Android---9---simple calculator

Do a simple calculator, can only achieve a simple arithmetic.

Activity_main.xml:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" fill_parent "android:layout_height=" Fill_parent "Android:orienta tion= "vertical" android:paddingbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_ Horizontal_margin "android:paddingright=" @dimen/activity_horizontal_margin "android:paddingtop=" @dimen/activity_         Vertical_margin "tools:context=" com.example.calculator.MainActivity "> <textview android:id=" @+id/show " Android:layout_width= "Fill_parent" android:layout_height= "wrap_content" android:gravity= "Center_vert ical "android:hint=" 0 "android:minlines=" 3 "/> <button android:id=" @+id/clean "Androi D:layout_width= "Fill_parent" android:layout_height= "wrap_content" android:layout_below= "@id/show" and roid:text= "Clear"/> <button android:id= "@+Id/seven "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:layout_bel ow= "@+id/clean" android:text= "7"/> <button android:id= "@+id/eight" android:layout_width= "WR Ap_content "android:layout_height=" wrap_content "android:layout_alignbottom=" @+id/seven "Android:layo ut_torightof= "@+id/seven" android:text= "8"/> <button android:id= "@+id/nine" Android:layout_ Width= "Wrap_content" android:layout_height= "wrap_content" android:layout_alignbaseline= "@+id/eight" a Ndroid:layout_alignbottom= "@+id/eight" android:layout_torightof= "@+id/eight" android:text= "9"/> <B        Utton android:id= "@+id/add" android:layout_width= "wrap_content" android:layout_height= "Wrap_content" Android:layout_alignbaseline= "@+id/nine" android:layout_alignbottom= "@+id/nine" Android:layout_torigh Tof= "@+id/nine" android:text= "+"/> <button android:id= "@+id/four" android:layout_width= "Wrap_content" Androi        d:layout_height= "Wrap_content" android:layout_alignright= "@+id/seven" android:layout_below= "@+id/seven" android:text= "4"/> <button android:id= "@+id/five" android:layout_width= "Wrap_content" an droid:layout_height= "Wrap_content" android:layout_alignbaseline= "@+id/four" android:layout_alignbottom= "@+id /four "android:layout_alignleft=" @+id/eight "android:text=" 5 "/> <button android:id=" @+id/si X "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:layout_alignbasel Ine= "@+id/five" android:layout_alignbottom= "@+id/five" android:layout_torightof= "@+id/five" android:t ext= "6"/> <button android:id= "@+id/subtract" android:layout_width= "Wrap_content" Android:la Yout_height= "Wrap_contenT "android:layout_alignbaseline=" @+id/six "android:layout_alignbottom=" @+id/six "Android:layout_torig htof= "@+id/six" android:text= "-"/> <button android:id= "@+id/one" android:layout_width= "wrap _content "android:layout_height=" wrap_content "android:layout_alignleft=" @+id/four "Android:layout_be low= "@+id/four" android:text= "1"/> <button android:id= "@+id/two" android:layout_width= "wrap _content "android:layout_height=" wrap_content "android:layout_alignleft=" @+id/five "Android:layout_be low= "@+id/five" android:text= "2"/> <button android:id= "@+id/three" android:layout_width= "WR Ap_content "android:layout_height=" wrap_content "android:layout_alignbaseline=" @+id/two "Android:layo Ut_alignbottom= "@+id/two" android:layout_alignleft= "@+id/six" android:text= "3"/> <button an Droid:id= "@+id/multiply"        Android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" Android:layout_alignbaselin E= "@+id/three" android:layout_alignbottom= "@+id/three" android:layout_torightof= "@+id/three" Android: text= "*"/> <button android:id= "@+id/zero" android:layout_width= "Wrap_content" android:layou t_height= "Wrap_content" android:layout_alignleft= "@+id/one" android:layout_alignright= "@+id/one" Android oid:layout_below= "@+id/one" android:text= "0"/> <button android:id= "@+id/point" Android:layo        Ut_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_alignbaseline= "@+id/zero" Android:layout_alignbottom= "@+id/zero" android:layout_toleftof= "@+id/multiply" android:text= "."/> &L T Button android:id= "@+id/divide" android:layout_width= "wrap_content" android:layout_height= "Wrap_conte NT "Android:layout_alignleft= "@+id/multiply" android:layout_below= "@+id/multiply" android:text= "/"/> <Button        Android:id= "@+id/symbol" android:layout_width= "wrap_content" android:layout_height= "Wrap_content"        android:layout_below= "@+id/one" android:layout_torightof= "@+id/one" android:text= "-/+"/> <Button        Android:id= "@+id/result" android:layout_width= "wrap_content" android:layout_height= "Wrap_content" android:layout_alignleft= "@+id/zero" android:layout_alignright= "@+id/divide" android:layout_below= "@+id/z Ero "android:text=" = "/></relativelayout>

