夜子まま塾講義3（androidで電卓アプリを作る）

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Re:Kayo-System Co.,Ltd.

2012 2 22


2012 2 22

<?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="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />

</LinearLayout>


2012 2 22

package ykmjuku.android.sample.app;

public class Calculater {
StringBuilder mInputNumber = new StringBuilder();
String mOperator;
int mResult = 0;

private boolean isNumber(String key) {
try {
Integer.parseInt(key);
return true;
} catch (NumberFormatException e) {
}
return false;
}


2012 2 22

private boolean isSupportedOperator(String key) {
if (key.equals("+")) {
return true;
} else if (key.equals("-")) {
return true;
} else if (key.equals("*")) {
return true;
} else if (key.equals("/")) {
return true;
}
return false;
}


2012 2 22

private void doCalculation(String ope) {
if (ope.equals("+")) {
mResult = mResult + Integer.parseInt(mInputNumber.toString());
} else if (ope.equals("-")) {
mResult = mResult - Integer.parseInt(mInputNumber.toString());
} else if (ope.equals("*")) {
mResult = mResult * Integer.parseInt(mInputNumber.toString());
} else if (ope.equals("/")) {
mResult = mResult / Integer.parseInt(mInputNumber.toString());
}
mInputNumber = new StringBuilder();
}


2012 2 22

public String putInput(String key) {
if (isNumber(key)) {
mInputNumber.append(key);
return mInputNumber.toString();
} else if (isSupportedOperator(key)) {
if (mOperator != null) {
doCalculation(mOperator);
mOperator = null;
} else if (mInputNumber.length() > 0) {
mResult = Integer.parseInt(mInputNumber.toString());
mInputNumber = new StringBuilder();
}
mOperator = key;
return mOperator;
} else if (key.equals("=")) {
if (mOperator != null) {
doCalculation(mOperator);
mOperator = null;
}
return Integer.toString(mResult);
} else {
//
return null;
}
}
}


2012 2 22

(bit)

boolean 1 true/false FALSE

char 16 0 FFFF 0

byte 8 -128 127 0

short 16 -32768 32767 0

int 32 0

long 64 0

float 32 0.0

double 64 0.0


2012 2 22

try {
Integer.parseInt(key);
return true;
} catch (NumberFormatException e) {
}
return false;


2012 2 22

Ykmjuku002Activity
”OK”


2012 2 22

package ykmjuku.android.sample.app;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Ykmjuku002Activity extends Activity implements TextWatcher,
OnClickListener {
EditText mEditText1;
TextView mTextView1;
Button mButton1;
Calculater mCalculater = new Calculater();


2012 2 22

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

mTextView1 = (TextView)findViewById(R.id.textView1);
mEditText1 = (EditText)findViewById(R.id.editText1);
mButton1 = (Button)findViewById(R.id.button1);

mEditText1.addTextChangedListener(this);
mButton1.setOnClickListener(this);
}


2012 2 22

public void afterTextChanged(Editable s) {
String input = s.toString();
Log.d("Ykmjuku002Activity", "input="+input);
if(input.length()>0){
String dispText = mCalculater.putInput(input);
if(dispText!=null){
mTextView1.setText(dispText);
}
s.clear();
}
}

public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub

}

public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub

}


2012 2 22

public void onClick(View v) {
String dispText = mCalculater.putInput("=");
if(dispText!=null){
mTextView1.setText(dispText);
}
mEditText1.setText(null);
}
}


2012 2 22

夜子まま塾講義3（androidで電卓アプリを作る）

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