android studio 계산기 #2

MainActivity.java

package com.GWdeveloper.calculator;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
 
import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.LoadAdError;
import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.initialization.InitializationStatus;
import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;
 
public class MainActivity extends AppCompatActivity {
    private static final String TAG = "Main_Activity";
 
    private TextView ptResult;
    private TextView ptResult2;
    private String s = null;
    private Button btn[] = new Button[23];
    private ImageView backspace;
    private TextView pttestbox;
    private int bracketcount = 0; //괄호 포인트 0이상일때 ( 쓰기 가능 ) 쓰면 1 포인트씩 차감
    private int dotcount = 1; //점 포인트 1일때 쓸 수 있음 0일 때 못 씀
    private int i=0;
    private AdView mAdView;
    private String log = "LOG";
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        
        //광고관련
        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });
 
 
        mAdView = findViewById(R.id.banner);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);
 
        mAdView.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
                // Code to be executed when an ad finishes loading.
                Log.d(log, "finishes loading.");
            }
 
            @Override
            public void onAdFailedToLoad(LoadAdError adError) {
                // Code to be executed when an ad request fails.
                Log.d(log, "request fails.");
            }
 
            @Override
            public void onAdOpened() {
                // Code to be executed when an ad opens an overlay that
                // covers the screen.
                Log.d(log, "opens an overlay that, covers the screen.");
            }
 
            @Override
            public void onAdClicked() {
                // Code to be executed when the user clicks on an ad.
                Log.d(log, "user clicks on an ad.");
            }
 
            @Override
            public void onAdLeftApplication() {
                // Code to be executed when the user has left the app.
                Log.d(log, "the user has left the app.");
            }
 
            @Override
            public void onAdClosed() {
                // Code to be executed when the user is about to return
                // to the app after tapping on an ad.
                Log.d(log, "user is about to return to the app after tapping on an ad.");
            }
        });
 
        init();
        initListener();
    }
 
    private void init(){
        btn[0]=findViewById(R.id.num_0);
        btn[1]=findViewById(R.id.num_1);
        btn[2]=findViewById(R.id.num_2);
        btn[3]=findViewById(R.id.num_3);
        btn[4]=findViewById(R.id.num_4);
        btn[5]=findViewById(R.id.num_5);
        btn[6]=findViewById(R.id.num_6);
        btn[7]=findViewById(R.id.num_7);
        btn[8]=findViewById(R.id.num_8);
        btn[9]=findViewById(R.id.num_9);
 
        btn[10]=findViewById(R.id.btn_plus);
        btn[11]=findViewById(R.id.btn_minus);
        btn[12]=findViewById(R.id.btn_multiple);
        btn[13]=findViewById(R.id.btn_slush);
        btn[14]=findViewById(R.id.btn_dot);
        btn[15]=findViewById(R.id.btn_per);
        btn[16]=findViewById(R.id.btn_left);
        btn[17]=findViewById(R.id.btn_right);
 
        btn[18]=findViewById(R.id.btn_clear);
        btn[19]=findViewById(R.id.btn_result);
 
        backspace = (ImageView)findViewById(R.id.backspace);
 
        ptResult=findViewById(R.id.et_result); //결과
        ptResult2=findViewById(R.id.et_result2); //연산
        //pttestbox=findViewById(R.id.testbox);
    }
 
 
 
    private void initListener(){
        //pttestbox.setText(ptResult.getText().toString());
        for (int i=0; i<10;i++){
            int I = i;
            btn[i].setOnClickListener((View view)-> {
                char lastchar = 'f';
                if(s!=null) {
                    lastchar = ptResult.getText().toString().charAt(ptResult.getText().toString().length() - 1);
                }
                if (lastchar != ')' || lastchar == 'f') {
                        if (I == 0) {
                            if (s == null && dotcount==1) {
                                ptResult.append("0");
                                ptResult.append(".");
                                dotcount = 0;
                                s += "0.";
                            } else {
                                Button btn = (Button) view;
                                ptResult.append(btn.getText().toString());
 
                                String result3 = ptResult.getText().toString();
                                double a = Double.valueOf(Eval.cal(result3));
                                int b = (int) a;
 
                                if (a == b) {
                                    ptResult2.setText(Integer.toString(b));
                                } else ptResult2.setText(Eval.cal(result3));
 
                                s += btn.getText().toString();
                            }
                        } else {
                            Button btn = (Button) view;
                            ptResult.append(btn.getText().toString());
 
                            String result3 = ptResult.getText().toString();
                            double a = Double.valueOf(Eval.cal(result3));
                            int b = (int) a;
 
                            if (a == b) {
                                ptResult2.setText(Integer.toString(b));
                            } else ptResult2.setText(Eval.cal(result3));
 
