简易计算器Android版(源码)

简易计算器Android版（源码）

说明：每完成一次计算后，需先clear 清除记忆，当然也可以连算

XML布局

xmlns:android="https://www.360docs.net/doc/939374363.html,/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical">

android:id="@+id/tableLayout1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:collapseColumns="4">

android:id="@+id/tableRow_et"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/et"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:layout_span="4"

android:focusable="false"

android:singleLine="true"

android:inputType="text"

android:gravity="right">

android:id="@+id/tableRow1"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/bt_7"

android:layout_width="40px"

android:layout_height="40px"

android:text="7"/>

android:id="@+id/bt_8"

android:layout_width="40px"

android:layout_height="40px"

android:text="8"/>

android:id="@+id/bt_9"

android:layout_width="40px"

android:layout_height="40px"

android:text="9"/>

android:id="@+id/bt_back"

android:layout_width="40px"

android:layout_height="40px"

android:text="back"/>

android:id="@+id/tableRow2"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/bt_4"

android:layout_width="40px"

android:layout_height="40px"

android:text="4"/>

android:id="@+id/bt_5"

android:layout_width="40px"

android:layout_height="40px"

android:text="5"/>

android:id="@+id/bt_6"

android:layout_width="40px"

android:layout_height="40px"

android:text="6"/>

android:id="@+id/bt_divide"

android:layout_width="40px"

android:layout_height="40px"

android:text="/"/>

android:id="@+id/tableRow3"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/bt_1"

android:layout_width="40px"

android:layout_height="40px"

android:text="1"/>

android:id="@+id/bt_2"

android:layout_width="40px"

android:layout_height="40px"

android:text="2"/>

android:id="@+id/bt_3"

android:layout_width="40px"

android:layout_height="40px"

android:text="3"/>

android:id="@+id/bt_multiply"

android:layout_width="40px"

android:layout_height="40px"

android:text="*"/>

android:id="@+id/tableRow4"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/bt_0"

android:layout_width="50px"

android:layout_height="40px"

android:text="0"/>

android:id="@+id/bt_point"

android:layout_width="50px"

android:layout_height="40px"

android:text="."/>

android:id="@+id/bt_add"

android:layout_width="50px"

android:layout_height="40px"

android:text="+"/>

android:id="@+id/bt_sub"

android:layout_width="50px"

android:layout_height="40px"

android:text="-"/>

android:id="@+id/tableRow4"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/bt_equal"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:layout_span="3"

android:text="="/>

android:id="@+id/bt_clear"

android:layout_width="50px"

android:layout_height="40px"

android:text="clear"/>

源代码：

package android.sdk;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class Android_calculatorActivity extends Activity {

private Button bt_1;

private Button bt_2;

private Button bt_3;

private Button bt_4;

private Button bt_5;

private Button bt_6;

private Button bt_7;

private Button bt_8;

private Button bt_9;

private Button bt_0;

private Button bt_add;

private Button bt_sub; // 减

private Button bt_multiply; // 乘

private Button bt_divide; // 除

private Button bt_back;

private Button bt_equal; // 等于

private Button bt_point; // 点

private Button bt_clear; // 清除

private EditText et_play; // 显示

private String str_oper = "+"; // 运算符

private StringBuffer str_display = new StringBuffer();; // 显示private String str_result; // 结果显示

private double num1;

private double num2;

private boolean flag = true; // 小数点个数开关控制；

private boolean b_sub, b_mul, b_div; // 运算符开关控制

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(https://www.360docs.net/doc/939374363.html,yout.main);

bt_0 = (Button) findViewById(R.id.bt_0);

bt_1 = (Button) findViewById(R.id.bt_1);

bt_2 = (Button) findViewById(R.id.bt_2);

bt_3 = (Button) findViewById(R.id.bt_3);

bt_4 = (Button) findViewById(R.id.bt_4);

bt_5 = (Button) findViewById(R.id.bt_5);

bt_6 = (Button) findViewById(R.id.bt_6);

bt_7 = (Button) findViewById(R.id.bt_7);

bt_8 = (Button) findViewById(R.id.bt_8);

bt_9 = (Button) findViewById(R.id.bt_9);

bt_add = (Button) findViewById(R.id.bt_add);

bt_sub = (Button) findViewById(R.id.bt_sub);

bt_multiply = (Button) findViewById(R.id.bt_multiply);

bt_divide = (Button) findViewById(R.id.bt_divide);

bt_back = (Button) findViewById(R.id.bt_back);

bt_equal = (Button) findViewById(R.id.bt_equal); bt_point = (Button) findViewById(R.id.bt_point); bt_clear = (Button) findViewById(R.id.bt_clear); et_play = (EditText) findViewById(R.id.et);

et_play.setText("0.0");

bt_0.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("0");

et_play.setText(str_display.toString());

