Android基础知识之控件系列（3）——Button的非直接子类们

这一次，我倾尽所有，换你一世陪伴。

今天要介绍的是Button的非直接子类。先上关系图，后上效果图加代码。

通过上图可以看到Button的直接子类是CompoundButton，这个类是一个抽象类，下面要介绍的是CheckBox、RadioButton、ToggleButton。

• activity_main.xml

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:paddingLeft="@dimen/activity_horizontal_margin"        android:paddingRight="@dimen/activity_horizontal_margin"        android:paddingTop="@dimen/activity_vertical_margin"        android:paddingBottom="@dimen/activity_vertical_margin"        android:orientation="vertical">        <Button            android:text="普通Button"            android:layout_width="fill_parent"            android:layout_height="wrap_content"/>        <TextView            android:text="性别RadioButton"            android:textSize="24sp"            android:textColor="#000000"            android:layout_width="fill_parent"            android:layout_height="wrap_content"/>        <RadioGroup            android:id="@+id/rg_sex"            android:layout_width="wrap_content"            android:layout_height="wrap_content">            <RadioButton                android:id="@+id/rb_male"                android:text="男"                android:checked="false"                android:layout_width="wrap_content"                android:layout_height="wrap_content" />            <RadioButton                android:id="@+id/rb_female"                android:text="女"                android:checked="true"                android:layout_width="wrap_content"                android:layout_height="wrap_content" />        </RadioGroup>        <TextView            android:text="爱好CheckBox"            android:textSize="24sp"            android:textColor="#000000"            android:layout_width="fill_parent"            android:layout_height="wrap_content"/>        <CheckBox            android:id="@+id/cb_basketball"            android:text="篮球"            android:layout_width="wrap_content"            android:layout_height="wrap_content"/>        <CheckBox            android:id="@+id/cb_football"            android:text="足球"            android:layout_width="wrap_content"            android:layout_height="wrap_content"/>        <CheckBox            android:id="@+id/cb_badminton"            android:text="羽毛球"            android:layout_width="wrap_content"            android:layout_height="wrap_content"/>        <TextView            android:text="开关ToggleButton"            android:textSize="24sp"            android:textColor="#000000"            android:layout_width="fill_parent"            android:layout_height="wrap_content"/>        <ToggleButton            android:id="@+id/tb_open_close"            android:checked="true"            android:textOff="开"            android:textOn="关"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout></ScrollView>

• MainActivity.java

package com.im.wu.compoundbuttonpractice;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;import android.widget.ToggleButton;public class MainActivity extends AppCompatActivity {    private RadioGroup rgSex = null;    private RadioButton rbFemale = null;    private RadioButton rbMale = null;    private CheckBox cbBasketball = null;    private CheckBox cbFootball = null;    private CheckBox cbBadminton = null;    private ToggleButton tbOpenClose = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initWidget();        rgSex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                if (checkedId == rbFemale.getId()) {                    Toast.makeText(MainActivity.this, "你的性别是：女", Toast.LENGTH_SHORT).show();                } else if (checkedId == rbMale.getId()) {                    Toast.makeText(MainActivity.this, "你的性别是：男", Toast.LENGTH_SHORT).show();                }            }        });        cbBasketball.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){            @Override            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                if(isChecked == true){                    Toast.makeText(MainActivity.this, "你的爱好有篮球！", Toast.LENGTH_SHORT).show();                }else{                    Toast.makeText(MainActivity.this, "你的爱好没有篮球！", Toast.LENGTH_SHORT).show();                }            }        });        cbFootball.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                if(isChecked == true){                    Toast.makeText(MainActivity.this, "你的爱好有足球！", Toast.LENGTH_SHORT).show();                }else{                    Toast.makeText(MainActivity.this, "你的爱好没有足球！", Toast.LENGTH_SHORT).show();                }            }        });        cbBadminton.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                if(isChecked == true){                    Toast.makeText(MainActivity.this, "你的爱好有羽毛球！", Toast.LENGTH_SHORT).show();                }else{                    Toast.makeText(MainActivity.this, "你的爱好没有羽毛球！", Toast.LENGTH_SHORT).show();                }            }        });        tbOpenClose.setOnCheckedChangeListener(new ToggleButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                if(isChecked == true){                    Toast.makeText(MainActivity.this, "已开灯！", Toast.LENGTH_SHORT).show();                }else{                    Toast.makeText(MainActivity.this, "已关灯！", Toast.LENGTH_SHORT).show();                }            }        });    }    public void initWidget(){        rgSex = (RadioGroup) findViewById(R.id.rg_sex);        rbFemale = (RadioButton) findViewById(R.id.rb_female);        rbMale = (RadioButton) findViewById(R.id.rb_male);        cbBasketball = (CheckBox) findViewById(R.id.cb_basketball);        cbBadminton = (CheckBox) findViewById(R.id.cb_badminton);        cbFootball = (CheckBox) findViewById(R.id.cb_football);        tbOpenClose = (ToggleButton) findViewById(R.id.tb_open_close);    }}

上面三种Button，还可以自定义形状加背景，下一篇文章详细讲解下自定义简单控件的思路。

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部分内容摘自（http://www.android100.org/html/201311/09/4725.html
Android开发CompoundButton）。

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