Android Studio实现简易计算器源码
本文实例为大家分享了android studio实现简易计算器的具体代码,供大家参考,具体内容如下
效果图:
源码:
布局样式:
<?xml version="1.0" encoding="utf-8"?> <gridlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:baselinealigned="false" android:background="@color/grey" android:columncount="4" android:rowcount="6"> <textview android:id="@+id/textview_01" android:layout_columnspan="4" android:layout_gravity="fill" android:gravity="right" android:layout_marginleft="5dp" android:layout_marginright="5dp" android:background="@color/grey" android:paddingright="20dp" android:paddingtop="40dp" android:text="0" android:layout_columnweight="1" android:textsize="88sp"> </textview> <button android:id="@+id/button_return" android:layout_columnspan="2" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="2dp" android:background="@color/white" android:textsize="30dp" android:textstyle="bold" android:text="回退" /> <button android:id="@+id/button_clear" android:layout_columnspan="2" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="2dp" android:background="@color/white" android:textsize="30dp" android:textstyle="bold" android:text="清空"/> <button android:id="@+id/button_add" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="+"/> <button android:id="@+id/button_01" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="1"/> <button android:id="@+id/button_02" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="2"/> <button android:id="@+id/button_03" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="3"/> <button android:id="@+id/button_reduce" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="-"/> <button android:id="@+id/button_04" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="4"/> <button android:id="@+id/button_05" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="5"/> <button android:id="@+id/button_06" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="6"/> <button android:id="@+id/button_ride" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="*"/> <button android:id="@+id/button_07" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="7"/> <button android:id="@+id/button_08" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="8"/> <button android:id="@+id/button_09" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="9"/> <button android:id="@+id/button_except" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="/"/> <button android:id="@+id/button_spot" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="."/> <button android:id="@+id/button_00" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="0"/> <button android:id="@+id/button_equal" android:layout_columnspan="1" android:gravity="center" android:layout_columnweight="1" android:layout_rowweight="1" android:layout_margin="1dp" android:background="@color/white" android:textsize="50dp" android:text="="/> </gridlayout>
java部分源码:
package com.example.pyfcalculator; import androidx.appcompat.app.appcompatactivity; import android.os.bundle; import android.text.textutils; import android.view.view; import android.widget.button; import android.widget.textview; public class mainactivity extends appcompatactivity implements view.onclicklistener { textview textview; button button_return,button_00,button_01,button_02,button_03, button_04,button_05,button_06,button_07,button_08,button_09,button_add, button_clear,button_equal,button_except,button_reduce,button_ride,button_spot; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); initviewandlistener(); } //注册监听方法 protected void initviewandlistener(){ button_return=findviewbyid(r.id.button_return); button_00=findviewbyid(r.id.button_00); button_01=findviewbyid(r.id.button_01); button_02=findviewbyid(r.id.button_02); button_03=findviewbyid(r.id.button_03); button_04=findviewbyid(r.id.button_04); button_05=findviewbyid(r.id.button_05); button_06=findviewbyid(r.id.button_06); button_07=findviewbyid(r.id.button_07); button_08=findviewbyid(r.id.button_08); button_09=findviewbyid(r.id.button_09); button_add=findviewbyid(r.id.button_add); button_clear=findviewbyid(r.id.button_clear); button_equal=findviewbyid(r.id.button_equal); button_except=findviewbyid(r.id.button_except); button_reduce=findviewbyid(r.id.button_reduce); button