Android 액티비티 데이터 전달 예제

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity6"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnDataInput"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="데이터입력"
        android:textSize="30dp"/>
    <Button
        android:id="@+id/btnDataOut"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="데이터 출력"
        android:textSize="30dp"/>
    <Button
        android:id="@+id/btnDataStu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="학생 정보 입력"
        android:textSize="30dp"/>

</LinearLayout>

 

input.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity6_input"
    android:layout_gravity="center"
    android:orientation="vertical">

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="40dp">

        <TableRow android:layout_margin="5dp">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="이름"/>

            <EditText
                android:id="@+id/editName"
                android:layout_height="wrap_content"
                android:layout_width="200dp"
                android:hint="이름"/>
        </TableRow>

        <TableRow android:layout_margin="5dp">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="나이"/>

            <EditText
                android:id="@+id/editAge"
                android:layout_height="wrap_content"
                android:layout_width="200dp"
                android:hint="나이"/>
        </TableRow>

        <TableRow android:layout_margin="5dp">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="전화번호"/>

            <EditText
                android:id="@+id/editPhone"
                android:layout_height="wrap_content"
                android:layout_width="200dp"
                android:hint="전화번호"/>
        </TableRow>
    </TableLayout>

    <Button
        android:id="@+id/btnInputCom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="입력완료"
        android:textSize="15sp"/>

</LinearLayout>

 

output.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity6_output"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tvDisplay"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="입력 결과 : "
        android:textSize="25sp"/>
    <TextView
        android:id="@+id/tvDisplay2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="학생 입력 결과 : "
        android:textSize="25sp"/>
    <Button
        android:id="@+id/btnMainBack"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="돌아가기"
        android:textSize="15sp"
        android:layout_margin="10dp"/>

</LinearLayout>

stuput.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity6_Stu"
    android:orientation="vertical"
    android:gravity="center">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="학번"
            android:textSize="25sp"/>

        <EditText
            android:id="@+id/editSnum"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="학번"
            android:layout_weight="1"
            android:textSize="25sp"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="이름"
            android:textSize="25sp"/>

        <EditText
            android:id="@+id/editName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="이름"
            android:layout_weight="1"
            android:textSize="25sp"/>

    </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="전공"
            android:textSize="25sp"/>

        <EditText
            android:id="@+id/editMajor"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="전공"
            android:layout_weight="1"
            android:textSize="25sp"/>

    </LinearLayout>

    <Button
        android:id="@+id/btnStuHome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="학생입력완료"
        android:textSize="30sp"/>

</LinearLayout>

---

Student.java (class)

public class Student  implements Serializable {
    private  int sno;
    private String name;
    private  String major;


    public Student(){

    }

    public Student(int sno, String name, String major) {
        this.sno = sno;
        this.name = name;
        this.major = major;
    }


    public int getSno() {
        return sno;
    }

    public void setSno(int sno) {
        this.sno = sno;
    }

    public String getName() {
        return name;
    }

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

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }
}

---

main.activity

public class MainActivity6 extends AppCompatActivity {
    private  String name, age, phone;
    private  Student student;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main6);

        Button btnDataInput = findViewById(R.id.btnDataInput);
        Button btnDataOut = findViewById(R.id.btnDataOut);
        Button btnDataStu = findViewById(R.id.btnDataStu);



        //입력
        btnDataInput.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent = new Intent(getApplicationContext(), MainActivity6_input.class);
//                startActivity(intent);
                startActivityForResult(intent,0);

            }
        });

        //출력
        btnDataOut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getApplicationContext(), MainActivity6_output.class);
                intent.putExtra("name",name);
                intent.putExtra("age",age);
                intent.putExtra("phone",phone);

                intent.putExtra("student",student);

                startActivity(intent);
            }
        });

        //학생 정보 입력
        btnDataStu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            Intent intent = new Intent(getApplicationContext(), MainActivity6_Stu.class);
            startActivityForResult(intent,0);
            }
        });
    }

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

        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode  == RESULT_OK){
            name = data.getStringExtra("name");
            age = data.getStringExtra("age");
            phone = data.getStringExtra("phone");
            return;

        }
        if(resultCode  == 10){
            student = (Student) data.getSerializableExtra("student");
            return;
        }

    }
}

 

input.activity

public class MainActivity6_input extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity6_input);

        EditText editName = findViewById(R.id.editName);
        EditText editAge = findViewById(R.id.editAge);
        EditText editPhone = findViewById(R.id.editPhone);
        Button btnInputCom = findViewById(R.id.btnInputCom);

        btnInputCom.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getApplicationContext(),MainActivity6.class);
                intent.putExtra("name", editName.getText().toString());
                intent.putExtra("age", editAge.getText().toString());
                intent.putExtra("phone", editPhone.getText().toString());
                setResult(RESULT_OK,intent);
                finish();
            }
        });
    }
}

 

output.activity

public class MainActivity6_output extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity6_output);
        setTitle("output 액티비티");

        Button btnMainBack = findViewById(R.id.btnMainBack);
        TextView tvDisplay = findViewById(R.id.tvDisplay);
        TextView tvDisplay2 = findViewById(R.id.tvDisplay2);

        // intent 로  부터 받아오기
        Intent intent = getIntent();
        String name = intent.getStringExtra("name");
        String age = intent.getStringExtra("age");
        String phone = intent.getStringExtra("phone");

        tvDisplay.setText("데이터 : "+name+" // "+ age + " // " + phone+"");
        //// Student 객체로 받기
        Student student = (Student) intent.getSerializableExtra("student");
        if(student != null) {
            tvDisplay2.setText("학생 객체 : " + student.getSno() + " : " + student.getName() + " : " + student.getMajor());
        }
        btnMainBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent1 = new Intent(getApplicationContext(), MainActivity6.class);
                finish();
            }
        });


    }
}

 

stu.activity

public class MainActivity6_Stu extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity6_stu);

        EditText editSnum = findViewById(R.id.editSnum);
        EditText editName = findViewById(R.id.editName);
        EditText editMajor = findViewById(R.id.editMajor);
        Button btnStuHome = findViewById(R.id.btnStuHome);

        btnStuHome.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Student student = new Student();
                student.setSno(Integer.parseInt(editSnum.getText().toString()));
                student.setName(editName.getText().toString());
                student.setMajor(editMajor.getText().toString());

                Intent intent = new Intent();
                intent.putExtra("student",student);
                setResult(10,intent);


                finish();
            }
        });

    }

}

 

---

결과 값