                            s += btn.getText().toString();
                            //pttestbox.setText(s);
                        }
                    }
            });
        }
 
        for (int i=10; i<16; i++) {
            int finalI = i;
 
            btn[i].setOnClickListener((View view) -> {
                int I = finalI;
                if(I==14) {
                    if(s!=null){
                        char a = ptResult.getText().toString().charAt(ptResult.getText().toString().length() - 1);
                        if(dotcount == 1) {
                            if(a=='0' || a=='1'|| a=='2'|| a=='3'|| a=='4'|| a=='5'|| a=='6'|| a=='7'|| a=='8'|| a=='9') {
                                Button btn = (Button) view;
                                s = null;
                                ptResult.append(btn.getText().toString());
                                dotcount = 0;
                            }
                        }
                    }
                }
                else {
                    char a = ptResult.getText().toString().charAt(ptResult.getText().toString().length() - 1);
                    if (a == '0' || a == '1' || a == '2' || a == '3' || a == '4' || a == '5' || a == '6' || a == '7' || a == '8' || a == '9' || a == ')') {
                        Button btn = (Button) view;
                        s = null;
                        ptResult.append(btn.getText().toString());
                        //
                        // pttestbox.setText(s);
                        dotcount = 1;
                    }
                }
            });
        }
 
        btn[16].setOnClickListener((View view) -> { //(를 넣었을때
            char bol = 'a';
            if(s!=null) {
                bol = ptResult.getText().toString().charAt(ptResult.getText().toString().length()-1); //식의 맨 마지막 문자를 따와서 연산자 혹은 ( 면 (가 입력되도록 한다.
            }
            if (bol=='+' || bol=='-' || bol=='/' || bol=='*' || bol=='%' || bol=='(' || s==null) {
                bracketcount++;
                ptResult.append("(");
                //pttestbox.setText("123");
                left_right();
            }
        });
        btn[18].setOnClickListener((View view) -> { //clear
            ptResult.setText("");
            ptResult2.setText("");
            s = null;
            bracketcount=0;
            dotcount = 1;
        });
 
        btn[19].setOnClickListener((View view)-> { //result
            if(s != null) {
                ptResult.setText(ptResult2.getText().toString());
                s = ptResult.getText().toString();
 
                //pttestbox.setText(ptResult.getText().toString());
                bracketcount = 0;
                dotcount = 1;
            }
        });
 
        backspace.setOnClickListener((View view)-> {
            if(ptResult.length()>=2) {
                String a = ptResult.getText().toString(); //ptResult 문자열로 받아오기
                String b = a.substring(0, a.length() - 1); //ptResult - 1
                ptResult.setText(b); //ptResult - 1 출력
 
                char f = b.charAt(b.length() - 1); //f는 지우기 전의 문자
                char j = a.charAt(a.length() - 1); //j는 지우는 문자
 
                if (f == '0' || f == '1' || f == '2' || f == '3' || f == '4' || f == '5' || f == '6' || f == '7' || f == '8' || f == '9' || f=='.' || f==')') {
                    if(j=='(') {
                        bracketcount--;
                        if(bracketcount==0) {
                            double c = Double.valueOf(Eval.cal(b));
                            int d = (int) c;
                            if (c == d) {
                                ptResult2.setText(Integer.toString(d));
                            } else ptResult2.setText(Eval.cal(b));
                            //pttestbox.setText(String.valueOf(j));
                        }
                    }
                    else if(j==')') {
                        bracketcount++;
                        if(bracketcount==0) {
                            double c = Double.valueOf(Eval.cal(b));
                            int d = (int) c;
                            if (c == d) {
                                ptResult2.setText(Integer.toString(d));
                            } else ptResult2.setText(Eval.cal(b));
                            //pttestbox.setText(String.valueOf(j));
                        }
                        left_right();
                    }
                    else {
                        if(bracketcount==0) {
                            if(j=='.') dotcount=1;
                            double c = Double.valueOf(Eval.cal(b));
                            int d = (int) c;
                            if (c == d) {
                                ptResult2.setText(Integer.toString(d));
                            } else ptResult2.setText(Eval.cal(b));
                            //pttestbox.setText(String.valueOf(j));
                        }
                    }
                }
 
                else {
                    if(j=='(') {
                        bracketcount--;
                        if(bracketcount==0) {
                            double g = Double.valueOf(Eval.cal(b.substring(0, b.length() - 1)));
                            int h = (int) g;
                            if (h == g) {
                                ptResult2.setText(Integer.toString(h));
                            } else ptResult2.setText(Eval.cal(Double.toString(g)));
                        }
                    }
                    else if(j==')') {
                        bracketcount++;
                        if(bracketcount==0) {
                            double g = Double.valueOf(Eval.cal(b.substring(0, b.length() - 1)));
                            int h = (int) g;
                            if (h == g) {
                                ptResult2.setText(Integer.toString(h));
                            } else ptResult2.setText(Eval.cal(Double.toString(g)));
                        }
                        left_right();
                    }
                    else {
                        if(bracketcount==0) {
                            if(j=='.') dotcount=1;
                            double g = Double.valueOf(Eval.cal(b.substring(0, b.length() - 1)));
                            int h = (int) g;
                            if (h == g) {
                                ptResult2.setText(Integer.toString(h));
                            } else ptResult2.setText(Eval.cal(Double.toString(g)));
                        }
                    }
                }
            }
            else if(ptResult.length()==1) {
                bracketcount = 0;
                dotcount = 1;
                ptResult.setText(null);
                ptResult2.setText(null);
                s = null;
            }
        });
    }
    //괄호를 열었을 때
    private void left_right() {
      //비공개  
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout 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:paddingRight="10dp"
    android:paddingLeft="10dp"
    android:paddingTop="50dp"
    android:stretchColumns="*"
    tools:context=".MainActivity">
 
