第八节--控件（一）RadioGroup,RadioButton,CheckBox,Toast

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#radiobutton #android #layout #button #教育 #class

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本文详细介绍了Android开发中常用的UI控件，包括RadioGroup、RadioButton、CheckBox和Toast等。通过实例代码展示了如何使用这些控件及其实现的效果。

RadioGroup:

java.lang.Object
↳	android.view.View
	↳	android.view.ViewGroup
		↳	android.widget.LinearLayout
			↳	android.widget.RadioGroup

RadioButton：

java.lang.Object
↳	android.view.View
	↳	android.widget.TextView
		↳	android.widget.Button
			↳	android.widget.CompoundButton
				↳	android.widget.RadioButton

原意：

A radio button is a two-states button that can be either checked or unchecked. When the radio button is unchecked, the user can press or click it to check it.

译文：

单选按钮是两种状态的按钮，可以是选中或不选中状态。当单选按钮未被选中，用户可以按下或点击它来选中它。

CheckBox：

java.lang.Object
↳	android.view.View
	↳	android.widget.TextView
		↳	android.widget.Button
			↳	android.widget.CompoundButton
				↳	android.widget.CheckBox

原意：

A checkbox is a specific type of two-states button that can be either checked or unchecked

译文：

一个checkbox是一个指定的两种状态类型的按钮，它要么被选中要么不被选中。

Toast：

java.lang.Object
↳	android.widget.Toast

原意：

A toast is a view containing a quick little message for the user. The toast class helps you create and show those.

译文：

一个Toast是一个快速显示一小段信息给用户的视图。toast类可以帮组我们创建和显示这些信息。

代码示例：

java代码： public class RadioTest extends Activity { //对控件对象进行声明 private RadioGroup firstGroup = null; private RadioGroup secondGroup = null; private RadioButton femaleButton = null; private RadioButton maleButton = null; private RadioButton sunzoneButton = null; private RadioButton pro360Button = null; private CheckBox swimBox = null; private CheckBox runBox = null; private CheckBox readBox = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.radio); //通过调用findViewById方法，获取对应Id控件的对象 firstGroup = (RadioGroup)findViewById(R.id.firstGroup); secondGroup = (RadioGroup)findViewById(R.id.secondGroup); femaleButton = (RadioButton)findViewById(R.id.femaleButton); maleButton = (RadioButton)findViewById(R.id.maleButton); sunzoneButton=(RadioButton)findViewById(R.id.sunzoneButton); pro360Button=(RadioButton)findViewById(R.id.edu360Button); swimBox = (CheckBox)findViewById(R.id.swim); runBox = (CheckBox)findViewById(R.id.run); readBox = (CheckBox)findViewById(R.id.read); //为RadioGroup设置监听器 firstGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if(femaleButton.getId() == checkedId){ Toast.makeText(RadioTest.this, "famle", Toast.LENGTH_SHORT).show(); } else if(maleButton.getId() == checkedId) { System.out.println("male"); Toast.makeText(RadioTest.this, "male", Toast.LENGTH_SHORT).show(); } } }); secondGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if(sunzoneButton.getId()==checkedId){ Toast.makeText(RadioTest.this, "森纵教育", Toast.LENGTH_LONG).show(); }else if(pro360Button.getId()==checkedId){ Toast.makeText(RadioTest.this, "职业教育360", Toast.LENGTH_SHORT).show(); } } }); //为多选按钮添加监听器 swimBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(isChecked) { Toast.makeText(RadioTest.this, "你选择了swim", Toast.LENGTH_SHORT).show(); System.out.println("swim is checked"); } else { System.out.println("swim is unchecked"); Toast.makeText(RadioTest.this, "你取消了swim", Toast.LENGTH_SHORT).show(); } } }); runBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(isChecked) { Toast.makeText(RadioTest.this, "你选择了run", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(RadioTest.this, "你取消了run", Toast.LENGTH_SHORT).show(); } } }); readBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(isChecked) { System.out.println("read is checked"); Toast.makeText(RadioTest.this, "你选择了read", Toast.LENGTH_SHORT).show(); } else { System.out.println("read is unchecked"); Toast.makeText(RadioTest.this, "你取消了read", Toast.LENGTH_SHORT).show(); } } }); } }

布局文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
	android:id="@+id/textView1"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="控件Test"
    />
<RadioGroup
	android:id="@+id/firstGroup"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical"
    >
    <RadioButton
    	android:id="@+id/femaleButton"
 	    android:layout_width="wrap_content" 
  	    android:layout_height="wrap_content" 
  	    android:text="@string/female"
  	   
  	    />
    <RadioButton
    	android:id="@+id/maleButton"
 	    android:layout_width="wrap_content" 
  	    android:layout_height="wrap_content" 
  	    android:text="@string/male"
  	    />
</RadioGroup>
<TextView android:layout_width="100px"
    android:layout_height="2dp"
    android:background="#00ddcc"
    />
<RadioGroup
	android:id="@+id/secondGroup"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical"
    >
    <RadioButton
    	android:id="@+id/sunzoneButton"
 	    android:layout_width="wrap_content" 
  	    android:layout_height="wrap_content" 
  	    android:text="森纵教育"
  	    />
    <RadioButton
    	android:id="@+id/edu360Button"
 	    android:layout_width="wrap_content" 
  	    android:layout_height="wrap_content" 
  	    android:text="职业教育"
  	    />
</RadioGroup>
<TextView android:layout_width="fill_parent"
    android:layout_height="2dp"
    android:background="#00ddcc"
    />
<CheckBox
	android:id="@+id/swim"
 	android:layout_width="wrap_content" 
  	android:layout_height="wrap_content" 
  	android:text="@string/swim"
  	/>
<CheckBox
	android:id="@+id/run"
 	android:layout_width="wrap_content" 
  	android:layout_height="wrap_content" 
  	android:text="@string/run"
  	/>
<CheckBox
	android:id="@+id/read"
 	android:layout_width="wrap_content" 
  	android:layout_height="wrap_content" 
  	android:text="@string/read"
  	/>
  	<TextView android:layout_width="fill_parent"
    android:layout_height="2dp"
    android:background="#00ddcc"
    />
</LinearLayout>

演示效果：

原意：

This class is used to create a multiple-exclusion scope for a set of radio buttons. Checking one radio button that belongs to a radio group unchecks any previously checked radio button within the same group.

Intially, all of the radio buttons are unchecked. While it is not possible to uncheck a particular radio button, the radio group can be cleared to remove the checked state.
译文：

这个类是用来创建具有相互排斥的一个可选择radio按钮。在同一组内，选择其中一个按钮就预示着要取消另一个按钮的选择。
最初，单选按钮都是未选中。如果一个radio组被移除和取消，是不可能去选择一个radio按钮的。