그림으로 쉽게 설명하는 안드로이드 프로그래밍(개정6판) 연습문제 9장

정답이 아닐 수 있습니다. 오류가 있으면 알려주세요ㅎ

 

1. 2번 액티비티

 

2. 3번 액티비티 스택

 

3. 3번 인텐트

 

4. 2번 명시적 인텐트

 

5. 2번 startActivity()

 

6. 2번 startActivityForResult()

 

7. 2번 ACTION_VIEW

 

8. 1번 onCreate()

 

9. 4번 onPause()

 

10.

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="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:backgroundTint="#CCCCCC"
        android:text="서브 액티비티로부터 문자열 반환받기"
        android:textColor="@color/black" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="반환된 문자열" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="___________________" />

</LinearLayout>

 

subactivity.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/edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/black" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/insert"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:backgroundTint="#CCCCCC"
            android:text="입력완료"
            android:textColor="@color/black" />

        <Button
            android:id="@+id/cancel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:backgroundTint="#CCCCCC"
            android:text="취소"
            android:textColor="@color/black" />
    </LinearLayout>

</LinearLayout>

 

MainActivity.java

package kr.co.company.ch9_exercises;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    static final int GET_RESULT = 1;
    TextView text;
    Button btn;

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

        btn = findViewById(R.id.btn);
        text = findViewById(R.id.text);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, SubActivity.class);
                startActivityForResult(intent, GET_RESULT);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == GET_RESULT) {
            if (resultCode == RESULT_OK) {
                text.setText("" + data.getStringExtra("RESULT"));
            }
        }
    }
}

 

SubActivity.java

package kr.co.company.ch9_exercises;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import androidx.appcompat.app.AppCompatActivity;

public class SubActivity extends AppCompatActivity {
    EditText edit;
    Button insert, cancel;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.subactivity);
        edit = findViewById(R.id.edit);
        insert = findViewById(R.id.insert);
        cancel = findViewById(R.id.cancel);

        insert.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.putExtra("RESULT", edit.getText().toString());
                setResult(RESULT_OK, intent);
                finish();
            }
        });

        cancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setResult(RESULT_CANCELED);
                finish();
            }
        });
    }
}

 

결과