复选框

（一）

1，布局

<?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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app5.MainActivity">

    <TextView android:layout_width="wrap_content"
        android:id="@+id/tv"
        android:layout_height="wrap_content"
        android:text="你的爱好是：" />
    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sing"
        android:text="唱歌"/>
    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/dance"
        android:text="跳舞"/>
    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/game"
        android:text="玩游戏"/>




</LinearLayout>

2，逻辑代码

package helloworld.com.inspur.app5;

import android.support.v4.widget.TextViewCompat;
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.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private TextView tv;
    private CheckBox cb1;
    private CheckBox cb2;
    private CheckBox cb3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView)findViewById(R.id.tv);
        cb1=(CheckBox)findViewById(R.id.sing);
        cb2=(CheckBox)findViewById(R.id.dance);
        cb3=(CheckBox)findViewById(R.id.game);
        cb1.setOnCheckedChangeListener(new MyListener());
        cb2.setOnCheckedChangeListener(new MyListener());
        cb3.setOnCheckedChangeListener(new MyListener());



    }
    class MyListener implements CompoundButton.OnCheckedChangeListener{
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            switch(buttonView.getId())
            {
                case R.id.sing:
                    Toast.makeText(MainActivity.this,"sing",Toast.LENGTH_SHORT).show();
                    break;
                case R.id.dance:
                    Toast.makeText(MainActivity.this,"dance",Toast.LENGTH_SHORT).show();
                    break;
                case R.id.game:
                    Toast.makeText(MainActivity.this,"game",Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    }
}

（3）if实现

（4）

布局

<?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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app5.MainActivity">

    <TextView android:layout_width="wrap_content"
        android:id="@+id/tv"
        android:layout_height="wrap_content"
        android:text="你的爱好是：" />
    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sing"
        android:text="唱歌"/>
    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/dance"
        android:text="跳舞"/>
    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/game"
        android:text="玩游戏"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but"
        android:text="提交"/>
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/tv_show"/>



</LinearLayout>

逻辑实现

package helloworld.com.inspur.app5;

import android.support.v4.widget.TextViewCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private TextView tv;
    private TextView tv_show;
    private CheckBox cb1;
    private CheckBox cb2;
    private CheckBox cb3;
    Button but;
    List<CheckBox> list;
    int count=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView)findViewById(R.id.tv);
        tv_show=(TextView)findViewById(R.id.tv_show);
        cb1=(CheckBox)findViewById(R.id.sing);
        cb2=(CheckBox)findViewById(R.id.dance);
        cb3=(CheckBox)findViewById(R.id.game);
        list=new ArrayList<>();
        but= (Button)findViewById(R.id.but);

        list.add(cb1);
        list.add(cb2);
        list.add(cb3);

        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringBuffer sb= new StringBuffer();
                for(CheckBox cb : list)
                {
                    if(cb.isChecked()) {
                        sb.append(cb.getText().toString());
                        count++;
                    }
                }
                if(sb!=null)
                {
                    Toast.makeText(MainActivity.this,sb+",共"+count+"项",Toast.LENGTH_SHORT ).show();
                    count=0;
                }
                else{
                    Toast.makeText(MainActivity.this,sb+",共"+count+"项",Toast.LENGTH_SHORT ).show();
                }
            }
        });

    }
    
}