1.简单介绍
RadioGroup可以提供几个选项供用户选择,但只能选择其中的一个。其下面可以横着或者竖着挂几个RadioButton,也可以挂载其他控件(如TextView)。RadioGroup的相应事件一般不由下面的RadioButton响应,而是直接由RadioGroup响应。实现RadioGroup.OnCheckedChangeListener接口即可监听RadioGroup。RadioButton也是派生自CompoundButton,也可以通过修改button属性来修改图标,但是通过button属性修改往往会使文字和图标挨得很近。这时候我们可以设置RadioButton的drawableLeft属性和drawablePadding属性来使图标和文字挨得远一点(同时把button属性设置成@null)。下图是RadioGroup的使用效果。![RadioGroup](https://img-blog.csdnimg.cn/20190808143928702.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzIxOTYxNQ==,size_16,color_FFFFFF,t_70)
2.简单使用
下面是RadioGroup的简单实现代码。
radio_group_selector.xml
activity_radio_group.xml
RadioGroupActivity.java
package xyz.strasae.androidlearn.my;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
public class RadioGroupActivity extends AppCompatActivity {
RadioGroup rg_horizontal_demo;
RadioGroup rg_vertical_demo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_radio_group);
rg_horizontal_demo = findViewById(R.id.rg_horizontal_demo);
rg_vertical_demo = findViewById(R.id.rg_vertical_demo);
rg_horizontal_demo.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
RadioButton rb_temp = findViewById(radioGroup.getCheckedRadioButtonId());
Toast.makeText(RadioGroupActivity.this, String.format("你选择了%s", rb_temp.getText().toString()), Toast.LENGTH_SHORT).show();
}
});
rg_vertical_demo.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
RadioButton rb_temp = findViewById(radioGroup.getCheckedRadioButtonId());
Toast.makeText(RadioGroupActivity.this, String.format("你选择了%s", rb_temp.getText().toString()), Toast.LENGTH_SHORT).show();
}
});
}
}
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