android - Activity, Intent 응용 (액티비티 화면 세개 전환)

파일명 : activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnNewActivity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="새 화면 열기"/>

    <Button
        android:id="@+id/btnFisish1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="닫기"
        android:onClick="close1" />
</LinearLayout>

파일명 : second.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#00FF00"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnReturn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="새 화면 열기"
        android:onClick="onBtn" />
    <Button
        android:id="@+id/btnFisish2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="닫기"
        android:onClick="close1" />

</LinearLayout>

파일명 : third.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:orientation="vertical"
    tools:context=".ThirdActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <RadioGroup
            android:id="@+id/radioGroup1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <RadioButton
                android:id="@+id/rButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Second 액티비티" />
            <RadioButton
                android:id="@+id/rButton2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="메인 액티비티" />
        </RadioGroup>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
        <Button
            android:id="@+id/btn1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="새화면열기"/>
        <Button
            android:id="@+id/btnFisish3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="닫기"
            android:onClick="close1" />
    </LinearLayout>
</LinearLayout>

파일명 : MainActivity.java

package com.example.it.myapplication8_2;

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("메인 액티비티");

        Button btnNewActivity = (Button) findViewById(R.id.btnNewActivity);
        btnNewActivity.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(intent);
            }
        });
    }

    void close1 (View view) {
        finish();
    }
}

파일명 : SecondActivity.java

package com.example.it.myapplication8_2;

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

class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        setTitle("두번째");
    }

    void onBtn (View view) {
        Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
        startActivity(intent);
    }

    void close1 (View view) {
        finish();
    }

}

파일명 : ThirdActivity.java

package com.example.it.myapplication8_2;

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

public class ThirdActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.third);
        setTitle("세번째");

        Button btn1 = (Button) findViewById(R.id.btn1);

        btn1.setOnClickListener(new View.OnClickListener() {
                                    @Override
                                    public void onClick(View v) {
                                        RadioGroup rg = (RadioGroup) findViewById(R.id.radioGroup1);
                                        RadioButton selectedRdo = (RadioButton) findViewById(rg.getCheckedRadioButtonId());
                                        // String selectedValue = selectedRdo.getText().toString(); // 라디오 버튼 값

                                        Intent intent;
                                        String str = "";

                                        switch (rg.getCheckedRadioButtonId()) {
                                            case R.id.rButton1 :
                                                intent = new Intent(ThirdActivity.this, SecondActivity.class);
                                                startActivity(intent);
                                                str = "a";
                                                break;
                                            case R.id.rButton2 :
                                                intent = new Intent(ThirdActivity.this, MainActivity.class);
                                                startActivity(intent);
                                                str = "b";
                                                break;
                                        }

                                    }
                                }
        );
    }

    void close1 (View view) {
        finish();
    }

}

파일명 : AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.it.myapplication8_2">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity"></activity>
        <activity android:name=".ThirdActivity"></activity>
    </application>

</manifest>