如何将数字小数（###，###，###.00）放入字符串值

Question

大家好，我希望我的号码（结果）看起来像这样 ###,###,###.00。从以下 Java 代码的以下短语进入 String.valueOf 中的（结果）。感谢您的回答。 result.setText("租金为" + String.valueOf(resultat) + "currency");

package albencreation.realestateapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Rent extends AppCompatActivity {

    EditText price = null;
    EditText profit = null;
    TextView result = null;
    Button envoyer = null;
    Button close = null;
    Button info = null;
    Button clear = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rent);

        price = (EditText) findViewById(R.id.price);
        profit = (EditText) findViewById(R.id.profit);
        result = (TextView) findViewById(R.id.result);
        envoyer = (Button) findViewById(R.id.buttcalculate);
        close = (Button) findViewById(R.id.buttclose);
        info = (Button) findViewById(R.id.buttinfo);
        clear = (Button) findViewById(R.id.buttclear);

        envoyer.setOnClickListener(envoyerListener);
        close.setOnClickListener(closeListener);
        info.setOnClickListener(infoListener);
        clear.setOnClickListener(clearListener);
    }

    private OnClickListener envoyerListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            String p = price.getText().toString();
            String o = profit.getText().toString();

            float pValue;
            if (p.isEmpty()) {
                pValue = 0;
            } else {
                pValue = Float.valueOf(p);
            }
            float oValue;
            if (o.isEmpty()) {
                oValue = 0;
            } else {
                oValue = Float.valueOf(o);
            }

            float resultat = oValue * pValue / 100;
            result.setText("the rent is " + String.valueOf(resultat) + " currency");
        }
    };

    private OnClickListener closeListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent jumpage = new Intent(Rent.this, MainActivity.class);
            startActivity(jumpage);
        }
    };

    private OnClickListener infoListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent jumpage = new Intent(Rent.this, Inforent.class);
            startActivity(jumpage);
        }
    };

    private OnClickListener clearListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            price.getText().clear();
            profit.getText().clear();
            String defaut = "result rent";
            result.setText(defaut);
        }
    };

}

Answer 1

根据需要使用DecimalFormat 格式化string。对于整数值使用#，对于小数位使用0

DecimalFormat formatter = new DecimalFormat("###,###,###.00");
String resultString = formatter.format(resultat);

result.setText("the rent is " + resultString + " currency");

Answer 2

试试这个：

import java.text.DecimalFormat;
float f = YourValue;
DecimalFormat decimalFormat = new DecimalFormat("#.##");
float twoDigitsF = Float.valueOf(decimalFormat.format(f));

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