mainac.java

package com.example.dentakutest;


import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {

  float number1;
	float number2;
	float answer;
	float ope;

	TextView num1Text;
	TextView opeText;
	TextView num2Text;
	TextView answerText;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//各変数を初期化
		number1 = 0;
		number2 = 0;
		answer = 0;
		ope = 0;

		//ラベルを関連づけ
        num1Text = (TextView)findViewById(R.id.num1);
		opeText = (TextView)findViewById(R.id.ope);
		num2Text = (TextView)findViewById(R.id.num2);
		answerText = (TextView)findViewById(R.id.answer);

		//ラベルの値を初期状態に
		num1Text.setText("0");
		opeText.setText("");
		num2Text.setText("");
		answerText.setText("");
	}
	//「1」ボタンが押されたとき
	public void bt1 (View v){
		if (ope == 0){
		number1 = number1*10 + 1;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 1;
			num2Text.setText(number2+"");
			}
	}
	public void bt2 (View v){
		if (ope == 0){
		number1 = number1*10 + 2;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 2;
			num2Text.setText(number2+"");
		}
	}
	public void bt3 (View v){
		if (ope == 0){
		number1 = number1*10 + 3;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 3;
			num2Text.setText(number2+"");
		}
	}
	public void bt4 (View v){
		if (ope == 0){
		number1 = number1*10 + 4;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 4;
			num2Text.setText(number2+"");
		}
	}
	public void bt5 (View v){
		if (ope == 0){
		number1 = number1*10 + 5;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 5;
			num2Text.setText(number2+"");
		}
	}
	public void bt6 (View v){
		if (ope == 0){
		number1 = number1*10 + 6;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 6;
			num2Text.setText(number2+"");
		}
	}
	public void bt7 (View v){
		if (ope == 0){
		number1 = number1*10 + 7;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 7;
			num2Text.setText(number2+"");
		}
	}
	public void bt8 (View v){
		if (ope == 0){
		number1 = number1*10 + 8;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 8;
			num2Text.setText(number2+"");
		}
	}
	public void bt9 (View v){
		if (ope == 0){
		number1 = number1*10 + 9;
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 9;
			num2Text.setText(number2+"");
		}
	}
	public void bt0 (View v){
		if (ope == 0){
		number1 = number1*10 + 0;
		//+0はなくてもいい
		num1Text.setText(number1+"");
		}else if (ope > 0){
			number2 = number2*10 + 0;
			num2Text.setText(number2+"");
		}
	}

	//「+」ボタンが押されたとき
	public void btplus (View v){
		ope = 1;
		opeText.setText("+");
		num2Text.setText("0");
	}
	public void btminus (View v){
		ope = 2;
		opeText.setText("-");
		num2Text.setText("0");
		}
	public void btmultiply (View v){
		ope = 3;
		opeText.setText("*");
		num2Text.setText("0");
		}
	public void btdivide (View v){
		ope = 4;
		opeText.setText("/");
		num2Text.setText("0");
		}
	//「=」ボタンが押されたとき
	public void btequal (View v){
		if (ope == 1){
			answer = number1 + number2;
			answerText.setText("=" + answer);
			ope = -1;
		}else if (ope == 2){
			answer = number1 - number2;
			answerText.setText("=" + answer);
			ope = -1;
		}else if (ope == 3){
			answer = number1 * number2;
			answerText.setText("=" + answer);
			ope = -1;
		}else if (ope == 4){
			answer = number1 / number2;
			answerText.setText("=" + answer);
			ope = -1;
		}
	}
	public void btclear (View v){
		ope = 0;
		opeText.setText("");
		number1 = 0;
		num1Text.setText("");
		number2 = 0;
		num2Text.setText("");
		answer = 0;
		answerText.setText("");
		}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}