android - AlertDialog, setPositiveButton, setNegativeButton, Toast

1. AlertDialog에서 입력한 값을 MainActivity에 표출하기, AlertDIalog에서 취소버튼 클릭시 MainActivity에 Toast 띄우기

파일명 : 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:gravity="center_horizontal"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="사용자 이름"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/tvEmail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="이메일"
        android:textSize="20dp" />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="여기를 클릭" />

</LinearLayout>

파일명 : dialog1.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" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="사용자 이름"
        android:textSize="20dp" />

    <EditText
        android:id="@+id/dlgEdt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="이메일"
        android:textSize="20dp" />
    <EditText
        android:id="@+id/dlgEdt2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

파일명 : toast1.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:background="#ff0000"
    android:gravity="center"
    android:orientation="horizontal" >

    <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher_background" />
    <TextView
        android:id="@+id/toastText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:textSize="20dp" />
    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher_background"/>
</LinearLayout>

파일명 : MainActivity.java

package com.example.it.myapplication7_8;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    TextView tvName, tvEmail;
    Button button1;
    EditText dlgEdtName, dlgEdtEmail;
    TextView toastText;
    View dialogView, toastView;

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

        tvName = (TextView) findViewById(R.id.tvName);
        tvEmail = (TextView) findViewById(R.id.tvEmail);
        button1 = (Button) findViewById(R.id.button1);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dialogView = (View) View.inflate(MainActivity.this, R.layout.dialog1, null);

                AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                dlg.setTitle("사용자 정보 입력");
                dlg.setIcon(R.drawable.ic_launcher_background);
                dlg.setView(dialogView);
                dlg.setPositiveButton("확인", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dlgEdtName = (EditText) dialogView.findViewById(R.id.dlgEdt1);
                        dlgEdtEmail = (EditText) dialogView.findViewById(R.id.dlgEdt2);

                        tvName.setText(dlgEdtName.getText().toString());
                        tvEmail.setText(dlgEdtEmail.getText().toString());

                    }
                });

                dlg.setNegativeButton("취소", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast toast = new Toast(MainActivity.this);

                        toastView = (View) View.inflate(MainActivity.this, R.layout.toast1, null);
                        toastText = (TextView) toastView.findViewById(R.id.toastText1);
                        toastText.setText("취소했습니다.");
                        toast.setView(toastView);
                        toast.show();
                    }
                });
                dlg.show();
            }
        });
    }
}

2. MainActivity에서 입력한 값을 AlertDialog에 표출하기

activity_main.xml, dialog1.xml, toast1.xml 은 위 파일과 같음

package com.example.it.myapplication7_9;

import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    EditText edtName, edtEmail;
    Button button1;
    EditText dlgEdtName, dlgEdtEmail;
    TextView toastText;
    View dialogView, toastView;

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

        edtName = (EditText) findViewById(R.id.edtName);
        edtEmail = (EditText) findViewById(R.id.edtEmail);
        button1 = (Button) findViewById(R.id.button1);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dialogView = (View) View.inflate(MainActivity.this, R.layout.dialog1, null);

                AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                dlg.setTitle("사용자 정보 입력");
                dlg.setIcon(R.drawable.ic_launcher_background);

                dlgEdtName = (EditText) dialogView.findViewById(R.id.dlgEdt1);
                dlgEdtEmail = (EditText) dialogView.findViewById(R.id.dlgEdt2);
                dlgEdtName.setText(edtName.getText().toString());
                dlgEdtEmail.setText(edtEmail.getText().toString());

                dlg.setView(dialogView);

                dlg.setPositiveButton("확인", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dlgEdtName = (EditText) dialogView.findViewById(R.id.dlgEdt1);
                        dlgEdtEmail = (EditText) dialogView.findViewById(R.id.dlgEdt2);

                        edtName.setText(dlgEdtName.getText().toString());
                        edtEmail.setText(dlgEdtEmail.getText().toString());

                    }
                });

                dlg.setNegativeButton("취소", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast toast = new Toast(MainActivity.this);

                        toastView = (View) View.inflate(MainActivity.this, R.layout.toast1, null);
                        toastText = (TextView) toastView.findViewById(R.id.toastText1);
                        toastText.setText("취소했습니다.");
                        toast.setView(toastView);
                        toast.show();
                    }
                });
                dlg.show();
            }
        });
    }
}