UI组件之TextView及其子类(二)RadioButton和CheckBox
最后更新于:2022-04-01 16:13:46
单选按钮(RadioButton)和复选框(CheckBox),状态开关按钮(ToggleButton),开关(Switch)都是普通的UI组件,都继承了Button类,因此都可以用Button的各种属性和方法。
**RadioButton通常要与RadioGroup一起使用,用于定义一组单选按钮**
对于二者而言,最主要的还是要看他们的监听器,RadioButton的事件监听器是:
**单选按钮的监听接口是OnCheckedChangeListener**
~~~
radiobutton.setOnCheckedChangeListener(new OnCheckedChangeListener(){
//单选框的监听器,OnCheckedChangeListener是单选框的监听接口,为radiogroup组建的Oncheck事件绑定监听器
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
//处理操作
}
});
~~~
而复选框CheckBox的监听器是:**注意复选框的监听接口是CompoundButton.OnCheckedChangeListener**
~~~
//复选框的监听器,CompoundButton.OnCheckedChangeListener是复选框的监听接口
checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
//处理操作
}
});
~~~
例:
main.xml
~~~
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="性 别:"
android:textSize="23dp" />
<!-- RadioButton需要在RadioGroup组件里面 -->
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/radio0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="男"
android:textSize="23dp" />
<RadioButton
android:id="@+id/radio1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:textSize="23dp" />
</RadioGroup>
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="喜欢的颜色:"
android:textSize="23dp" />
<!-- 线性布局组件中有三个复选框 -->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="红色"
android:textSize="23dp"/>
<CheckBox
android:id="@+id/checkBox2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="蓝色"
android:textSize="23dp"/>
<CheckBox
android:id="@+id/checkBox3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="绿色"
android:textSize="23dp"/>
</LinearLayout>
</TableRow>
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="23dp" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp" />
</TableLayout>
~~~
MainActivity.java
~~~
package com.hust.radiocheckbuttontest;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
public class MainActivity extends Activity {
String str=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//从布局文件中获取radiogroup组件和textview组件
RadioGroup rg=(RadioGroup) findViewById(R.id.radioGroup1);
final TextView showradio=(TextView) findViewById(R.id.textView3);
final TextView showcheck=(TextView) findViewById(R.id.textView4);
//获取复选框组件
final CheckBox red=(CheckBox) findViewById(R.id.checkBox1);
final CheckBox blue=(CheckBox) findViewById(R.id.checkBox2);
final CheckBox green=(CheckBox) findViewById(R.id.checkBox3);
//str.append("喜欢的颜色是:");
//单选框的监听器,OnCheckedChangeListener是单选框的监听接口,为radiogroup组建的Oncheck事件绑定监听器
rg.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
//根据备选按钮的Id改变s的值
String s=checkedId==R.id.radio0?"您的性别是男人":"您的性别是女人";
//文本框显示文本
showradio.setText(s);
}
});
//复选框的监听器,CompoundButton.OnCheckedChangeListener是复选框的监听接口
red.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked){
str=(String) red.getText();
showcheck.setText(str);
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
~~~
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