}

});

bt_1.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("1");

et_play.setText(str_display.toString());

}

});

bt_2.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("2");

et_play.setText(str_display.toString());

}

});

bt_3.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("3");

et_play.setText(str_display.toString());

}

});

bt_4.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("4");

et_play.setText(str_display.toString());

}

});

bt_5.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("5");

et_play.setText(str_display.toString());

}

});

bt_6.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("6");

et_play.setText(str_display.toString());

}

});

bt_7.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v)

{

str_display.append("7");

et_play.setText(str_display.toString());

}

});

bt_8.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_display.append("8");

et_play.setText(str_display.toString());

}

});

bt_9.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_display.append("9");

et_play.setText(str_display.toString());

}

});

bt_point.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

if (flag)

{

str_display.append(".");

flag = false;

}

});

bt_back.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

if (str_display.length() != 0)

{

str_display.deleteCharAt(str_display.length() - 1);

et_play.setText(str_display.toString());

}

});

bt_add.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_oper = "+";

if (!(str_display.toString() == ""))

{

num1 += Double.parseDouble(str_display.toString());

str_display = new StringBuffer("");

}

if (!(str_result == null))

{

num1 = Double.parseDouble(str_result);

str_result = null;

}

et_play.setText(String.valueOf(num1));

flag = true;

}

});

bt_sub.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_oper = "-";

if (!b_sub && !(str_display.toString() == ""))

{

num1 = Double.parseDouble(str_display.toString());

et_play.setText(String.valueOf(num1));

str_display = new StringBuffer("");

b_sub = true;

} else

{

if (!(str_display.toString() == ""))

{

num1 -=

Double.parseDouble(str_display.toString());

str_display = new StringBuffer("");

}

if (!(str_result == null))

{

num1 = Double.parseDouble(str_result);

str_result = null;

}

et_play.setText(String.valueOf(num1));

}

flag = true;

}

});

bt_multiply.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_oper = "*";

if (!b_mul && !(str_display.toString() == ""))

{

num1 = Double.parseDouble(str_display.toString());

et_play.setText(String.valueOf(num1));

str_display = new StringBuffer("");

b_mul = true;

} else

{

if (!(str_display.toString() == ""))

{

num1 *=

Double.parseDouble(str_display.toString());

str_display = new StringBuffer("");

}

if (!(str_result == null))

{

num1 = Double.parseDouble(str_result);

str_result = null;

}

et_play.setText(String.valueOf(num1));

}

flag = true;

}

});

bt_divide.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_oper = "/";

if (!b_div && !(str_display.toString() == ""))

{

num1 = Double.parseDouble(str_display.toString());

et_play.setText(String.valueOf(num1));

str_display = new StringBuffer("");

b_div = true;

} else

{

if (!(str_display.toString() == ""))

{

if(Double.parseDouble(str_display.toString()) == 0)

{

Toast.makeText(Android_calculatorActivity.this,

"除数不能为0！",

Toast.LENGTH_LONG).show();

} else

{

num1 /=

Double.parseDouble(str_display.toString());

str_display = new StringBuffer("");

}

if (!(str_result == null))

{

num1 = Double.parseDouble(str_result);

str_result = null;

}

et_play.setText(String.valueOf(num1));

}

flag = true;

}

});

bt_clear.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

str_oper = "+";

str_display = new StringBuffer("");

str_result = null;

num1 = 0;

num2 = 0;

flag = true;

b_sub = false;

b_mul = false;

b_div = false;

et_play.setText("0.0");

}

});

bt_equal.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

if (str_oper.equals("+"))

{

num2 = Double.parseDouble(str_display.toString());

str_result = String.valueOf((num1 + num2));

et_play.setText(str_result);

str_display = new StringBuffer("");

}

if (str_oper.equals("-"))

{

num2 = Double.parseDouble(str_display.toString());

str_result = String.valueOf((num1 - num2));

et_play.setText(str_result);

str_display = new StringBuffer("");

}

if (str_oper.equals("*"))

{

num2 = Double.parseDouble(str_display.toString());

str_result = String.valueOf((num1 * num2));

et_play.setText(str_result);

str_display = new StringBuffer("");

}

if (str_oper.equals("/"))

{

num2 = Double.parseDouble(str_display.toString());

if (!(num2 == 0))

{

str_result = String.valueOf((num1 / num2));

et_play.setText(str_result);

} else

{

Toast.makeText(Android_calculatorActivity.this,

"除数不能为0！", Toast.LENGTH_LONG).show();

}

str_display = new StringBuffer("");

}

});

}

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