Android课程---视图组件之开关按钮

2022-11-27 18:31:05

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.hanqi.test5">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".UIActivity1">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".LongClickActivityActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".CalculatorActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity1" />

    </application>

</manifest>

当然每一次都少不了先注册，这个是绝对不能忘的，第二步就是写java代码了

package com.hanqi.test5;

import android.os.Bundle;

import android.support.annotation.IdRes;

import android.support.v7.app.AppCompatActivity;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import android.widget.ImageView;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.Switch;

import android.widget.Toast;

import android.widget.ToggleButton;

public class UIActivity1 extends AppCompatActivity {

    ImageView iv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_ui1);

        //单选框

        RadioGroup radioGroup = (RadioGroup)findViewById(R.id.rg);

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {

                if (checkedId == R.id.rb3) //rb3设定为正确答案

                {

                    Toast.makeText(UIActivity1.this, "选对了", Toast.LENGTH_LONG).show();

                }

                RadioButton rb = (RadioButton) findViewById(checkedId);

                Toast.makeText(UIActivity1.this, rb.getText(), Toast.LENGTH_LONG).show();

            }

        });

        //复选框

        CheckBox cb_st = (CheckBox)findViewById(R.id.cb_st);

        cb_st.setOnCheckedChangeListener(new CBOnCheckedChangListenter() {

            @Override

            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            }

        });

        cb_st.setOnCheckedChangeListener(new CBOnCheckedChangListenter());

        CheckBox cb_jc = (CheckBox)findViewById(R.id.cb_jc);

        cb_jc.setOnCheckedChangeListener(new CBOnCheckedChangListenter());

        CheckBox cb_xt = (CheckBox)findViewById(R.id.cb_xt);

        cb_xt.setOnCheckedChangeListener(new CBOnCheckedChangListenter());

        CheckBox cb_xhx = (CheckBox)findViewById(R.id.cb_xhx);

        cb_xhx.setOnCheckedChangeListener(new CBOnCheckedChangListenter());

        iv =(ImageView)findViewById(R.id.iv);

        ToggleButton tob =(ToggleButton)findViewById(R.id.tob);

        tob.setOnCheckedChangeListener(new TOnCheckedChangeListenter());

        Switch sw =(Switch)findViewById(R.id.sw);

        sw.setOnCheckedChangeListener(new TOnCheckedChangeListenter());

    }

    private class TOnCheckedChangeListenter implements CompoundButton.OnCheckedChangeListener{

        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            if (isChecked)

            {

                iv.setImageResource(R.drawable.on);

            }

            else

            {

                iv.setImageResource(R.drawable.off);

            }

        }

    }

    private class CBOnCheckedChangListenter implements CompoundButton.OnCheckedChangeListener

    {

    @Override

    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

        CheckBox cb = (CheckBox)buttonView;

        if (isChecked) {

            Toast.makeText(UIActivity1.this, "选中了" + cb.getText(), Toast.LENGTH_LONG).show();

        }

        else

        {

            Toast.makeText(UIActivity1.this, "取消了" + cb.getText(), Toast.LENGTH_LONG).show();

        }

    }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:padding="10dp"

    android:orientation="vertical"

    tools:context="com.hanqi.test5.UIActivity1">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="请选择Android的开发语言是什么？"/>

    <RadioGroup

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        android:id="@+id/rg">

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="C++"

            android:id="@+id/rb1"

            android:layout_marginRight="30dp"

            android:checked="true"/>

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="C"

            android:id="@+id/rb2"

            android:layout_marginRight="30dp"/>

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="JAVA"

            android:id="@+id/rb3"

            android:layout_marginRight="30dp"/>

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="C#"

            android:id="@+id/rb4" />

    </RadioGroup>

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="请选择字体效果"/>

    <CheckBox

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="宋体"

        android:id="@+id/cb_st"

        android:checked="true"/>

    <CheckBox

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="加粗"

        android:id="@+id/cb_jc" />

    <CheckBox

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="斜体"

        android:id="@+id/cb_xt" />

    <CheckBox

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="下划线"

        android:id="@+id/cb_xhx" />

    <ImageView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/off"

        android:id="@+id/iv"/>

    <ToggleButton

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textOn="打开"

        android:textOff="关闭"

        android:id="@+id/tob"/>

    <Switch

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="开关"

        android:textOff="关"

        android:textOn="开"

        android:id="@+id/sw"/>

    <ToggleButton

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textOn=""

        android:textOff=""

        android:background="@drawable/mybutton"

        android:id="@+id/tob1"/>

</LinearLayout>

特别注意，怎么能让按钮不显示字体，用两张背景图来显示效果呢？这就要用到一段xml代码了，******** 这一段代码的名字一定要全部小写

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/on" android:state_checked="true"/>

    <item android:drawable="@drawable/off" android:state_checked="false"/>

</selector>

实现效果：

码农公寓

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