Question

我需要计算按钮上的点击次数并在TOAST上显示，当我尝试使用Android VM进行循环时

 final Button button= (Button) findViewById(R.id.button1);
    button.setOnClickListener(new View.OnClickListener() {
        int contadorClicks =0;
        public void onClick(View v) {
            //definir accion

            contadorClicks ++ ;

           Toast.makeText(getApplicationContext(), contadorClicks, Toast.LENGTH_LONG).show();
        }
    });

Answer 1

尝试： create int contadorClicks = 0;类中的字段，即活动或片段然后在方法内使用

 final Button button= (Button) findViewById(R.id.button1);
 button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        //definir accion
        contadorClicks ++ ;
       Toast.makeText(getApplicationContext(), String.valueOf(contadorClicks), Toast.LENGTH_LONG).show();
    }
});

或者您可以执行以下操作：

final Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            //definir accion
            Integer contadorClicks;
            if (v.getTag() == null) {
                contadorClicks = 0;
            } else {
                contadorClicks = (Integer) v.getTag();
            }
            contadorClicks++;
            v.setTag(contadorClicks);

            Toast.makeText(getApplicationContext(), String.valueOf(contadorClicks), Toast.LENGTH_LONG).show();
        }
    });

Answer 2

您需要定义要在setOnClickListener方法之外增加的变量。另外，正如我之前所建议的那样，使用String.valueOf（contadorClicks）获取int的String represantation。

int contadorClicks = 0;    

final Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {
        //definir accion

        contadorClicks++;

       Toast.makeText(getApplicationContext(), String.valueOf(contadorClicks), Toast.LENGTH_LONG).show();
    }
});

Answer 3

发生的事情是你的变量contadorClicks总是为0，因为每次点击按钮都会创建它。您需要做的是将该变量放在onClickListener之外。希望这有帮助

int contadorClicks = 0;
final Button button= (Button) findViewById(R.id.button1);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            //definir accion

            contadorClicks ++ ;

           Toast.makeText(getApplicationContext(), contadorClicks, Toast.LENGTH_LONG).show();
        }
    });

如何计算点击和显示Toast

3 个答案: