best android graphing calculator

 Introduction to Android GridLayout, Calculator for exampleAndroid GridLayout Default horizontal layout element from left to right. You can control whether the orientation of the child element layout is horizontal or vertical by setting the property: Android:orientation=.The GridLayout properties Android:layout_row and Android:layout_column set constant values to specify the number of rows that the GridLa

;Android:id= "@+id/button_yi"Android:layout_width= "80DP"android:layout_height= "70DP"android:text= "@string/yi"Android:textsize= "30sp"/>Android:id= "@+id/button_er"Android:layout_width= "80DP"android:layout_height= "70DP"android:text= "@string/er"Android:textsize= "30sp"/>Android:id= "@+id/button_san"Android:layout_width= "80DP"android:layout_height= "70DP"android:text= "@string/san"Android:textsize= "30sp"/>Android:id= "@+id/button_dian"Android:layout_width= "80DP"android:layout_height= "70DP

| | str.equals (")") return; if (!str.contains ("+") !str.contains ("-") !str.contains ("X") !str.contains ("+")) re Turn Traverse computed result double result = 0; Char a =str.charat (Str.length ()-2); if (A = = ' + ' | | a = = '-') {str = str + ' 0 '; } else if (a = = ' X ' | | a = = ' ÷ ') {str = str + ' 1 '; } int i = 0; int start = 0; char temp = '; int flag = 1; if (!str.contains ("+") !str.contains ("-")) {result + =

/number2 + ""); fuhao. settext ("/") ;}}}}@ overridepublic Boolean oncreateoptionsmenu (menu) {super. oncreateoptionsmenu (menu); // create a menu, set the icon, and use the icon provided by the system, menu. add (0, R. id. about, 0, "about "). seticon (Android. r. drawable. ic_dialog_info); menu. add (0, R. id. quit, 1, "quit "). seticon (Android. r. drawable. ic_lock_power_off); menu. finditem (R. id. qui

"android:layout_height= "Fill_parent"android:onclick= "Onclicklistener"android:text= "@string/negsign"/gt; Android:id= "@+id/buttonplus"Android:layout_width= "0DP"android:layout_height= "Fill_parent"android:layout_weight= "1"android:onclick= "Onclicklistener"android:text= "@string/plus"/> android:layout_width= "0DP" android:layout_height= "Fill_parent" android:layout_weight= "1" android:orientation= "Vertical" android:id= "@+id/buttonminus" android:layout_width= "Fill _pare

After about four nights of study, finally made a small thing, from the small white slowly learned something:1. Nesting use of layoutsUse of 2.EditText, button, and other attributes3. Need to declare before use, and then instantiate, the button needs to set the Click event4. Use the OnClick function to set the function of the click button5. Internationalization to put the kanji into the string.xml, from which to callLayout Code main functionSet the background color add android:theme= "@

(Edittext.gettext (). toString ()));//Save the value of the display area and calculate}Save the operator you clicked onLastcommand = Inputcommand;Clearflag = true;//Because I've already entered the operator here,}}}Method of calculationprivate void Calculate (Double x) {if (lastcommand.equals ("+")) {result + = x;} else if (Lastcommand.equals ("-")) {Result-= x;} else if (Lastcommand.equals ("*")) {Result *= x;} else if (Lastcommand.equals ("/")) {Result/= x;} else if (lastcommand.equals ("="))

2017.4.1Today the layout interface is basically complete and now writes a bit of event binding. The plan is to use dynamic bindings and change them at any time. About the layout, yesterday to get very late, because the layout of the use of errors, with the own, not carefully read, preview without problems, but the real machine debugging error. is a compatibility issue, many Android systems do not support Constrainlayout (6.0 does not support do not as

Reprint Please specify source: http://blog.csdn.net/qq_32059827/article/details/51707931From today onwards, this column continues to update the Android Simple Combat blog post. Unlike previous columns, this column has only instances. Each instance as far as possible according to the knowledge points corresponding to the content of the corresponding chapter to write, step-by. Some instances may have duplicate articles with another column.The first simp

