Question

我正在做一个关于计算购物清单中的钱的小程序。我有一个问题，告诉我选择的确切CheckBox。该计划如下：

我的布局： https://www.dropbox.com/s/mne4u3va94svx8y/%E6%93%B7%E5%8F%96.JPG?dl=0

我的“activity_main.xml”

<RelativeLayout 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"
    tools:context="${relativePackage}.${activityClass}" >

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Choose the ingredients that you need" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <CheckBox
                android:id="@+id/check_milk"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Milk 80 $        " />

            <CheckBox
                android:id="@+id/check_rice"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Rice 240 $" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <ImageView
                android:id="@+id/image_milk"
                android:layout_width="122dp"
                android:layout_height="match_parent"
                android:src="@drawable/milk" />

            <ImageView
                android:id="@+id/image_rice"
                android:layout_width="106dp"
                android:layout_height="50dp"
                android:layout_weight="0.40"
                android:src="@drawable/rice" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <CheckBox
                android:id="@+id/check_sausage"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Sausage 50 $" />

            <CheckBox
                android:id="@+id/check_chicken"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Chicken 350 $" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <ImageView
                android:id="@+id/image_sausage"
                android:layout_width="87dp"
                android:layout_height="47dp"
                android:src="@drawable/sausage" />

            <ImageView
                android:id="@+id/image_chicken"
                android:layout_width="162dp"
                android:layout_height="43dp"
                android:layout_weight="0.27"
                android:src="@drawable/chicken" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <CheckBox
                android:id="@+id/check_rice_ball"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Rice Ball 50 $" />

            <CheckBox
                android:id="@+id/check_fish"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Fish 250 $" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <ImageView
                android:id="@+id/image_rice_ball"
                android:layout_width="113dp"
                android:layout_height="39dp"
                android:src="@drawable/rice_ball" />

            <ImageView
                android:id="@+id/image_fish"
                android:layout_width="192dp"
                android:layout_height="match_parent"
                android:src="@drawable/fish" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <Button
                android:id="@+id/button_buy"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:onClick="buy"
                android:text="Button" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <ImageView
                android:id="@+id/image_Milk"
                android:layout_width="45dp"
                android:layout_height="30dp"
                android:src="@drawable/milk"
                android:visibility="gone" />

            <ImageView
                android:id="@+id/image_Rice"
                android:layout_width="56dp"
                android:layout_height="30dp"
                android:src="@drawable/rice"
                android:visibility="gone" />

            <ImageView
                android:id="@+id/image_Sausage"
                android:layout_width="56dp"
                android:layout_height="30dp"
                android:src="@drawable/sausage"
                android:visibility="gone" />

            <ImageView
                android:id="@+id/image_Chicken"
                android:layout_width="56dp"
                android:layout_height="30dp"
                android:src="@drawable/chicken"
                android:visibility="gone" />

            <ImageView
                android:id="@+id/image_Rice_Ball"
                android:layout_width="56dp"
                android:layout_height="30dp"
                android:src="@drawable/rice_ball"
                android:visibility="gone" />

            <ImageView
                android:id="@+id/image_Fish"
                android:layout_width="56dp"
                android:layout_height="30dp"
                android:src="@drawable/fish"
                android:visibility="gone" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <ScrollView
                android:id="@+id/scroresult"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" >

                <TextView
                    android:id="@+id/show_result"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:hint="Result"
                    android:textAppearance="?android:attr/textAppearanceMedium" />

            </ScrollView>
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>

我的MainActivity_market.java

package com.example.market_shop_3;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;

public class MainActivity_market extends Activity 
 implements OnCheckedChangeListener
{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity_market);
        //program start here
        int[] id={R.id.check_milk, R.id.check_rice,R.id.check_sausage,R.id.check_chicken
        		,R.id.check_rice_ball,R.id.check_fish};
      for(int i:id) //loop for importand recoder listener
      {
    	  ((CheckBox)findViewById(i)).setOnCheckedChangeListener(this);
      }
        		
        
    }
    

    
    public void buy(View v)
    {
    	String show_buy="";
    //	String total_prices="";
    	String test="";
    	int count=0;
    	
