Get phone number from Contacts database

In the exercise, start a activity with intent of Intent.ACTION_PICK. Retrieve the phone number from the selected contact using SQLite query.

package com.example.androidreadcontact;

import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;

public class MainActivity extends Activity {
 
 Button buttonReadContact;
 TextView textPhone;
 
 final int RQS_PICKCONTACT = 1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  buttonReadContact = (Button)findViewById(R.id.readcontact);
  textPhone = (TextView)findViewById(R.id.phone);
  
  buttonReadContact.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    //Start activity to get contact
    final Uri uriContact = ContactsContract.Contacts.CONTENT_URI;
    Intent intentPickContact = new Intent(Intent.ACTION_PICK, uriContact);
    startActivityForResult(intentPickContact, RQS_PICKCONTACT);
   }});

 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  if(resultCode == RESULT_OK){
   if(requestCode == RQS_PICKCONTACT){
    Uri returnUri = data.getData();
    Cursor cursor = getContentResolver().query(returnUri, null, null, null, null);
    
    if(cursor.moveToNext()){
     int columnIndex_ID = cursor.getColumnIndex(ContactsContract.Contacts._ID);
     String contactID = cursor.getString(columnIndex_ID);
     
     int columnIndex_HASPHONENUMBER = cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER);
     String stringHasPhoneNumber = cursor.getString(columnIndex_HASPHONENUMBER);
     
     if(stringHasPhoneNumber.equalsIgnoreCase("1")){
      Cursor cursorNum = getContentResolver().query(
        ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
        null, 
        ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactID, 
        null, 
        null);
      
      //Get the first phone number
      if(cursorNum.moveToNext()){
       int columnIndex_number = cursorNum.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
       String stringNumber = cursorNum.getString(columnIndex_number);
       textPhone.setText(stringNumber);
      }
      
     }else{
      textPhone.setText("NO Phone Number");
     }
     
     
    }else{
     Toast.makeText(getApplicationContext(), "NO data!", Toast.LENGTH_LONG).show();
    }
   }
  }
 }
 
 

}

Layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/readcontact"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
        android:text="Read Contact"/>
    <TextView
        android:id="@+id/phone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Permission of "android.permission.READ_CONTACTS" is needed in AndroidManifest.xml.

Download the files.