Java Android：如何将参数从OnClickListener传递到另一个

我不熟悉android和Java。我想把一个变量（ac）从一个监听器传递到另一个监听器。我尝试过这种方法，但收到了以下错误：无法解析符号“ac”。你能帮我吗

Button Calculate = (Button) theLayout.findViewById(R.id.button);
Button buttonb = (Button) theLayout.findViewById(R.id.buttonb);
final TextView tvac = (TextView) theLayout.findViewById(R.id.tvac);
final TextView tvh = (TextView) theLayout.findViewById(R.id.tvh);
final EditText eta = (EditText) theLayout.findViewById(R.id.eta);
final EditText etn = (EditText) theLayout.findViewById(R.id.etn);
final EditText etb = (EditText) theLayout.findViewById(R.id.etb);

Calculate.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        Double a = new Double(eta.getText().toString());
        Double n = new Double(etn.getText().toString());
        Double ac = a*n;
        tvac.setText(getResources().getString(R.string.tvresultados2) + " " + ac);
    }
});
buttonb.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v) {
        double b = new Double(etb.getText().toString());
        double h = ac/b;          //error: cannot resolve symbol 'ac'
        tvh.setVisibility(View.VISIBLE);
        tvh.setText("h = " + h);
    }
});

---

最简单的方法是声明全局变量。将您的

ac

声明在onCreate范围之外，而不是在onCreate范围之内

public Double ac; // global variable

@Override
public void onCreate(Bundle savedInstanceState){

Button Calculate = (Button) theLayout.findViewById(R.id.button);
Button buttonb = (Button) theLayout.findViewById(R.id.buttonb);
final TextView tvac = (TextView) theLayout.findViewById(R.id.tvac);
final TextView tvh = (TextView) theLayout.findViewById(R.id.tvh);
final EditText eta = (EditText) theLayout.findViewById(R.id.eta);
final EditText etn = (EditText) theLayout.findViewById(R.id.etn);
final EditText etb = (EditText) theLayout.findViewById(R.id.etb);

Calculate.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        Double a = new Double(eta.getText().toString());
        Double n = new Double(etn.getText().toString());
        ac = a*n;
        tvac.setText(getResources().getString(R.string.tvresultados2) + " " + ac);
    }
});
buttonb.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v) {
        double b = new Double(etb.getText().toString());
        double h = ac;          //assign global variable into h
        tvh.setVisibility(View.VISIBLE);
        tvh.setText("h = " + h);
    }
});

}

---

这似乎是一个范围问题。尝试将

ac

声明移到

onClickListener

上方。我已经尝试了此选项，但要做到这一点，我需要将“ac”声明为最终值。然后将

ac

移到一个字段（全局）变量。这是java的基础。请阅读一些toturial fx：谢谢大家，它现在正在工作