RadioButton

1. Radio buttons are normally used together in a RadioGroup
2. 在RadioGroup中添加RadioButton（至少两个）
3. 为对象添加监听器，实现OnCheckedChangeListener接口，（选择RadioGroup包下的那个）

XML 配置

<RadioGroup
        android:id="@+id/rg_sex"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@+id/rb_Male"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="男" />

        <RadioButton
            android:id="@+id/rb_FeMale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女" />
    </RadioGroup>

JAVA 使用

• public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener

    private RadioGroup rg;
    private RadioButton rg_Male, rg_Female;

     rg = (RadioGroup) findViewById(R.id.rg_sex);
        rg_Male = (RadioButton) findViewById(R.id.rb_Male);
        rg_Female = (RadioButton) findViewById(R.id.rb_FeMale);
        rg.setOnCheckedChangeListener(this); //绑定事件

 @Override
    public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
        switch (checkedId) {
            case R.id.rb_FeMale:
                // 当用户选择女性时
                Log.e("chao", "onCheckedChanged: ");
                Toast.makeText(this,"当前用户选择 "+ rg_Female.getText().toString(),Toast.LENGTH_SHORT).show();

                break;
            case R.id.rb_Male:
                // 当用户选择男性时
                Toast.makeText(this,"当前用户选择" +rg_Male.getText().toString(),Toast.LENGTH_SHORT).show();
                break;
        }
    }