Andriod First App-computer

Andriod First App-computer

Personal information: studied at Yan University undergraduate software engineering major at present;

I blog: Google search "cqs_2012" can be;

Personal Hobbies: Love data structure and algorithms, hope to work in the future algorithm to make their own contribution to the people;

Programming language: Java;

Programming Bad Environment: Windows 7 Professional Edition x64;

Programming Tools: JDK,ECLIPSE,AVD;

Cartographic tools: Office in PowerPoint;

Hardware information: 7g-3 notebook;

What you want to say.

Previously did not contact the andriod development, the sudden contact feeling very like, the difficulty is not very big, today wrote a andriod small application, called the calculator, realize the calculation function.

Own program

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

Continue, click 2

Then click Actions, such as +

When the data frame is automatically zeroed, and then waits for input, click 5

Then click =

Other features are no longer displayed.

This program meets the layout XML file

<?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:lay Out_width= "Fill_parent" android:layout_height= "50DP" android:layout_x= "0DP" android:layou T_y= "0DP" android:ems= "> </EditText> <button android:id=" @+id/btnnumbe R1 "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" and            Roid: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_hei                     ght= "Wrap_content" android:layout_x= "180DP" android:layout_y= "50DP" android:text= "4"/> <button android:id= "@+id/btnnumber5" android:layout_width= "50DP" android:l        ayout_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 an             Droid:id= "@+id/btnnumber0" android:layout_width= "50DP" android:layout_height= "Wrap_content" android:layout_x= "60DP" android:layout_y= "170DP" android:text= "0"/> <button an Droid:id= "@+id/btnnumberC "android:layout_width=" 50DP "android:layout_height=" Wrap_content "android:layout_x=" 120DP "android:layout_y=" 170DP "android:text=" Empty "/> <button android:id=" @+id/btnnum BerR "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= "@+i D/btnnumbera "android:layout_width=" 50DP "android:layout_height=" Wrap_content "android:l ayout_x= "60DP" android:layout_y= "230DP" android:text= "+"/> <button android:id= "@+i           D/btnnumbers " Android:layout_width= "50DP" android:layout_height= "wrap_content" android:layout_x= "120DP" Androi            D:layout_y= "230DP" android:text= "-"/> <button android:id= "@+id/btnnumberd" Android:layout_width= "50DP" android:layout_height= "wrap_content" android:layout_x= "180DP" Androi D:layout_y= "230DP" android:text= "/"/> </AbsoluteLayout>

This program background Java activity handler

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 Bu Tton btn2;private button btn3;private button btn4;private button btn5;private button btn6;private button btn7;private Butt  On 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 = ';p rivate Edi Ttext 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;}}}

Andriod First App-computer