为checkBox设置事件监听，来判断有几个checkBox被选中
为七个checkbox设置事件监听，确保只能有三个checkbox被选中。下面是我写的代码，但是没达到效果，还请指点。main.java
程序代码：package com.example.lly.denglu;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android. android.widget.RadioButton;
import android.widget.Toast;
import java.lang.String;
public class Main3Activity extends AppCompatActivity {
private RadioButton nan=null;
private RadioButton nv=null;
private Button save=null;
private CheckBox ai1=null;
private CheckBox ai2=null;
private CheckBox ai3=null;
private CheckBox ai4=null;
private CheckBox ai5=null;
private CheckBox ai6=null;
private CheckBox ai7=null;
private int i1=0;
private int i2=0;
private int i3=0;
private int i4=0;
private int i5=0;
private int i6=0;
private int i7=0;
private int ii=0;
private String aihao0 = " ";
private String aihao1 = " ";
private String aihao2 = " ";
private String aihao3 = " ";
private String aihao4 = " ";
private String aihao5 = " ";
private String aihao6 = " ";
private String xingbie = " ";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
nan = (RadioButton) super.findViewById(R.id.radioButton1);
nv = (RadioButton) super.findViewById(R.id.radioButton2);
ai1 = (CheckBox) super.findViewById(R.id.checkBox1);
ai2 = (CheckBox) super.findViewById(R.id.checkBox2);
ai3 = (CheckBox) super.findViewById(R.id.checkBox3);
ai4 = (CheckBox) super.findViewById(R.id.checkBox4);
ai5 = (CheckBox) super.findViewById(R.id.checkBox5);
ai6 = (CheckBox) super.findViewById(R.id.checkBox6);
ai7 = (CheckBox) super.findViewById(R.id.checkBox7);
save = (Button) super.findViewById(R.id.button3);
save.setOnClickListener(new SaveOnClickListener());
ai1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao0 = ai1.getText().toString();i1=1;
}
else{
i1=0;
aihao0 ="";
}
}
});
ai2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao1 = ai2.getText().toString();i2=1;
}
else{
i2=0;
aihao0 ="";
}
}
});
ai3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao2 = ai3.getText().toString();i3=1;
}
else{
i3=0;
aihao0 ="";
}
}
});
ai4.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao3 = ai4.getText().toString();i4=1;
}
else{
i4=0;
aihao0 ="";
}
}
});
ai5.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao4 = ai5.getText().toString();i5=1;
}
else{
i5=0;
aihao0 ="";
}
}
});
ai6.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao5 = ai6.getText().toString();i6=1;
}
else{
i6=0;
aihao0 ="";
}
}
});
ai7.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
{
aihao6 = ai7.getText().toString();i7=1;
}
else{
i7=0;
aihao0 ="";
}
}
});
ii=i1+i2+i3+i4+i5+i6+i7;
}
private class SaveOnClickListener implements View.OnClickListener {
public void onClick(View v) {
if (nan.isChecked())
xingbie = nan.getText().toString();
if (nv.isChecked())
xingbie = nv.getText().toString();
if(ii != 3)
Toast.makeText(getApplicationContext(), "7选3哦！", Toast.LENGTH_LONG).show();
else {
String sInfo = "性别：" + xingbie + "*****爱好：" + aihao0 + aihao1 + aihao2 + aihao3 + aihao4 + aihao5 + aihao6;
Toast.makeText(getApplicationContext(), sInfo, Toast.LENGTH_LONG).show();
}
}
}
}
main3.xml
程序代码：<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas. xmlns:app="http://schemas. xmlns:tools="http://schemas. android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.lly.denglu.Main3Activity"
tools:layout_editor_absoluteY="81dp">
<Button
android:id="@+id/button3"
android:layout_width="88dp"
android:layout_height="49dp"
android:layout_marginBottom="159dp"
android:text="保存"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<CheckBox
android:id="@+id/checkBox3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="49dp"
android:text="篮球"
app:layout_constraintBaseline_toBaselineOf="@+id/checkBox2"
app:layout_constraintStart_toEndOf="@+id/checkBox2" />
<CheckBox
android:id="@+id/checkBox5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="43dp"
android:text="足球"
app:layout_constraintStart_toStartOf="@+id/checkBox2"
app:layout_constraintTop_toBottomOf="@+id/checkBox2" />
<CheckBox
android:id="@+id/checkBox7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:text="网球"
app:layout_constraintBaseline_toBaselineOf="@+id/checkBox6"
app:layout_constraintEnd_toEndOf="parent" />
<CheckBox
android:id="@+id/checkBox2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="7dp"
android:text="游泳"
app:layout_constraintStart_toEndOf="@+id/textView2"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<CheckBox
android:id="@+id/checkBox4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:text="健身"
app:layout_constraintBaseline_toBaselineOf="@+id/checkBox5"
app:layout_constraintStart_toStartOf="parent" />
<CheckBox
android:id="@+id/checkBox6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="43dp"
android:text="书法"
app:layout_constraintStart_toStartOf="@+id/checkBox3"
app:layout_constraintTop_toBottomOf="@+id/checkBox3" />
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="7dp"
android:text="象棋"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="80dp"
android:layout_height="64dp"
android:layout_marginBottom="30dp"
android:layout_marginStart="16dp"
android:layout_marginTop="36dp"
app:layout_constraintBottom_toTopOf="@+id/textView2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<RadioButton
android:id="@+id/radioButton2"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="女" />
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="65dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="男" />
</RadioGroup>
<TextView
android:id="@+id/textView2"
android:layout_width="0dp"
android:layout_height="43dp"
android:layout_marginEnd="3dp"
android:layout_marginTop="130dp"
android:text="7选3哦！"
app:layout_constraintEnd_toEndOf="@+id/radioGroup"
app:layout_constraintStart_toStartOf="@+id/checkBox1"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
