class MainActivity

package org.androidtown.myactivity;

import android.content.ComponentName;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final int ACTIVITY_MENU =1001;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    public void onButton1Clicked(View v){
        // 1. 첫번째 방법
        //화면띄우기 안드로이드 에서는 Intent
 /*       Intent intent =new Intent(getApplicationContext(), MenuActivity.class);
        intent.putExtra("title", "소녀시대");
        //반환 값을 받고 싶을때
        startActivityForResult(intent, ACTIVITY_MENU);

*/
        //2. 두번째 방법
        Intent intent =new Intent();
        //ComponentName(패키기지이름, 패키지이름 + 클래스명)
        ComponentName name =new ComponentName("org.androidtown.myactivity",
                                "org.androidtown.myactivity.MenuActivity");
        intent.setComponent(name);
        intent.putExtra("title", "소녀시대");
        startActivityForResult(intent, ACTIVITY_MENU);
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if(data!=null){
            String name =data.getStringExtra("name");
            Toast.makeText(getApplicationContext(),  "전달받은 값 " +name, Toast.LENGTH_LONG).show();
        }

        super.onActivityResult(requestCode, resultCode, data);
    }



    public void onButton2Clicked(View v){

        Intent intent =new Intent(Intent.ACTION_DIAL, Uri.parse("tel:010-1000-1000 "));
        startActivity(intent);
    }


}

 

 

R.layout.activity_main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="org.androidtown.myactivity.MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="메이화면"
        android:textSize="30dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:textAlignment="center" />

    <Button
        android:text="새화면 띄우기"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:layout_marginTop="58dp"

        android:layout_centerHorizontal="true"
        android:onClick="onButton1Clicked"
        />

    <Button
        android:text="전화걸기"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="37dp"
        android:id="@+id/button2"
        android:onClick="onButton2Clicked" />


</RelativeLayout>

 

 

class MenuActivity

package org.androidtown.myactivity;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;

public class MenuActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);

        Intent intent=getIntent();
        if(intent!=null){
            String title =intent.getStringExtra("title");
            Toast.makeText(getApplicationContext(), "전달 받은값 : " + title, Toast.LENGTH_SHORT).show();
        }
    }

    public void onButton1Clicked(View v) {

       Intent intent=new Intent();
       intent.putExtra("name", "티아라");
       setResult(RESULT_OK, intent);

        //현재 화면을 지운다.
        finish();
    }



}

 

R.layout.activity_menu

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_menu"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="org.androidtown.myactivity.MenuActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="메뉴화면"
        android:textSize="30dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:textAlignment="center"
        android:textColor="@color/colorAccent" />

    <Button
        android:text="돌아가기"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:layout_marginTop="58dp"

        android:layout_centerHorizontal="true"
        android:onClick="onButton1Clicked"
        />


</RelativeLayout>

 

AndroidMainfest.xml

 

    <uses-permission android:name="android.permission.CALL_PHONE" />

 

 

 

 

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