_ride=findviewbyid(r.id.button_ride); button_spot=findviewbyid(r.id.button_spot); button_return.setonclicklistener(this); button_00.setonclicklistener(this); button_01.setonclicklistener(this); button_02.setonclicklistener(this); button_03.setonclicklistener(this); button_04.setonclicklistener(this); button_05.setonclicklistener(this); button_06.setonclicklistener(this); button_07.setonclicklistener(this); button_08.setonclicklistener(this); button_09.setonclicklistener(this); button_add.setonclicklistener(this); button_clear.setonclicklistener(this); button_equal.setonclicklistener(this); button_except.setonclicklistener(this); button_reduce.setonclicklistener(this); button_ride.setonclicklistener(this); button_spot.setonclicklistener(this); textview=findviewbyid(r.id.textview_01); } private string num_in_now;//记录当前结果 private boolean flag=false;//记录计算器状态 int now_num=0; @override public void onclick(view view) { //获取文本框内容 string currenttext=textview.gettext().tostring(); switch (view.getid()){ case r.id.button_00: if ((textview.gettext().tostring().equals("0"))) return; isflag("0"); break; case r.id.button_01: isflag("1"); break; case r.id.button_02: isflag("2"); break; case r.id.button_03: isflag("3"); break; case r.id.button_04: isflag("4"); break; case r.id.button_05: isflag("5"); break; case r.id.button_06: isflag("6"); break; case r.id.button_07: isflag("7"); break; case r.id.button_08: isflag("8"); break; case r.id.button_09: isflag("9"); break; case r.id.button_add: // textview.settext(textview.gettext()+"+"); now_num++; if(now_num>1){ equal(); } isflag("+"); break; case r.id.button_except: // textview.settext(textview.gettext()+"/"); now_num++; if(now_num>1){ equal(); } isflag("/"); break; case r.id.button_spot: // textview.settext(textview.gettext()+"."); isflag("."); break; case r.id.button_reduce: // textview.settext(textview.gettext()+"-"); now_num++; if(now_num>1){ equal(); } isflag("-"); break; case r.id.button_ride: // textview.settext(textview.gettext()+"*"); now_num++; if(now_num>1){ equal(); } isflag("*"); break; case r.id.button_clear: textview.settext("0"); flag=false; now_num=0; break; case r.id.button_return: if(textutils.isempty(textview.gettext())){ return; } if (currenttext.substring(0,currenttext.length()-1).length()>0){ textview.settext(currenttext.substring(0,currenttext.length()-1)); } else{ textview.settext("0"); flag=false; now_num=0; } break; case r.id.button_equal: if(textutils.isempty(textview.gettext())){ return; } equal(); flag=false; now_num=0; break; } } private void equal(){ textview.settext(operation(textview.gettext().tostring())); } //运算方法 private string operation(string string){ int index; double num_1,num_2; if (string.contains("+")){ index=string.indexof("+"); num_1= double.parsedouble(string.substring(0,index)); num_2= double.parsedouble(string.substring(index+1,string.length())); return num_1+num_2+""; } if (string.contains("-")){ index=string.indexof("-"); if(index==0){ string string_2=string.substring(1,string.length()); int index_2=string_2.indexof("-"); num_1= double.parsedouble(string_2.substring(0,index_2)); num_2= double.parsedouble(string_2.substring(index_2+1,string_2.length())); return (-(num_1+num_2))+""; }else{ num_1= double.parsedouble(string.substring(0,index)); num_2= double.parsedouble(string.substring(index+1,string.length())); return num_1-num_2+""; } } if (string.contains("*")){ index=string.indexof("*"); num_1= double.parsedouble(string.substring(0,index)); num_2= double.parsedouble(string.substring(index+1,string.length())); return num_1*num_2+""; } if (string.contains("/")){ index=string.indexof("/"); num_1= double.parsedouble(string.substring(0,index)); num_2= double.parsedouble(string.substring(index+1,string.length())); return num_1/num_2+""; } return "error!!!"; } //判断0要不要被替换 看flag的状态 输入数字 private void isflag(string info){ if (flag){ textview.settext(textview.gettext()+info); }else{ if(info.equals(".")||info.equals("+")||info.equals("-")||info.equals("*")||info.equals("/")){ textview.settext(textview.gettext()+info); }else { textview.settext(info); } flag=true; } } }
其余资源没有太大难度,就不一展现了!
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