Android 復(fù)選框示例

Android CheckBox 是一種具有兩種狀態(tài)（選中或未選中）的按鈕。愛掏網(wǎng) - it200.com

復(fù)選框的用途可以很多。愛掏網(wǎng) - it200.com例如，可以用來了解用戶的興趣愛好，激活/關(guān)閉特定的操作等。愛掏網(wǎng) - it200.com

Android CheckBox類是CompoundButton類的子類。愛掏網(wǎng) - it200.com

android.widget.CheckBox類提供了創(chuàng)建復(fù)選框的功能。愛掏網(wǎng) - it200.com

CheckBox類的方法

CheckBox類繼承了View、TextView和Button類的許多方法。愛掏網(wǎng) - it200.com其中一些如下：

Android CheckBox 示例

activity_main.xml

將三個復(fù)選框和一個按鈕拖到布局中。愛掏網(wǎng) - it200.com現(xiàn)在，activity_main.xml 文件將如下所示：

<?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="example.javatpoint.com.checkbox.MainActivity">  


    <CheckBox  
        android:id="@+id/checkBox"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="144dp"  
        android:layout_marginTop="68dp"  
        android:text="Pizza"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toTopOf="parent" />  

    <CheckBox  
        android:id="@+id/checkBox2"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="144dp"  
        android:layout_marginTop="28dp"  
        android:text="Coffee"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toBottomOf="@+id/checkBox" />  

    <CheckBox  
        android:id="@+id/checkBox3"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="144dp"  
        android:layout_marginTop="28dp"  
        android:text="Burger"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toBottomOf="@+id/checkBox2" />  

    <Button  
        android:id="@+id/button"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="144dp"  
        android:layout_marginTop="184dp"  
        android:text="Order"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toBottomOf="@+id/checkBox3" />  

</android.support.constraint.ConstraintLayout>  

Activity類

讓我們編寫代碼來檢查哪個切換按鈕是打開/關(guān)閉的。愛掏網(wǎng) - it200.com

package example.javatpoint.com.checkbox;

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.Toast;

public class MainActivity extends AppCompatActivity {
    CheckBox pizza,coffe,burger;
    Button buttonOrder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        addListenerOnButtonClick();
    }
    public void addListenerOnButtonClick(){
        //Getting instance of CheckBoxes and Button from the activty_main.xml file
        pizza=(CheckBox)findViewById(R.id.checkBox);
        coffe=(CheckBox)findViewById(R.id.checkBox2);
        burger=(CheckBox)findViewById(R.id.checkBox3);
        buttonOrder=(Button)findViewById(R.id.button);

        //Applying the Listener on the Button click
        buttonOrder.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View view) {
                int totalamount=0;
                StringBuilder result=new StringBuilder();
                result.append("Selected Items:");
                if(pizza.isChecked()){
                    result.append("\nPizza 100Rs");
                    totalamount+=100;
                }
                if(coffe.isChecked()){
                    result.append("\nCoffe 50Rs");
                    totalamount+=50;
                }
                if(burger.isChecked()){
                    result.append("\nBurger 120Rs");
                    totalamount+=120;
                }
                result.append("\nTotal: "+totalamount+"Rs");
                //Displaying the message on the toast
                Toast.makeText(getApplicationContext(), result.toString(), Toast.LENGTH_LONG).show();
            }

        });
    }
}

輸出：