Mainactivity.java:

Package Com.example.calculator;import Android. R.integer;import android.app.activity;import android.os.bundle;import Android.util.log;import android.view.Menu; Import Android.view.menuitem;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.edittext;import Android.widget.textview;public class MainActivity Extends Activity implements Onclicklistener {Private Button One, I, three, four, five, six, seven, eight, nine, Zero;pri Vate button Add, subtract, multiply, divide;private button Symbol, point;private button clean, result;private TextView Sho Wresult;double num1, num2, num;int op = 0;protected void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (r.layout.activity_main);//0---9one = (Button) Findviewbyid (R.id.one); button) Findviewbyid (r.id.two), three = (button) Findviewbyid (r.id.three), four = (button) Findviewbyid (R.id.four); five = (Button) Findviewbyid (r.id.five); six = (ButtoN) Findviewbyid (r.id.six), seven = (button) Findviewbyid (R.id.seven), eight = (button) Findviewbyid (r.id.eight); nine = ( button) Findviewbyid (r.id.nine), zero = (button) Findviewbyid (R.id.zero);//+-*/add = (Button) Findviewbyid (R.id.add); Subtract = (button) Findviewbyid (r.id.subtract), multiply = (button) Findviewbyid (r.id.multiply);d ivide = (Button) Findviewbyid (r.id.divide);p oint = (button) Findviewbyid (r.id.point); clean = (Button) Findviewbyid (r.id.clean); result = (Button) Findviewbyid (R.id.result); Showresult = (TextView) Findviewbyid (r.id.show); Clean.setonclicklistener (this), Zero.setonclicklistener (this); O Ne.setonclicklistener (This), Two.setonclicklistener (This), Three.setonclicklistener (this); Four.setonclicklistener (This), Five.setonclicklistener (This), Six.setonclicklistener (this); Seven.setonclicklistener (This), Eight.setonclicklistener (This), Nine.setonclicklistener (this); Add.setonclicklistener (This), Subtract.setonclicklistener (This), Multiply.setonclicklistener (this); Divide.setonclicklistEner (This);p Oint.setonclicklistener (This), Result.setonclicklistener (this);} @Overridepublic void OnClick (View v) {String content = ""; Switch (V.getid ()) {//0---9case r.id.one:content = showresult.g Ettext (). toString () + "1"; Showresult.settext (content); Break;case r.id.two:content = Showresult.gettext (). toString () + "2"; Showresult.settext (content); Break;case r.id.three:content = Showresult.gettext (). toString () + "3"; Showresult.settext (content); Break;case r.id.four:content = Showresult.gettext (). toString () + "4"; Showresult.settext (content); Break;case r.id.five:content = Showresult.gettext (). toString () + "5"; Showresult.settext (content); Break;case r.id.six:content = Showresult.gettext (). toString () + "6"; Showresult.settext (content); Break;case r.id.seven:content = Showresult.gettext (). toString () + "7"; Showresult.settext (content); Break;case r.id.eight:content = Showresult.gettext (). toString () + "8"; Showresult.settext (content); Break;case r.id.nine:content = Showresult.gettext (). toString () + "9";Showresult.settext (content); Break;case r.id.zero:content = Showresult.gettext (). toString () + "0"; Showresult.settext (content); Break;case r.id.point:content = Showresult.gettext (). toString () + "."; Showresult.settext (content), break;//+-*/case r.id.add:string addstring = Showresult.gettext (). toString (); if ( Addstring.equals ("")) {return;} NUM1 = double.valueof (addstring); op = 1; Showresult.settext (""); break;case r.id.subtract:string subString = Showresult.gettext (). toString (); if ( Substring.equals ("")) {return;} NUM1 = double.valueof (subString); op = 2; Showresult.settext (""); break;case r.id.multiply:string mulstring = Showresult.gettext (). toString (); if ( Mulstring.equals ("")) {return;} NUM1 = double.valueof (mulstring); op = 3; Showresult.settext (""); break;case r.id.divide:string divstring = Showresult.gettext (). toString (); if ( Divstring.equals ("")) {return;} NUM1 = double.valueof (divstring); op = 4; Showresult.settext (""); break;//cleancase R.id.clean:showresult.settext (""); break;//=case R.id.result:STring resultstring = Showresult.gettext (). toString (); if (Resultstring.equals ("")) {return;} num2 = double.valueof (resultstring); switch (OP) {case 0:num = num2;break;case 1:num = num1 + num2;break;case 2:num = Num1 -Num2;break;case 3:num = num1 * Num2;break;case 4:num = num1/num2;break;default:break;} Showresult.settext (num + ""); break;default:break;}}}

Android---9---simple calculator