android-post-json

android-post-json

android-post-json/src/com/hmkcode/android/MainActivity.java

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+package com.hmkcode.android;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.json.JSONObject;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+import android.app.Activity;
+import com.hmkcode.android.vo.Person;
+
+public class MainActivity extends Activity implements OnClickListener {
+
+	TextView tvIsConnected;
+	EditText etName,etCountry,etTwitter;
+	Button btnPost;
+
+	Person person;
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.activity_main);
+		
+		// get reference to the views
+		tvIsConnected = (TextView) findViewById(R.id.tvIsConnected);
+		etName = (EditText) findViewById(R.id.etName);
+		etCountry = (EditText) findViewById(R.id.etCountry);
+		etTwitter = (EditText) findViewById(R.id.etTwitter);
+		btnPost = (Button) findViewById(R.id.btnPost);
+		
+		// check if you are connected or not
+		if(isConnected()){
+			tvIsConnected.setBackgroundColor(0xFF00CC00);
+			tvIsConnected.setText("You are conncted");
+        }
+		else{
+			tvIsConnected.setText("You are NOT conncted");
+		}
+		
+		// add click listener to Button "POST"
+		btnPost.setOnClickListener(this);
+		
+		
+	}
+
+	public static String POST(String url, Person person){
+		InputStream inputStream = null;
+		String result = "";
+		try {
+			
+			// 1. create HttpClient
+			HttpClient httpclient = new DefaultHttpClient();
+			
+			// 2. make POST request to the given URL
+		    HttpPost httpPost = new HttpPost(url);
+		    
+		    String json = "";
+		    
+
+		    // 3. build jsonObject
+		    JSONObject jsonObject = new JSONObject();
+		    jsonObject.accumulate("name", person.getName());
+		    jsonObject.accumulate("country", person.getCountry());
+		    jsonObject.accumulate("twitter", person.getTwitter());
+		    
+		    // 4. convert JSONObject to JSON to String
+		    json = jsonObject.toString();
+
+		    
+		    // ** Alternative way to convert Person object to JSON string usin Jackson Lib 
+		    // ObjectMapper mapper = new ObjectMapper();
+		    // json = mapper.writeValueAsString(person); 
+		    
+		    // 5. set json to StringEntity
+		    StringEntity se = new StringEntity(json);
+		    
+		    // 6. set httpPost Entity
+		    httpPost.setEntity(se);
+		    
+		    // 7. Set some headers to inform server about the type of the content   
+		    httpPost.setHeader("Accept", "application/json");
+		    httpPost.setHeader("Content-type", "application/json");
+		    
+			// 8. Execute POST request to the given URL
+			HttpResponse httpResponse = httpclient.execute(httpPost);
+			
+			// 9. receive response as inputStream
+			inputStream = httpResponse.getEntity().getContent();
+			
+		    
+			// 10. convert inputstream to string
+			if(inputStream != null)
+				result = convertInputStreamToString(inputStream);
+			else
+				result = "Did not work!";
+		
+		} catch (Exception e) {
+			Log.d("InputStream", e.getLocalizedMessage());
+		}
+		
+		// 11. return result
+		return result;
+	}
+	
+	 @Override
+		public void onClick(View view) {
+		
+			switch(view.getId()){
+				case R.id.btnPost:
+					if(!validate())
+						Toast.makeText(getBaseContext(), "Enter some data!", Toast.LENGTH_LONG).show();
+					// call AsynTask to perform network operation on separate thread
+					new HttpAsyncTask().execute("http://hmkcode.appspot.com/jsonservlet");
+				break;
+			}
+			
+		}
+	
+    public boolean isConnected(){
+    	ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Activity.CONNECTIVITY_SERVICE);
+    	    NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
+    	    if (networkInfo != null && networkInfo.isConnected()) 
+    	    	return true;
+    	    else
+    	    	return false;	
+    }
+   
+    private class HttpAsyncTask extends AsyncTask<String, Void, String> {
+        @Override
+        protected String doInBackground(String... urls) {
+             
+        	person = new Person();
+        	person.setName(etName.getText().toString());
+        	person.setCountry(etCountry.getText().toString());
+        	person.setTwitter(etTwitter.getText().toString());
+
+            return POST(urls[0],person);
+        }
+        // onPostExecute displays the results of the AsyncTask.
+        @Override
+        protected void onPostExecute(String result) {
+        	Toast.makeText(getBaseContext(), "Data Sent!", Toast.LENGTH_LONG).show();
+       }
+    }
+	
+	
+	private boolean validate(){
+		if(etName.getText().toString().trim().equals(""))
+			return false;
+		else if(etCountry.getText().toString().trim().equals(""))
+			return false;
+		else if(etTwitter.getText().toString().trim().equals(""))
+			return false;
+		else
+			return true;	
+	}
+	private static String convertInputStreamToString(InputStream inputStream) throws IOException{
+        BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
+        String line = "";
+        String result = "";
+        while((line = bufferedReader.readLine()) != null)
+            result += line;
+        
+        inputStream.close();
+        return result;
+        
+    }
+
+	
+}

android-post-json/src/com/hmkcode/android/vo/Person.java

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+package com.hmkcode.android.vo;
+
+public class Person {
+
+	private String name;
+	private String country;
+	private String twitter;
+	
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getCountry() {
+		return country;
+	}
+
+	public void setCountry(String country) {
+		this.country = country;
+	}
+
+	public String getTwitter() {
+		return twitter;
+	}
+
+	public void setTwitter(String twitter) {
+		this.twitter = twitter;
+	}
+
+	@Override
+	public String toString() {
+		return "Person [name=" + name + ", country=" + country + ", twitter="
+				+ twitter + "]";
+	}
+	
+	
+}