android控件06---CheckBox

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:text="下面哪些是android里的控件？"/>
    <CheckBox
        android:id="@+id/box1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/text"
        android:text="Button"/>
    <CheckBox
        android:id="@+id/box2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="RadioButton"
        android:layout_below="@+id/box1"
        android:layout_alignParentStart="true" />
    <CheckBox
        android:id="@+id/box3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CheckBox"
        android:layout_below="@+id/box2"
        android:layout_alignParentStart="true" />
    <CheckBox
        android:id="@+id/box4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android"
        android:layout_below="@+id/box3"
        android:layout_alignParentStart="true" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/box4"
        android:layout_centerHorizontal="true"
        android:text="提交"/>
</RelativeLayout>

Activity代码如下：

package xy.kj;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private TextView text;
    private CheckBox box1;
    private CheckBox box2;
    private CheckBox box3;
    private CheckBox box4;
    private Button button;
    private String str1 = null,str2= null,str3 = null,str4 = null;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text = (TextView)findViewById(R.id.text);
        box1 = (CheckBox)findViewById(R.id.box1);
        box2 = (CheckBox)findViewById(R.id.box2);
        box3 = (CheckBox)findViewById(R.id.box3);
        box4 = (CheckBox)findViewById(R.id.box4);
        button = (Button)findViewById(R.id.button);
        //对每个选项设置监听事件
        box1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (box1.isChecked()){
                    Toast toast = Toast.makeText(MainActivity.this,"你选择了："+box1.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }else{
                    Toast toast = Toast.makeText(MainActivity.this,"你取消了选择："+box1.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }
            }
        });
        box2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (box2.isChecked()){
                    Toast toast = Toast.makeText(MainActivity.this,"你选择了："+box2.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }else{
                    Toast toast = Toast.makeText(MainActivity.this,"你取消了选择："+box2.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }
            }
        });
        box3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (box3.isChecked()){
                    Toast toast = Toast.makeText(MainActivity.this,"你选择了："+box3.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }else{
                    Toast toast = Toast.makeText(MainActivity.this,"你取消了选择："+box3.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }
            }
        });
        box4.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (box4.isChecked()){
                    Toast toast = Toast.makeText(MainActivity.this,"你选择了："+ box4.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }else{
                    Toast toast = Toast.makeText(MainActivity.this,"你取消了选择："+box4.getText(),Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.TOP,0,500);
                    toast.show();
                }
            }
        });

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String str = null;
                if (box1.isChecked() && box2.isChecked() && box3.isChecked()){
                    str = "回答正确！";
                }else{
                    str = "回答错误!";
                }

                Toast toast = Toast.makeText(MainActivity.this,str,Toast.LENGTH_LONG);
                toast.setGravity(Gravity.TOP,0,500);
                toast.show();
            }
        });
    }
}