안드로이드 - intent

Java1-(main)

package com.example.ryan.intent;

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 MainActivity extends AppCompatActivity {

    static final int GET_STRING=1;
    TextView text1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button)findViewById(R.id.button);
        text1 = (TextView)findViewById(R.id.text1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent in = new Intent(MainActivity.this, sub.class);
                startActivityForResult(in,GET_STRING);
            }
        });
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        if(requestCode==GET_STRING){
            if(resultCode==RESULT_OK){
                text1.setText(data.getStringExtra("INPUT_TEXT"));
            }
        }
    }

}

Java2

package com.example.ryan.intent;

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

public class sub extends MainActivity {
EditText edit;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sub);
        edit = (EditText)findViewById(R.id.edit);

        Button button_ok = (Button)findViewById(R.id.button_ok);
        button_ok.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                Intent intent = new Intent();
                intent.putExtra("INPUT_TEXT",edit.getText().toString());
                setResult(RESULT_OK,intent);
                finish();
            }
        });

        Button button_cancel=(Button) findViewById(R.id.button_cancel);
        button_cancel.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                setResult(RESULT_CANCELED);
                finish();
            }
        });



    }
}

xml1-(main)

<?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"
    android:orientation="vertical"
    tools:context="com.example.ryan.intent.MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="서브 액티비티로부터 문자열 반환받기"
        />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:text="반환된 문자열" />

    <TextView
        android:id="@+id/text1"
        android:layout_width="133dp"
        android:layout_height="58dp"
        android:hint="입력"
        android:text="입력:ㅇㅇㄴㄹㅁㅇㄹ" />
</LinearLayout>

xml2

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/linearLayout1"
    android:layout_width="match_parent"

    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:orientation="vertical">


    <EditText
        android:id="@+id/edit"
        android:layout_width="match_parent"
        android:layout_height="93dp"
        android:layout_weight="1"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Name" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_ok"
            android:layout_width="136dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="입력" />

        <Button
            android:id="@+id/button_cancel"
            android:layout_width="141dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="취소" />
    </LinearLayout>
</LinearLayout>

manifest

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

    <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=".sub" android:label="sub"></activity>
    </application>

</manifest>