本文实例为大家分享了Android Studio实现长方体、表面积计算器的具体代码,供大家参考,具体内容如下
写了两个方法(在我理解之中有三个方法,其中循环字符串匹配太low了,pass掉),目前先上传一个,后续补上。
针对这个问题 总共有四个文件
方法一:正则表达式
1.MainActivity.java
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package com.example.flyyu.four; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.Toast; import java.util.regex.Pattern; public class MainActivity extends AppCompatActivity implements View.OnClickListener{ @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public void onClick(View v) { EditText a=(EditText)findViewById(R.id.editText); EditText b=(EditText)findViewById(R.id.editText2); EditText c=(EditText)findViewById(R.id.editText3); Intent it= new Intent( this ,biapmianji. class ); if (!isNumber(a.getText().toString())&&!isNumber(b.getText().toString())&&!isNumber(c.getText().toString())){ it.putExtra( "a" ,a.getText().toString()); it.putExtra( "b" ,b.getText().toString()); it.putExtra( "c" ,c.getText().toString()); MainActivity. this .startActivity(it); } } public boolean isNumber(String s){ String pattern = ".*\\D.*" ; boolean isMatch = Pattern.matches(pattern,s); if (isMatch||s.length()== 0 ){ Toast.makeText( this , "输入异常" ,Toast.LENGTH_SHORT).show(); return true ; } return isMatch; } } |
2.biapmianji.java
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package com.example.flyyu.four; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.TextView; public class biapmianji extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_biapmianji); TextView textView=(TextView)findViewById(R.id.textView4); Intent it= this .getIntent(); float a=Float.valueOf(it.getStringExtra( "a" )) ; float b=Float.valueOf(it.getStringExtra( "b" )) ; float c=Float.valueOf(it.getStringExtra( "c" )) ; String s=( 2 *(a*b+a*c+b*c))+ "" ; textView.setText( "该长方体的表面积为:" +s); // textView.setText("该长方体的表面积为:"+a); } } |
3.activity_biapmianji.XML
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<? xml version = "1.0" encoding = "utf-8" ?> < android.support.constraint.ConstraintLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = "com.example.flyyu.four.biapmianji" > < TextView android:id = "@+id/textView4" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_marginBottom = "8dp" android:layout_marginLeft = "8dp" android:layout_marginRight = "8dp" android:layout_marginTop = "8dp" android:text = "TextView" android:textSize = "18sp" app:layout_constraintBottom_toBottomOf = "parent" app:layout_constraintHorizontal_bias = "0.174" app:layout_constraintLeft_toLeftOf = "parent" app:layout_constraintRight_toRightOf = "parent" app:layout_constraintTop_toTopOf = "parent" app:layout_constraintVertical_bias = "0.083" /> </ android.support.constraint.ConstraintLayout > |
4.activity_main.XML
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<? xml version = "1.0" encoding = "utf-8" ?> <!--<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"--> < android.widget.LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "vertical" tools:context = "com.example.flyyu.four.MainActivity" > < TextView android:id = "@+id/textView" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:text = "长:" /> < EditText android:id = "@+id/editText" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:ems = "10" android:inputType = "text" /> < TextView android:id = "@+id/textView2" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:text = "宽:" /> < EditText android:id = "@+id/editText2" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:ems = "10" android:inputType = "text" /> < TextView android:id = "@+id/textView3" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:text = "高:" /> < EditText android:id = "@+id/editText3" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:ems = "10" android:inputType = "text" /> < Button android:id = "@+id/button" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_weight = "1" android:onClick = "onClick" android:text = "计算" /> </ android.widget.LinearLayout > |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/vs20s18/article/details/106241775