알림창 띄우기(Multi Choice, Single Choice)

#알림창 띄우기

• Android는 Chaining을 매우 좋아한다.

• HTML의 Alert, Confirm 등을 혼합한 것과 유사하다.

• 총 3가지 유형의 버튼을 제공한다. 세가지 버튼을 굳이 다 만들 필요는 없다. 하지만 위치는 지정되어 있다.

• Positive Button(예)

• Neutral Button(취소)

• Negative Button(아니오)

• AlertDialog로 제공되며, 사용을 위해 아래의 항목이 필요함.

• Title

• Message

• Buttons

• Icons(Optional)

#알림창 띄우기 실습

@Override

public void onBackPressed() {

  //super.onBackPressed();

  // Alert을 띄워 종료시키기

  AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);

  dialog  .setTitle("종료 알림")

          .setMessage("정말 종료하시겠습니까?")

          .setPositiveButton("종료합니다.", new DialogInterface.OnClickListener() {

              @Override

              public void onClick(DialogInterface dialog, int which) {

                  finish();

              }

          })

          .setNeutralButton("취소합니다", new DialogInterface.OnClickListener() {

              @Override

              public void onClick(DialogInterface dialog, int which) {

                  Toast.makeText(MainActivity.this, "취소했습니다.", Toast.LENGTH_SHORT).show();

              }

          })

          .setNegativeButton("아니요", new DialogInterface.OnClickListener() {

              @Override

              public void onClick(DialogInterface dialog, int which) {

                  Toast.makeText(MainActivity.this, "종료하지 않습니다.", Toast.LENGTH_SHORT).show();

              }

          }).create().show();

}

#항목 선택창 띄우기_Multi Choice

1. activity_main.xml 에서 버튼을 만들어준다.

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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.ktds.smahn.mydialog.MainActivity">    <Button        android:id="@+id/btnDialog"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" /> </RelativeLayout> Colored by Color Scripter

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2. MainActivity.java 내용을 작성한다.

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package com.ktds.smahn.mydialog; 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.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity {    private Button btnDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btnDialog = (Button) findViewById(R.id.btnDialog);        final List<String> selectedItems = new ArrayList<String>();        btnDialog.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                final String[] items = new String[]{"IT/Computer", "Game", "Fashion", "VR", "Kidult", "Sports", "Music", "Movie"};                AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);                dialog.setTitle("관심분야를 선택하세요.")                        .setMultiChoiceItems(items,                                new boolean[]{false, false, false, false, false, false, false, false},                                new DialogInterface.OnMultiChoiceClickListener() {                                    @Override                                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {                                        if(isChecked) {                                            Toast.makeText(MainActivity.this, items[which], Toast.LENGTH_SHORT).show();                                            selectedItems.add(items[which]);                                        }                                        else{                                            selectedItems.remove(items[which]);                                        }                                    }                                })                        .setPositiveButton("확인", new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface dialog, int which) {                                if( selectedItems.size() == 0 ){                                    Toast.makeText(MainActivity.this, "선택된 관심분야가 없습니다.", Toast.LENGTH_SHORT).show();                                }                                else {                                    String items = "";                                    for(String selectedItem : selectedItems) {                                        items += (selectedItem + ", ");                                    }                                    //초기화                                    selectedItems.clear();                                    items = items.substring(0, items.length() - 2);                                    Toast.makeText(MainActivity.this, items, Toast.LENGTH_SHORT).show();                                }                            }                        }).create().show();            }        });    } } Colored by Color Scripter

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3. 실행한다.

#항목 선택창 띄우기_Single Choice

1. 버튼 추가

<Button

  android:id="@+id/btnDialog2"

  android:layout_width="wrap_content"

  android:layout_height="wrap_content"

  android:text="Single Choice"

  android:layout_below="@+id/btnDialog"

  android:layout_alignRight="@+id/btnDialog"

  android:layout_alignEnd="@+id/btnDialog" />

2. 메소드 추가

btnDialog2.setOnClickListener(new View.OnClickListener() {

  @Override

  public void onClick(View v) {

      final String[] items = new String[]{"IT/Computer", "Game", "Fashion", "VR", "Kidult", "Sports", "Music", "Movie"};

      final int[] selectedIndex = {0};

      AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);

      dialog.setTitle("관심분야를 선택하세요.")

              .setSingleChoiceItems(items,

                      0,

                      new DialogInterface.OnClickListener() {

                          @Override

                          public void onClick(DialogInterface dialog, int which) {

                              selectedIndex[0] = which;

                          }

                      })

              .setPositiveButton("확인", new DialogInterface.OnClickListener() {

                  @Override

                  public void onClick(DialogInterface dialog, int which) {

                      Toast.makeText(MainActivity.this, items[selectedIndex[0]], Toast.LENGTH_SHORT).show();

                  }

              }).create().show();

  }

});

3. 실행