())-Float.parsefloat (Medittext1.gettext ( ). ToString ()); } if (operation== "*") {temp=float.parsefloat (Medittext.gettext (). toString ()) * Float.parsefloat (Medittext1.gettext ( ). ToString ()); } if (operation== "/") {Temp=float.parsefloat (Medittext.gettext (). toString ())/Float.parsefloat (Medittext1.gettext ( ). ToString ()); } experssion=medittext.gettext (). ToString () +operation+medittext1.gettext (). ToString () + "=" +temp.tostring (); return experssion; The public void Confirm

Lab questions: Complete a simple computer function in the android simulator. Purpose: Learn how to use common android controls such as text boxes and buttons. Step 1: Create a project Select the SDK version. For example, select 2.3.3. So far, the project has been created. The android project has created a main. XML interface by default. Double-click to

In fact, this Android computer, all the backstage ideas and "C # calculator Code" is exactly the same. The Win form program is ported to Android, from C # to Java in fact, because the basic syntax is very similar, the only difficulty is the Android XML layout part, unlike C # forms can be directly dragged.Or a

Lab questions:Complete a simple computer function in the Android simulator.Purpose:Learn how to use common Android controls such as text boxes and buttons.Step 1: Create a projectSelect the SDK version. For example, select 2.3.3.So far, the project has been created.The Android project has created a main. xml interface by default.Double-click to open the interface

The Android 4.4.4 Calculator Calculator is ported and can be used independently in Android studio. The complete code has been pushed to my GitHub, linked at the end of the article.Here's a look at:This is the effect on the Samsung phone, and the same as the calculator UI I u

;} // declare the variable calculation result $ sum =" "; if ($ isDo) {// determine whether two operators are numbers. if they are not numbers, do not switch ($ _ POST ['ysf ']) {case' + ': $ sum = $ _ POST ['num1'] + $ _ POST ['num2']; break; case '-': $ sum = $ _ POST ['num1']-$ _ POST ['num2']; break; case '*': $ sum = $ _ POST ['num1'] * $ _ POST ['num2']; break; case '/': $ sum = $ _ POST ['num1']/$ _ POST ['num2']; break; case '% ': $ sum = $ _ POST ['num1'] % $ _ POST ['num2']; break;} ec

Android Studio 2.3.2. Reference article: http://blog.csdn.net/like_program/article/details/518136321. New Project Mycalculator, all the way next, the default values are used.2. Modify the contents of the three XML files as required. Many local engineering names are different and changed to their own names.3. Follow the steps to modify the Activity_main. XML file, encountered a problem:Android:singleline= "false" obsoleteTemporary handling: Delete this

) {Super. OnCreate (savedinstancestate); Setcontentview (R.layout.activity_result); TextView Tv_name=(TextView) Findviewbyid (r.id.tv_name); TextView Tv_sex=(TextView) Findviewbyid (r.id.tv_sex); TextView Tv_result=(TextView) Findviewbyid (R.id.tv_result); Intent Intent=getintent (); String name= Intent.getstringextra ("name"); byte[] bytes =name.getbytes (); intSex = Intent.getintextra ("Sex", 0); Tv_name.settext (name); Switch(Sex) { Case1: Tv_sex.settext (Male); Try{bytes= Name.

Introduction: After learning several android layout methods, we made an android calculator. I searched the internet for this information and found that there was a problem with the layout, not full of the screen, but only accounted for a part. The instructor's suggestion is: Setting the font size is the key. However, after I fixed the font size problem and sol

Algorithm used: expression evaluation (infix expression to suffix expression, suffix expression evaluation value)Not how to design the interface, there is time to beautify!Mainactivity.javaPackage Com.example.calculator;import Java.util.hashmap;import Java.util.linkedlist;import java.util.List;import Java.util.map;import Android.app.activity;import Android.os.bundle;import Android.view.menu;import Android.view.view;import Android.widget.button;import Android.widget.textview;import Android.widget

1.activity_main.xml File Layout　　2.mainfest.xml settingsThe writing of 3.color.xml4.drawable Create White_bg.xml as EditText white background　　①②③④Android Calculator maker 1. Layout