Android学习笔记之RadioButton(RadioGroup)
RadioButton(单选按钮)在Androi发中应用的非常广泛,比如一些选择项的时候,会用到单选按钮。它是一种单个圆形单选框双状态的按钮,可以选择或不选择。在RadioButton没有被选中时,用户能够按下或点击来选中它。但是,与复选框相反,用户一旦选中就不能够取消选中。实现RadioButton由两部分组成,也就是RadioButton和RadioGroup配合使用.RadioGroup是单选组合框,可以容纳多个RadioButton的容器.在没有RadioGroup的情况下,RadioButton可以全部都选中;当多个RadioButton被RadioGroup包含的情况下,RadioButton只可以选择一个。并用setOnCheckedChangeListener来对单选按钮进行监听
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/易做图"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/易做图" />
<RadioGroup
android:id="@+id/radiogroup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/female"
android:text="@string/female"
></RadioButton>
<RadioButton
android:id="@+id/male"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/male"
android:checked="true"
></RadioButton>
</RadioGroup>
</LinearLayout>
RadioGroupActivity.java
通过控件的ID来得到代表控件的对象
然后为RadioGroup设置易做图
package Android.Activity;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
public class RadioGroupActivity extends Activity {
/** Called when the activity is first created. */
private RadioButton maleButton = null;
private RadioButton femaleButton = null;
private RadioGroup radiogroup =null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//通过控件的ID来得到代表控件的对象
maleButton = (RadioButton)findViewById(R.id.male);
femaleButton = (RadioButton)findViewById(R.id.female);
radiogroup = (RadioGroup)findViewById(R.id.radiogroup);
//为RadioGroup设置易做图,需要注意的是,这里的易做图和Button控件的易做图有所不同
radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if(femaleButton.getId() == checkedId){
Toast.makeText(RadioGroupActivity.this, "female", Toast.LENGTH_SHORT).show();
}
else if(maleButton.getId() == checkedId){
Toast.makeText(RadioGroupActivity.this, "male", Toast.LENGTH_SHORT).show();
}
}
});
}
}
摘自 落日小屋
补充:移动开发 , Android ,