Android Intent between 2 Activity

2개의 Activity 사이에 Intent를 이용하여 데이터를 주고 받는 예

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".TestActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Activity02"
            android:label="두번째 액티비티" >
        </activity>
    </application>

</manifest>

Activity01.java

package com.example.androidapp;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class Activity01 extends Activity {
	
	ImageView iv;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.intentdemo01); 
		iv = (ImageView) findViewById(R.id.imageView1);
	}
	
	public void onBtnNext(View v) {
		Intent intent = new Intent(this, Activity02.class);
		intent.putExtra("msg", "그림을 골라주세요");
		startActivityForResult(intent, 111);
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if(requestCode==111 && resultCode==1) {
			int imgNum = Integer.valueOf(data.getExtras().getString("imgNum"));
			int id = 0;
			switch(imgNum) {
			case 1:
				id = R.drawable.mountain; break;
			case 2:
				id = R.drawable.persian_smile; break;
			case 3:
				id = R.drawable.sky; break;
			}
			iv.setImageResource(id);
		}
	}
}

intentdemo01.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" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onBtnNext"
        android:text="두번째 액티비티로 이동" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

Activity02.java

package com.example.androidapp;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;

public class Activity02 extends Activity {
	
	EditText et;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.intentdemo02);
		et = (EditText) findViewById(R.id.editText1);
		Intent intent = getIntent();
		String msg = intent.getExtras().getString("msg");
		Log.e("첫번째 액티비티로부터 전달된 데이터", msg);
	}
	
	public void onBtnReturn(View v) {
		Intent intent = new Intent();
		intent.putExtra("imgNum", et.getText().toString());
		setResult(1, intent);
		finish();
	}
}

intentdemo02.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" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >

        <requestFocus />
    </EditText>



    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onBtnReturn"
        android:text="앞의 액티비티에 데이터 전달하기" />

</LinearLayout>