Andriod first app-computer

Andriod first app-computer

Andriod first app-computer

Personal information: He is a junior majoring in software engineering at yanda University;

My blog: google searches for "cqs_2012;

My hobbies: I love data structures and algorithms and hope to make my own contribution to algorithm work in the future;

Programming Language: java;

Programming Environment: Windows 7 Professional Edition x64;

Programming tools: jdk, eclipse, AVD;

Drawing tools: office 2010 powerpoint;

Hardware information: 7G-3 Notebook;

What you want to say

I have never touched on andriod development before. I suddenly liked it, but it was not very difficult. Today I wrote a small andriod application called a calculator to implement the computing function.

Self-Program

At the beginning, the input box is 0. Click 1 to wait for the input.

Continue. Click 2.

Then click operations, such as +

At this time, the data box will be automatically cleared, and then wait for the input, click 5

Then click =

Other functions are not displayed.

This program meets the XML file Layout

Java activity processing program in the background of this program

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 ;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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());}@Overridepublic void onClick(View view){// TODO Auto-generated method stubswitch (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;}}}