    	
    	CheckBox check;
    	int[] id={R.id.check_milk, R.id.check_rice,R.id.check_sausage,R.id.check_chicken
        		,R.id.check_rice_ball,R.id.check_fish};
    	for(int i:id)
    	{
    		check=(CheckBox)findViewById(i);
    		if(check.isChecked())
    		{
    			show_buy+="\n"+check.getText();
    			
    			
    			if (check.getText()=="milk 80 $" )
    				count = count +80;
    			else if (check.getText()=="Rice 240 $")
    				count = count +240;
    			else if (check.getText()=="Sausage 50 $")
    				count = count +50;
    			else if (check.getText()=="Chicken 350 $")
    				count = count +350;
    			else if (check.getText()=="Rice Ball 50 $")
    				count = count +50;
    			else if (check.getText()=="Fish 250 $")
    				count = count +250;
    				
    		}
    	}
    	int total = count;
    	
    	if(show_buy.length()>0)
    	{
    		show_buy ="Your shopping list: "+show_buy +"\n"+"Total expenses: "+ total;
    	//	total_prices="Total expenses ($): "+ ;
    	}
    	else
    		show_buy="Please pick the ingredients that you need.";
    TextView show_result=(TextView)findViewById(R.id.show_result);
    show_result.setText(show_buy);
    }

    //設ArrayList儲存已選項目的集合物件
    ArrayList<CompoundButton> selected = new ArrayList<CompoundButton>();
    
	@Override
	public void onCheckedChanged(CompoundButton id, boolean isChecked)
	{   
		if (isChecked==true)   //若項目被選取
			selected.add(id);  //加到集合中
		else                   //若項目被取消
			selected.remove(id); //自集合中移除
		
		
		// TODO Auto-generated method stub
		int visible;
		if(isChecked){ //CHECKED
			visible=View.VISIBLE; //SET PICTURE IS VISIBLE
			}
		else{   //CANCEL CHECKED
			visible=View.GONE; //SET PICTURE IS NOT VISIBLE
		}
		switch (id.getId()){
		case R.id.check_milk:
			findViewById(R.id.image_Milk).setVisibility(visible);
			break;
		case R.id.check_rice:
			findViewById(R.id.image_Rice).setVisibility(visible);
			break;
		case R.id.check_sausage:
			findViewById(R.id.image_Sausage).setVisibility(visible);
			break;
		case R.id.check_chicken:
			findViewById(R.id.image_Chicken).setVisibility(visible);
			break;
		case R.id.check_rice_ball:
			findViewById(R.id.image_Rice_Ball).setVisibility(visible);
			break;
		case R.id.check_fish:
			findViewById(R.id.image_Fish).setVisibility(visible);	
			break;
		}
		
		
	}
}

在java部分中，

我不是怎么告诉我选择的CheckBox，我使用了if-elseif条件（check.getText（）==“milk 80 $”;否则if（check.getText（）==“Rice 240 $” ）....）判断我应该为总费用添加多少钱

我设置一个名为“count”的“int”来累积我的总费用，但似乎没有用。

失败结果： https://www.dropbox.com/s/fwj329jg0sj0ypd/1.JPG?dl=0

“总费用：0”应为“总费用：670”。

Answer 1

为每个复选框（购物项目）的ID-PRICE创建一个2D数组

int[] id_price={
{R.id.check_milk,80}, 
{R.id.check_rice,240},
{R.id.check_sausage,50},
{R.id.check_chicken,350},
{R.id.check_rice_ball,50},
{R.id.check_fish}, 250};

单击按钮上的

（计算所有选定列表）或选中或取消选中每个项目（复选框）：

CheckBox check = null;
int total = 0;
for(int i=0;i<id_price.length;i++){
    check=(CheckBox)findViewById(id_price[i][0]);
    if(check.isChecked()){
        total += id_price[i][1];//add item price to total
    }else{
        total -= id_price[i][1];//subtract item price from total
    }
}//for all check boxes
//now you have total ready for your next step ...

这种方式不需要IF statement

如何从Eclipse Android中的每个CheckBox获取信息

1 个答案: