如何禁用复选框，当达到在Android的限制？ [英] How to disable checkbox when a limit is reached in android?

问题描述

我有15 复选框，我一定要坚持用户，当他检查5个以上。我使用的方法 OnCheckedChangeListener 要知道，如果一个项目被选中，但我不知道如何选择后5项限制。

I have 15 CheckBox and I must to stuck user when he checks more than 5. I use the method OnCheckedChangeListener to know if an item is checked, but I don't know how to limit after 5 items selected.

请参阅我下面的code：

See my code below:

int lengthBox = 15;
int lenghtCount = 0;  

// inside onCreate method
final CheckBox[] checkbox = new CheckBox[lengthBox];
OnCheckedChangeListener checker = new OnCheckedChangeListener(){ 
    @Override
    public void onCheckedChanged(CompoundButton cb, boolean b) {
        // How can I improve this condition?
        if(checkbox[0].isChecked() || checkbox[1].isChecked() || 
        checkbox[2].isChecked() || checkbox[3].isChecked() || 
        checkbox[4].isChecked() || checkbox[5].isChecked() || 
        checkbox[6].isChecked() || checkbox[7].isChecked() || 
        checkbox[8].isChecked() || checkbox[9].isChecked() || 
        checkbox[10].isChecked() || checkbox[11].isChecked() || 
        checkbox[12].isChecked() || checkbox[13].isChecked() || 
        checkbox[14].isChecked()) {  
            if(lenghtCount < 5){
                lenghtCount++;
            }else{
                Toast.makeText(MyActivity.this, "Limit reached!!!", Toast.LENGTH_SHORT).show();
            }
        }
    }
};
for(int i = 0; i < lengthBox; i++) {
    int id = getResources().getIdentifier("checkbox_"+i, "id", getPackageName());
    checkbox[i] = (CheckBox) findViewById(id)
    checkbox[i].setOnCheckedChangeListener(checker);
}

有人点我在正确的道路，好吗？

Can someone point me in the right way, please?

更新：我想：

OnCheckedChangeListener checker = new OnCheckedChangeListener(){ 
    @Override
    public void onCheckedChanged(CompoundButton cb, boolean b) {
        if(lenghtCount == 5){
            cb.setChecked(false);
        }else if(b){
            lenghtCount++;
        }else if(!b){
            lenghtCount--;
        }
    }
};  

作品完美，但我觉得缺了点什么。当我点击5项工作的，但是当我取消选择他们后，我不能重新检查的项目。我缺少的是什么？

Works perfectly but I think something is missing. When I click 5 items this works, but after when I unselect them, I can't recheck any item. What I'm missing?

推荐答案

你应该使用其它变量计算checkboxs该检查的数量

you should use a other variable for counting number of checkboxs that checked

int count=0; 
OnCheckedChangeListener checker = new OnCheckedChangeListener(){ 
        @Override
        public void onCheckedChanged(CompoundButton cb, boolean b) {
           if(count == maxLimit && b)
               cb.setchecked(false);
               Toast.makeText(getApplicationContext(), 
            "Limit reached!!!", Toast.LENGTH_SHORT).show();
           }else if(b){

                count++;
                CharSequence myCheck = tagsCheck[i].getText();
                Toast.makeText(getApplicationContext(), 
                       myCheck + " checked!", 
                       Toast.LENGTH_SHORT)
                .show();
            }else if(!b){
 count--;
        }
    }; 

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