andriod first app-computer

个人信息：就读于燕大本科软件工程专业 目前大三;

本人博客：google搜索“cqs_2012”即可;

个人爱好：酷爱数据结构和算法，希望将来从事算法工作为人民作出自己的贡献;

编程语言：java ;

编程坏境：Windows 7 专业版 x64;

编程工具：jdk，eclipse，AVD;

制图工具：office 2010 powerpoint;

硬件信息：7G-3 笔记本;

自己想说的话

以前没有接触过andriod开发，突然接触后感觉很喜欢，难度不是很大，今天自己写了一个andriod小应用，名为计算器，实现计算功能。

自己程序截图

开始时，输入框为0，点击1 等待输入

继续操作，点击2

然后点击操作，如+

这时候数据框会自动清零，然后等待输入，点击5

然后点击=

其他功能不再显示。

本程序见面布局XML文件

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#000">

        <EditText
            android:id="@+id/computerfirstedt"
            android:layout_width="fill_parent"
            android:layout_height="50dp"
            android:layout_x="0dp"
            android:layout_y="0dp"
            android:ems="10">
        </EditText>

        <Button
            android:id="@+id/btnnumber1"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
 			android:layout_x="0dp"
 			android:layout_y="50dp"
            android:text="1" />
        <Button
            android:id="@+id/btnnumber2"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
 			android:layout_x="60dp"
 			android:layout_y="50dp"

            android:text="2" />
        <Button
            android:id="@+id/btnnumber3"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="120dp"
 			android:layout_y="50dp"
            android:text="3" />

        <Button
            android:id="@+id/btnnumber4"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="180dp"
 			android:layout_y="50dp"
            android:text="4" />

        <Button
            android:id="@+id/btnnumber5"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="0dp"
 			android:layout_y="110dp"
            android:text="5" />
        <Button
            android:id="@+id/btnnumber6"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="60dp"
 			android:layout_y="110dp"
            android:text="6" />
        <Button
            android:id="@+id/btnnumber7"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="120dp"
 			android:layout_y="110dp"
            android:text="7" />
        <Button
            android:id="@+id/btnnumber8"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="180dp"
 			android:layout_y="110dp"
            android:text="8" />  

        <Button
            android:id="@+id/btnnumber9"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="0dp"
 			android:layout_y="170dp"
            android:text="9" />
        <Button
            android:id="@+id/btnnumber0"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="60dp"
 			android:layout_y="170dp"
            android:text="0" />
        <Button
            android:id="@+id/btnnumberC"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
               android:layout_x="120dp"
 			android:layout_y="170dp"
            android:text="清空" />
        <Button
            android:id="@+id/btnnumberR"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="180dp"
 			android:layout_y="170dp"
            android:text="=" />     

        <Button
            android:id="@+id/btnnumberM"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="0dp"
 			android:layout_y="230dp"
            android:text="*" />
        <Button
            android:id="@+id/btnnumberA"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="60dp"
 			android:layout_y="230dp"
            android:text="+" />
        <Button
            android:id="@+id/btnnumberS"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
               android:layout_x="120dp"
 			android:layout_y="230dp"
            android:text="-" />
        <Button
            android:id="@+id/btnnumberD"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
             android:layout_x="180dp"
 			android:layout_y="230dp"
            android:text="/" />
</AbsoluteLayout>

本程序后台java activity处理程序

import com.icss.myhello.R.array;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class FirstActivity extends Activity implements OnClickListener
{
	private Button btn0;
	private Button btn1;
	private Button btn2;
	private Button btn3;
	private Button btn4;
	private Button btn5;
	private Button btn6;
	private Button btn7;
	private Button btn8;
	private Button btn9;

	private Button btnM;
	private Button btnD;
	private Button btnA;
	private Button btnS;

	private Button btnR;
	private Button btnC;

	private Integer number1 = 0;
	private Integer number2 = 0;
	private char operation = ' ';

	private EditText result ;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.firstactivity);

		btn0 = (Button) findViewById(R.id.btnnumber0);
		btn1 = (Button) findViewById(R.id.btnnumber1);
		btn2 = (Button) findViewById(R.id.btnnumber2);
		btn3 = (Button) findViewById(R.id.btnnumber3);
		btn4 = (Button) findViewById(R.id.btnnumber4);
		btn5 = (Button) findViewById(R.id.btnnumber5);
		btn6 = (Button) findViewById(R.id.btnnumber6);
		btn7 = (Button) findViewById(R.id.btnnumber7);
		btn8 = (Button) findViewById(R.id.btnnumber8);
		btn9 = (Button) findViewById(R.id.btnnumber9);

		btnA = (Button) findViewById(R.id.btnnumberA);
		btnS = (Button) findViewById(R.id.btnnumberS);
		btnM = (Button) findViewById(R.id.btnnumberM);
		btnD = (Button) findViewById(R.id.btnnumberD);

		btnR = (Button) findViewById(R.id.btnnumberR);
		btnC = (Button) findViewById(R.id.btnnumberC);

		result = (EditText)findViewById(R.id.computerfirstedt);

		btn0.setOnClickListener(this);
		btn1.setOnClickListener(this);
		btn2.setOnClickListener(this);
		btn3.setOnClickListener(this);
		btn4.setOnClickListener(this);
		btn5.setOnClickListener(this);
		btn6.setOnClickListener(this);
		btn7.setOnClickListener(this);
		btn8.setOnClickListener(this);
		btn9.setOnClickListener(this);

		btnA.setOnClickListener(this);
		btnD.setOnClickListener(this);
		btnS.setOnClickListener(this);
		btnM.setOnClickListener(this);

		btnR.setOnClickListener(this);
		btnC.setOnClickListener(this);	

		result.setText(number1.toString());

	}

	@Override
	public void onClick(View view)
	{
		// TODO Auto-generated method stub
		switch (view.getId()) {
		case R.id.btnnumber0:
			number1 = number1*10;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber1:
			number1 = number1*10+1;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber2:
			number1 = number1*10+2;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber3:
			number1 = number1*10+3;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber4:
			number1 = number1*10+4;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber5:
			number1 = number1*10+5;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber6:
			number1 = number1*10+6;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber7:
			number1 = number1*10+7;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber8:
			number1 = number1*10+8;
			result.setText(number1.toString());
			break;
		case R.id.btnnumber9:
			number1 = number1*10+9;
			result.setText(number1.toString());
			break;
		case R.id.btnnumberA:
			number2 = number1;
			operation = '+';
			number1 = 0;
			result.setText(number1.toString());
			break;
		case R.id.btnnumberS:
			number2 = number1;
			operation = '-';
			number1 = 0;
			result.setText(number1.toString());
			break;
		case R.id.btnnumberM:
			number2 = number1;
			operation = '*';
			number1 = 0;
			result.setText(number1.toString());
			break;
		case R.id.btnnumberD:
			number2 = number1;
			operation = '/';
			number1 = 0;
			result.setText(number1.toString());
			break;
		case R.id.btnnumberC:
			number1 = number2 = 0;
			result.setText(number1.toString());
			break;
		case R.id.btnnumberR:
			switch (operation) {
			case '+':
				number1 = number1+number2;
				result.setText(number1.toString());
				number1 = number2 = 0;
				break;
			case '-':
				number1 = number1-number2;
				result.setText(number1.toString());
				number1 = number2 = 0;
				break;
			case '*':
				number1 = number1*number2;
				result.setText(number1.toString());
				number1 = number2 = 0;
				break;
			case '/':
				if(number2 != 0)
				{
					number1 = number1/number2;
					result.setText(number1.toString());
				}
				else result.setText("error input");
				number1 = number2 = 0;
				break;
			default:
				break;
			}
			break;
		default:
			break;
		}
	}

}