Send Message To Selected Contacts

This application first displays person name and mobile number from contacts of the device. User can enter message text and select contacts to whom the message is to be sent.

This application uses the following features of Android.

It uses SmsManager class to send messages
It uses Contacts API to get all mobile numbers for all contacts in the device
Custom Adapter for ListView
ProgressDialog to notify user
Multithreading with Handler to send messages in worker thread

Steps

Here are the steps and code related to this application.

First create a new Android project that supports API 8 or above. I named it as SendMessage

Create the following classes:

Contact.java


package com.st.messages;

public class Contact {
	private String name;
	private String mobile;

	public Contact(String name, String mobile) {
		super();
		this.name = name;
		this.mobile = mobile;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getMobile() {
		return mobile;
	}

	public void setMobile(String mobile) {
		this.mobile = mobile;
	}

}

ContactsAdapter.java

package com.st.messages;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class ContactsAdapter extends BaseAdapter {
		private Context context;
		private ArrayList<Contact> contacts;
	 
		public ContactsAdapter(Context context, ArrayList<Contact> contacts) {
			this.context = context;
			this.contacts = contacts;
		}
	 
		public View getView(int position, View convertView, ViewGroup parent) {
	 
			LayoutInflater inflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	 
			View gridView;
	 
			if (convertView == null) {
	 
				gridView = new View(context);
	 
				// get layout from contact.xml
				gridView = inflater.inflate(R.layout.contact, null);
	 
				TextView textName = (TextView) gridView.findViewById(R.id.name);
				textName.setText( contacts.get(position).getName());
				
				TextView textMobile = (TextView) gridView.findViewById(R.id.mobile);
				textMobile.setText( contacts.get(position).getMobile());
	 
			} else {
				gridView = (View) convertView;
			}
	 
			return gridView;
		}
	 
		@Override
		public int getCount() {
			return contacts.size();
		}
	 
		@Override
		public Object getItem(int position) {
			return null;
		}
	 
		@Override
		public long getItemId(int position) {
			return 0;
		}
}

SendMessagesActivity.java

package com.st.messages;
import java.util.ArrayList;
import android.app.Activity;
import android.app.ProgressDialog;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Data;
import android.telephony.SmsManager;
import android.util.Log;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class SendMessagesActivity extends Activity {
	ListView listView;
	EditText editMessage;
	ProgressDialog progressDialog;
	Handler progresshandler;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.listcontacts);
		listView = (ListView) findViewById(R.id.contactsView);
		editMessage = (EditText) findViewById(R.id.editMessage);

		Cursor c = this.managedQuery(ContactsContract.Data.CONTENT_URI, null,
			Data.MIMETYPE + "=?", // condition
	        new String[] { ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE }, // value
			null);

		ArrayList<Contact> contacts = new ArrayList<Contact>();

		while (c.moveToNext()) {
			int type = c.getInt(c.getColumnIndex(Phone.TYPE));
			if (type == Phone.TYPE_MOBILE) {
				Contact con = new Contact(c.getString(c
						.getColumnIndex(Contacts.DISPLAY_NAME)), c.getString(c
						.getColumnIndex(Phone.NUMBER)));
				contacts.add(con);
			}
		}
		listView.setAdapter(new ContactsAdapter(this, contacts));

		progressDialog = new ProgressDialog(this);
		progressDialog.setMessage("Sending Messages.. Please wait!");

		progresshandler = new Handler() {
			public void handleMessage(Message msg) {
				progressDialog.dismiss();
				Toast.makeText(SendMessagesActivity.this, "Messages Sent",
						Toast.LENGTH_LONG).show();
			}
		};
	}

	class SendMessagesThread extends Thread {
		Handler handler;

		public SendMessagesThread(Handler handler) {
			this.handler = handler;
		}

		public void run() {
			SmsManager smsManager = SmsManager.getDefault();
			// Find out which contacts are selected
			for (int i = 0; i < listView.getCount(); i++) {
				View item = (View) listView.getChildAt(i);
				boolean selected = ((CheckBox) item.findViewById(R.id.selected)).isChecked();
				if (selected) {
					String mobile = ((TextView) item.findViewById(R.id.mobile)).getText().toString();
					try {
						smsManager.sendTextMessage(mobile, null, editMessage.getText().toString(), null, null);
					} catch (Exception ex) {
						Log.d("Mobile", "Could not send message to " + mobile);
					}
				}
			}
			Message m = handler.obtainMessage();
			handler.sendMessage(m);
		} // run
	} // Thread

	public void sendMessages(View v) {
		if (editMessage.getText().toString().length() > 0) {
			SendMessagesThread thread = new SendMessagesThread(progresshandler);
			thread.start();
			progressDialog.show();
		} else {
			Toast.makeText(this, "Please enter message!", Toast.LENGTH_LONG)
					.show();
		}
	}
}

res/layout/contact.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:stretchColumns="1">
    
    <TableRow>
      <CheckBox android:id="@+id/selected" 
           android:layout_width="wrap_content"
           android:layout_height="wrap_content" />  
      <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </TextView>    
    
    <TextView
        android:id="@+id/mobile"
        android:layout_width="100dp"
        android:layout_height="wrap_content" >
    </TextView>
    
    </TableRow>
 
</TableLayout>

res/layout/listcontacts.xml

<?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/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enter Message Text:" />
    

    <EditText
        android:id="@+id/editMessage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:singleLine="false" />

    <Button android:id="@+id/btnSend"
        android:onClick="sendMessages"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Send Message" />
    <ListView
        android:id="@+id/contactsView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </ListView>
</LinearLayout>

Maninfest file is as follows : AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.st.messages"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission android:name="android.permission.SEND_SMS" />
    
    <application
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name=".SendMessagesActivity"
            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>

res/values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Send Message</string>
</resources>

Place icon.jpg in res/drawable folder
Build and run the project using Emulator that supports API 8 or highter
Enter text to be sent and select contacts to whom you want to send message. Click on Send Message button to send message to selected mobile numbers.

Related Resources

Use the following links to download .APK file of this application.

Download SendMessage.apk and install in your device.