RadioButton與CheckBox的區別

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RadioButton，又稱單選框，與RadioGroup配合使用；顧名思義，對於同一組的單選框，在某一時間點只能有一個單選框被選上。

CheckBox，又稱複選框，顧名思義，支持多個複選框同時被選中。

當爲此兩個組件設置監聽器時，兩者之間有個比較大的區別：對於單選框，同一個組內只需要實現一個監聽器RadioGroup.OnCheckedChangeListener；對於複選框，需要爲每個選項設置監聽器CompoundButton.OnCheckedChangeListener。

複選框相關代碼：

CheckBoxTest.java

package com.dvdvstudio.android; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.TextView; import android.widget.CompoundButton.OnCheckedChangeListener; public class CheckBoxTest extends Activity implements OnCheckedChangeListener{ public static final String TAG = "CheckBoxTest"; private CheckBox mCheckBox1; private CheckBox mCheckBox2; private CheckBox mCheckBox3; private TextView mResult; private Integer[] mArray = new Integer[]{0,0,0}; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mCheckBox1 = (CheckBox)findViewById(R.id.checkBox1); mCheckBox2 = (CheckBox)findViewById(R.id.checkBox2); mCheckBox3 = (CheckBox)findViewById(R.id.checkBox3); mResult = (TextView)findViewById(R.id.result); mCheckBox1.setOnCheckedChangeListener(this); mCheckBox2.setOnCheckedChangeListener(this); mCheckBox3.setOnCheckedChangeListener(this); } @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub Log.i(TAG, "buttonView.id = " + buttonView .getId()); String result =""; switch(buttonView.getId()) { case R.id.checkBox1: if(mCheckBox1.isChecked()) { mArray[0] = 1; } else { mArray[0] = 0; } break; case R.id.checkBox2: if(mCheckBox2.isChecked()) { mArray[1] = 1; } else { mArray[1] = 0; } break; case R.id.checkBox3: if(mCheckBox3.isChecked()) { mArray[2] = 1; } else { mArray[2] = 0; } break; } if(mArray[0] + mArray[1] + mArray[2] == 0) { mResult.setVisibility(View.GONE); } else { result = "" + getText(R.string.result); if(mArray[0] != 0) { result = result + " " + mCheckBox1.getText(); } if(mArray[1] != 0) { result = result + " " + mCheckBox2.getText(); } if(mArray[2] != 0) { result = result + " " + mCheckBox3.getText(); } mResult.setVisibility(View.VISIBLE); mResult.setText(result); } } } 

main.xml

<?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:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/sport" /> <CheckBox android:id="@+id/checkBox1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:checked="false" android:text="@string/football" > </CheckBox> <CheckBox android:id="@+id/checkBox2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:checked="false" android:text="@string/basketball" > </CheckBox> <CheckBox android:id="@+id/checkBox3" android:layout_width="fill_parent" android:layout_height="wrap_content" android:checked="false" android:text="@string/swimming" > </CheckBox> <TextView android:id="@+id/result" android:layout_width="fill_parent" android:layout_height="wrap_content" android:visibility="gone" ></TextView> </LinearLayout>  

strings.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello World, CheckBoxTest!</string> <string name="app_name">CheckBoxTest</string> <string name="sport">"喜歡哪些運動？ "</string> <string name="football">"足球"</string> <string name="basketball">"籃球"</string> <string name="swimming">"游泳"</string> <string name="result">"你選擇的是："</string> </resources>  

 

單選框相關：

RadioGroupTest.java

package com.dvdvstudio.android; import android.app.Activity; import android.os.Bundle; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.TextView; import android.widget.RadioGroup.OnCheckedChangeListener; public class RadioGroupTest extends Activity implements OnCheckedChangeListener{ /** Called when the activity is first created. */ private TextView mTextView; private RadioGroup mRadioGroup; private RadioButton mButton1; private RadioButton mButton2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextView = (TextView)findViewById(R.id.text); mRadioGroup = (RadioGroup)findViewById(R.id.radioGroup); mButton1 = (RadioButton)findViewById(R.id.button1); mButton2 = (RadioButton)findViewById(R.id.button2); mRadioGroup.setOnCheckedChangeListener(this); } @Override public void onCheckedChanged(RadioGroup group, int checkedId) { // TODO Auto-generated method stub if(checkedId == mButton1.getId()) { mTextView.setText(R.string.resultForBOBOSTUDIO); } if(checkedId == mButton2.getId()) { mTextView.setText(R.string.resultForDVDVSTUDIO); } } } 

main.xml

<?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/text" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/resultForBOBOSTUDIO" > </TextView> <RadioGroup android:id="@+id/radioGroup" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <RadioButton android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/item1" android:checked="true" > </RadioButton> <RadioButton android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/item2" > </RadioButton> </RadioGroup> </LinearLayout>  

strings.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello World, RadioGroupTest!</string> <string name="app_name">RadioGroupTest</string> <string name="item1">BOBOSTUDIO</string> <string name="item2">DVDVSTUDIO</string> <string name="resultForBOBOSTUDIO">BOBOSTUDIO is selected!</string> <string name="resultForDVDVSTUDIO">DVDVSTUDIO is selected!</string> </resources>  

 

 

2010-12-28