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안드로이드 android04_화면전환시 값을 전달하는 방법, Activity의 라이프사이클, intent, resume(), intent.putExtra()

2017-09-03 18:46:12 By 머나먼나라 0 1539 댓글수 4 포스트 하기

4월 2024
일	월	화	수	목	금	토
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28	29	30

버튼 button1

텍스트뷰 txtResult

* 이벤트 처리 방법
1. 위젯 변수 선언
2. 위젯 객체 생성 ( R.java 에서 아이디 참조)

findViewById(리소스아이디)

3. 이벤트 처리
뷰.setOn 이벤트 Listener(이벤트 핸들러 구현 );

화면전화
스택처럼 쌓인다.
BmiResultActivity =>back => 스택에서 제거(pop)
BmiActivity
MainActivity

* 액티비티의 라이프 사이클

onCreate() 화면 생성 (스택에 push)
onResume() 화면 다시 그릴 때
onPause() 화면이 멈출 때
onDestroy() 화면을 제거(스택에서 pop)

MainActivity

package com.example.choi.ex01;

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


//Activitiy : 화면 처리 클래스
public class MainActivity extends AppCompatActivity {
//화면을 생성

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

//버튼을 누르면 실행되는 method
 //android:onclick="onClick"
 // View v =new Button(...);
    public void onClick(View v){
//new Intent(현재 클래스 .this, 다음 화면 클래스 .class)

        Intent intent=null;

        switch(v.getId()){

            case R.id.button1:
                intent =new Intent(this, ImgeViewDemo.class);
                break;
            case R.id.button2:
                intent =new Intent(this, Exchange.class);
                break;

            case R.id.button3:
                intent=new Intent(this, BmiActivity.class);
                break;

        }
        startActivity(intent);

    }


    @Override
    protected void onStart() {
        super.onStart();
    }


    @Override
    protected void onResume() {
        super.onResume();
    }


}

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="com.example.choi.ex01.MainActivity">

    <!--onClick ="버튼을 클릭했을 때 실행할 함수 이름-->

    <Button
        android:text="이미지뷰"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button1"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:onClick="onClick" />

    <Button
        android:text="환율계산"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="29dp"
        android:onClick="onClick"
        android:id="@+id/button2" />

    <Button
        android:text="비만도 측정"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="139dp"
        android:id="@+id/button3"
        android:layout_below="@+id/button2"
        android:onClick="onClick"
        android:layout_centerHorizontal="true"


        />


</RelativeLayout>

BmiActivity

package com.example.choi.ex01;

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.EditText;
import android.widget.TextView;

public class BmiActivity extends AppCompatActivity {

    //1.위젯 변수 선언
    EditText editName, editAge, editHeight, editWeight;
    Button button1;
    TextView txtResult;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bmi);
        //2. 위젯 생성 (R.java 에서 아이디 참조)
        editName=(EditText)findViewById(R.id.editName);
        editAge=(EditText)findViewById(R.id.editAge);
        editHeight=(EditText)findViewById(R.id.editHight);
        editWeight=(EditText)findViewById(R.id.editWeight);
        button1=(Button)findViewById(R.id.button1);
        txtResult=(TextView)findViewById(R.id.txtResult);

        //3.이벤트 처리
        //뷰.이벤트리스너(이벤트핸들러)
        button1.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {

            //화면전화
            //new Intent(현재화면.this, 다음화면.class);
                Intent intent=
                        new Intent(BmiActivity.this, BmiResultActivity.class);

                //BMI =몸무게(kg) /(신장*신장)
                double kg =Double.parseDouble(editWeight.getText().toString());
                double height=Double.parseDouble(editHeight.getText().toString());
                double bmi=kg / ((height/100)* (height/100));

                //18.5저체중, 18.5~23정상, 23~25 과체중
                // 25 ~30비만, 30이상 고도비만
               String result ="";
                if(bmi < 18.5){
                        result="저체중";
                }else if (bmi >=18.5 &&  bmi <23){
                    result="정상";
                }else if( bmi >=23 && bmi <25){
                    result="과체중";
                }else if(bmi >=25 && bmi < 30){
                    result ="비만";
                }else if(bmi >=30){
                    result="고도비만";
                }

