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App/Android Studio

Android Studio - 복습

by 코젼 2022. 8. 9.

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2022-08-09(37일차)

📃EditText에 입력한 값이 첫 번째 액티비티 화면의 TextView에 출력되게 하시오.

📂파일

MainActivity2.java

MainActivity.java

📝layout1.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"
    android:padding="20dp">

    <TextView
        android:id="@+id/tv_info"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="버튼을 누르면 입력 액티비티를 실행합니다."
        android:textSize="20sp" />

    <Button
        android:id="@+id/btn_play"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="입력창 실행"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/tv_output"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="30sp" />

</LinearLayout>

📝layout2.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"
    android:padding="20dp">

    <EditText
        android:id="@+id/et_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="140dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_change"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="입력"
            android:textSize="20sp" />

        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="취소"
            android:textSize="20sp" />
    </LinearLayout>

</LinearLayout>

📝MainActivity.java

package com.example.review01;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout1);

        findViewById(R.id.btn_play).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, MainActivity2.class);
                startActivityForResult(intent, 1);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        ((TextView)findViewById(R.id.tv_output)).setText(data.getStringExtra("input"));
    }
}

📝MainActivity2.java

package com.example.review01;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity2 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout2);

        findViewById(R.id.btn_change).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String str = ((EditText)findViewById(R.id.et_input)).getText().toString();
                Intent intent = getIntent();
                intent.putExtra("input", str+"");
                setResult(RESULT_OK, intent);

                finish();
            }
        });

        findViewById(R.id.btn_cancel).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}

📃리스트뷰의 아이템을 클릭하면 text를 수정할 수 있고, ADD버튼을 누르면 아이템을 추가할 수 있도록 코드를 작성하시오.

📂파일

MainActivity.java

MainActivity2.java

📝layout1.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"
    android:padding="20dp">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn_add"
        android:text="add"
        android:textSize="30sp"/>

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lv"/>

</LinearLayout>

📝layout2.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"
    android:padding="20dp">

    <EditText
        android:id="@+id/et_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp" />

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

        <Button
            android:id="@+id/btn_ok"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="확인"
            android:textSize="20sp" />

        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="취소"
            android:textSize="20sp" />

    </LinearLayout>

</LinearLayout>

📝MainActivity.java

package com.example.review02;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ArrayList<String> al = new ArrayList<>();
    ArrayAdapter aa;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout1);
        al.add("한국");
        al.add("중국");
        al.add("일본");

        aa = new ArrayAdapter(this, android.R.layout.simple_list_item_1, al);
        ListView lv = findViewById(R.id.lv);
        lv.setOnItemClickListener(lis);
        lv.setAdapter(aa);

        findViewById(R.id.btn_add).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, MainActivity2.class);
                startActivityForResult(intent, 2);
            }
        });

    }

    AdapterView.OnItemClickListener lis = new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Intent intent = new Intent(MainActivity.this, MainActivity2.class);
            intent.putExtra("country", al.get(position));
            intent.putExtra("index", position);
            startActivityForResult(intent, 1);
        }
    };

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        int index = data.getIntExtra("index", -1);
        String str = data.getStringExtra("text");
        if(resultCode == RESULT_OK) {
            if(requestCode == 1) {
                al.set(index, str);
                aa.notifyDataSetChanged();
            }
            else if(requestCode == 2) {
                al.add(str);
                aa.notifyDataSetChanged();
            }
        }

    }
}

📝MainActivity2.java

package com.example.review02;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity2 extends AppCompatActivity {
    Intent i;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout2);

        EditText et_input = findViewById(R.id.et_input);
        et_input.setText(getIntent().getStringExtra("country"));

        findViewById(R.id.btn_ok).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                i = getIntent();
                i.putExtra("text", et_input.getText().toString()+"");
                setResult(RESULT_OK, i);
                finish();
            }
        });

        findViewById(R.id.btn_cancel).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}

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