The first step is to create an android project.
The second step is to modify the generated res/layout/main.xml
view plaincopy to clipboardprint?
< ;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
> height="wrap_content"
android:text="checkbox 1 "/& gt; & & lt; checkbox
Android: ID ="@+ID/Checkbox1 "
Android: layout_width =" wrap_content "
Android: layout_height =" wrap_ Content "d Android: text =" check Box 2" />
android:id="@+id/radioGroup" android:orientation="vertical" android:layout_width="fill _parent" android:layout_height="fill_parent "> ; Radiobutton android: ID = "@+ID/randion2" Android: layout_width = "wrap_content" android: layout_heigh_Content " Android: Text = "Tianjin"/& GT; & LT; Radiobutton android: ID = "@+ID/randion3" Android: layout_width = "wrap_content" android: layout_heigh = "wrap_content" Android: text = "Shanghai"/& & lti; obutton android: ID = "@+ID/randion4 " Android: layout_width =" wrap_content "android: layout_height =" wrap_content " Android: text =" Chongqing "/& LT;/Radiogroup & GT; /& Lt;/linearlayout & gt; third step , add the main code view plaincopy to clipboardprint? import android.app.Activity; import android.os.Bundle; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.CompoundButton.OnCheckedChangeListener; ity implements OnCheckedChangeListener { /** Called when the activity is first created. */ RadioButton r1 = null; RadioButton r2 = null; RadioButton r3 = null; RadioButton r4 = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); CheckBox checkBox = (CheckBox) findViewById(R.id.checkBox); CheckBox checkBox1 = (CheckBox) findViewById(R.id.checkBox1); //获得单选按钮组 RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radioGroup); //获得单选按钮 r1 = (RadioButton )findViewById(R.id.radion1); r2 = (RadioButton )findViewById(R.id.radion2); r3 = (RadioButton )findViewById(R.id.radion3); r4 = (RadioButton )findViewById(R.id.radion4); checkBox.setChecked(true); r1.setClickable(true); //监听多选按钮 checkBox.setOnCheckedChangeListener(this); checkBox1.setOnCheckedChangeListener(this); //监听单选按钮 radioGroup.setOnCheckedChangeListener(mChangeRadio); }

C# and .NET runtime work closely together to empower developers to efficient, powerful and cross-platform development capabilities. 1) C# is a type-safe and object-oriented programming language designed to integrate seamlessly with the .NET framework. 2) The .NET runtime manages the execution of C# code, provides garbage collection, type safety and other services, and ensures efficient and cross-platform operation.

To start C#.NET development, you need to: 1. Understand the basic knowledge of C# and the core concepts of the .NET framework; 2. Master the basic concepts of variables, data types, control structures, functions and classes; 3. Learn advanced features of C#, such as LINQ and asynchronous programming; 4. Be familiar with debugging techniques and performance optimization methods for common errors. With these steps, you can gradually penetrate the world of C#.NET and write efficient applications.

The relationship between C# and .NET is inseparable, but they are not the same thing. C# is a programming language, while .NET is a development platform. C# is used to write code, compile into .NET's intermediate language (IL), and executed by the .NET runtime (CLR).

C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.

C# and .NET adapt to the needs of emerging technologies through continuous updates and optimizations. 1) C# 9.0 and .NET5 introduce record type and performance optimization. 2) .NETCore enhances cloud native and containerized support. 3) ASP.NETCore integrates with modern web technologies. 4) ML.NET supports machine learning and artificial intelligence. 5) Asynchronous programming and best practices improve performance.

C#.NETissuitableforenterprise-levelapplicationswithintheMicrosoftecosystemduetoitsstrongtyping,richlibraries,androbustperformance.However,itmaynotbeidealforcross-platformdevelopmentorwhenrawspeediscritical,wherelanguageslikeRustorGomightbepreferable.

The programming process of C# in .NET includes the following steps: 1) writing C# code, 2) compiling into an intermediate language (IL), and 3) executing by the .NET runtime (CLR). The advantages of C# in .NET are its modern syntax, powerful type system and tight integration with the .NET framework, suitable for various development scenarios from desktop applications to web services.


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