CODEWITHSUNDEEP
android
LuxuryMode
LuxuryMode

Reputation: 33741

Using logcat: a bit confused here :(

I'm new to using logcat and debugging in Android. I've analyzing someone else's code which looks like this:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class RestClient {



    private static String convertStreamToString(InputStream is) {
        /*
         * To convert the InputStream to String we use the BufferedReader.readLine()
         * method. We iterate until the BufferedReader return null which means
         * there's no more data to read. Each line will appended to a StringBuilder
         * and returned as String.
         */
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

    /* This is a test function which will connects to a given
     * rest service and prints it's response to Android Log with
     * labels "Praeda".
     */
    public static void connect(String url)
    {

        HttpClient httpclient = new DefaultHttpClient();

        // Prepare a request object
        HttpGet httpget = new HttpGet(url); 

        // Execute the request
        HttpResponse response;
        try {
            response = httpclient.execute(httpget);
            // Examine the response status
            Log.i("Praeda",response.getStatusLine().toString());

            // Get hold of the response entity
            HttpEntity entity = response.getEntity();
            // If the response does not enclose an entity, there is no need
            // to worry about connection release

            if (entity != null) {

                // A Simple JSON Response Read
                InputStream instream = entity.getContent();
                String result= convertStreamToString(instream);
                Log.i("Praeda",result);

                // A Simple JSONObject Creation
                JSONObject json=new JSONObject(result);
                Log.i("Praeda","<jsonobject>\n"+json.toString()+"\n</jsonobject>");

                // A Simple JSONObject Parsing
                JSONArray nameArray=json.names();
                JSONArray valArray=json.toJSONArray(nameArray);
                for(int i=0;i<valArray.length();i++)
                {
                    Log.i("Praeda","<jsonname"+i+">\n"+nameArray.getString(i)+"\n</jsonname"+i+">\n"
                            +"<jsonvalue"+i+">\n"+valArray.getString(i)+"\n</jsonvalue"+i+">");
                }

                // A Simple JSONObject Value Pushing
                json.put("sample key", "sample value");
                Log.i("Praeda","<jsonobject>\n"+json.toString()+"\n</jsonobject>");

                // Closing the input stream will trigger connection release
                instream.close();
            }


        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }


}

How do I run this so I can watch the log? Do I need to actually have an activity which calls the function or....? I'm so confused....

Upvotes: 0

Views: 2556

Answers (3)

user600838
user600838

Reputation:

Yes, you need to invoke the static method from an Activity (e.g., Hello World). Once the Activity is running, you can monitor the Activity's log output from logcat (using DDMS or adb).

Upvotes: 2

Vikas Patidar
Vikas Patidar

Reputation: 43349

Yes, you need to create a new activity and have to call this static method connect(String url)

RestClient.connect("http://www.example.com");

Further, for the logcat output click on the i in LogCat View.

Upvotes: 1

Heather
Heather

Reputation: 73

Run this as an Android application. Click on DDMS icon at the top corner of Eclipse . Click on LogCat in the next window. Alternatively, OPEN-> perspective (or view on the toolbar) ->Logcat .

Upvotes: 1

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