
              Toast.makeText(this, output, Toast.LENGTH_SHORT).show();
      }

      @Override
      protected void onPreExecute() {
      }

      @Override
      protected void onProgressUpdate(Void... values) {
      }
}   

Call it by these two lines:

LongOperation downloadTask = new LongOperation();
downloadTask.execute(output);

This site might help as well.