android-post-json

android-post-json

android-post-json/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.hmkcode.android"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="8"
+        android:targetSdkVersion="17" />
+
+     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name="com.hmkcode.android.MainActivity"
+            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>
+
+</manifest>

android-post-json/res/layout/activity_main.xml

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+<?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="match_parent"
+    android:orientation="vertical" >
+    
+    <TextView
+        android:id="@+id/tvIsConnected"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"     
+        android:background="#FF0000"
+        android:textColor="#FFF"
+        android:textSize="18dp"
+        android:layout_marginBottom="5dp"
+        android:text="is connected?" />
+    
+   <RelativeLayout
+        android:layout_width="wrap_content"
+    	android:layout_height="wrap_content">
+       
+       <TextView 
+            android:id="@+id/tvName"
+       		android:layout_width="50dp"
+        	android:layout_height="wrap_content"
+        	android:text="Name"
+        	android:layout_alignBaseline="@+id/etName"/>
+       <EditText 
+            android:id="@+id/etName"
+       		android:layout_width="150dp"
+        	android:layout_height="wrap_content"
+        	android:layout_toRightOf="@+id/tvName"/>
+       <TextView 
+            android:id="@+id/tvCountry"
+       		android:layout_width="50dp"
+        	android:layout_height="wrap_content"
+        	android:layout_below="@+id/tvName"
+        	android:text="Country"
+        	android:layout_alignBaseline="@+id/etCountry"/>
+       <EditText 
+            android:id="@+id/etCountry"
+       		android:layout_width="150dp"
+        	android:layout_height="wrap_content"
+        	android:layout_toRightOf="@+id/tvCountry"
+        	android:layout_below="@+id/etName"/>
+       <TextView 
+            android:id="@+id/tvTwitter"
+       		android:layout_width="50dp"
+        	android:layout_height="wrap_content"
+        	android:layout_below="@+id/tvCountry"
+        	android:text="Twitter"
+        	android:layout_alignBaseline="@+id/etTwitter"/>
+       <EditText 
+            android:id="@+id/etTwitter"
+       		android:layout_width="150dp"
+        	android:layout_height="wrap_content"
+        	android:layout_toRightOf="@+id/tvTwitter"
+        	android:layout_below="@+id/etCountry"/>
+   </RelativeLayout>
+   
+   <Button 
+       android:id="@+id/btnPost"
+       android:layout_width="200dp"
+       android:layout_height="wrap_content"
+       android:layout_gravity="center_horizontal"
+       android:text="POST"/>
+   
+
+
+</LinearLayout>

android-post-json/res/menu/main.xml

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+<menu xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:showAsAction="never"
+        android:title="@string/action_settings"/>
+
+</menu>

android-post-json/res/values/dimens.xml

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+<resources>
+
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+
+</resources>

android-post-json/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="app_name">POST JSON</string>
+    <string name="action_settings">Settings</string>
+    <string name="hello_world">Hello world!</string>
+
+</resources>

android-post-json/res/values/styles.xml

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+<resources>
+
+    <!--
+        Base application theme, dependent on API level. This theme is replaced
+        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
+    -->
+    <style name="AppBaseTheme" parent="android:Theme.Light">
+        <!--
+            Theme customizations available in newer API levels can go in
+            res/values-vXX/styles.xml, while customizations related to
+            backward-compatibility can go here.
+        -->
+    </style>
+
+    <!-- Application theme. -->
+    <style name="AppTheme" parent="AppBaseTheme">
+        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
+    </style>
+
+</resources>

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 + "]";
+	}
+	
+	
+}