                //intent.putExtra("변수명", 값)
//                intent.putExtra("name", editName.getText().toString());
//                intent.putExtra("age", editAge.getText().toString());
//                intent.putExtra("bmi",bmi);
//                intent.putExtra("result", result);

                BmiDTO dto =new BmiDTO();
                dto.setAge(Integer.parseInt(editAge.getText().toString()));
                dto.setName(editName.getText().toString());
                dto.setBmi(bmi);
                dto.setResult(result);
                intent.putExtra("dto", dto);


                startActivity(intent);
                //txtResult.setText("bmi 지수  : " +bmi + " : " +result.toString());
            }
        });


    }


    @Override
    protected void onResume() {
        super.onResume();

        editHeight.setText("");
        editWeight.setText("");
        editName.setText("");
        editAge.setText("");

    }
}

bmi

<?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/bmi"
    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="com.example.choi.ex01.BmiActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text=""
        android:hint="이름을 입력하세요"
        android:ems="10"
        android:layout_marginTop="19dp"
        android:id="@+id/editName"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:layout_below="@+id/editName"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="33dp"
        android:id="@+id/editAge"
        android:hint="나이를 입력하세요" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:layout_below="@+id/editAge"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:id="@+id/editHight"
        android:hint="키를 입력하세요" />


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:layout_marginTop="28dp"
        android:id="@+id/editWeight"
        android:hint="체중을 입력하세요"
        android:layout_below="@+id/editHight"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />


    <Button
        android:text="확인"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editWeight"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:id="@+id/button1" />




    <TextView
        android:text="TextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="38dp"
        android:id="@+id/txtResult" />


</RelativeLayout>

BmiResultActivity

package com.example.choi.ex01;

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.TextView;

public class BmiResultActivity extends AppCompatActivity {

    //!위젯 변수 선언
    TextView txtResult;
    Button btnBack;

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

        //2.위젯 연결
        txtResult=(TextView)findViewById(R.id.txtResult);
        btnBack=(Button)findViewById(R.id.btnBack);
        //3. intent.putExtra 로 넘어온 값 조회
        //이전 화면에서 넘어온 인텐트 정보를 가져옴
        Intent intent =getIntent();
        //intent.getExtra("변수명") servelt request.getParameter 유사
        //숫자 자료형인 경우 기본값이 필요함
/*
        String name =intent.getStringExtra("name");
        String age =intent.getStringExtra("age");
        double bmi =intent.getDoubleExtra("bmi", 0);
        String result=intent.getStringExtra("result");

        txtResult.setText("name :" + name +"\n" +
                            "age : "+ age +"\n"+
                            "bmi :" +bmi+"\n"+
                            "result:"+result
                        );
*/
        //객체 직렬화된 바이트배열을 읽어서 dto로 변환
        BmiDTO dto=(BmiDTO)intent.getSerializableExtra("dto");
        String name=dto.getName();
        int age=dto.getAge();
        double bmi=dto.getBmi();
        String result =dto.getResult();
        txtResult.setText("name :" + name +"\n" +
                "age : "+ age +"\n"+
                "bmi :" +bmi+"\n"+
                "result:"+result
        );
        //4.버튼 클릭 이벤트;
        btnBack.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                finish();//현재 화면을 종료
            }
        });

    }




}

bmi_result

<?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/bmi_result"
    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="com.example.choi.ex01.BmiResultActivity">

    <Button
        android:text="뒤로가기"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/btnBack" />

    <TextView
        android:text="TextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btnBack"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="75dp"
        android:id="@+id/txtResult" />
</RelativeLayout>


BmiDTO

package com.example.choi.ex01;

import java.io.Serializable;

/**
 * Created by choi on 2017-02-08.
 */
//intent 를 이용해서 객체를 넘길 경우 Seriablizable 을 구현해야 함
//객체 직렬화: 객체에 포함된 변수들의 자료형을 무시하고 바이트배열로
public class BmiDTO implements Serializable {

    private String name;
    private int age;
    private double bmi;
    private String result;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public double getBmi() {
        return bmi;
    }

    public void setBmi(double bmi) {
        this.bmi = bmi;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }

    @Override
    public String toString() {
        return "BmiDTO{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", bmi=" + bmi +
                ", result='" + result + '\'' +
                '}';
    }
}