BEGIN...

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class IntentAppActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        Button mapButton = (Button) this.findViewById(R.id.mapButton);              // 지도버튼 생성.
        Button phoneButton = (Button) this.findViewById(R.id.phoneButton);         // 폰버튼 생성. 
       
        mapButton.setOnClickListener( new View.OnClickListener() {
   
           @Override
           public void onClick(View v) {
    
               Uri uri = Uri.parse("geo:37.4944732,127.05413818333334");                  // 좌표값 설정.
               Intent intent = new Intent( android.content.Intent.ACTION_VIEW, uri); // 인텐트 생성.  
    
               startActivity(intent);                                                                     // 액티비티 실행.
           }
    });

    phoneButton.setOnClickListener( new View.OnClickListener() {
   
        @Override
         public void onClick(View v) {
    
             Uri uri = Uri.parse("tel:555-1234");         // 전화번호 설정.
             Intent intent = new Intent( android.content.Intent.ACTION_DIAL, uri); // 인텐트 생성.  
    
             startActivity(intent);             // 액티비티 실행.
         }
      });
    }
}

아래는 실행 화면이다.