    <TableLayout
        android:layout_height="0dp"
        android:layout_weight="2">
 
        <TableRow
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="0dp">
 
            <TextView
                android:id="@+id/et_result2"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:hint="R"
                android:textStyle="bold"
                android:textColor="@color/black"
                android:autoSizeTextType="uniform"
                />
 
        </TableRow>
 
 
        <TableRow
            android:layout_width="0dp"
            android:layout_weight="8"
            android:layout_height="match_parent">
            <TextView
                android:id="@+id/et_result"
                android:layout_width="match_parent"
                android:layout_height="100dp"
                android:layout_weight="1"
                android:maxLines="3"
                android:textStyle="bold"
                android:textSize="25sp"
                android:hint="C"
                />
 
        </TableRow>
 
        <TableRow
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="0dp">
            <TextView
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:id="@+id/testbox"
                android:textSize="30sp"/>
            <ImageView
                android:layout_height="wrap_content"
 
                android:id="@+id/backspace"
                android:src="@drawable/ic_round_keyboard_backspace_24"
                />
        </TableRow>
    </TableLayout>
 
    <!-- 첫번째 버튼 줄-->
 
    <TableLayout
        android:layout_height="0dp"
        android:layout_weight="5">
 
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1">
            <Button
                android:id="@+id/btn_clear"
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="C" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_left"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="(" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_right"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text=")" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_per"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="%" />
        </TableRow>
 
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1">
            <Button
                android:id="@+id/num_7"
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="7" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_8"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="8" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_9"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="9" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_plus"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="+" />
        </TableRow>
        <!--첫 번째 버튼 줄 종료-->
 
        <!-- 두 번째 버튼 줄 -->
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1">
            <Button
                android:id="@+id/num_4"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:backgroundTint="@color/black"
                android:autoSizeTextType="uniform"
                android:text="4" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_5"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:backgroundTint="@color/black"
                android:autoSizeTextType="uniform"
                android:text="5" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_6"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:backgroundTint="@color/black"
                android:autoSizeTextType="uniform"
                android:text="6" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_minus"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:backgroundTint="@color/black"
                android:autoSizeTextType="uniform"
                android:text="-" />
        </TableRow>
        <!-- 두 번째 버튼 줄 종료-->
 
        <!--세 번째 버튼 줄 시작-->
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1">
            <Button
                android:id="@+id/num_1"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="1" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_2"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="2" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_3"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="3" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_multiple"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="*" />
        </TableRow>
        <!-- 세 번째 버튼 줄 종료-->
 
        <!-- 네 번째 버튼 줄 시작-->
 
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1">
            <Button
                android:id="@+id/btn_dot"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="." />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/num_0"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="0" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_result"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="=" />
            <TextView
                android:layout_width="10dp"
                android:layout_height="match_parent"/>
            <Button
                android:id="@+id/btn_slush"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:autoSizeTextType="uniform"
                android:backgroundTint="@color/black"
                android:text="/" />
        </TableRow>
 
 
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="4">
 
        </TableRow>
        <!-- 광고 -->
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="0.1">
            <com.google.android.gms.ads.AdView
                xmlns:ads="http://schemas.android.com/apk/res-auto"
                android:id="@+id/banner"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_centerHorizontal="true"
                android:layout_alignParentBottom="true"
                android:layout_weight="0.5"
                ads:adSize="SMART_BANNER"
                ads:adUnitId="ca-app-pub-">
            </com.google.android.gms.ads.AdView>
        </TableRow>
        <!-- 네번째 줄 종료-->
 
    </TableLayout>
</TableLayout>
 

결과

특별한 오류 없이 잘 돌아간다.

다만 autosizetexttype을 활용하여 기기의 크기에 따라서 글자 크기를 바꾸고 싶었지만,

적용이 안되더라... 왜 그런지 모르겠다.

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play store 다운로드 링크

play.google.com/store/apps/details?id=com.GWdeveloper.calculator

초간단 계산기 - Google Play 앱

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참고 블로그

itstudy-mary.tistory.com/179

안드로이드 스튜디오,java] 간단한 계산기 앱 만들기

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위의 코드를 실행시키기 위해선 밑의 사이트에 접속 후

jar 파일 다운로드 -> library에 추가해야 Eval class가 정상적으로 작동할 수 있다.

ScriptEngine, ScriptEngineManager download www.java2s.com/Code/Jar/j/Downloadjsr223jar.htm

Download jsr223.jar : jsr223 « j « Jar File Download