使用循环将按钮设置为onclicklistener [英] Using a loop to set the buttons onclicklistener

问题描述

我正在尝试使用循环来设置单击时每个按钮的动作(因为大多数按钮将仅返回其文本值)，但是我收到一条错误消息，指出从内部内部访问变量'i'类，则需要声明为最终的".我该如何解决?

I am trying to use a loop to set the action for each button when clicked (since most of the buttons will just return their text value), however I am getting an error stating "variable 'i' is accessed from within inner class, needs to be declared final". How can I get around this?

这就是我得到的

String getValuesPressed(){

    for(int i = 0; i < buttonList.length; i++){

        buttonList[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(i == 0){//error occurs here
                    //do stuff
                }

            }
        });
    }
    return textOnScreen;
}

推荐答案

您可以将i的值复制到临时最终变量中，例如-

You can copy the value of i in to a temp final variable as -

for (int i = 0; i < buttonList.length; i++) {
        final int finalI = i;
        buttonList[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (finalI == 0) {//error occurs here
                    //do stuff
                }
            }
        });
    }

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