Android学习笔记17---单选按钮&复选框

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单选按钮，RadioGroup通常和RadioButton配合起来使用。

常见的选性别操作。用一下两种方式实现。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.amy.radiogrouptest.MainActivity">    <LinearLayout        android:orientation="horizontal"        android:layout_width="wrap_content"        android:layout_height="wrap_content">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="性别："            android:height="50px"/>        <RadioGroup            android:id="@+id/radioGroup1"            android:orientation="horizontal"            android:layout_width="wrap_content"            android:layout_height="wrap_content">            <RadioButton                android:id="@+id/radio0"                android:text="男"                android:checked="true"                android:layout_width="wrap_content"                android:layout_height="wrap_content" />            <RadioButton                android:id="@+id/radio1"                android:text="女"                android:layout_width="wrap_content"                android:layout_height="wrap_content" />        </RadioGroup>        <Button            android:id="@+id/button1"            android:text="提交"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout></android.support.constraint.ConstraintLayout>

MainActivity.java

package com.amy.radiogrouptest;import android.provider.MediaStore;import android.support.annotation.IdRes;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.RadioButton;import android.widget.RadioGroup;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        /**         *方式一：在选择单选按钮时获取值         */        //获取单选按钮组        final RadioGroup sex = (RadioGroup) findViewById(R.id.radioGroup1);        sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {                //获取被选择的单选按钮                RadioButton r = (RadioButton) findViewById(checkedId);                Log.e("单选按钮","您选择的是"+r.getText());            }        });        /**         * 方式二：在单击“提交”按钮时获取         */        //获取提交按钮        Button button = (Button) findViewById(R.id.button1);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //通过for循环遍历单击按钮组                for (int i=0;i<sex.getChildCount();i++) {                    RadioButton r = (RadioButton) sex.getChildAt(i);                    //判断单选按钮是否被选中                    if (r.isChecked()) {                        Log.e("单选按钮","性别："+r.getText());                        break;                    }                }            }        });    }}

效果图：

复选框，在选项前面默认显示成一个小方块，与单选按钮不同的是，它为每一个复选框都提供一个选中和不选中两种状态。

主要应用在选爱好，课程，购物车里面的种种。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.amy.checkbox.MainActivity">    <LinearLayout        android:orientation="horizontal"        android:layout_width="368dp"        android:layout_height="wrap_content"        tools:layout_editor_absoluteY="0dp"        tools:layout_editor_absoluteX="8dp">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="爱好"            android:textSize="16sp"            android:width="100px"            android:gravity="right"            android:height="50px"/>        <CheckBox            android:id="@+id/like1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="Java" />        <CheckBox            android:id="@+id/like2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="C++" />        <CheckBox            android:id="@+id/like3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="Python" />        <Button            android:id="@+id/button1"            android:text="提交"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout></android.support.constraint.ConstraintLayout>

MainActivity.java

package com.amy.checkbox;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private Button button;    private CompoundButton.OnCheckedChangeListener onCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {        @Override        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {            if (isChecked) {                //判断复选框是否被选中                Log.e("复选框","选中了["+buttonView.getText().toString()+"]");            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final CheckBox like1 = (CheckBox) findViewById(R.id.like1);        final CheckBox like2 = (CheckBox) findViewById(R.id.like2);        final CheckBox like3 = (CheckBox) findViewById(R.id.like3);        //为三个复选框添加状态改变监听器        like1.setOnCheckedChangeListener(onCheckedChangeListener);        like2.setOnCheckedChangeListener(onCheckedChangeListener);        like3.setOnCheckedChangeListener(onCheckedChangeListener);        //获取提交按钮，并为其添加单击事件监听        button = (Button) findViewById(R.id.button1);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String likes = "";                if (like1.isChecked())likes += like1.getText().toString()+" ";                if (like2.isChecked())likes += like2.getText().toString()+" ";                if (like3.isChecked())likes += like3.getText().toString()+" ";                //显示被选中的内容                Toast.makeText(MainActivity.this,likes,Toast.LENGTH_SHORT).show();            }        });    }}

效果图：

这部分比较简单，肯能是还没有到难得时候，暗自开心一会。毕竟幸福的日子总是那么短暂

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