Question

如何在我的Java代码中插入DecimalFormat。我希望我的价值（结果）像###，###，###。00。（resultat）在result.setText中（＆＃34;租金是＆＃34; + String.valueOf（resultat）+＆＃34;货币＆＃34;）;我尝试了几个DecimalFormat但没有效果，因为我可能没有正确插入String中的decimalFormat。谢谢你给我看。

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);
            Rent.this.finish();
        }
    };

    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

result.setText("the rent is " + new DecimalFormat("###,###,###.00").format(resultat) + " currency");

我的100,000,000.32值为100000000.32

Answer 2

带有模式字符串的DecimalFormat格式化属性。

DecimalFormat myFormatter = new DecimalFormat("###,###,###.00");
float resultat = oValue * pValue / 100;
result.setText("the rent is " + myFormatter.format(resultat ) + " currency");

这通过将模式String传递给DecimalFormat构造函数来创建格式化程序。 format方法接受double值作为参数，并在String中返回格式化的数字。

Answer 3

添加额外的"###,"是多余的，###,###.00将完成这项工作。

DecimalFormat formatter = new DecimalFormat("###,###.00");

如何在我的Java代码中插入DecimalFormat

3 个答案: