当我访问其中的变量时OnClickListener
,显示错误。
这是一个代码:
EditText hight=(EditText)findViewById(R.id.hight);
EditText wight=(EditText)findViewById(R.id.wight);
Button calc=(Button) findViewById(R.id.calculate);
TextView result=(TextView) findViewById(R.id.result);
calc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Double h=Double.valueOf(hight.getText().toString());
Double w=Double.valueOf(wight.getText().toString());
h=h/100;
试试这个:
final EditText hight,wight;
final Button calc;
final TextView result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
hight=(EditText)findViewById(R.id.hight);
wight=(EditText)findViewById(R.id.wight);
calc=(Button) findViewById(R.id.calculate);
result=(TextView) findViewById(R.id.result);
calc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Double h=Double.valueOf(hight.getText().toString());
Double w=Double.valueOf(wight.getText().toString());
h=h/100;
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