Android studio货币转换器编码

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.DecimalFormat;

public class MainActivity extends AppCompatActivity {

    private EditText etAmount;
    private Button btnConvert;
    private TextView tvResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etAmount = findViewById(R.id.et_amount);
        btnConvert = findViewById(R.id.btn_convert);
        tvResult = findViewById(R.id.tv_result);

        btnConvert.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                convertCurrency();
            }
        });
    }

    private void convertCurrency() {
        double amount = Double.parseDouble(etAmount.getText().toString());
        double convertedAmount = amount * 0.85; // 假设将美元转换为欧元，汇率为0.85
        DecimalFormat decimalFormat = new DecimalFormat("#.##");
        String result = decimalFormat.format(convertedAmount);
        tvResult.setText(result);
    }
}