[android] 03_常见控件1-单选按钮(RadioGroup、RadioButton)

Android 4.0

常见控件1-单选按钮(RadioGroup、RadioButton)

单选框(RadioButton)要完成单选框显示,我们需要使用到RadioGroup和RadioButton(单选框),RadioGroup用于对单选框进行分组,相同组内的单选框只有一个单选框能被选中。

lRadioGroup.check(R.id.dotNet);id名为dotNet的单选框设置成选中状态。
l(RadioButton) findViewById(radioGroup.getCheckedRadioButtonId());//获取被选中的单选框。
lRadioButton.getText();//获取单选框的值
l调用setOnCheckedChangeListener()方法,处理单选框被选择事件,把RadioGroup.OnCheckedChangeListener实例作为参数传入
1、布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="男" />
        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女" />
        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="人妖" />
    </RadioGroup>
</LinearLayout>
2、代码:
package cn.zengfansheng.commonui;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;
 
public class MainActivity extends Activity {
 
    private RadioGroup rg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        rg = (RadioGroup) this.findViewById(R.id.rg);
        // int checkedRadioButtonId = rg.getCheckedRadioButtonId();//获取选中的控件的id
        rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                Toast.makeText(getApplicationContext(), "您选择了:"+checkedId, 0).show();
            }
        });
    }
}
3、结果: