计算金额时出错，三个字段名称、数量、价格，其中名称和价格从第一个活动和数量编辑文本中获取，允许用户输入数量，但出现错误：-
最终局部变量 qty、价格、总计无法分配因为它是在封闭类型 android 中定义的。请参阅源代码
public class SecondScreenActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screen2);
TextView txtName = (TextView) findViewById(R.id.txtName);
final TextView txtCost = (TextView) findViewById(R.id.txtCost);
final EditText txtQty=(EditText)findViewById(R.id.txtQty);
final double price = Double.parseDouble(txtCost.getText().toString());
final double qty = Double.parseDouble(txtQty.getText().toString());
final double total=0;
Button btnClose = (Button) findViewById(R.id.btnCalculate);
final TextView txtResult = (TextView) findViewById(R.id.txtResult);
Intent i = getIntent();
// Receiving the Data
String name = i.getStringExtra("name");
String cost = i.getStringExtra("cost");
// Displaying Received data
txtName.setText(name);
txtCost.setText(cost);
// Binding Click event to Button
btnClose.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
//Closing SecondScreen Activity
//finish();
//Getting Error Here
//the final local variable qty price total
//cannot be assigned since it is defined
//in an enclosing type android
qty=Double.parseDouble(txtQty.getText().toString());
price=Double.parseDouble(txtCost.getText().toString());
total=qty*price;
txtResult.setText(Double.toString(total));
}
});
}
}